Android 6.0系统动态请求系统相机权限

 private static final int TAKE_PHOTO_REQUEST_CODE = 1;

     public static String takePhoto(Context context, int requestCode) {
         String filePath = "";
         if (ContextCompat.checkSelfPermission(context,
                 Manifest.permission.CAMERA)
                 != PackageManager.PERMISSION_GRANTED) {
             ActivityCompat.requestPermissions((Activity) context,
                     new String[]{Manifest.permission.CAMERA},
                     TAKE_PHOTO_REQUEST_CODE);
         } else {
             Intent intent = new Intent(
                     MediaStore.ACTION_IMAGE_CAPTURE, null);
             filePath = AppApplication.getInstance().getCachePath() + File.separator + MD5.md5(String.valueOf(System.currentTimeMillis())) + "camera" + ".png";
             intent.putExtra(MediaStore.EXTRA_OUTPUT, Uri
                     .fromFile(new File(filePath)));
             ((Activity) context).startActivityForResult(intent, requestCode);

         }
         return filePath;
     }