Android 使用BroadcastReceiver的几种方法

发送自定义广播

全局广播

• 发送标准广播

1.定义广播接收器.(在发送广播前,需要先定义一个广播接收器,不然发了也是白发)

public class MyBroadcastReceiver extends BroadcastReceiver {
	@Override
	public void onReceive(Context context, Intent intent) {
		Toast.makeText(context, "MyBroadcastReceiver", Toast.LENGTH_SHORT).show();
	}
}

2.在AndroidManifest.xml里面注册.这里我们会让我们定义好的广播接收器接收一条为"com.example.broadcasttest.MY_BROADCAST"的自定义广播.

<receiver      android:name="com.example.broadcasttest.MyBroadcastReceiver" >
            <intent-filter >
                <action android:name="com.example.broadcasttest.MY_BROADCAST"/>
            </intent-filter>
        </receiver>

3.然后我们写一个触发事件手动的把广播发出去.

button.setOnClickListener(new OnClickListener() {
			@Override
			public void onClick(View v) {
				Intent intent=new Intent("com.example.broadcasttest.MY_BROADCAST");
				sendBroadcast(intent);
			}
		});

• 发送有序广播

1.新建一个广播接收器.

public class MyBroadcastReceiver extends BroadcastReceiver {
	@Override
	public void onReceive(Context context, Intent intent) {
		Toast.makeText(context, "MyBroadcastReceiver", Toast.LENGTH_SHORT).show();
	}
}

2.我们在AndroidManifest.xml文件对广播进行注册.

<receiver          android:name="com.example.broadcasttest.MyBroadcastReceiver" >
            <intent-filter >
                <action android:name="com.example.broadcasttest.MY_BROADCAST"/>
            </intent-filter>
        </receiver>

3.然后我们写一个触发事件手动的把广播发出去.

button.setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				Intent intent=new Intent("com.example.broadcasttest.MY_BROADCAST");		sendOrderedBroadcast(intent, null);
			}
		});

看到这里一定有人让位标准广播和有序广播是相同的,其实不是.sendOrderedBroadcast(intent, null);"这里我们的方法该成了sendOrderedBroadcast();还有不要忘记了这个时候我们发送的是有序广播,有序广播是可以截断的.优先级高的广播接收器可以截断广播,以阻止其继续传播.

• 设置广播接收器的优先级,android:priority="";

<receiver 
 android:name="com.example.broadcasttest.MyBroadcastReceiver" >
            <intent-filter android:priority="100">
                <action android:name="com.example.broadcasttest.MY_BROADCAST"/>
            </intent-filter>
        </receiver>

• 截断广播

@Override
	public void onReceive(Context context, Intent intent) {
		abortBroadcast();	//截断广播
	}

使用本地广播

public class MainActivity extends Activity {
	private IntentFilter intentFilter;
	private Button button;
	private LocalBroadcastManager localBroadcastManager;
	private LocalReceiver localReceiver;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		requestWindowFeature(Window.FEATURE_NO_TITLE);
		setContentView(R.layout.activity_main);
		localBroadcastManager=LocalBroadcastManager.getInstance(this);	//获取实例
		button=(Button) findViewById(R.id.btn);
		button.setOnClickListener(new OnClickListener() {
		
			@Override
			public void onClick(View v) {
				Intent intent=new Intent("com.example.broadcasttest.LOCAL_BROADCAST");
				localBroadcastManager.sendBroadcast(intent);	//发送本地广播
			}
		});
		intentFilter=new IntentFilter();
		intentFilter.addAction("com.example.broadcasttest.LOCAL_BROADCAST");
		localReceiver=new LocalReceiver();
		localBroadcastManager.registerReceiver(localReceiver, intentFilter);	//注册本地广播监听器
	}
	
	@Override
	protected void onDestroy() {
		super.onDestroy();
		localBroadcastManager.unregisterReceiver(localReceiver);
	}
	
	
	class LocalReceiver extends BroadcastReceiver{
	
		@Override
		public void onReceive(Context context, Intent intent) {
			Toast.makeText(context, "1", Toast.LENGTH_LONG).show();
		}
	}
}

可以看到他和我们的上面提到的差不多.只不过现在是首先通过LocalBroadcastManager的getInstance(this);得到它的实例,然后在注册广播接收器的时候调用的是localBroadcastManager的registerReceiver();方法.在发送广播的时候调用的是localBroadcastManager的sendBroadcast(intent);方法.