Java tutorial
//package com.java2s; /* * Copyright (C) 2017 grandcentrix GmbH * 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. */ import android.support.annotation.Nullable; public class Main { @Nullable public static Class<?> getInterfaceOfClassExtendingGivenInterface(final Class<?> possibleExtendingClass, final Class<?> givenInterface) { if (!givenInterface.isAssignableFrom(possibleExtendingClass)) { // not possible return null; } // assignable, find the interface Class<?> viewClass = possibleExtendingClass; while (viewClass != null) { final Class<?>[] interfaces = viewClass.getInterfaces(); for (final Class<?> clazz : interfaces) { if (givenInterface.isAssignableFrom(clazz)) { return clazz; } } // check super viewClass = viewClass.getSuperclass(); } // should never happen return null; } }