Android_BroadcastReceiver

// 继承BroadcastReceivre基类
public class mBroadcastReceiver extends BroadcastReceiver {
  // 复写onReceive()方法
  // 接收到广播后，则自动调用该方法
  @Override
  public void onReceive(Context context, Intent intent) {
   //写入接收广播后的操作
    }
}

<receiver 
          android:enabled=["true" | "false"]
          //此broadcastReceiver能否接收其他App的发出的广播
          //默认值是由receiver中有无intent-filter决定的：如果有intent-filter，默认值为true，否则为false
          android:exported=["true" | "false"]
          android:icon="drawable resource"
          android:label="string resource"
          //继承BroadcastReceiver子类的类名
          android:name=".mBroadcastReceiver"
          //具有相应权限的广播发送者发送的广播才能被此BroadcastReceiver所接收；
          android:permission="string"
          //BroadcastReceiver运行所处的进程
          //默认为app的进程，可以指定独立的进程
          //注：Android四大基本组件都可以通过此属性指定自己的独立进程
          android:process="string" >

    //用于指定此广播接收器将接收的广播类型
    //本示例中给出的是用于接收网络状态改变时发出的广播
    <intent-filter>
        <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
    </intent-filter>
</receiver>

// 选择在Activity生命周期方法中的onResume()中注册
@Override
protected void onResume(){
    super.onResume();
    // 1. 实例化BroadcastReceiver子类 &  IntentFilter
    mBroadcastReceiver mBroadcastReceiver = new mBroadcastReceiver();
    IntentFilter intentFilter = new IntentFilter();
    // 2. 设置接收广播的类型
    intentFilter.addAction(android.net.conn.CONNECTIVITY_CHANGE);
    // 3. 动态注册：调用Context的registerReceiver（）方法
    registerReceiver(mBroadcastReceiver, intentFilter);
}
// 注册广播后，要在相应位置记得销毁广播
// 即在onPause() 中unregisterReceiver(mBroadcastReceiver)
// 当此Activity实例化时，会动态将MyBroadcastReceiver注册到系统中
// 当此Activity销毁时，动态注册的MyBroadcastReceiver将不再接收到相应的广播。
@Override
protected void onPause() {
    super.onPause();
    //销毁在onResume()方法中的广播
    unregisterReceiver(mBroadcastReceiver);
}

Intent intent = new Intent();
//对应BroadcastReceiver中intentFilter的action
intent.setAction(BROADCAST_ACTION);
//发送广播
sendBroadcast(intent);

<receiver 
    //此广播接收者类是mBroadcastReceiver
    android:name=".mBroadcastReceiver" >
    //用于接收网络状态改变时发出的广播
    <intent-filter>
        <action android:name="BROADCAST_ACTION" />
    </intent-filter>
</receiver>

//注册应用内广播接收器
//步骤1：实例化BroadcastReceiver子类 & IntentFilter mBroadcastReceiver 
mBroadcastReceiver = new mBroadcastReceiver(); 
IntentFilter intentFilter = new IntentFilter(); 

//步骤2：实例化LocalBroadcastManager的实例
localBroadcastManager = LocalBroadcastManager.getInstance(this);

//步骤3：设置接收广播的类型 
intentFilter.addAction(android.net.conn.CONNECTIVITY_CHANGE);

//步骤4：调用LocalBroadcastManager单一实例的registerReceiver（）方法进行动态注册 
localBroadcastManager.registerReceiver(mBroadcastReceiver, intentFilter);

//取消注册应用内广播接收器
localBroadcastManager.unregisterReceiver(mBroadcastReceiver);

//发送应用内广播
Intent intent = new Intent();
// 设置Intent的Action属性
intent.setAction("org.crazyit.action.CRAZY_BROADCAST");
intent.setPackage("org.crazyit.broadcast");
intent.putExtra("msg", "简单的消息");
// 发送广播
sendBroadcast(intent);

<receiver android:name=".MyReceiver" android:enabled="true"
          android:exported="false">
    <intent-filter>
        <!-- 指定该BroadcastReceiver所响应的Intent的Action -->
        <action android:name="org.crazyit.action.CRAZY_BROADCAST" />
    </intent-filter>
</receiver>

public class MyReceiver extends BroadcastReceiver
{
	@Override
	public void onReceive(Context context, Intent intent)
	{
		Toast.makeText(context, "接收到的Intent的Action为：" + intent.getAction()
			+ "\n消息内容是：" + intent.getStringExtra("msg"),
			Toast.LENGTH_LONG).show();
	}
}