发送标准广播

  先定义一个BroadcastReceiver来准备接收广播，新建一个MyBroadcastReceiver。

public class MyBroadcastReceiver extends BroadcastReceiver {

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

  在AndroidManifest.xml中对BroadcastReceiver进行修改。

<receiver
	android:name=".MyBroadcastReceiver"
    android:enabled="true"
    android:exported="true">
    <intent-filter>
    	<!--让MyBroadcastReceiver接收一条值为com.example.broadcasttest.MY_BROADCAST的广播-->
        <action android:name="android.intent.action.MY_BROADCAST" />
	</intent-filter>
</receiver>

  修改activity_main.xml中的代码。

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/main"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/button"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Send Broadcast"
        />
</LinearLayout>

  修改MainActivity中的代码。

	@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                Intent intent = new Intent("com.example.broadcasttest.MY_BROADCAST");
                intent.setComponent(new ComponentName("com.example.broadcasttest", "com.example.broadcasttest.MyBroadcastReceiver"));
                sendBroadcast(intent);
            }
        });
    }

发送有序广播

  新建一个项目，创建AnotherBroadcastReceiver。

public class AnotherBroadcastReceiver extends BroadcastReceiver {

    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "received in AnotherBroadcastReceiver", Toast.LENGTH_SHORT).show();
    }
}

  在AndroidManifest.xml中对这个BroadcastReceiver的配置进行修改。

		<receiver
            android:name=".AnotherBroadcastReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.example.broadcasttest.MY_BROADCAST" />
            </intent-filter>
        </receiver>

  AnotherBroadcastReceiver同样接收的是com.example.broadcasttest.MY_BROADCAST这条广播。现在重新运行程序，并点击“Send Broadcast”按钮，就会分别弹出两次提示信息。

  修改BroadcastTest项目中MainActivity的代码。

@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                Log.d(TAG, "onClick: ");
                Intent intent = new Intent("com.example.broadcasttest.MY_BROADCAST");
                intent.setComponent(new ComponentName("com.example.broadcasttest", "com.example.broadcasttest.MyBroadcastReceiver"));
                // 修改代码
                sendOrderedBroadcast(intent, null);
                // --------
            }
        });
    }

  发送有序广播只需要改动一行代码，将sendBroadcast()方法改成sendOrderedBroadcast()方法。sendOrderedBroadcast()方法接收两个参数：第一个参数仍然是Intent；第二个参数是一个与权限相关的字符串，这里传入null就行了。

		<receiver
            android:name=".MyBroadcastReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter android:priority="100">
                <!--让MyBroadcastReceiver接收一条值为com.example.broadcasttest.MY_BROADCAST的广播-->
                <action android:name="android.intent.action.MY_BROADCAST" />
            </intent-filter>
        </receiver>

  通过android:priority属性给BroadcastReceiver设置优先级，优先级比较高的BroadcastReceiver就可以先收到广播。这里将MyBroadcastReceiver的优先级设成了100，以保证它一定会在AnotherBroadcastReceiver之前收到广播。

public class MyBroadcastReceiver extends BroadcastReceiver {
    private static final String TAG = "MyBroadcastReceiver";
    @Override
    public void onReceive(Context context, Intent intent) {
        Log.d(TAG, "onReceive: receive in MyBroadcastReceiver");
        Toast.makeText(context, "received in MyBroadcastReceiver", Toast.LENGTH_SHORT).show();
        abortBroadcast();
    }
}

  再在MyBroadcastReceiver中使用了abortBroadcast()方法将这条广播截断，后面的BroadcastReceiver将无法再接收到这条广播。重新运行程序，并点击“Send Broadcast”按钮，此时只有MyBroadcastReceiver中的Toast信息能够弹出，说明这条广播经过MyBroadcastReceiver之后确实终止传递了。