android 广播更新界面

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android 更新界面的方式一般包括，接口回调，servcie加广播，handler， 现在先介绍一下广播加service来更新界面

service

import java.util.Timer;
import java.util.TimerTask;

import android.app.Service;
import android.content.Intent;
import android.os.IBinder;

public class ServiceUpdateUI extends Service {

private Timer timer;
private TimerTask task;
private int count;

@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onCreate() {
super.onCreate();
final Intent intent = new Intent();
intent.setAction(MainActivity.ACTION_UPDATEUI);
timer = new Timer();
task = new TimerTask() {

@Override
public void run() {
intent.putExtra("count", ++count);
sendBroadcast(intent);
}
};
timer.schedule(task, 1000, 1000);
}

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

然后在需要的地方注册广播和开启服务，在广播中获取服务中发送来的广播内容， 在广播里面更新界面

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends Activity {

private TextView textView;
public static final String ACTION_UPDATEUI = "action.updateUI";
UpdateUIBroadcastReceiver broadcastReceiver;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);

setContentView(R.layout.service_update_ui);
textView = (TextView) findViewById(R.id.count_txt);

// 动态注册广播
IntentFilter filter = new IntentFilter();
filter.addAction(ACTION_UPDATEUI);
broadcastReceiver = new UpdateUIBroadcastReceiver();
registerReceiver(broadcastReceiver, filter);

// 启动服务
Intent intent = new Intent(this, ServiceUpdateUI.class);
startService(intent);
}

/**
* 定义广播接收器（内部类）
*/
private class UpdateUIBroadcastReceiver extends BroadcastReceiver {

@Override
public void onReceive(Context context, Intent intent) {
textView.setText(String.valueOf(intent.getExtras().getInt("count")));
}

}

@Override
protected void onDestroy() {
super.onDestroy();
// 注销广播
unregisterReceiver(broadcastReceiver);
// 消除服务
Intent intent = new Intent(this, ServiceUpdateUI.class);
stopService(intent);
}
}

源码下载地址

http://download.csdn.net/detail/u012184853/9315919