侧滑+fragment切换页面+fragment嵌套+二次采样+轮播图+gridview展示图片+网络请求数据+数据库

全局配置Appliction
所需要的依赖有：implementation ‘com.google.code.gson:gson:2.8.5’
implementation ‘com.nostra13.universalimageloader:universal-image-loader:1.9.5’
implementation ‘com.android.support:design:28.0.0’
implementation project(’:library’)

package com.example.week_03_02;

import android.app.Application;

import com.nostra13.universalimageloader.core.DisplayImageOptions;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;

public class App extends Application {
    @Override
    public void onCreate() {
        super.onCreate();

        ImageLoader.getInstance().init(
                new ImageLoaderConfiguration.Builder(this)
                        .diskCacheSize(50*1024*1024)
                        .memoryCacheSizePercentage(10)
                        .defaultDisplayImageOptions(
                                new DisplayImageOptions.Builder()
                                        .cacheInMemory(true)
                                        .cacheOnDisk(true)
                                        .showImageOnFail(R.mipmap.ic_launcher)
                                        .showImageOnLoading(R.mipmap.ic_launcher)
                                        .showImageForEmptyUri(R.mipmap.ic_launcher)
                                        .build()
                        )
                        .build()
        );
    }
}

Activity基类`

package com.example.week_03_02;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;

public abstract class BaseActivty extends AppCompatActivity {
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(getLayoutResId());
        //初始化
        initView(savedInstanceState);
        //添加数据
        initData();
    }

    protected abstract void initData();


    protected abstract void initView(Bundle savedInstanceState);


    protected abstract int getLayoutResId();
}

Activity：首页展示切换页面的fragment+侧滑ddrawerLayout

package com.example.week_03_02;

import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.MenuItem;

import com.example.adapter.HomePageAdapter;
import com.example.feagment.LeftFragment;

public class MainActivity extends BaseActivty {
    private DrawerLayout drawerLayout;
    private TabLayout tabLayout;
    private ViewPager viewPager;
    private ActionBarDrawerToggle toggle;

    @Override
    protected void initData() {
    }

    @Override
    protected void initView(Bundle savedInstanceState) {
        drawerLayout=findViewById(R.id.drawerlayout);
        tabLayout=findViewById(R.id.tablayout);
        viewPager=findViewById(R.id.viewpager);
        //绑定适配器
        viewPager.setAdapter(new HomePageAdapter(getSupportFragmentManager()));
        //tablayout绑定fragment
        tabLayout.setupWithViewPager(viewPager);
        //允许侧拉左上角按钮
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        toggle=new ActionBarDrawerToggle(this,drawerLayout,R.string.open,R.string.close);
        toggle.syncState();
        drawerLayout.addDrawerListener(toggle);
        //创建侧滑界面
        if (savedInstanceState==null){
            getSupportFragmentManager().beginTransaction()
                    .add(R.id.framelayout,new LeftFragment())
                    .commit();
        }
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (toggle.onOptionsItemSelected(item)){
            return true;
        }
        return super.onOptionsItemSelected(item);
    }
    @Override
    protected int getLayoutResId() {
        return R.layout.activity_main;
    }
    //切换页面的方法
    public void showPage(int position){
        viewPager.setCurrentItem(position);
        drawerLayout.closeDrawer(Gravity.START);
    }

}

对应的切换页面的适配器HomePageAdapter

package com.example.adapter;

import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;


import com.example.feagment.HomeFragment;
import com.example.feagment.MyFragment;
import com.example.feagment.VideoFragment;

public class HomePageAdapter extends FragmentPagerAdapter {
    private String[] meuns = new String[]{"首页","视频","我的"};

    public HomePageAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int i) {
        switch (i){
            case 0:
                return new HomeFragment();
            case 1:
                return new VideoFragment();
            case 2:
                return new MyFragment();
        }
        return null;
    }

    @Override
    public int getCount() {
        return meuns.length;
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return meuns[position];
    }
}

activity所对应的布局activity_main布局文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.DrawerLayout android:id="@+id/drawerlayout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"

    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    //主界面
        <android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

            xmlns:tools="http://schemas.android.com/tools"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            tools:context=".MainActivity">
            <android.support.v4.view.ViewPager
                android:id="@+id/viewpager"
                android:layout_width="0dp"
                android:layout_height="0dp"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintTop_toTopOf="parent"
                app:layout_constraintBottom_toTopOf="@id/tablayout"/>
            <!--支持taglayout滑动的属性：app:tabMode="scrollable"-->
            <android.support.design.widget.TabLayout
                android:id="@+id/tablayout"
                android:layout_width="0dp"
                android:layout_height="wrap_content"
                app:tabSelectedTextColor="#f00"
                app:tabTextColor="#ccc"
                app:tabBackground="@color/colorPrimary"
                app:tabIndicatorColor="@android:color/transparent"
                app:layout_constraintLeft_toLeftOf="parent"
                app:layout_constraintRight_toRightOf="parent"
                app:layout_constraintBottom_toBottomOf="parent"
                app:layout_constraintTop_toBottomOf="@id/viewpager"/>

        </android.support.constraint.ConstraintLayout>
    <!--侧拉界面-->
    <FrameLayout
        android:id="@+id/framelayout"
        android:layout_width="200dp"
        android:layout_height="match_parent"
        android:background="#fff"
        android:layout_gravity="start"
        />
</android.support.v4.widget.DrawerLayout>

Fragment所对应的基类BaseFragment

package com.example.feagment;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;

public abstract class BaseFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        if (getLayoutResId()!=0) {
            return inflater.inflate(getLayoutResId(), container, false);
        }
        View view = getLayoutView();
        if (view!=null){
            return view;
        }
        return null;
    }

    protected int getLayoutResId() {
        return 0;
    }

    protected View getLayoutView() {
        return null;
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        //初始化
        initView(view);
        //添加数据
        initData();
    }

    protected abstract void initData();

    protected abstract void initView(View view);
    
}

侧滑对应的LeftFragment：其中有listview多条目展示图片和文字，以及图片的二次采样展示头像图片

package com.example.feagment;


import android.content.Intent;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.net.Uri;
import android.provider.MediaStore;
import android.support.v4.content.CursorLoader;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.MediaController;

import com.example.adapter.LeftBaseAdapter;
import com.example.utils.NetUtils;
import com.example.week_03_02.MainActivity;
import com.example.week_03_02.R;



public class LeftFragment extends BaseFragment{
    private ListView listView;
    private LeftBaseAdapter leftBaseAdapter;
    private final int REQUEST_SECCESS=100;

    @Override
    protected void initData() {

    }

    @Override
    protected void initView(View view) {
        //获取资源id
             listView=view.findViewById(R.id.listview);
         //创建适配器
        leftBaseAdapter = new LeftBaseAdapter(getActivity());
        listView.setAdapter(leftBaseAdapter);
        //listview点击事件
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                if (position==0){
                    //打开系统相册
                    Intent intent = new Intent(Intent.ACTION_PICK);
                    intent.setType("image/*");
                    startActivityForResult(intent,REQUEST_SECCESS);
                }else{
                    //调用MainActivity中切换页面的方法
                    ((MainActivity)getActivity()).showPage(position-1);
                }
            }
        });

    }
    //获取图片路径
    private String url2Path(Uri uri){
        String[] proj = {MediaStore.Images.Media.DATA};
        CursorLoader loader = new CursorLoader(getActivity(), uri, proj, null, null, null);
        Cursor cursor = loader.loadInBackground();
        int columnIndexOrThrow = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
        cursor.moveToFirst();
        return cursor.getString(columnIndexOrThrow);
    }
    //获取二次采样的图片
   private void progressImage(String imageurl){
       int size = getResources().getDimensionPixelSize(R.dimen.leftIconSize);
       NetUtils.getInsanner().getBitmap(imageurl, size, size, new NetUtils.ImageCallBack() {
           @Override
           public void onseccess(Bitmap bitmap) {
                leftBaseAdapter.setIconBitmap(bitmap);
           }
       });
   }
    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if (requestCode==REQUEST_SECCESS&&resultCode==getActivity().RESULT_OK){
            Uri uri =data.getData();
            //调用获取图片的方法
            progressImage(url2Path(uri));
        }
    }

    @Override
    protected int getLayoutResId() {
        return R.layout.letr_fragment_item;
    }
}

侧滑对应的适配器LeftBaseAdapter

package com.example.adapter;

import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.week_03_02.R;

public class LeftBaseAdapter extends BaseAdapter {
    private static final int COUNT_ITEM = 2;
    private static final int IMAGE_ITEM = 0;
    private static final int TEXT_ITEM = 1;
    private String[] meuns = new String[]{"首页","视频","我的"};
    private Context context;
    private  Bitmap bitmap;
    public LeftBaseAdapter(Context context) {
        this.context = context;
    }
    //传递图片的方法
    public void setIconBitmap(Bitmap bitmap){
        this.bitmap=bitmap;
        notifyDataSetChanged();
    }
    @Override
    public int getViewTypeCount() {
        return COUNT_ITEM;
    }

    @Override
    public int getItemViewType(int position) {
        return position==0?IMAGE_ITEM:TEXT_ITEM;
    }

    @Override
    public int getCount() {
        return meuns.length+1;
    }

    @Override
    public String getItem(int position) {
        return meuns[position-1];
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView==null){
            convertView=LayoutInflater.from(context).inflate(
                    getItemViewType(position)==IMAGE_ITEM? R.layout.image_item:R.layout.text_item
                    ,parent,false);
            holder=new ViewHolder(convertView);
        }else{
            holder= (ViewHolder) convertView.getTag();
        }
        //赋值
        if (getItemViewType(position)==TEXT_ITEM){
            holder.bindText(getItem(position));
        }else{
            if (bitmap!=null) {
                holder.bindIcoe(bitmap);
            }
        }
        return convertView;
    }
    class ViewHolder{
        TextView left_text;
        ImageView left_image;

        public ViewHolder(View convertView) {
            left_text=convertView.findViewById(R.id.left_text);
            left_image=convertView.findViewById(R.id.left_image);
            convertView.setTag(this);
        }

		//文本赋值
        public void bindText(String item) {
            left_text.setText(item);
        }
        //图片赋值
        public void bindIcoe(Bitmap bitmap) {
            left_image.setImageBitmap(bitmap);
        }
    }
}

侧滑所对应的布局文件

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <ListView
        android:id="@+id/listview"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
</android.support.constraint.ConstraintLayout>

侧滑对应的子布局

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:padding="10dp">
    <ImageView
        android:id="@+id/left_image"
        android:layout_width="100dp"
        android:layout_height="100dp"
        app:layout_constraintLeft_toRightOf="parent"
        app:layout_constraintRight_toLeftOf="parent"
        android:src="@mipmap/ic_launcher"/>
</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:padding="16dp">
        <TextView
            android:id="@+id/left_text"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintRight_toRightOf="parent"/>
</android.support.constraint.ConstraintLayout>

Activity主界面展示三个页面Fragment第一个HomeFragment：请求网络数据，多条目展示轮播图以及网络请求的数据，以及数据的上拉加载下拉刷新

package com.example.feagment;


import android.view.View;
import android.widget.ListView;
import android.widget.Toast;

import com.example.adapter.HomeBaseAdapter;
import com.example.bean.BannerBean;
import com.example.utils.NetUtils;
import com.example.week_03_02.R;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;

public class HomeFragment extends BaseFragment{
    private PullToRefreshListView home_listview;
    private String url="http://api.expoon.com/AppNews/getNewsList/type/1/p/%d";
    private HomeBaseAdapter homeBaseAdapter;
    private int mpage=1;
    @Override
    protected void initData() {
        if (mpage==1){
            loadBanner();
            loadData();
        }else{
            loadData();
        }
    }

    private void loadData() {
        NetUtils.getInsanner().getRequery(String.format(url, mpage), BannerBean.class, new NetUtils.CallBack<BannerBean>() {
            @Override
            public void onsucess(BannerBean o) {
                if (!NetUtils.getInsanner().isNetWork(getActivity())){
                    Toast.makeText(getActivity(),"当前无网络",Toast.LENGTH_SHORT).show();
                }else {
                    if (o==null||!o.isSuccess()){
                        Toast.makeText(getActivity(),"请求失败",Toast.LENGTH_SHORT).show();
                        home_listview.onRefreshComplete();
                        return;
                    }
                    if (mpage==1){
                        homeBaseAdapter.setData(o.getData());
                    }else{
                        homeBaseAdapter.addData(o.getData());
                    }
                    mpage++;
                    home_listview.onRefreshComplete();
                }
            }
        });
    }

    private void loadBanner() {
        NetUtils.getInsanner().getRequery(String.format(url, mpage), BannerBean.class, new NetUtils.CallBack<BannerBean>() {
            @Override
            public void onsucess(BannerBean o) {
                if (!NetUtils.getInsanner().isNetWork(getActivity())){
                    Toast.makeText(getActivity(),"当前无网络",Toast.LENGTH_SHORT).show();
                }else {
                    if (o==null||!o.isSuccess()){
                        Toast.makeText(getActivity(),"请求失败",Toast.LENGTH_SHORT).show();
                        home_listview.onRefreshComplete();
                        return;
                    }
                   homeBaseAdapter.setbanner(o.getData());
                    home_listview.onRefreshComplete();
                }
            }
        });
    }

    @Override
    protected void initView(View view) {
        //获取资源id
        home_listview=view.findViewById(R.id.home_listview);
        //创建适配器
        homeBaseAdapter = new HomeBaseAdapter(getActivity());
        home_listview.setAdapter(homeBaseAdapter);
        //设置刷新模式
        home_listview.setMode(PullToRefreshBase.Mode.BOTH);
        //刷新监听
        home_listview.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                mpage=1;
                initData();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
                initData();
            }
        });
        initData();
    }

    @Override
    protected int getLayoutResId() {
        return R.layout.home_item;
    }
}

对应的主布局home_item

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
   <com.handmark.pulltorefresh.library.PullToRefreshListView
       android:id="@+id/home_listview"
       android:layout_width="0dp"
       android:layout_height="0dp"
       app:layout_constraintLeft_toLeftOf="parent"
       app:layout_constraintRight_toRightOf="parent"
       app:layout_constraintTop_toTopOf="parent"
       app:layout_constraintBottom_toBottomOf="parent"/>

</android.support.constraint.ConstraintLayout>

对应的多条目展示数据的适配器HomeBaseAdapter

package com.example.adapter;

import android.annotation.SuppressLint;
import android.content.Context;
import android.os.Handler;
import android.os.Message;
import android.support.v4.view.ViewPager;
import android.util.TypedValue;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;

import com.example.bean.BannerBean;
import com.example.week_03_02.R;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.ArrayList;
import java.util.List;

public class HomeBaseAdapter extends BaseAdapter {
    private static final int COUNT_ITEM = 2;
    private static final int BANER_ITEM =0 ;
    private static final int DATA_ITEM = 1;
    private List<BannerBean.DataBean> mBanner;
    private List<BannerBean.DataBean> mData;
    private Context context;

    public HomeBaseAdapter(Context context) {
        this.context = context;
        mBanner=new ArrayList<>();
        mData=new ArrayList<>();
    }
    //更新banner数据
    public void setbanner(List<BannerBean.DataBean> data){
        mBanner.clear();
        if (data!=null){
            mBanner.addAll(data);
        }
        notifyDataSetChanged();
    }
    //下拉刷新
    public void setData(List<BannerBean.DataBean> data){
        mData.clear();
        if (data!=null){
            mData.addAll(data);
        }
        notifyDataSetChanged();
    }
    //上拉加载
    public void addData(List<BannerBean.DataBean> data){
        if (data!=null){
            mData.addAll(data);
        }
        notifyDataSetChanged();
    }

    @Override
    public int getViewTypeCount() {
        return COUNT_ITEM;
    }

    @Override
    public int getItemViewType(int position) {
        return position==0&&hasBanner()?BANER_ITEM:DATA_ITEM;
    }
    //判断banner是否存在
    private boolean hasBanner(){
        return mBanner.size()>0;
    }
    @Override
    public int getCount() {
        return mData.size()+(hasBanner()?1:0);
    }

    @Override
    public BannerBean.DataBean getItem(int position) {
        return mData.get(hasBanner()?position-1:position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (getItemViewType(position)==BANER_ITEM){
            BannerViewHolder holder;
            if (convertView==null){
                convertView=LayoutInflater.from(context).inflate(R.layout.benner_item,parent,false);
                holder=new BannerViewHolder(convertView);
            }else{
                holder= (BannerViewHolder) convertView.getTag();
            }
            holder.bindBanner(mBanner);
        }else{
            DataViewHolder holder;
            if (convertView==null){
                convertView=LayoutInflater.from(context).inflate(R.layout.data_item,parent,false);
                holder=new DataViewHolder(convertView);
            }else{
                holder= (DataViewHolder) convertView.getTag();
            }
            holder.bindData(getItem(position));
        }
        return convertView;
    }
    //寄存器
   class BannerViewHolder{
        ViewPager viewPager;
        TextView banner_text;
        LinearLayout linearLayout;
        @SuppressLint("HandlerLeak")
        private Handler handler = new Handler(){
            @Override
            public void handleMessage(Message msg) {
                //设置viewpager展示位置
                viewPager.setCurrentItem(viewPager.getCurrentItem()+1);
                //执行handle
                handler.sendEmptyMessageDelayed(0,2000);
            }
        };
        public BannerViewHolder(View convertView) {
            viewPager=convertView.findViewById(R.id.banner_viewpager);
            banner_text=convertView.findViewById(R.id.banner_text);
            linearLayout=convertView.findViewById(R.id.linearlayout);
            convertView.setTag(this);
        }

        public void bindBanner(final List<BannerBean.DataBean> mBanner) {
            //创建适配器
            BannerPageAdapter bannerPageAdapter = new BannerPageAdapter(mBanner, context);
            viewPager.setAdapter(bannerPageAdapter);
            //监听
            viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
               private int index=-1;
                @Override
                public void onPageScrolled(int i, float v, int i1) {

                }

                @Override
                public void onPageSelected(int i) {
                    //给变文件
                    banner_text.setText(mBanner.get(i%mBanner.size()).getNews_title());
                    //改变当前点
                    linearLayout.getChildAt(i%linearLayout.getChildCount()).setSelected(true);
                    //还原原来的点
                    if(index>=0){
                        linearLayout.getChildAt(index%linearLayout.getChildCount()).setSelected(false);
                    }
                    index=i;
                }

                @Override
                public void onPageScrollStateChanged(int i) {

                }
            });
            //初始化小圆点位置
            initDot(mBanner.size());
            //viewpager默认展示页面
            int count = bannerPageAdapter.getCount()/2;
            count=count-count%mBanner.size();
            viewPager.setCurrentItem(count);
            //开启轮播
            startlooper();

        }
        //开启轮播
        private void startlooper() {
            handler.removeMessages(0);
            handler.sendEmptyMessageDelayed(0,2000);
        }
        //初始化小圆点位置
        private void initDot(int size) {
            linearLayout.removeAllViews();
            for (int i=0;i<size;i++){
                ImageView imageView = new ImageView(context);
                imageView.setBackgroundResource(R.drawable.selector);
                //布局参数: 宽高包裹  左右8dp
                LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT,ViewGroup.LayoutParams.WRAP_CONTENT);
                int margin = (int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 2, context.getResources().getDisplayMetrics());
                params.leftMargin=margin;
                params.rightMargin=margin;
                linearLayout.addView(imageView,params);
            }
        }
    }




    class DataViewHolder{
        TextView news_id,news_title,news_summary;
        ImageView imageView;

        public DataViewHolder(View convertView) {
            news_id=convertView.findViewById(R.id.news_id);
            news_title=convertView.findViewById(R.id.news_title);
            news_summary=convertView.findViewById(R.id.news_summary);
            imageView=convertView.findViewById(R.id.data_image);
            convertView.setTag(this);
        }

        public void bindData(BannerBean.DataBean item) {
            news_id.setText(item.getNews_id());
            news_title.setText(item.getNews_title());
            news_summary.setText(item.getNews_summary());
            ImageLoader.getInstance().displayImage(item.getPic_url(),imageView);
        }
    }
}

对应的子布局benner_item（轮播图布局）和data_item（数据布局）

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <android.support.v4.view.ViewPager
        android:id="@+id/banner_viewpager"
        android:layout_width="0dp"
        android:layout_height="200dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
    <LinearLayout
        android:id="@+id/linearlayout"
        android:layout_width="wrap_content"
        android:layout_height="0dp"
        app:layout_constraintLeft_toRightOf="@id/banner_text"
        app:layout_constraintRight_toRightOf="@id/banner_viewpager"
        app:layout_constraintBottom_toBottomOf="@id/banner_viewpager"
        android:orientation="horizontal"
        android:padding="8dp"
        />
    <TextView
        android:id="@+id/banner_text"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="@id/banner_viewpager"
        app:layout_constraintLeft_toLeftOf="@id/banner_viewpager"
        app:layout_constraintRight_toLeftOf="@id/linearlayout"
        android:maxLines="1"
        android:ellipsize="end"
        android:textSize="18sp"/>
</android.support.constraint.ConstraintLayout>

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:padding="10dp">
    <ImageView
        android:id="@+id/data_image"
        android:layout_width="160dp"
        android:layout_height="120dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
    <TextView
        android:id="@+id/news_id"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toRightOf="@id/data_image"
        app:layout_constraintBottom_toTopOf="@id/news_title"/>
    <TextView
        android:id="@+id/news_title"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:maxLines="1"
        android:ellipsize="end"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/news_id"
        app:layout_constraintLeft_toRightOf="@id/data_image"
        app:layout_constraintBottom_toTopOf="@id/news_summary"/>
    <TextView
        android:id="@+id/news_summary"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:maxLines="3"
        android:ellipsize="end"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/news_title"
        app:layout_constraintLeft_toRightOf="@id/data_image"
        app:layout_constraintBottom_toBottomOf="parent"/>
</android.support.constraint.ConstraintLayout>

轮播图对应的适配器BannerPageAdapter

package com.example.adapter;

import android.content.Context;
import android.support.annotation.NonNull;
import android.support.v4.view.PagerAdapter;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;

import com.example.bean.BannerBean;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.List;

public class BannerPageAdapter extends PagerAdapter {
    private List<BannerBean.DataBean> mBanner;
    private Context context;

    public BannerPageAdapter(List<BannerBean.DataBean> mBanner, Context context) {
        this.mBanner = mBanner;
        this.context = context;
    }

    @Override
    public int getCount() {
        return 5000;
    }

    @Override
    public boolean isViewFromObject(@NonNull View view, @NonNull Object o) {
        return view==o;
    }

    @NonNull
    @Override
    public Object instantiateItem(@NonNull ViewGroup container, int position) {
        ImageView imageView = new ImageView(context);
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        container.addView(imageView);
        ImageLoader.getInstance().displayImage(mBanner.get(position%mBanner.size()).getPic_url(),imageView);
        return imageView;
    }

    @Override
    public void destroyItem(@NonNull ViewGroup container, int position, @NonNull Object object) {
        container.removeView((View) object);
    }
}

对应的bean类

package com.example.bean;

import android.content.Context;

import java.util.List;

public class BannerBean {


    private int status;
    private String info;
    private List<DataBean> data;
    public boolean isSuccess(){
        return status==1;
    }
    public int getStatus() {
        return status;
    }

    public void setStatus(int status) {
        this.status = status;
    }

    public String getInfo() {
        return info;
    }

    public void setInfo(String info) {
        this.info = info;
    }

    public List<DataBean> getData() {
        return data;
    }

    public void setData(List<DataBean> data) {
        this.data = data;
    }

    public static class DataBean {


        private String news_id;
        private String news_title;
        private String news_summary;
        private String pic_url;

        public String getNews_id() {
            return news_id;
        }

        public void setNews_id(String news_id) {
            this.news_id = news_id;
        }

        public String getNews_title() {
            return news_title;
        }

        public void setNews_title(String news_title) {
            this.news_title = news_title;
        }

        public String getNews_summary() {
            return news_summary;
        }

        public void setNews_summary(String news_summary) {
            this.news_summary = news_summary;
        }

        public String getPic_url() {
            return pic_url;
        }

        public void setPic_url(String pic_url) {
            this.pic_url = pic_url;
        }
    }
}

第二个fragment：fragment嵌套fragment展示网络请求数据

package com.example.feagment;


import android.support.design.widget.TabLayout;
import android.support.v4.view.ViewPager;
import android.view.View;

import com.example.adapter.VideoPageAdapter;
import com.example.week_03_02.R;

public class VideoFragment extends BaseFragment{
    private TabLayout video_tablayout;
    private ViewPager video_viewpager;
    @Override
    protected void initData() {

    }

    @Override
    protected void initView(View view) {
        //获取资源id
        video_tablayout=view.findViewById(R.id.video_tablayout);
        video_viewpager=view.findViewById(R.id.video_viewpager);
        //创建适配器
        video_viewpager.setAdapter(new VideoPageAdapter(getChildFragmentManager()));
        video_tablayout.setupWithViewPager(video_viewpager);
    }

    @Override
    protected int getLayoutResId() {
        return R.layout.video_item;
    }
}

对应的布局文件video_item

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <android.support.design.widget.TabLayout
        android:id="@+id/video_tablayout"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintBottom_toTopOf="@id/video_viewpager"/>
    <android.support.v4.view.ViewPager
        android:id="@+id/video_viewpager"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toBottomOf="@id/video_tablayout"/>
</android.support.constraint.ConstraintLayout>

对应的适配器VideoPageAdapter：嵌套fragment

package com.example.adapter;

import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;

import com.example.feagment.VideoSonFragment;

public class VideoPageAdapter extends FragmentPagerAdapter {
    private String[] meuns = new String[]{"正在上映","即将上映"};
    private String[] urls=new String[]{"http://172.17.8.100/movieApi/movie/v1/findHotMovieList?count=10&page=",
            "http://172.17.8.100/movieApi/movie/v1/findReleaseMovieList?count=10&page="};
    public VideoPageAdapter(FragmentManager fm) {
        super(fm);
    }

    @Override
    public Fragment getItem(int i) {
        switch (i){
            default:
                Bundle bundle = new Bundle();
                bundle.putString("url",urls[i]);
                VideoSonFragment videoSonFragment = new VideoSonFragment();
                videoSonFragment.setArguments(bundle);
                return videoSonFragment;
        }
    }

    @Override
    public int getCount() {
        return meuns.length;
    }

    @Nullable
    @Override
    public CharSequence getPageTitle(int position) {
        return meuns[position];
    }
}

嵌套的fragment布局样式相同，所以嵌套的两个fragment公用一个VideoSonFragment，一个布局videoson_item

package com.example.feagment;

import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;

import com.example.adapter.VideoBaseAdapter;
import com.example.bean.VideoBean;
import com.example.dao.VideoDao;
import com.example.utils.NetUtils;
import com.example.week_03_02.R;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;



public class VideoSonFragment extends BaseFragment {
    private PullToRefreshListView video_listview;
    private VideoBaseAdapter videoBaseAdapter;
    private int mpage=1;
    private String url;

    @Override
    protected void initData() {
        NetUtils.getInsanner().getRequery(url + mpage, VideoBean.class, new NetUtils.CallBack<VideoBean>() {
            @Override
            public void onsucess(VideoBean o) {
                //请求数据失败
                if (o==null||!o.isSuccess()){
                    Toast.makeText(getActivity(),"请求失败",Toast.LENGTH_SHORT).show();
                    //停止刷新，加载
                    video_listview.onRefreshComplete();
                    return;
                }
                //判断是当前第一页，清空数据库
                if (mpage==1){
                    VideoDao.getInsanner(getActivity()).deleteAll(url.hashCode());
                }
                //添加数据到数据库
                VideoDao.getInsanner(getActivity()).addAll(url.hashCode(),o.getResult());

                //请求数据成功
                if (mpage == 1) {
                    //查询数据库展示数据
                    videoBaseAdapter.setData(VideoDao.getInsanner(getActivity()).query(url.hashCode()));
                    //网络请求数据直接展示
                    //videoBaseAdapter.setData(o.getResult());
                } else {
                    videoBaseAdapter.addData(VideoDao.getInsanner(getActivity()).query(url.hashCode()));
                }
                //页面自增
                mpage++;
                //停止刷新加载
                video_listview.onRefreshComplete();
                //加载到最后一页数据后不再加载
                if (o.getResult().size()<10){
                    video_listview.setMode(PullToRefreshBase.Mode.PULL_FROM_START);
                }else{
                    video_listview.setMode(PullToRefreshBase.Mode.BOTH);
                }
            }
        });
    }

    @Override
    protected void initView(View view) {
        //获取适配传来的url
         url = getArguments().getString("url");
        //获取资源id
        video_listview=view.findViewById(R.id.video_listview);
        //创建适配器
        videoBaseAdapter = new VideoBaseAdapter(getActivity());
        video_listview.setAdapter(videoBaseAdapter);
        video_listview.setMode(PullToRefreshBase.Mode.BOTH);
        video_listview.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
                mpage=1;
                initData();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
                initData();
            }
        });
        initData();
        //点击条目删除数据
        video_listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                //调用删除数据库的方法
                VideoDao.getInsanner(getActivity()).delete(url.hashCode(),videoBaseAdapter.getItem(position).getId());
                //调用适配器里删除集合数据的方法
                videoBaseAdapter.del(position);
            }
        });
        //长按点击事件
      /* video_listview.getRefreshableView().setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
           @Override
           public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {

               return true;
           }
       });*/
    }

    @Override
    protected int getLayoutResId() {
        return R.layout.videoson_item;
    }
}

布局videoson_item

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <com.handmark.pulltorefresh.library.PullToRefreshListView
        android:id="@+id/video_listview"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
</android.support.constraint.ConstraintLayout>

嵌套fragment对应的适配器VideoBaseAdapter

package com.example.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import com.example.bean.VideoBean;
import com.example.week_03_02.R;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.ArrayList;
import java.util.List;

public class VideoBaseAdapter extends BaseAdapter {
    private List<VideoBean.ResultBean> list;
    private Context context;

    public VideoBaseAdapter(Context context) {
        this.context = context;
        list=new ArrayList<>();
    }
    //下拉刷新
    public void setData(List<VideoBean.ResultBean> data){
        list.clear();
        if (data!=null){
            list.addAll(data);
        }
        notifyDataSetChanged();
    }
    //上拉加载
    public void addData(List<VideoBean.ResultBean> data){
        if (data!=null){
            list.addAll(data);
        }
        notifyDataSetChanged();
    }
    //删除
    public void del(int position){
        list.remove(position-1);
        notifyDataSetChanged();
    }
    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public VideoBean.ResultBean getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView==null){
            convertView=LayoutInflater.from(context).inflate(R.layout.son_item,parent,false);
            holder=new ViewHolder(convertView);
        }else{
            holder= (ViewHolder) convertView.getTag();
        }
        holder.bindData(getItem(position));
        return convertView;
    }
    class ViewHolder{
        TextView name,summary;
        ImageView imageView;

        public ViewHolder(View convertView) {
            name=convertView.findViewById(R.id.name);
            summary=convertView.findViewById(R.id.summary);
            imageView=convertView.findViewById(R.id.son_image);
            convertView.setTag(this);
        }

        public void bindData(VideoBean.ResultBean item) {
            name.setText(item.getName());
            summary.setText(item.getSummary());
            if (imageView!=null){
                ImageLoader.getInstance().displayImage(item.getImageUrl(),imageView);
            }
        }
    }
}

嵌套对应的子布局son_item

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:padding="10dp">
    <ImageView
        android:id="@+id/son_image"
        android:layout_width="120dp"
        android:layout_height="160dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"/>
    <TextView
        android:id="@+id/name"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@id/son_image"
        app:layout_constraintBottom_toTopOf="@id/summary"/>
    <TextView
        android:id="@+id/summary"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintLeft_toRightOf="@id/son_image"
        app:layout_constraintTop_toBottomOf="@id/name"/>
</android.support.constraint.ConstraintLayout>

对应的bean

package com.example.bean;

import java.util.List;

public class VideoBean {



    private String message;
    private String status;
    private List<ResultBean> result;
    public boolean isSuccess(){
        return  status.equals("0000");
    }
    public String getMessage() {
        return message;
    }

    public void setMessage(String message) {
        this.message = message;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public List<ResultBean> getResult() {
        return result;
    }

    public void setResult(List<ResultBean> result) {
        this.result = result;
    }

    public static class ResultBean {


        private boolean followMovie;
        private int id;
        private String imageUrl;
        private String name;
        private int rank;
        private String summary;

        public ResultBean(int id, String imageUrl, String name, String summary) {
            this.id = id;
            this.imageUrl = imageUrl;
            this.name = name;
            this.summary = summary;
        }

        public boolean isFollowMovie() {
            return followMovie;
        }

        public void setFollowMovie(boolean followMovie) {
            this.followMovie = followMovie;
        }

        public int getId() {
            return id;
        }

        public void setId(int id) {
            this.id = id;
        }

        public String getImageUrl() {
            return imageUrl;
        }

        public void setImageUrl(String imageUrl) {
            this.imageUrl = imageUrl;
        }

        public String getName() {
            return name;
        }

        public void setName(String name) {
            this.name = name;
        }

        public int getRank() {
            return rank;
        }

        public void setRank(int rank) {
            this.rank = rank;
        }

        public String getSummary() {
            return summary;
        }

        public void setSummary(String summary) {
            this.summary = summary;
        }
    }
}

简析出来的数据展示数据库DataBaseSqlite

package com.example.database;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class DataBaseSqlite extends SQLiteOpenHelper {
    private static final String name ="video.db";
    private static final int version=1;
    public DataBaseSqlite( Context context) {
        super(context, name, null, version);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL("create table videos(_id integer primary key autoincrement," +
                "id integer," +
                "name text," +
                "summary text," +
                "imageUrl text," +
                "type integer)");
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {

    }

}

Dao包，增删改查的方法

package com.example.dao;

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import com.example.bean.VideoBean;
import com.example.database.DataBaseSqlite;

import java.util.ArrayList;
import java.util.List;

public class VideoDao {
    private static VideoDao insanner;
    private final SQLiteDatabase sb;


    public VideoDao(Context context) {
        //创建数据库
        sb = new DataBaseSqlite(context).getReadableDatabase();

    }

    public static VideoDao getInsanner(Context context) {
        if (insanner == null) {
            insanner = new VideoDao(context);
        }
        return insanner;
    }


    //添加数据
    public void addAll(int type, List<VideoBean.ResultBean> result) {
        try {
            sb.beginTransaction();
            for (VideoBean.ResultBean bean : result
                    ) {
                //添加到数据库
                add(type, bean);
            }
            sb.setTransactionSuccessful();
        } finally {
            sb.endTransaction();
        }
    }

    //添加到数据库
    private void add(int type, VideoBean.ResultBean bean) {
        ContentValues values = new ContentValues();
        values.put("id", bean.getId());
        values.put("name", bean.getName());
        values.put("summary", bean.getSummary());
        values.put("imageUrl", bean.getImageUrl());
        values.put("type", type);
        sb.insert("videos", null, values);
    }

    //清空数据库
    public void deleteAll(int type) {
        sb.delete("videos", "type=?", new String[]{String.valueOf(type)});
    }

    //删除单条数据
    public void delete(int type, int id) {
        sb.delete("videos", "type=? and id=?", new String[]{String.valueOf(type), String.valueOf(id)});
    }

    //查询所有数据
    public List<VideoBean.ResultBean> query(int type) {
        List<VideoBean.ResultBean> list = new ArrayList<>();
        Cursor cursor = sb.query("videos", null, "type=?", new String[]{String.valueOf(type)}, null, null, null);
        if (cursor != null) {
            while (cursor.moveToNext()) {
                list.add(
                        new VideoBean.ResultBean(
                                Integer.parseInt(cursor.getString(cursor.getColumnIndex("id"))),
                                cursor.getString(cursor.getColumnIndex("imageUrl")),
                                cursor.getString(cursor.getColumnIndex("name")),
                                cursor.getString(cursor.getColumnIndex("summary"))
                        )
                );
            }
            cursor.close();
        }
        return list;
    }


}

MyFragment：最后一个fragment通过PullToRefreshGridView展示图片

package com.example.feagment;


import android.view.View;
import android.widget.GridView;
import android.widget.Toast;

import com.example.adapter.MyPhotoAdapter;
import com.example.bean.PhotoBean;
import com.example.utils.NetUtils;
import com.example.week_03_02.R;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshGridView;

public class MyFragment extends BaseFragment{
    private PullToRefreshGridView gridView;
    private String url="http://api.tianapi.com/meinv/?key=7820faabcf4dc5f64ca166dd57b41a80&num=30";
    private MyPhotoAdapter myPhotoAdapter;
    private int mpage=1;

    @Override
    protected void initData() {
        NetUtils.getInsanner().getRequery(url, PhotoBean.class, new NetUtils.CallBack<PhotoBean>() {
            @Override
            public void onsucess(PhotoBean o) {
                if(o==null||!o.isSuccess()){
                    Toast.makeText(getActivity(),"请求失败",Toast.LENGTH_SHORT).show();
                    gridView.onRefreshComplete();
                    return;
                }
                if (mpage==1){
                    myPhotoAdapter.setdata(o.getNewslist());
                }else{
                    myPhotoAdapter.adddata(o.getNewslist());
                }
                mpage++;
                gridView.onRefreshComplete();
                if (o.getNewslist().size()<10){
                    gridView.setMode(PullToRefreshBase.Mode.PULL_FROM_START);
                }
            }
        });
    }

    @Override
    protected void initView(View view) {
        //获取资源id
        gridView=view.findViewById(R.id.my_gridview);
        //创建适配器
        myPhotoAdapter = new MyPhotoAdapter(getActivity());
        gridView.setAdapter(myPhotoAdapter);
        gridView.setMode(PullToRefreshBase.Mode.BOTH);
        gridView.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<GridView>() {
            @Override
            public void onPullDownToRefresh(PullToRefreshBase<GridView> refreshView) {
                mpage=1;
                initData();
            }

            @Override
            public void onPullUpToRefresh(PullToRefreshBase<GridView> refreshView) {
                initData();
            }
        });
        initData();
    }

    @Override
    protected int getLayoutResId() {
        return R.layout.my_item;
    }
}

对应的布局my_item

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    xmlns:app="http://schemas.android.com/apk/res-auto">
    <com.handmark.pulltorefresh.library.PullToRefreshGridView
        android:id="@+id/my_gridview"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:numColumns="3"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        />
</android.support.constraint.ConstraintLayout>

对应适配器MyPhotoAdapter

package com.example.adapter;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;

import com.example.bean.PhotoBean;
import com.example.week_03_02.R;
import com.nostra13.universalimageloader.core.ImageLoader;

import java.util.ArrayList;
import java.util.List;

public class MyPhotoAdapter extends BaseAdapter {
    private List<PhotoBean.NewslistBean> list;
    private Context context;

    public MyPhotoAdapter(Context context) {
        this.context = context;
        list=new ArrayList<>();
    }
    //下拉刷新
    public void setdata(List<PhotoBean.NewslistBean> data){
        list.clear();
        if (data!=null){
            list.addAll(data);
        }
        notifyDataSetChanged();
    }
    //上拉加载
    public void adddata(List<PhotoBean.NewslistBean> data){
        if (data!=null){
            list.addAll(data);
        }
        notifyDataSetChanged();
    }
    @Override
    public int getCount() {
        return list.size();
    }

    @Override
    public PhotoBean.NewslistBean getItem(int position) {
        return list.get(position);
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ViewHolder holder;
        if (convertView==null){
            convertView=LayoutInflater.from(context).inflate(R.layout.photo_item,parent,false);
            holder=new ViewHolder(convertView);
        }else{
            holder= (ViewHolder) convertView.getTag();
        }
        holder.bindData(getItem(position));
        return convertView;
    }
    class  ViewHolder{
        ImageView imageView;

        public ViewHolder(View convertView) {
            imageView=convertView.findViewById(R.id.photo_image);
            convertView.setTag(this);
        }

        public void bindData(PhotoBean.NewslistBean item) {
            ImageLoader.getInstance().displayImage(item.getPicUrl(),imageView);
        }
    }
}

对应的子布局photo_item

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:padding="20dp">
    <ImageView
        android:id="@+id/photo_image"
        android:layout_width="200dp"
        android:layout_height="200dp"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintTop_toTopOf="parent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent"/>
</android.support.constraint.ConstraintLayout>

工具类

package com.example.utils;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.net.Uri;
import android.os.AsyncTask;

import com.google.gson.Gson;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

public class NetUtils {
    private static NetUtils insanner;
    private Gson gson;
    public NetUtils() {
        gson=new Gson();
    }

    public static NetUtils getInsanner() {
        if (insanner==null){
            insanner=new NetUtils();
        }
        return insanner;
    }
    //获取图片的接口
    public  interface  ImageCallBack{
        void onseccess(Bitmap bitmap);
    }
    @SuppressLint("StaticFieldLeak")
    public  void getBitmap(String imageurl, final int width, final int height, final ImageCallBack imageCallBack){
        new AsyncTask<String,Void,Bitmap>(){
            @Override
            protected Bitmap doInBackground(String... strings) {
                return getBitmap(strings[0],width,height);
            }

            @Override
            protected void onPostExecute(Bitmap bitmap) {
                imageCallBack.onseccess(bitmap);
            }
        }.execute(imageurl);
    }
    //二次采样，根据图片路径 指定宽高，加载缩放图片
    public Bitmap getBitmap(String imageurl,int width,int height){
        //第一次加载宽高信息
        BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds=true;
        BitmapFactory.decodeFile(imageurl,options);
        //根据图片原始宽高 和请求宽高 计算采样率
        options.inSampleSize=Math.max(options.outWidth/width,options.outHeight/height);
        //设置真正加载的图片
        options.inJustDecodeBounds=false;
        //第二次加载图片
        return  BitmapFactory.decodeFile(imageurl,options);
    }
    //网络数据接口
    public interface CallBack<T>{
        void onsucess(T t);
    }
    //接口回调
    @SuppressLint("StaticFieldLeak")
    public  void getRequery(String urldata, final Class clazz, final CallBack callBack){
        new AsyncTask<String,Void,Object>(){
            @Override
            protected Object doInBackground(String... strings) {
                return getRequery(strings[0],clazz);
            }

            @Override
            protected void onPostExecute(Object o) {
                callBack.onsucess(o);
            }
        }.execute(urldata);
    }
    //gson解析网络数据
    public <E> E getRequery(String urldata,Class clazz){
        return (E) gson.fromJson(getRequery(urldata),clazz);
    }
    //获取网络数据
    public String getRequery(String urldata){
        String result="";
        try {
            URL url = new URL(urldata);
            HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
            urlConnection.setRequestMethod("GET");
            urlConnection.setConnectTimeout(5000);
            urlConnection.setReadTimeout(5000);
            int responseCode = urlConnection.getResponseCode();
            if (responseCode==200){
                result=getStram2String(urlConnection.getInputStream());
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
    //转换字节为字符
    private String getStram2String(InputStream inputStream) throws IOException {
        StringBuilder builder = new StringBuilder();
        BufferedReader br = new BufferedReader(new InputStreamReader(inputStream));
        for (String tmp=br.readLine();tmp!=null;tmp=br.readLine()){
            builder.append(tmp);
        }
        return builder.toString();
    }
    //判断是否有网络
    public boolean isNetWork(Context context){
        ConnectivityManager connectivityManager= (ConnectivityManager) context.getSystemService(context.CONNECTIVITY_SERVICE);
        NetworkInfo activeNetworkInfo = connectivityManager.getActiveNetworkInfo();
        return activeNetworkInfo!=null&&activeNetworkInfo.isAvailable();
    }
}

绘制轮播图小圆点

选中状态
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <size android:width="8dp" android:height="8dp"/>
    <solid android:color="#f00"/>
</shape>
未选中状态
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval">
    <size android:width="8dp" android:height="8dp"/>
    <solid android:color="#ccc"/>
</shape>

背景选择器stselector

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_selected="true" android:drawable="@drawable/sel_shape"/>
    <item android:drawable="@drawable/no_shape"/>
</selector>