content: /*
   * Copyright 2017 Google Inc. All Rights Reserved.
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package com.google.ar.core.examples.java.helloar;
  
  import android.Manifest;
  import android.app.Activity;
  import android.content.Intent;
  import android.content.pm.PackageManager;
  import android.net.Uri;
  import android.provider.Settings;
  import android.support.v4.app.ActivityCompat;
  import android.support.v4.content.ContextCompat;
  
  /**
   * Helper to ask camera permission.
   */
  public class CameraPermissionHelper {
      private static final int CAMERA_PERMISSION_CODE = 0;
      private static final String CAMERA_PERMISSION = Manifest.permission.CAMERA;
  
      /**
       * Check to see we have the necessary permissions for this app.
       */
      public static boolean hasCameraPermission(Activity activity) {
          return ContextCompat.checkSelfPermission(activity, CAMERA_PERMISSION)
                  == PackageManager.PERMISSION_GRANTED;
      }
  
      /**
       * Check to see we have the necessary permissions for this app, and ask for them if we don't.
       */
      public static void requestCameraPermission(Activity activity) {
          ActivityCompat.requestPermissions(
                  activity, new String[]{CAMERA_PERMISSION}, CAMERA_PERMISSION_CODE);
      }
  
      /**
       * Check to see if we need to show the rationale for this permission.
       */
      public static boolean shouldShowRequestPermissionRationale(Activity activity) {
          return ActivityCompat.shouldShowRequestPermissionRationale(activity, CAMERA_PERMISSION);
      }
  
      /**
       * Launch Application Setting to grant permission.
       */
      public static void launchPermissionSettings(Activity activity) {
          Intent intent = new Intent();
          intent.setAction(Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
          intent.setData(Uri.fromParts("package", activity.getPackageName(), null));
          activity.startActivity(intent);
      }
  }
  