1.分类
- 普通广播
范围：整个系统
- 系统广播
范围：整个系统
- 有序广播
范围：整个系统
- 本地广播（Local Broadcast）
背景
Android中的广播可以跨App直接通信（exported对于有intent-filter情况下默认值为true）
范围：当前app
//注册应用内广播接收器
//步骤1：实例化BroadcastReceiver子类 & IntentFilter mBroadcastReceiver
mBroadcastReceiver = new BroadcastReceiver();
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();
intent.setAction(BROADCAST_ACTION);
localBroadcastManager.sendBroadcast(intent);
2.注册方式
<receiver android:name=".MyReceiver">
<intent-filter>
<action android:name="android.intent.action.MY_BROADCAST"/>
<category android:name="android.intent.category.DEFAULT" />
</intent-filter>
</receiver>
MyReceiver receiver = new MyReceiver();
IntentFilter filter = new IntentFilter();
filter.addAction("android.intent.action.MY_BROADCAST");
registerReceiver(receiver, filter);
unregisterReceiver(receiver);
