容易的下拉刷新以及优化-SwipeRefreshLayout

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 2     xmlns:tools="http://schemas.android.com/tools" 3     android:layout_width="match_parent" 4     android:layout_height="match_parent" 5     tools:context="com.zzw.testswiperefreshlayout.MainActivity" > 6  7     <android.support.v4.widget.SwipeRefreshLayout 8         android:id="@+id/swipeRefreshLayoyut" 9         android:layout_width="match_parent"10         android:layout_height="match_parent" >11 12         <ListView13             android:id="@+id/listView"14             android:layout_width="match_parent"15             android:layout_height="match_parent" />16     </android.support.v4.widget.SwipeRefreshLayout>17 18 </RelativeLayout>

 1 package com.zzw.testswiperefreshlayout; 2  3 import java.util.ArrayList; 4  5 import android.app.Activity; 6 import android.os.Bundle; 7 import android.support.v4.widget.SwipeRefreshLayout; 8 import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener; 9 import android.widget.ArrayAdapter;10 import android.widget.ListView;11 12 public class MainActivity extends Activity {13 14     private SwipeRefreshLayout swipeRefreshLayout;15 16     private int count = 0;17     private ArrayList<String> data;18     private ArrayAdapter<String> adapter;19 20     @Override21     protected void onCreate(Bundle savedInstanceState) {22         super.onCreate(savedInstanceState);23         setContentView(R.layout.activity_main);24 25         data = new ArrayList<String>();26 27         swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayoyut);28         ListView listView = (ListView) findViewById(R.id.listView);29 30         // 设置刷新动画的颜色，可以设置1或者更多.31         // 我们暂时使用三个Android系统自带的颜色。32         swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_red_light, android.R.color.holo_green_light,33                 android.R.color.holo_orange_light);34 35         swipeRefreshLayout.setOnRefreshListener(new OnRefreshListener() {36 37             @Override38             public void onRefresh() {39                 longTimeOperation();40             }41         });42         // 使用Android系统自带的一个简单TextView布局文件android.R.layout.simple_list_item_1显示我们的数据内容。43         adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);44 45         listView.setAdapter(adapter);46     }47 48     // 每一次下拉刷新将触发更新操作动作。49     // 这里将是比较耗时的操作：如网络请求的数据，加载一个大图片。50     // 简单期间，我们假设就是简单的将count数据加1，然后更新显示。51     //52     // 备注：swipeRefreshLayout.setRefreshing(true) 到53     // swipeRefreshLayout.setRefreshing(false)之间的这段代码 ,54     // 在实际的应用开发中一般就是线程化的、耗时的或者后台的操作代码。55     private void longTimeOperation() {56         // true，刷新开始，所以启动刷新的UI样式.57         swipeRefreshLayout.setRefreshing(true);58 59         // 开始启动刷新...60         // 在这儿放耗时操作的 AsyncTask线程、后台Service等代码。61 62         // add(0,xxx)每次将更新的数据xxx添加到头部。63         data.add(0, "" + count++);64         adapter.notifyDataSetChanged();65 66         // 刷新完毕67         // false，刷新完成，因此停止UI的刷新表现样式。68         swipeRefreshLayout.setRefreshing(false);69     }70 71 }

 1 package com.zzw.testswiperefreshlayout; 2  3 import java.util.ArrayList; 4  5 import android.app.Activity; 6 import android.os.AsyncTask; 7 import android.os.Bundle; 8 import android.os.SystemClock; 9 import android.support.v4.widget.SwipeRefreshLayout;10 import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;11 import android.widget.ArrayAdapter;12 import android.widget.ListView;13 14 public class MainActivity extends Activity {15 16     private SwipeRefreshLayout swipeRefreshLayout;17 18     private int count = 0;19     private ArrayList<String> data;20     private ArrayAdapter<String> adapter;21 22     @Override23     protected void onCreate(Bundle savedInstanceState) {24         super.onCreate(savedInstanceState);25         setContentView(R.layout.activity_main);26 27         data = new ArrayList<String>();28 29         swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipeRefreshLayoyut);30         ListView listView = (ListView) findViewById(R.id.listView);31 32         // 设置刷新动画的颜色，可以设置1或者更多.33         // 我们暂时使用三个Android系统自带的颜色。34         swipeRefreshLayout.setColorSchemeResources(android.R.color.holo_red_light, android.R.color.holo_green_light,35                 android.R.color.holo_orange_light);36 37         swipeRefreshLayout.setOnRefreshListener(new OnRefreshListener() {38 39             @Override40             public void onRefresh() {41                 new MyAsyncTask().execute();42             }43         });44         // 使用Android系统自带的一个简单TextView布局文件android.R.layout.simple_list_item_1显示我们的数据内容。45         adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, data);46 47         listView.setAdapter(adapter);48     }49 50     private class MyAsyncTask extends AsyncTask {51 52         // 初始化53         @Override54         protected void onPreExecute() {55             // true，刷新开始，所以启动刷新的UI样式.56             swipeRefreshLayout.setRefreshing(true);57         }58 59         protected Object doInBackground(Object... params) {60             // 假设耗时5秒61             SystemClock.sleep(5000);62             return count++;63         }64 65         @Override66         protected void onPostExecute(Object result) {67             // add(0,xxx)每次将更新的数据xxx添加到头部。68             data.add(0, result + "");69             adapter.notifyDataSetChanged();70 71             // 刷新完毕72             // false，刷新完成，因此停止UI的刷新表现样式。73             swipeRefreshLayout.setRefreshing(false);74         }75 76     }77 78 }