/**
 * Checks whether your app has a given permission and whether the app op
 * that corresponds to this permission is allowed.
 *
 * @param context Context for accessing resources.
 * @param permission The permission to check.
 * @return The permission check result which is either {@link #PERMISSION_GRANTED}
 *     or {@link #PERMISSION_DENIED} or {@link #PERMISSION_DENIED_APP_OP}.
 */
public static int checkSelfPermission(@NonNull Context context,
        @NonNull String permission) {
    return checkPermission(context, permission, android.os.Process.myPid(),
            android.os.Process.myUid(), context.getPackageName());
}
/**
 * Checks whether a given package in a UID and PID has a given permission
 * and whether the app op that corresponds to this permission is allowed.
 *
 * @param context Context for accessing resources.
 * @param permission The permission to check.
 * @param pid The process id for which to check.
 * @param uid The uid for which to check.
 * @param packageName The package name for which to check. If null the
 *     the first package for the calling UID will be used.
 * @return The permission check result which is either {@link #PERMISSION_GRANTED}
 *     or {@link #PERMISSION_DENIED} or {@link #PERMISSION_DENIED_APP_OP}.
 */
public static int checkPermission(@NonNull Context context, @NonNull String permission,
        int pid, int uid, String packageName) {
    if (context.checkPermission(permission, pid, uid) == PackageManager.PERMISSION_DENIED) {
        return PERMISSION_DENIED;
    }
    String op = AppOpsManagerCompat.permissionToOp(permission);
    if (op == null) {
        return PERMISSION_GRANTED;
    }
    if (packageName == null) {
        String[] packageNames = context.getPackageManager().getPackagesForUid(uid);
        if (packageNames == null || packageNames.length <= 0) {
            return PERMISSION_DENIED;
        }
        packageName = packageNames[0];
    }
    if (AppOpsManagerCompat.noteProxyOp(context, op, packageName)
            != AppOpsManagerCompat.MODE_ALLOWED) {
        return PERMISSION_DENIED_APP_OP;
    }
    return PERMISSION_GRANTED;
}