Android BroadcastReceiver 永远不会被调用

Question

大家好，感谢您的帮助!我将从代码开始
所以，带有广播接收器的类是这样的:

public class MyService extends Service {

    // ...
    // ACTION
    public static final String action = "com.mywebsite.myapp.package.class.action";
    // ...
    public void onCreate() {
        // SET BROADCAST RECEIVER
        broadcastReceiver = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                Log.w("broadcast receiver", "action: " + action);
                if (action.equals("**")) {
                    Log.w("broadcast receiver", "**");
                }
            }
        };
        // REGISTER BROADCAST
        final IntentFilter myFilter = new IntentFilter();
        myFilter.addAction(action);
        registerReceiver(this.broadcastReceiver, myFilter);
    }
    // ....
}

然后我尝试从 fragment 以这种方式发送广播

Intent myIntent = new Intent(getActivity()
        .getApplicationContext(), MediaPlayerService.class);
getActivity().startService(myIntent);
myIntent = new Intent(getActivity().getApplicationContext(),
        MediaPlayerService.class);
myIntent.setAction(MyService.action);
myIntent.putExtra("data", "*******");
getActivity().sendBroadcast(myIntent);

但是广播接收器永远不会被调用。我可以这样说是因为 logcat:Log.w("broadcast receiver", "action: "+ action);永远不会被调用。我该如何解决？

谢谢!

编辑:类代码:

public class MediaPlayerService extends Service {

    private MediaPlayer mediaPlayer = null;
    private AudioManager audioManager;
    private BroadcastReceiver broadcastReceiver;
    private String absoluteFilePath;
    private Boolean areThereAnyErrors = false;
    private int savedVolume;
    // ACTIONS
    public static final String prepareAndPlayNewFile = "com.disgustingapps.player.AudioManagement.MediaPlayerService.prepareAndPlayNewFile";

    @Override
    public void onCreate() {
        Log.w("MediaPlayerService", "onCreate called");
        // SET BROADCAST RECEIVER
        broadcastReceiver = new BroadcastReceiver() {

            @Override
            public void onReceive(Context context, Intent intent) {
                String action = intent.getAction();
                Log.w("broadcast receiver", "action: " + action);
                if (action.equals("prepareAndPlayNewFile")) {
                    Log.w("broadcast receiver", "prepareAndPlayNewFile");
                    prepareAndPlayNewFile(intent
                            .getStringExtra("absoluteFilePath"));
                }
            }
        };
        // REGISTER BROADCAST
        final IntentFilter myFilter = new IntentFilter();
        myFilter.addAction(prepareAndPlayNewFile);
        registerReceiver(this.broadcastReceiver, myFilter);
    }

    @Override
    public void onDestroy() {
        Log.w("MediaPlayerService", "onDestroy called");
        unregisterReceiver(broadcastReceiver);
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.w("MediaPlayerService", "onStartCommand called");
        // We want this service to continue running until it is explicitly
        // stopped, so return sticky.
        return START_STICKY;
    }

    public void prepareAndPlayNewFile(String absoluteFilePath) {
        // ...do something...
    }
}

Answer 1

没有看到服务的代码以及它是如何启动的，很难判断问题出在哪里..

首先，您在服务的 onCreate 中注册接收器，但没有注销事件。您应该将广播接收器放在服务类的全局范围内，并在 onDestroy() 中注销(覆盖 onDestroy 和记录一条消息以确认其停止)

其次，除非您绑定(bind)到该服务，否则该服务将在启动命令执行后立即“停止”。

您应该覆盖 onStartCommand 并返回 START_STICKY 以保持服务运行。