isGooglePlayServicesAvailable和LocationClient

Question

无论如何，使用System -> Settings -> Location或GooglePlayServices来确定手机（LocationClient）是否已禁用位置服务？

Answer 1

我觉得我来不及回答这个问题。但没关系。因此，使用新的API LocationSettingsRequest，我们只需点击一下即可在应用中启用位置。 所以这样做;初始化GoogleApiClient

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

然后将LocationRequest初始化如下：

LocationRequest mLocationRequest = LocationRequest.create();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(Util.UPDATE_INTERVAL_IN_MILLISECONDS);
        mLocationRequest.setFastestInterval(Util.FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);
    }

现在通过LocationSettingsRequest进行位置设置请求。

LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(mLocationRequest);

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

        PendingResult<LocationSettingsResult> result =
                LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());
        result.setResultCallback(locationSettingsResultCallback);

所以，只要你创建了LocationSettingsRequest，它就会弹出一个这样的对话框：

因此，要处理用户选择的任何选项，您必须实现回调以处理每个选项，如下所示：

ResultCallback<LocationSettingsResult> locationSettingsResultCallback = 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.
                    //startLocationUpdates();


                    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(
                                PickupLocationActivity.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;
            }
        }
    };

参考： https://developers.google.com/android/reference/com/google/android/gms/location/SettingsApi