Question

这是可选分配的一部分。我有一个Activity动态注册一个广播接收器，并启动一个IntentService。广播接收器应该在执行其工作后从IntentService接收该意图。但是，在IntentService发送广播之后，不会调用onReceive。

我正在记录输出，并且我收到的最后一条日志是IntentService发送广播后的结果。之后，我不知道如何继续调试。

请咨询。

我的代码有什么问题，使得没有调用onReceive（）方法？

编辑：答案（来自HeyAlex）

IntentService正在通过LocalBroadcastManager发送广播，而由Activity启动的广播接收器未注册到LocalBroadcastManager实例，而是正常的动态寄存器。因此，广播接收方没有选择发送的广播。

DownloadAtomFeedService（扩展IntentService）

  @Override
public void onHandleIntent(Intent intent) {
    List<Entry> entries = downloadAtomFeed(uri.toString());

    int requestCode = intent.getExtras().getInt(REQUEST_CODE);

    sendEntries((ArrayList<Entry>) entries,uri,requestCode);
    Log.d(TAG, "onHandleIntent: returning to MainActivity");
}


private void sendEntries(ArrayList<Entry> entries,
                         Uri url,
                         int requestCode) {

    Bundle bundle = makeReplyBundle(entries,url,requestCode);

    Intent intent = new MainActivity().makeBroadcastReceiverIntent();
    intent.putExtras(bundle);
    LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(intent);
    Log.d(TAG, "sendEntries: SENT BROADCAST");
}

private Bundle makeReplyBundle(ArrayList<Entry> entries,
                               Uri url,
                               int requestCode) {

    Bundle data = new Bundle();

    data.putParcelableArrayList(ENTRY_ARRAY_KEY,entries);

    data.putInt(REQUEST_CODE,requestCode);

    data.putString(FEED_URL,url.toString());

    if(entries == null){
        data.putInt(DOWNLOAD_RESULTS,Activity.RESULT_CANCELED);
    }else data.putInt(DOWNLOAD_RESULTS,Activity.RESULT_OK);

    return data;
}

MainActivity

@Override
protected void onResume() {
    super.onResume();

    IntentFilter intentFilter = new IntentFilter(DownloadStateReceiver.BROADCAST_ACTION);

    DownloadStateReceiver mDownloadStateReceiver = new DownloadStateReceiver();

    registerReceiver(mDownloadStateReceiver,intentFilter);
    android.util.Log.d(TAG, "onResume: downloadstatereceiver registered");
}

@Override
protected void onPause() {
    LocalBroadcastManager.getInstance(getApplicationContext()).unregisterReceiver(mDownloadStateReceiver);

    super.onPause();
}


public static Intent makeBroadcastReceiverIntent() {

    Intent intent = new Intent().setAction(DownloadStateReceiver.BROADCAST_ACTION);
    return intent;
}


public class DownloadStateReceiver extends BroadcastReceiver {
   public static final String BROADCAST_ACTION =
            "myassignment.activities.BROADCAST";

    public DownloadStateReceiver() {
        android.util.Log.d(TAG, "DownloadStateReceiver: ");
    }

public void onReceive(Context context, Intent intent) {

        MainActivity.this.serviceIntentReceived(intent.getExtras());
        android.util.Log.d(TAG, "onReceive: BroadcastReceived");
    }
}

Answer 1

问题是您不是通过LocalBroadcastManager注册BroadcastReceiver。只需将您的onResume设置为：

 @Override
 protected void onResume() {
    super.onResume();
    IntentFilter intentFilter = new IntentFilter(DownloadStateReceiver.BROADCAST_ACTION);
    mDownloadStateReceiver = new DownloadStateReceiver();
    LocalBroadcastManager.getInstance(this).registerReceiver(mDownloadStateReceiver,intentFilter);
    android.util.Log.d(TAG, "onResume: downloadstatereceiver registered");
}

动态注册广播接收器的onReceive（）挂钩方法未调用

1 个答案: