《Xlistview 展示下拉刷新数据》

版权声明：李帅哲专属 https://blog.csdn.net/weixin_43584282/article/details/83866241

//主布局界面

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout 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”
tools:context=".MainActivity">

<me.maxwin.view.XListView
    android:id="@+id/news"
    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_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

//子布局

<?xml version="1.0" encoding="utf-8"?>

<android.support.constraint.ConstraintLayout xmlns:android=“http://schemas.android.com/apk/res/android”
xmlns:app=“http://schemas.android.com/apk/res-auto”
android:layout_width=“match_parent”
android:layout_height=“wrap_content”
android:padding=“16dp”>

<TextView
    android:id="@+id/title"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintLeft_toLeftOf="parent"
    app:layout_constraintRight_toRightOf="parent"
    android:text="title"
    app:layout_constraintTop_toTopOf="parent" />

</android.support.constraint.ConstraintLayout>

主函数

package com.example.myapplication;

import android.os.AsyncTask;
import android.os.SystemClock;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;

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

import me.maxwin.view.XListView;

public class MainActivity extends AppCompatActivity {

private XListView news;
private int mPage;
private NewsAdapter mAdapter;

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

    mPage = 1;

    news = findViewById(R.id.news);
    mAdapter = new NewsAdapter(this);
    news.setAdapter(mAdapter);

    news.setPullRefreshEnable(true);
    //设置开启加载更多
    news.setPullLoadEnable(true);

    news.setXListViewListener(new XListView.IXListViewListener() {
        @Override
        public void onRefresh() {//刷新
            mPage = 1;
            loadData();
        }

        @Override
        public void onLoadMore() {//加载
            mPage ++;
            loadData();
        }
    });

    loadData();
}

private void loadData() {
    new AsyncTask<Void, Void, List<String>>(){
        @Override
        protected List<String> doInBackground(Void... voids) {
            SystemClock.sleep(1000);
            List<String> result = new ArrayList<>();
            String pre = new Date().toLocaleString();
            for (int i = 0; i < 30; i++) {
                result.add(pre + "第" + mPage + "页" + i);
            }
            return result;
        }

        @Override
        protected void onPostExecute(List<String> strings) {
            if(mPage == 1) {
                mAdapter.setDatas(strings);
            } else {
                mAdapter.addDatas(strings);
            }
            //告诉XListView停止刷新/加载
            news.stopRefresh();
            news.stopLoadMore();
        }
    }.execute();
    }
}

//适配器

package com.example.myapplication;

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

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

public class NewsAdapter extends BaseAdapter {

private List<String> mDatas;
private Context mContext;

public NewsAdapter(Context context) {
    mContext = context;
    mDatas = new ArrayList<>();
}

//更新数据
public void setDatas(List<String> datas) {
    ///////////////
    //mDatas = datas;

    //清
    mDatas.clear();
    //添加新的
    mDatas.addAll(datas);
    notifyDataSetChanged();
}


//追加数据
public void addDatas(List<String> datas) {
    //mDatas = datas;
    //追加所有数据
    mDatas.addAll(datas);
   /* for (String tmp:datas) {
        mDatas.add(tmp);
    }*/
    notifyDataSetChanged();
}

@Override
public int getCount() {
    return mDatas.size();
}

@Override
public String getItem(int position) {
    return mDatas.get(position);
}

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

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    ViewHolder viewHolder;

    if(convertView == null) {
        convertView = LayoutInflater.from(mContext).inflate(R.layout.item, parent, false);
        viewHolder = new ViewHolder(convertView);
    } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }

    viewHolder.bindData(getItem(position));

    return convertView;
}

class ViewHolder {
    TextView textView;

    public ViewHolder(View itemView) {
        this.textView = itemView.findViewById(R.id.title);
        itemView.setTag(this);
    }

    public void bindData(String title) {
            textView.setText(title);
        }
	    }
	}

//权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.myapplication">

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
</application>