android下拉刷新
下拉刷新效果实现图:
下拉刷新代码实现,xml部分代码:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
<com.handmark.pulltorefresh.library.PullToRefreshListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/ptrlv_reflsh"
>
</com.handmark.pulltorefresh.library.PullToRefreshListView>
</LinearLayout>
java部分代码:
package com.example.kongjian_06;
import android.os.AsyncTask;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
import com.handmark.pulltorefresh.library.PullToRefreshBase;
import com.handmark.pulltorefresh.library.PullToRefreshListView;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Administrator on 2017/6/11.
*/
public class PullToRefresh extends AppCompatActivity {
private PullToRefreshListView ptrlv;
private List<String> list;
private ArrayAdapter aa;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pulltorefresh);
ptrlv = (PullToRefreshListView) findViewById(R.id.ptrlv_reflsh);//获取PullToRefreshListView
list = new ArrayList<>();//new一个集合
for (int i = 0; i <10 ; i++) {
list.add("haha"+i);//将数据填入集合中
}
aa = new ArrayAdapter(this,android.R.layout.simple_list_item_1,list);//new一个适配器
ptrlv.setAdapter(aa);//给ptrlv设置适配器
ptrlv.setOnRefreshListener(new PullToRefreshBase.OnRefreshListener2<ListView>() {
@Override
public void onPullDownToRefresh(PullToRefreshBase<ListView> refreshView) {
new MyTask().execute();//newMyTask并执行
}
@Override
public void onPullUpToRefresh(PullToRefreshBase<ListView> refreshView) {
}
});
}
class MyTask extends AsyncTask{
@Override
protected Object doInBackground(Object[] params) {
for (int i = 0; i <3 ; i++) {
list.add(0,"huohuo"+i);//将数据添加到数据最前面
}
return null;
}
@Override
protected void onPostExecute(Object o) {
super.onPostExecute(o);
ptrlv.onRefreshComplete();
aa.notifyDataSetChanged();//通知适配器发生改变
}
}
}
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