当应用程序在后台时更新UI。注销BroadcastReceiver

public class MyBroadcastReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // 在这里执行更新UI的操作
        // 可以使用Handler或者发送消息给UI线程来更新UI
    }
}

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

Intent intent = new Intent("com.example.UPDATE_UI_ACTION");
sendBroadcast(intent);