Broadcast

最新推荐文章于 2025-07-09 18:52:05 发布

原创最新推荐文章于 2025-07-09 18:52:05 发布 · 516 阅读

CC 4.0 BY-SA版权

本文详细介绍了Android应用程序中实现跨进程通信的方法。通过一个具体的示例，展示了如何在一个进程中发送广播，并在另一个进程中接收该广播。文章还解释了为什么跨进程接收广播需要在AndroidManifest.xml文件中进行额外配置。

// 1 send
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findViewById(R.id.send).setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                Intent intent = new Intent();
                intent.setAction("com.hello.broadcast");
                intent.putExtra("msg", "msg in send");
                sendBroadcast(intent);
            }
        });

        // 注册广播消息
        // 自己的进程，这几行代码就行了，不用配置manifest就行接收广播消息了
        IntentFilter filter = new IntentFilter("com.hello.broadcast");
        MyReceiver myReceiver = new MyReceiver();
        registerReceiver(myReceiver, filter);
    }

    private class MyReceiver extends BroadcastReceiver {

        @Override
        public void onReceive(Context context, Intent intent) {
            Toast.makeText(context, "now process is send. msg is: " + intent.getStringExtra("msg"), Toast.LENGTH_SHORT).show();
        }
    }
}

// 2.1receiver
public class MainActivity extends Activity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // 跨进程只有这几行代码不行呢，必须在manifest中配置才可以接收广播消息
        // IntentFilter filter = new IntentFilter("com.hello.broadcast");
        // MyReceiver myReceiver = new MyReceiver();
        // registerReceiver(myReceiver, filter);
    }
}

// 2.2
public class MyReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        Toast.makeText(context, "now process is receiver. msg is: " + intent.getStringExtra("msg"), Toast.LENGTH_SHORT).show();
    }
}

// 2.3
<receiver android:name=".MyReceiver" >
    <intent-filter>
        <action android:name="com.hello.broadcast" />
    </intent-filter>
</receiver>

跨进程通信