Android:我可以在不将用户重定向到设置屏幕的情况下启用GPS,就像在"谷歌地图"应用中一样

Question

在基于GPS的应用中,重要的是用户启用他的GPS.如果没有,那么通常我们会显示一个对话框,说明用户" 应该从设置启用他的GPS以便能够使用此功能 ".

当用户按下OK时,他将被重定向到Settings页面,我不喜欢这个解决方案,因为它将用户从应用程序上下文中带到了设置中.

我注意到"谷歌地图"应用程序有一个更好的解决方案,即在需要GPS功能时显示一个整洁的对话框.一旦用户选择"OK" GPS将被启用直接没有任何转向的设置.

我可以在不将用户重定向到设置屏幕的情况下启用GPS,就像在"谷歌地图"应用程序中一样吗？

看看下面的图片:

Answer 1

要获得该功能,您需要:

• 首先(至少)播放服务的7.0版本

compile 'com.google.android.gms:play-services-location:16.0.0'

• 你的代码中有这样的第二个东西(我在onCreate中有它):

-

 // Check the location settings of the user and create the callback to react to the different possibilities
LocationSettingsRequest.Builder locationSettingsRequestBuilder = new LocationSettingsRequest.Builder()
                .addLocationRequest(mLocationRequest);
PendingResult<LocationSettingsResult> result =
                LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, locationSettingsRequestBuilder.build());
result.setResultCallback(mResultCallbackFromSettings);

然后创建回调:

// The callback for the management of the user settings regarding location
private ResultCallback<LocationSettingsResult> mResultCallbackFromSettings = new ResultCallback<LocationSettingsResult>() {
    @Override
    public void onResult(LocationSettingsResult result) {
        final Status status = result.getStatus();
        //final LocationSettingsStates locationSettingsStates = 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(
                            MapActivity.this,
                            REQUEST_CHECK_SETTINGS);
                } catch (IntentSender.SendIntentException e) {
                    // Ignore the error.
                }
                break;
            case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                Log.e(TAG, "Settings change unavailable. We have no way to fix the settings so we won't show the dialog.");
                break;
        }
    }
};

然后,最后,onActivityResult我有以下内容:

/**
 * Used to check the result of the check of the user location settings
 *
 * @param requestCode code of the request made
 * @param resultCode code of the result of that request
 * @param intent intent with further information
 */
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
    //final LocationSettingsStates states = LocationSettingsStates.fromIntent(intent);
    switch (requestCode) {
        case REQUEST_CHECK_SETTINGS:
            switch (resultCode) {
                case Activity.RESULT_OK:
                    // All required changes were successfully made
                    if (mGoogleApiClient.isConnected() && userMarker == null) {
                        startLocationUpdates();
                    }
                    break;
                case Activity.RESULT_CANCELED:
                    // The user was asked to change settings, but chose not to
                    break;
                default:
                    break;
            }
            break;
    }
}