PermissionUtils Example

PermissionUtils

/**
 * Helper for accessing features related to Runtime Permissions introduced support library.
 */
public final class PermissionUtils {

    private static final String ACCESS_CAMERA_TAG = "AccessCamera";

    private PermissionUtils() {
        // Hide Constructor
    }

    /**
     * Iterate through all list of permissions and check if all permissions are granted by user.
     *
     * @param context     The Activity Context
     * @param permissions The List of Permissions
     * @return true if all permissions are granted by user. False otherwise
     */
    public static boolean isPermissionGranted(Context context, @NonNull String[] permissions) {
        for (String permission : permissions) {
            if (ContextCompat.checkSelfPermission(context, permission) !=
                    PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }

    /**
     * Iterate through all list of permissions and check if Rationale permission should be shown
     *
     * @param context     The Activity Context
     * @param permissions The List of Permissions
     * @return true if all permissions are granted by user. False otherwise
     */
    public static boolean shouldShowRequestPermissionRationale(Activity context, @NonNull String[] permissions) {
        for (String permission : permissions) {
            if (ActivityCompat.shouldShowRequestPermissionRationale(context, permission)) {
                return true;
            }
        }
        return false;
    }

    /**
     * Check that all given permissions have been granted by verifying that each entry in the given
     * array is of the value {@link PackageManager#PERMISSION_GRANTED}.
     **/
    public static boolean verifyPermissions(@NonNull int[] grantResults) {
        // At least one result must be checked.
        if (grantResults.length < 1) {
            return false;
        }

        // Verify that each required permission has been granted, otherwise return false.
        for (int result : grantResults) {
            if (result != PackageManager.PERMISSION_GRANTED) {
                return false;
            }
        }
        return true;
    }

    /**
     * Display Rationale Dialog for requested permission.
     *
     * @param context         The Activity Context
     * @param fragmentManager The fragmentManager
     * @param requestCode     Request code to identify permission type
     */
    public static void showRationaleDialog(Context context, FragmentManager fragmentManager, int requestCode) {
        String rationalMessage;
        String tag;
        if (requestCode == RequestCode.ACCESS_CAMERA) {
            tag = ACCESS_CAMERA_TAG;
            rationalMessage = context.getString(R.string.access_camera_message);

        } else {
            throw new IllegalArgumentException(
                    "Permission Request Code not allowed: " + requestCode);
        }
        final ConfirmationDialogFragment fragment = ConfirmationDialogFragment.newInstance(
                rationalMessage, null, RequestCode.ACCESS_CAMERA);
        fragment.show(fragmentManager, tag);
    }

    /**
     * This class contains Permission Groups for each Permission type.
     */
    public static final class Permissions {

        public static final String[] CAMERA = {Manifest.permission.CAMERA};

        private Permissions() {
            // hide constructor
        }
    }

    /**
     * This class contains Request Code constants for all possible runtime permissions used in the
     * application.
     */
    public static final class RequestCode {

        public static final int ACCESS_CAMERA = 101;

        private RequestCode() {
            // hide constructor
        }
    }


}