一、BroadcastReceiver解析

（1）廣播注冊使用

public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String name = intent.getStringExtra("name");
    }
}

（2）動態注冊廣播

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);//注冊廣播
    }

    //發送廣播
    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);//注解廣播
    }
}

（3）在配置文件中靜態注冊廣播

<receiver android:name=".類名">
    <intent-filter>
        <action android:name="android.intent.action.MY_BROADCAST_RECEIVER"/>
    </intent-filter>
</receiver>

特點：動態注冊廣播接收器特點是當用來注冊的Activity關掉后，廣播也就失效了。靜態注冊無需擔憂廣播接收器是否被關閉，只要設備是開啟狀態，廣播接收器也是打開著的

（4）其他廣播

• 有序廣播：將sendBroadcast改成sendOrderedBroadcast。priority接收廣播的優先級
• 系統廣播：
  屏幕被關閉：Intent.ACTION_SCREEN_OFF
  屏幕被打開：Intent.ACTION_SCREEN_ON
  系統啟動完成：Intent.ACTION_BOOT_COMPLETED
  網絡變化：android.net.conn.CONNECTIVITY_CHANGE
  充電時或電量發生變化：Intent.ACTION_BATTERY_CHANGED
• 本地廣播：只有動態注冊的廣播才能使用，主要使用了一個LocalBroadcastManager來對廣播進行管理，并提供了相應的發送廣播和注冊廣播接收器的方法

LocalBroadcastManager localBroadcastManager = LocalBroadcastManager.getInstance(this);
//注冊廣播
localBroadcastManager.registerReceiver(myBroadcastReceiver,intentFilter);
//發送廣播
localBroadcastManager.sendBroadcast(intent);
//反注冊廣播
localBroadcastManager.unregisterReceiver(myBroadcastReceiver);

• 粘性廣播：.sendStickyBroadcast發送粘性廣播，廣播會一直滯留，當有匹配該廣播的接收器被注冊后，該接收器就會收到此條廣播。sendStickyBroadcast只保留最后一條廣播，并且一直保留。如果只想處理一遍該廣播，可通過removeStickyBroadcast來實現。
  BroadcastReceiver源碼解析