Android发送和接收自定义Broadcast

BroadcastReceiver意为广播接收，通过它可以实现进程间通信也可以实现进程内部进行通信，对于广播的消息我们只处理感兴趣的消息，可以接收系统的广播（短信、开机）也可以接收自定义的广播，但都需要注册才能接收，注册的方式又分两种，一是在AndroidMainfest.xml中注册，二是在代码中注册。

BroadcastReceiver是一个抽象的类，我们需要继承它才能创建对象

创建一个类ReceiveMsg.java继承BroadcastReceiver，并定义两个自定义的消息

package com.example.receivermsg;import android.content.BroadcastReceiver;import android.content.Context;import android.content.Intent;public class ReceiverMsg extends BroadcastReceiver {//定义两个自定义的消息public static final String MSG = "com.example.msg";public static final String REG_MSG = "com.example.reg.msg";/** * 接收消息处理 */@Overridepublic void onReceive(Context arg0, Intent arg1) {// TODO Auto-generated method stubif(arg1.getAction().equals(MSG)){System.out.println(MSG);}else if(arg1.getAction().equals(REG_MSG)){System.out.println(REG_MSG);}}}

在AndroidMainfest.xml文件中声明

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.broadcastdemo"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="17" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="com.example.broadcastdemo.MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <!-- 定义Broadcast Receiver 指定监听的Action -->    <receiver android:name="com.example.receivermsg.ReceiverMsg">             <!-- 注册自定义的消息 -->              <intent-filter >            <action android:name="com.example.reg.msg"/>        </intent-filter>    </receiver>        </application>    <!-- 声明接收消息的权限 -->    <uses-permission android:name="android.permission.RECEIVE_SMS" >    </uses-permission></manifest>

在Activity中添加两个按钮监听器发送消息用

package com.example.broadcastdemo;import com.example.receivermsg.ReceiverMsg;import android.app.Activity;import android.content.Intent;import android.content.IntentFilter;import android.os.Bundle;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;public class MainActivity extends Activity implements OnClickListener {private Button sendMsg = null;private Button sendReg = null;private ReceiverMsg receiver = null;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);sendMsg = (Button) findViewById(R.id.sendMsg);sendReg = (Button) findViewById(R.id.sendRegMsg);sendMsg.setOnClickListener(this);sendReg.setOnClickListener(this);// 生成一个BroiadcastReceiver对象receiver = new ReceiverMsg();// 生成一个IntentFilter对象IntentFilter filter = new IntentFilter();// 为IntentFilter添加一个Actionfilter.addAction(ReceiverMsg.MSG);// 将BroadcastReceiver对象注册到系统当中registerReceiver(receiver, filter);}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}/** * 按钮监听 */@Overridepublic void onClick(View arg0) {// TODO Auto-generated method stubint id = arg0.getId(); // 用来区分点击的是哪个按钮if (id == R.id.sendMsg) {Intent intent = new Intent();intent.setAction(ReceiverMsg.MSG);sendBroadcast(intent);System.out.println("send own msg");} else if (id == R.id.sendRegMsg) {Intent intent = new Intent();intent.setAction(ReceiverMsg.REG_MSG);sendBroadcast(intent);System.out.println("send reg msg");}}}

在onReceive中接收到感兴趣的消息就可以根据需要进行处理，比如更新播放进度、更新时间等操作。

样例源码

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