在 Android 中Service, Broadcast, BroadcastReceiver 的演示
Main.java
package com.webabcd.service;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.os.Bundle;
import android.os.IBinder;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.TextView;
/*
* startService() 和 bindService() 的区别
* startService() - 正常理解就好
* bindService() - 使当前上下文对象（本例中就是 Activity）通过一个 ServiceConnection 对象邦定到指定的 Service 。这样，如果上下文对象销毁了的话，那么其对应的 Service 也会被销毁
*/
public class Main extends Activity implements OnClickListener {
private TextView txtMsg;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
setTitle("android 之 service");
this.findViewById(R.id.btnStart).setOnClickListener(this);
this.findViewById(R.id.btnStop).setOnClickListener(this);
this.findViewById(R.id.btnBind).setOnClickListener(this);
this.findViewById(R.id.btnUnbind).setOnClickListener(this);
txtMsg = (TextView)this.findViewById(R.id.txtMsg);
// 实例化自定义的 BroadcastReceiver
receiver = new UpdateReceiver();
IntentFilter filter = new IntentFilter();
// 为 BroadcastReceiver 指定 action ，使之用于接收同 action 的广播
filter.addAction("com.webabcd.service.msg");
// 以编程方式注册 BroadcastReceiver 。配置方式注册 BroadcastReceiver 的例子见 AndroidManifest.xml 文件
// 一般在 OnStart 时注册，在 OnStop 时取消注册
this.registerReceiver(receiver, filter);
// this.unregisterReceiver(receiver);
}
@Override
public void onClick(View v) {
Intent intent = new Intent(Main.this, MyService.class);
switch (v.getId()) {
case R.id.btnStart:
this.startService(intent);
break;
case R.id.btnStop:
this.stopService(intent);
break;
case R.id.btnBind:
this.bindService(intent, conn, Context.BIND_AUTO_CREATE);
break;
case R.id.btnUnbind:
this.unbindService(conn);
break;
}
}
// bindService() 所需的 ServiceConnection 对象
private ServiceConnection conn = new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName className, IBinder service) {
}
@Override
public void onServiceDisconnected(ComponentName className) {
}
};
private String msg="";
private UpdateReceiver receiver;
// 实现一个 BroadcastReceiver，用于接收指定的 Broadcast
public class UpdateReceiver extends BroadcastReceiver{
@Override
public void onReceive(Context context, Intent intent) {
msg = intent.getStringExtra("msg");
txtMsg.append(msg + "\n");
}
}
}
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MyService.java
package com.webabcd.service;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
// 演示 Service 的生命周期。具体信息运行程序后在 LogCat 中查看
public class MyService extends Service {
@Override
public IBinder onBind(Intent intent) {
Log.d("MyDebug", "onBind");
sendMsg("onBind");
// TODO Auto-generated method stub
return null;
}
@Override
public void onCreate() {
// TODO Auto-generated method stub
super.onCreate();
Log.d("MyDebug", "onCreate");
sendMsg("onCreate");
}
@Override
public void onDestroy() {
// TODO Auto-generated method stub
super.onDestroy();
Log.d("MyDebug", "onDestroy");
sendMsg("onDestroy");
}
@Override
public void onRebind(Intent intent) {
// TODO Auto-generated method stub
super.onRebind(intent);
Log.d("MyDebug", "onRebind");
sendMsg("onRebind");
}
@Override
public void onStart(Intent intent, int startId) {
super.onStart(intent, startId);
Log.d("MyDebug", "onStart");
sendMsg("onStart");
}
@Override
public boolean onUnbind(Intent intent) {
Log.d("MyDebug", "onUnbind");
sendMsg("onUnbind");
// TODO Auto-generated method stub
return super.onUnbind(intent);
}
// 发送广播信息
private void sendMsg(String msg){
// 指定广播目标的 action （注：指定了此 action 的 receiver 会接收此广播）
Intent intent = new Intent("com.webabcd.service.msg");
// 需要传递的参数
intent.putExtra("msg", msg);
// 发送广播
this.sendBroadcast(intent);
}
}
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MyBootReceiver.java
package com.webabcd.service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.util.Log;
public class MyBootReceiver extends BroadcastReceiver {
// 用于接收满足条件的 Broadcast（相应的 Broadcast 的注册信息详见 AndroidManifest.xml ，当系统启动完毕后会调用这个广播接收器）
@Override
public void onReceive(Context arg0, Intent arg1) {
Log.d("MyDebug", "onReceive");
// 启动服务
Intent service = new Intent(arg0, MyService.class);
arg0.startService(service);
}
}
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AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.webabcd.service" android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon" android:label="@string/app_name">
<activity android:name=".Main" android:label="@string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!--
如果有需要用到的 service ，则都要在这里做相应的配置
-->
<service android:name=".MyService"></service>
<!--
注册一个 BroadcastReceiver
其 intent-filter 为 android.intent.action.BOOT_COMPLETED（用于接收系统启动完毕的 Broadcast）
-->
<receiver android:name=".MyBootReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
</application>
<!--
接受系统启动完毕的 Broadcast 的权限
-->
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-sdk android:minSdkVersion="3" />
</manifest>