Home | History | Annotate | Download | only in multipropertyanimations 
      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 package com.example.android.multipropertyanimations;
     18 
     19 import android.animation.ObjectAnimator;
     20 import android.animation.PropertyValuesHolder;
     21 import android.animation.ValueAnimator;
     22 import android.animation.ValueAnimator.AnimatorUpdateListener;
     23 import android.app.Activity;
     24 import android.os.Bundle;
     25 import android.view.View;
     26 
     27 /**
     28  * This example shows various ways of animating multiple properties in parallel.
     29  *
     30  * Watch the associated video for this demo on the DevBytes channel of developer.android.com
     31  * or on the DevBytes playlist in the androiddevelopers channel on YouTube at
     32  * https://www.youtube.com/playlist?list=PLWz5rJ2EKKc_XOgcRukSoKKjewFJZrKV0.
     33  */
     34 public class MultiPropertyAnimations extends Activity {
     35 
     36     private static final float TX_START = 0;
     37     private static final float TY_START = 0;
     38     private static final float TX_END = 400;
     39     private static final float TY_END = 200;
     40 
     41     @Override
     42     protected void onCreate(Bundle savedInstanceState) {
     43         super.onCreate(savedInstanceState);
     44         setContentView(R.layout.activity_multi_property_animations);
     45     }
     46 
     47     /**
     48      * A very manual approach to animation uses a ValueAnimator to animate a fractional
     49      * value and then turns that value into the final property values which are then set
     50      * directly on the target object.
     51      */
     52     public void runValueAnimator(final View view) {
     53         ValueAnimator anim = ValueAnimator.ofFloat(0, 400);
     54         anim.addUpdateListener(new AnimatorUpdateListener() {
     55             @Override
     56             public void onAnimationUpdate(ValueAnimator animator) {
     57                 float fraction = animator.getAnimatedFraction();
     58                 view.setTranslationX(TX_START + fraction * (TX_END - TX_START));
     59                 view.setTranslationY(TY_START + fraction * (TY_END - TY_START));
     60             }
     61         });
     62         anim.start();
     63     }
     64 
     65     /**
     66      * ViewPropertyAnimator is the cleanest and most efficient way of animating
     67      * View properties, even when there are multiple properties to be animated
     68      * in parallel.
     69      */
     70     public void runViewPropertyAnimator(View view) {
     71         view.animate().translationX(TX_END).translationY(TY_END);
     72     }
     73 
     74     /**
     75      * Multiple ObjectAnimator objects can be created and run in parallel.
     76      */
     77     public void runObjectAnimators(View view) {
     78         ObjectAnimator.ofFloat(view, View.TRANSLATION_X, TX_END).start();
     79         ObjectAnimator.ofFloat(view, View.TRANSLATION_Y, TY_END).start();
     80         // Optional: use an AnimatorSet to run these in parallel
     81     }
     82 
     83     /**
     84      * Using PropertyValuesHolder objects enables the use of a single ObjectAnimator
     85      * per target, even when there are multiple properties being animated on that target.
     86      */
     87     public void runObjectAnimator(View view) {
     88         PropertyValuesHolder pvhTX = PropertyValuesHolder.ofFloat(View.TRANSLATION_X, TX_END);
     89         PropertyValuesHolder pvhTY = PropertyValuesHolder.ofFloat(View.TRANSLATION_Y, TY_END);
     90         ObjectAnimator.ofPropertyValuesHolder(view, pvhTX, pvhTY).start();
     91     }
     92 }
     93