Java tutorial
//package com.java2s; /** * Copyright 2016 Bryan Kelly * * 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.annotation.SuppressLint; import android.app.Activity; import android.os.Build; import android.support.annotation.Nullable; public class Main { @SuppressLint("NewApi") public static boolean isActivityValid(@Nullable final Activity activity) { if (activity == null) { return false; } else { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) { return !activity.isFinishing() && !activity.isDestroyed(); } else { return !activity.isFinishing(); } } } }