recycleView 简单模板框架

1、功能简介

实现recycle 和 自定义 item 的适配
读取 姓名

2、文件结构

3、build.gradle(Module:app)

添加 recycleView 编译引用

compile ‘com.android.support:recyclerview-v7:26.1.0’

4、activity_main.xml 文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


        <LinearLayout
            android:id="@+id/lay_id"
            android:layout_marginLeft="5dp"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:orientation="horizontal">

            <android.support.v7.widget.RecyclerView
                android:id="@+id/recycle_list_id"
                android:layout_width="match_parent"
                android:layout_height="match_parent">

            </android.support.v7.widget.RecyclerView>

        </LinearLayout>



</LinearLayout>

5、recycleview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="wrap_content"
    android:layout_height="match_parent"
>


    <RelativeLayout
        android:id="@+id/item_lay_id"
        android:layout_width="wrap_content"
        android:layout_height="100dp"
        android:layout_gravity="center"

        android:gravity="center">


        <LinearLayout
            android:id="@+id/item_id"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:background="#ff5a5a5a"
            android:alpha="0.7"
            android:gravity="center"
            >

            <TextView
                android:id="@+id/item_name_id"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:text="name"
                android:textColor="#FFFFFF"
                android:textSize="30dp"
                />


        </LinearLayout>
    </RelativeLayout>


</LinearLayout>

6、RecycleViewAdapter 文件

package com.example.lum.myrecycleview;

import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.RelativeLayout;
import android.widget.TextView;
import android.widget.Toast;

import java.util.ArrayList;

public class RecycleViewAdapter extends RecyclerView.Adapter<RecycleViewAdapter.ViewHolder> implements View.OnClickListener {
    private static final String TAG = "RecycleViewAdapter";
    Context mContext;
    private ArrayList<StudentData> mrecycleDataList;


    // Provide a suitable constructor (depends on the kind of dataset)
    public RecycleViewAdapter(Context context, ArrayList<StudentData> mrecycleDataList) {
        this.mContext = context;
        this.mrecycleDataList = mrecycleDataList;
    }

    private void populateLauncherView(final ViewHolder holder, StudentData studentData, int positon) {
        System.out.println(TAG + " 位置 item  Position:" + positon);

        holder.textViewName.setText(studentData.getStudentName()+ ""); //设置
        holder.textViewName.setTag(positon);

        holder.relativeLayout.setTag(positon);
        holder.itemView.setTag(positon);

        holder.textViewName.setOnClickListener(this);

    }

    @Override
    public int getItemViewType(int position) {
        return position;
    }

    // Replace the contents of a view (invoked by the layout manager)
    @Override
    public void onBindViewHolder(ViewHolder holder, int position) {
        // - get element from your dataset at this position
        // - replace the contents of the view with that element


        StudentData studentData = (StudentData) mrecycleDataList.get(position);
        populateLauncherView(holder, studentData,position);

    }

    // Return the size of your dataset (invoked by the layout manager)
    @Override
    public int getItemCount() {
        return mrecycleDataList.size();
    }


    @Override
    public void onClick(View v) {
        Toast.makeText(mContext, "name  view  this  click", Toast.LENGTH_SHORT).show();
    }

    // Provide a reference to the views for each data item
    // Complex data items may need more than one view per item, and
    // you provide access to all the views for a data item in a view holder

    //初始化  icon  界面
    public static class ViewHolder extends RecyclerView.ViewHolder {
        // each data item is just a string in this case

        public RelativeLayout relativeLayout;
        public TextView textViewName;
        public LinearLayout mRootView;
        public ViewGroup mParent;

        public ViewHolder(LinearLayout v, ViewGroup parent) {
            super(v);
            mRootView = v;
            mParent = parent;
            relativeLayout = (RelativeLayout) v.findViewById(R.id.item_lay_id);
            textViewName = (TextView) v.findViewById(R.id.item_name_id);

        }
    }

    // Create new views (invoked by the layout manager)
    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent,
                                                         int viewType) {
        // create a new view
        LinearLayout v = (LinearLayout) LayoutInflater.from(parent.getContext())
                .inflate(R.layout.recycleview_item, parent, false);

        ViewHolder vh = new ViewHolder(v, parent);
        return vh;
    }

}

7、StudentData 文件

package com.example.lum.myrecycleview;

import android.util.Log;

/**
 * Created by menglux on 5/11/2018.
 */

public class StudentData {
    private  String  TAG = "StudentData: ";

    private String  name = "";

    public StudentData(){}

    public  void  setStudentName(String  name) {
        this.name = name;
        Log.i(TAG,"setName: " + name );
    }
    public String  getStudentName() {
        return  name;
    }


}

8、MainActivity 文件

package com.example.lum.myrecycleview;

import android.app.Activity;
import android.os.Bundle;
import android.support.v7.widget.DividerItemDecoration;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import java.util.ArrayList;


public class MainActivity extends Activity {
    private static final String TAG = "MainActivity: ";

    private RecyclerView recyclerView;  //recycleView 对象
    public ArrayList<StudentData> mStuDataList;   //studentData  类的对象 集合
    private RecycleViewAdapter mRecycleViewAdapter;  //recycle 适配器类

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // listvew 显示
        recyclerView = (RecyclerView) findViewById(R.id.recycle_list_id);

        LinearLayoutManager layoutManager = new LinearLayoutManager(this,
                LinearLayoutManager.HORIZONTAL,false);   //设置recycleView 水平
        recyclerView.setLayoutManager(layoutManager);


        creatListData(); //初始化 数据

        mRecycleViewAdapter = new RecycleViewAdapter(this, mStuDataList);  //适配器 和 view适配
        recyclerView.setAdapter(mRecycleViewAdapter);

        mRecycleViewAdapter.notifyDataSetChanged();  //刷新 view 数据

        recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.HORIZONTAL));  //recycleView 间隔


    }


    private void setTextColor() {

        int position = 2; //选定的显示学生的位置
        //通过 activity  获得adapter 里面的组件
       LinearLayoutManager mlayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();

          int firstPosition = mlayoutManager.findFirstVisibleItemPosition();
           int lastPosition = mlayoutManager.findLastVisibleItemPosition();

        if (position < firstPosition || position > lastPosition) {

            recyclerView.smoothScrollToPosition(position); //滚动到指定的位置
            Log.i(TAG, "```````````不在显示区域  滚动到显示区域");

        } else { //直接获取
            Log.i(TAG, "```````````在显示区域 字体颜色改变");
            //获取view  某个位置的 item
            View viewItem = mlayoutManager.getChildAt(position - (int) mlayoutManager.getChildAt(0).getTag());//通过获取Child(0)的tag得到第一个Child的实际位置 }

            if (viewItem == null) {
                Toast.makeText(MainActivity.this, "viewItem is null", Toast.LENGTH_SHORT).show();
            }
            //获取某个位置 item 的 viewHold
            RecycleViewAdapter.ViewHolder viewHolder = (RecycleViewAdapter.ViewHolder) recyclerView.getChildViewHolder(viewItem);

            //获取某个位置 item 的 的 某个组件
            viewHolder.textViewName.setTextColor(getResources().getColor(R.color.colorPrimary));//设定此位置 字体颜色蓝色

        }


    }


    protected void onResume() {
        super.onResume();
new Thread(new Runnable() {
    @Override
    public void run() {
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        setTextColor();
    }
}).start();
    }

    @Override
    public  void onDestroy() {
        super.onDestroy();
    }

    private void creatListData() {

        Log.i(TAG,"创建 recycleList 数据");
        mStuDataList = new ArrayList<StudentData>();
        mStuDataList.clear();

        for (int i=0; i<10; i++) {      //添加 10 个空的   对象
            StudentData studentData = new StudentData();
            studentData.setStudentName("name: " + i);  //初始化 类名
            mStuDataList.add(studentData);
        }
    }

}