Java tutorial
//package com.java2s; /** * Copyright 2016 Alex Yanchenko * * 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.app.Activity; import android.view.View; import android.view.Window; public class Main { public static View getRootView(Window w) { return w.findViewById(android.R.id.content).getRootView(); } public static <T extends View> T findViewById(View view, int id) { @SuppressWarnings("unchecked") T v = (T) view.findViewById(id); return v; } public static <T extends View> T findViewById(Activity activity, int id) { @SuppressWarnings("unchecked") T v = (T) activity.findViewById(id); return v; } }