android - LocationServices.SettingsApi 使用 RESULT_CANCELED 调用 onActivityResult？

Question

在一种特殊情况下，我一直在努力使用新的 LocationServices.SettingsApi。我已经在 SplashActivity 上编写了用于位置设置的代码(自动打开 GPS 的 Google GPS 对话框)它在 Lollipop 上运行完美，但在 Kitkat 或 Jelly Bean 等较低版本中它不显示谷歌对话框它在 onActivityResult 中显示 RESULT_CANCELED .. :(

心理急救Google 对话框图片代码 fragment Google Dialog Box for automatically turning GPS on

if(googleApiClient == null) {

        googleApiClient = new GoogleApiClient.Builder(MapsActivity.this)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this).build();
        googleApiClient.connect();

        LocationRequest locationRequest = LocationRequest.create();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        locationRequest.setInterval(30 * 1000);
        locationRequest.setFastestInterval(5 * 1000);
        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(locationRequest);

        //**************************
        builder.setAlwaysShow(true); //this is the key ingredient
        //**************************

        PendingResult<LocationSettingsResult> result =
                LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build());
        result.setResultCallback(new ResultCallback<LocationSettingsResult>() {
            @Override
            public void onResult(LocationSettingsResult result) {
                final Status status = result.getStatus();
                final LocationSettingsStates state = result.getLocationSettingsStates();
                switch (status.getStatusCode()) {
                    case LocationSettingsStatusCodes.SUCCESS:
                        // All location settings are satisfied. The client can initialize location
                        // requests here.
                        break;
                    case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                        // Location settings are not satisfied. But could be fixed by showing the user
                        // a dialog.
                        try {
                            // Show the dialog by calling startResolutionForResult(),
                            // and check the result in onActivityResult().
                            status.startResolutionForResult(
                                   MapsActivity.this, 1000);
                        } catch (IntentSender.SendIntentException e) {
                            // Ignore the error.
                        }
                        break;
                    case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                        // Location settings are not satisfied. However, we have no way to fix the
                        // settings so we won't show the dialog.
                        break;
                }
            }
        });             }

上面的代码是自动开启gps的

下面是onActivityResult的代码

@Override

protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    LatLng currentLoc = LocationProvider.currentLoc;

    switch (resultCode) {
        case Activity.RESULT_OK:
            mLastLocation = LocationServices.FusedLocationApi.getLastLocation(googleApiClient);
            if(mLastLocation!=null)
            {
                currentLoc = new LatLng(mLastLocation.getLatitude(), mLastLocation.getLongitude());
            }

            Log.e(TAG, "RESULT OK");
            break;
        case Activity.RESULT_CANCELED:
            checkGPSstatus();
            Log.e(TAG, "RESULT_CANCELED");
            break;
        default:
            break;
    }

Answer 1

让我们来猜一猜。您是否为您的 Activity 将 launchMode 设置为 singleInstance？如果是这样，则您不允许其他 Activity 成为您任务的一部分。