/**
         * Requests permission.
         *
         * @param activity
         * @param requestCode request code, e.g. if you need request CAMERA permission,parameters is PermissionUtils.CODE_CAMERA
         */
        public static void requestPermission(final Activity activity, final int requestCode, PermissionGrant permissionGrant) {
            if (activity == null) {
                return;
            }

            Log.i(TAG, "requestPermission requestCode:" + requestCode);
            if (requestCode < 0 || requestCode >= requestPermissions.length) {
                Log.w(TAG, "requestPermission illegal requestCode:" + requestCode);
                return;
            }

            final String requestPermission = requestPermissions[requestCode];

            //如果是6.0以下的手机，ActivityCompat.checkSelfPermission()会始终等于PERMISSION_GRANTED，
        // 但是，如果用户关闭了你申请的权限(如下图，在安装的时候，将一些权限关闭了)，ActivityCompat.checkSelfPermission()则可能会导致程序崩溃(java.lang.RuntimeException: Unknown exception code: 1 msg null)，
        // 你可以使用try{}catch(){},处理异常，也可以判断系统版本，低于23就不申请权限，直接做你想做的。permissionGrant.onPermissionGranted(requestCode);
//        if (Build.VERSION.SDK_INT < 23) {
//            permissionGrant.onPermissionGranted(requestCode);
//            return;
//        }

            int checkSelfPermission;
            try {
                checkSelfPermission = ActivityCompat.checkSelfPermission(activity, requestPermission);
            } catch (RuntimeException e) {
                Toast.makeText(activity, "please open this permission", Toast.LENGTH_SHORT)
                        .show();
                Log.e(TAG, "RuntimeException:" + e.getMessage());
                return;
            }

            if (checkSelfPermission != PackageManager.PERMISSION_GRANTED) {
                Log.i(TAG, "ActivityCompat.checkSelfPermission != PackageManager.PERMISSION_GRANTED");

                if (ActivityCompat.shouldShowRequestPermissionRationale(activity, requestPermission)) {
                    Log.i(TAG, "requestPermission shouldShowRequestPermissionRationale");
                    shouldShowRationale(activity, requestCode, requestPermission);

                } else {
                    Log.d(TAG, "requestCameraPermission else");
                    ActivityCompat.requestPermissions(activity, new String[]{requestPermission}, requestCode);
                }

            } else {
                Log.d(TAG, "ActivityCompat.checkSelfPermission ==== PackageManager.PERMISSION_GRANTED");
                Toast.makeText(activity, "opened:" + requestPermissions[requestCode], Toast.LENGTH_SHORT).show();
//得到权限的时候，就可以在回调里面做你想做的事情了
                permissionGrant.onPermissionGranted(requestCode);
            }
        }

 /**
     * 一次申请多个权限
     */
    public static void requestMultiPermissions(final Activity activity, PermissionGrant grant) {

        final List<String> permissionsList = getNoGrantedPermission(activity, false);
        final List<String> shouldRationalePermissionsList = getNoGrantedPermission(activity, true);

        //TODO checkSelfPermission
        if (permissionsList == null || shouldRationalePermissionsList == null) {
            return;
        }
        Log.d(TAG, "requestMultiPermissions permissionsList:" + permissionsList.size() + ",shouldRationalePermissionsList:" + shouldRationalePermissionsList.size());

        if (permissionsList.size() > 0) {
            ActivityCompat.requestPermissions(activity, permissionsList.toArray(new String[permissionsList.size()]),
                    CODE_MULTI_PERMISSION);
            Log.d(TAG, "showMessageOKCancel requestPermissions");

        } else if (shouldRationalePermissionsList.size() > 0) {
            showMessageOKCancel(activity, "should open those permission",
                    new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                            ActivityCompat.requestPermissions(activity, shouldRationalePermissionsList.toArray(new String[shouldRationalePermissionsList.size()]),
                                    CODE_MULTI_PERMISSION);
                            Log.d(TAG, "showMessageOKCancel requestPermissions");
                        }
                    });
        } else {
            grant.onPermissionGranted(CODE_MULTI_PERMISSION);
        }

    }