两个应用间的广播发送与接收

有两个程序BroadcastTest1和BroadcastTest2，前者负责发送广播，后者负责接收广播

1.Broadcast2-----接受广播

Broadcast2中的广播接收器MyReceiver的onReceive()

public void onReceive(Context context, Intent intent) {
        // TODO: This method is called when the BroadcastReceiver is receiving
        // an Intent broadcast.
        Toast.makeText(context, "Received in Receiver", Toast.LENGTH_LONG).show();
    }

在Broadcast2的AndroidManifest.xml中注册广播，广播的action为 com.example.broadcasttest1.MY_BROADCAST

 <receiver 
2　　　　　　　 android:name=".MyReceiver"
            android:enabled="true"
            android:exported="true">
            <intent-filter>
                <action android:name="com.example.broadcasttest1.MY_BROADCAST" />
            </intent-filter>
        </receiver>

2.Broadcast1-----发送广播

broadcast1的布局中有一个Button用于发送广播，代码省略掉

broadcast1的MainActivity的onCreate()部分

特别注意的是sendBroadcast(intent)的前面应加上intent.setComponent()，里面具体参数如下随笔所示

i.e.关于Android8及以上版本自定义广播无法接收问题

  @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.broadcasttest1.MY_BROADCAST");
                intent.setComponent(new ComponentName("com.example.broadcasttest2", "com.example.broadcasttest2.MyReceiver"));
                sendBroadcast(intent);
            }
        });
    }

3.程序运行

BroadcastTest1运行，点击Button后运行如下