Android examples for android.animation:ValueAnimator
start ValueAnimator
/*//ww w.ja v a 2 s .c o m * Copyright (C) 2014 The Android Open Source Project * * 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.animation.ArgbEvaluator; import android.animation.ObjectAnimator; import android.animation.PropertyValuesHolder; import android.animation.TypeEvaluator; import android.animation.ValueAnimator; import android.util.Property; import android.view.View; import android.view.animation.Interpolator; import android.widget.ImageView; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; public class Main{ private static Method sAnimateValue; private static boolean sTryAnimateValue = true; public static void start(ValueAnimator... animators) { for (ValueAnimator animator : animators) { final float fraction = animator.getAnimatedFraction(); if (fraction < 1.0f) { animator.start(); setAnimatedFraction(animator, fraction); } } } public static void setAnimatedFraction(ValueAnimator animator, float fraction) { if (sTryAnimateValue) { // try to set the animated fraction directly so that it isn't affected by the // internal animator scale or time (b/17938711) try { if (sAnimateValue == null) { sAnimateValue = ValueAnimator.class.getDeclaredMethod( "animateValue", float.class); sAnimateValue.setAccessible(true); } sAnimateValue.invoke(animator, fraction); return; } catch (NoSuchMethodException | InvocationTargetException | IllegalAccessException e) { // something went wrong, don't try that again sTryAnimateValue = false; } } // if that doesn't work then just fall back to setting the current play time animator.setCurrentPlayTime(Math.round(fraction * animator.getDuration())); } }