Android SwipeRefreshLayout下拉刷新（两种不阻碍线程的方式）

MainActivity需要的布局文件activity_main.xml，里面有SwipeRefreshLayout和ListView的写法。

效果如图：

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

<android.support.v4.widget.SwipeRefreshLayout
android:id="@+id/swipeRefreshLayout"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<ListView
android:id="@+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</ListView>
</android.support.v4.widget.SwipeRefreshLayout>

</LinearLayout>

java代码，用AsyncTask实现：

package com.example.swiperefreshlayout;

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

import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

private List<String> list;
private ListView listview;
private SwipeRefreshLayout swipeRefresh;
private ArrayAdapter mAdapter;
private int count = 0;

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

list = new ArrayList<String>();
String[] names = { "张三", "李四", "王二", "赵六", "陈五" };
for (int i = 0; i < names.length; i++) {

list.add(names[i]);
}

listview = (ListView) findViewById(R.id.list_view);

mAdapter = new MyAdapter(this, -1);
listview.setAdapter(mAdapter);

swipeRefresh = (SwipeRefreshLayout) findViewById(R.id.swiperefresh);

// 设置刷新动画的颜色，可以设置1或者更多.
// 我们暂时使用三个Android系统自带的颜色。
swipeRefresh.setColorSchemeResources(android.R.color.holo_red_light, android.R.color.holo_orange_light,
android.R.color.holo_green_light);

swipeRefresh.setOnRefreshListener(new OnRefreshListener() {

// SwipeRefreshLayout接管其包裹的ListView下拉事件。
// 每一次对ListView的下拉动作，将触发SwipeRefreshLayout的onRefresh()。
@Override
public void onRefresh() {
new MyAsyncTask().execute();
}
});
}

// 每一次下拉刷新将触发更新操作动作。
// 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。
// 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。
//
// 备注：swipeRefreshLayout.setRefreshing(true) 到
// swipeRefreshLayout.setRefreshing(false)之间的这段代码 ,
// 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。
private class MyAsyncTask extends AsyncTask {

@Override
protected void onPreExecute() {
super.onPreExecute();
// true，刷新开始，所以启动刷新的UI样式.
swipeRefresh.setRefreshing(true);
// 开始启动刷新...
}

@Override
protected Object doInBackground(Object... params) {
// 在这儿放耗时操作的 AsyncTask线程、后台Service等代码。
try {
Thread.sleep(5000);
int result = count++;

return result;
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

return null;
}

@Override
protected void onPostExecute(Object result) {
super.onPostExecute(result);
// add(0,xxx)每次将更新的数据xxx添加到头部。
list.add(0, "" + result);

mAdapter.notifyDataSetChanged();

swipeRefresh.setRefreshing(false);

// 刷新完毕.

// false，刷新完成，因此停止UI的刷新表现样式。

}
}

private class MyAdapter extends ArrayAdapter {

private Context mContext;
private LayoutInflater inflater;

public MyAdapter(Context context, int textViewResourceId) {
super(context, textViewResourceId);

this.mContext = context;
inflater = LayoutInflater.from(context);

}

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

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

if (convertView == null)
convertView = inflater.inflate(android.R.layout.simple_list_item_1, null);

TextView text = (TextView) convertView.findViewById(android.R.id.text1);
text.setTextSize(25);
text.setText(list.get(position));
return convertView;
}
}

}

用Handler实现：

package com.example.swiperefreshlayout;

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

import android.app.Activity;
import android.content.Context;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

private List<String> list;
private ListView listview;
private SwipeRefreshLayout swipeRefresh;
private ArrayAdapter mAdapter;
private int count = 0;
Handler handler = new Handler() {
@Override
public void handleMessage(Message msg) {
super.handleMessage(msg);

int a = (Integer) msg.obj;

swipeRefresh.setRefreshing(true);

list.add(0, "" + a);

mAdapter.notifyDataSetChanged();

swipeRefresh.setRefreshing(false);
}
};

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

list = new ArrayList<String>();
String[] names = { "张三", "李四", "王二", "赵六", "陈五" };
for (int i = 0; i < names.length; i++) {

list.add(names[i]);
}

listview = (ListView) findViewById(R.id.list_view);

mAdapter = new MyAdapter(this, -1);
listview.setAdapter(mAdapter);

swipeRefresh = (SwipeRefreshLayout) findViewById(R.id.swiperefresh);
swipeRefresh.setColorSchemeResources(android.R.color.holo_red_light, android.R.color.holo_orange_light,
android.R.color.holo_green_light);

swipeRefresh.setOnRefreshListener(new OnRefreshListener() {

@Override
public void onRefresh() {
longTimeOperation();
}
});
}

private class MyAdapter extends ArrayAdapter {

private Context mContext;
private LayoutInflater inflater;

public MyAdapter(Context context, int textViewResourceId) {
super(context, textViewResourceId);

this.mContext = context;
inflater = LayoutInflater.from(context);

}

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

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

if (convertView == null)
convertView = inflater.inflate(android.R.layout.simple_list_item_1, null);

TextView text = (TextView) convertView.findViewById(android.R.id.text1);
text.setTextSize(25);
text.setText(list.get(position));
return convertView;
}
}

private void longTimeOperation() {

new Thread(new Runnable() {

@Override
public void run() {

// swipeRefresh.setRefreshing(true);
//
// list.add(0, "" + count++);
//
// mAdapter.notifyDataSetChanged();
//
// swipeRefresh.setRefreshing(false);
try {
Thread.sleep(5000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}

Message msg = handler.obtainMessage();

msg.obj = count++;
handler.sendMessage(msg);

}
}).start();

}
}