什么时候OnResult在应用程序中调用?(ResultCallback)

Question

我开始与谷歌的地方api，我试图得到设备的当前位置，这就是我所做的到目前为止，但我不能弄清楚如何以及何时OnResult内部的代码被调用，因为它里面的日志没有打印在logcat:

Log.d("2^^check1111","nside : beforee");
    try {
        if (ActivityCompat.checkSelfPermission(getActivity().getApplicationContext(), android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            Log.d("2here now","yoyo0");
            ActivityCompat.requestPermissions(getActivity(), new String[] {Manifest.permission.ACCESS_FINE_LOCATION}, 123);
        }
        Log.d("999here now","yoyo0");
        PendingResult<PlaceLikelihoodBuffer> result =  Places.PlaceDetectionApi.getCurrentPlace(mGoogleApiClient, null);
        Log.d("888here now","after result");
        result.setResultCallback(new ResultCallback<PlaceLikelihoodBuffer>() {
            @Override
            public void onResult(@NonNull PlaceLikelihoodBuffer likelyPlaces) {
             //    utils.showLog(TAG, "" + likelyPlaces.getCount());
               /// Toast.makeText(getActivity().getApplicationContext(),"inside : onResult",Toast.LENGTH_LONG).show();
                Log.d("2^^check","nside : onResul");
                if (likelyPlaces.getCount() > 0) {

                //    Toast.makeText(getActivity().getApplicationContext(),"inside :likely >0",Toast.LENGTH_LONG).show();
                    Log.d("2^^check2","nside :likely >0");
                    PlaceLikelihood placeLikelihood = likelyPlaces.get(0);
                    //                String content = "";
                    if (placeLikelihood != null && placeLikelihood.getPlace() != null && !TextUtils.isEmpty(placeLikelihood.getPlace().getName())) {
                        Log.d("2^^check3","nside : placelikelihood not nu");
                    //    Toast.makeText(getActivity().getApplicationContext(),"inside : placelikelihood not null",Toast.LENGTH_LONG).show();
   LatLng FromLatLng = placeLikelihood.getPlace().getLatLng();
                        Log.d("2^^check4","4444"+FromLatLng);
                     //   Toast.makeText(getActivity().getApplicationContext(),"inside : latlng :"+FromLatLng,Toast.LENGTH_LONG).show();
                        newLatLng = FromLatLng;
                        FromLat = FromLatLng.latitude;
                        FromLng = FromLatLng.longitude;
                    }
                } else {
       Toast.makeText(getActivity(), "Auto Location can't fetch", Toast.LENGTH_SHORT).show();
                }
                likelyPlaces.release();
            }
        });
    } catch (Exception e) {
        e.printStackTrace();
    }
}

Answer 1

您需要注册一个API密钥，否则将不会显示结果。

此处注册:https://developers.google.com/places/android-api/signup

然后在你的AndroidManifest.xml中，包括:

<application>
  ...
  <meta-data
      android:name="com.google.android.geo.API_KEY"
      android:value="YOUR_API_KEY"/>
</application>

编辑:

因此，我将您的代码添加到一个新项目中，并看到onResult()从未执行。然而，经过一些修改，我能够让它工作。

首先，我将我的活动设置为FragmentActivity

然后我像这样使用GoogleApiClient.Builder():

final GoogleApiClient mGoogleApiClient = new GoogleApiClient.Builder(this)
    .addApi(Places.PLACE_DETECTION_API)
    .addApi(Places.GEO_DATA_API)
    .enableAutoManage(this, this)
    .build();

这样做之后，我看到onResult()现在正在执行

Answer 2

您需要在AndroidManifest.xml中设置ACCESS_FINE_LOCATION权限集。如果没有设置，位置数据将不可用，结果将永远不会发布。