Java tutorial
//package com.java2s; /* * Mirror - Yet another Sketch Mirror App for Android. * Copyright (C) 2016 Zhihu Inc. * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation, either version 3 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program. If not, see <http://www.gnu.org/licenses/>. */ import android.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.TimeInterpolator; import android.view.View; public class Main { public static final int DURATION = 300; public static void showViewAlphaAnim(final View view, TimeInterpolator interpolator, final boolean visible) { if (visible && view.getVisibility() == View.VISIBLE || !visible && view.getVisibility() != View.VISIBLE) { return; } float fromAlpha = visible ? 0.0F : 1.0F; float toAlpha = visible ? 1.0F : 0.0F; view.setAlpha(fromAlpha); view.setVisibility(View.VISIBLE); view.animate().alpha(toAlpha).setDuration(DURATION).setInterpolator(interpolator) .setListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animator) { if (visible) { view.setAlpha(1.0F); view.setVisibility(View.VISIBLE); } else { view.setAlpha(0.0F); view.setVisibility(View.INVISIBLE); } } }).start(); } }