一、BroadcastReceiver解析
（1）广播注册使用
public class MyBroadcastReceiver extends BroadcastReceiver {
@Override
public void onReceive(Context context, Intent intent) {
String name = intent.getStringExtra("name");
}
}
（2）动态注册广播
public class MainActivity extends AppCompatActivity {
private MyBroadcastReceiver myBroadcastReceiver;
private IntentFilter intentFilter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myBroadcastReceiver = new MyBroadcastReceiver();
intentFilter = new IntentFilter();
intentFilter.addAction("android.intent.action.MY_BROADCAST_RECEIVER");
registerReceiver(myBroadcastReceiver, intentFilter);//注册广播
}
//发送广播
private void sendOut(){
Intent intent = new Intent("android.intent.action.MY_BROADCAST_RECEIVER");
intent.putExtra("name","name");
sendBroadcast(intent);
}
@Override
protected void onDestroy() {
super.onDestroy();
unregisterReceiver(myBroadcastReceiver);//注解广播
}
}
（3）在配置文件中静态注册广播
<receiver android:name=".类名">
<intent-filter>
<action android:name="android.intent.action.MY_BROADCAST_RECEIVER"/>
</intent-filter>
</receiver>
特点：动态注册广播接收器特点是当用来注册的Activity关掉后，广播也就失效了。静态注册无需担忧广播接收器是否被关闭，只要设备是开启状态，广播接收器也是打开着的
（4）其他广播
- 有序广播：将sendBroadcast改成sendOrderedBroadcast。priority接收广播的优先级
- 系统广播：
屏幕被关闭：Intent.ACTION_SCREEN_OFF
屏幕被打开：Intent.ACTION_SCREEN_ON
系统启动完成：Intent.ACTION_BOOT_COMPLETED
网络变化：android.net.conn.CONNECTIVITY_CHANGE
充电时或电量发生变化：Intent.ACTION_BATTERY_CHANGED - 本地广播：只有动态注册的广播才能使用，主要使用了一个LocalBroadcastManager来对广播进行管理，并提供了相应的发送广播和注册广播接收器的方法
LocalBroadcastManager localBroadcastManager = LocalBroadcastManager.getInstance(this);
//注册广播
localBroadcastManager.registerReceiver(myBroadcastReceiver,intentFilter);
//发送广播
localBroadcastManager.sendBroadcast(intent);
//反注册广播
localBroadcastManager.unregisterReceiver(myBroadcastReceiver);
- 粘性广播：.sendStickyBroadcast发送粘性广播，广播会一直滞留，当有匹配该广播的接收器被注册后，该接收器就会收到此条广播。sendStickyBroadcast只保留最后一条广播，并且一直保留。如果只想处理一遍该广播，可通过removeStickyBroadcast来实现。
BroadcastReceiver源码解析
