如何从片段绑定服务

Question

我试图从一个片段绑定一个服务,就像我在一个活动中成功完成一样,但是当我尝试在服务上调用一个方法时,我得到一个NullPointerException - 显然是因为该服务为null.现在在onStart中绑定到服务有一些问题,或者我只是做错了？

@Override
public void onStart() {
    super.onStart();

    Intent intent = new Intent(getActivity(), LiteTrickService.class);
    getActivity().registerReceiver(receiver, new IntentFilter(LiteTrickService.BROADCAST_ACTION));
    getActivity().registerReceiver(receiver, new IntentFilter(LiteTrickService.BROADCAST_FAIL));
    getActivity().bindService(intent, mConnection, Context.BIND_AUTO_CREATE);
}

@Override
public void onStop() {
    super.onStop();
    getActivity().unbindService(mConnection);
    getActivity().unregisterReceiver(receiver);
    mBound = false;
}

编辑:抱歉.这是我没有充分考虑这个问题的错误.mConnection是一个ServiceConnection,如下所示:

private ServiceConnection mConnection = new ServiceConnection() 
{

    @Override
    public void onServiceConnected(ComponentName className,
            IBinder service) {
        // We've bound to LocalService, cast the IBinder and get LocalService instance
        LocalBinder binder = (LocalBinder) service;
        mService = binder.getService();
        mBound = true;
    }

    @Override
    public void onServiceDisconnected(ComponentName arg0) {
        mBound = false;
    }
};

堆栈跟踪 :

01-03 15:21:22.355: E/AndroidRuntime(12360): FATAL EXCEPTION: main
01-03 15:21:22.355: E/AndroidRuntime(12360): java.lang.NullPointerException
01-03 15:21:22.355: E/AndroidRuntime(12360):    at lite.hattrick.players.PlayerRankingFragment.onOptionsItemSelected(PlayerRankingFragment.java:205)

这将是抛出异常的确切位置:case POPULATE_ID:

        if (hasData) {
            return false;
        }
        if(!mBound)
            getActivity().bindService(new Intent(getActivity().getApplicationContext(), LiteTrickService.class), mConnection, Context.BIND_AUTO_CREATE);
        mService.refreshPlayers(); // Null Pointer Exception as mService is null
        pBar.setVisibility(View.VISIBLE);
        return true;

Answer 1

我解决了这个问题.原来我忘记在我的清单中提供正确的包名称的服务声明.

通过改变

<service android:name=".LiteTrickService" />

至

<service android:name="lite.hattrick.services.LiteTrickService" />

我解决了问题,现在服务按预期连接.