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.propertyanimations;
18 
19 import android.animation.Animator;
20 import android.animation.AnimatorInflater;
21 import android.animation.AnimatorSet;
22 import android.animation.ObjectAnimator;
23 import android.animation.PropertyValuesHolder;
24 import android.animation.ValueAnimator;
25 import android.app.Activity;
26 import android.os.Bundle;
27 import android.view.View;
28 import android.widget.Button;
29 import android.widget.CheckBox;
30 
31 /**
32  * This example shows how to use property animations, specifically ObjectAnimator, to perform
33  * various view animations. Compare this approach to that of the ViewAnimations demo, which
34  * shows how to achieve similar effects using the pre-3.0 animation APIs.
35  *
36  * Watch the associated video for this demo on the DevBytes channel of developer.android.com
37  * or on YouTube at https://www.youtube.com/watch?v=3UbJhmkeSig.
38  */
39 public class PropertyAnimations extends Activity {
40 
41     CheckBox mCheckBox;
42 
43     @Override
onCreate(Bundle savedInstanceState)44     public void onCreate(Bundle savedInstanceState) {
45         super.onCreate(savedInstanceState);
46         setContentView(R.layout.activity_property_animations);
47 
48         mCheckBox = (CheckBox) findViewById(R.id.checkbox);
49         final Button alphaButton = (Button) findViewById(R.id.alphaButton);
50         final Button translateButton = (Button) findViewById(R.id.translateButton);
51         final Button rotateButton = (Button) findViewById(R.id.rotateButton);
52         final Button scaleButton = (Button) findViewById(R.id.scaleButton);
53         final Button setButton = (Button) findViewById(R.id.setButton);
54 
55         // Fade the button out and back in
56         ObjectAnimator alphaAnimation = ObjectAnimator.ofFloat(alphaButton,
57                 View.ALPHA, 0);
58         alphaAnimation.setRepeatCount(1);
59         alphaAnimation.setRepeatMode(ValueAnimator.REVERSE);
60 
61         // Move the button over to the right and then back
62         ObjectAnimator translateAnimation =
63                 ObjectAnimator.ofFloat(translateButton, View.TRANSLATION_X, 800);
64         translateAnimation.setRepeatCount(1);
65         translateAnimation.setRepeatMode(ValueAnimator.REVERSE);
66 
67         // Spin the button around in a full circle
68         ObjectAnimator rotateAnimation =
69                 ObjectAnimator.ofFloat(rotateButton, View.ROTATION, 360);
70         rotateAnimation.setRepeatCount(1);
71         rotateAnimation.setRepeatMode(ValueAnimator.REVERSE);
72 
73         // Scale the button in X and Y. Note the use of PropertyValuesHolder to animate
74         // multiple properties on the same object in parallel.
75         PropertyValuesHolder pvhX = PropertyValuesHolder.ofFloat(View.SCALE_X, 2);
76         PropertyValuesHolder pvhY = PropertyValuesHolder.ofFloat(View.SCALE_Y, 2);
77         ObjectAnimator scaleAnimation =
78                 ObjectAnimator.ofPropertyValuesHolder(scaleButton, pvhX, pvhY);
79         scaleAnimation.setRepeatCount(1);
80         scaleAnimation.setRepeatMode(ValueAnimator.REVERSE);
81 
82         // Run the animations above in sequence
83         AnimatorSet setAnimation = new AnimatorSet();
84         setAnimation.play(translateAnimation).after(alphaAnimation).before(rotateAnimation);
85         setAnimation.play(rotateAnimation).before(scaleAnimation);
86 
87         setupAnimation(alphaButton, alphaAnimation, R.animator.fade);
88         setupAnimation(translateButton, translateAnimation, R.animator.move);
89         setupAnimation(rotateButton, rotateAnimation, R.animator.spin);
90         setupAnimation(scaleButton, scaleAnimation, R.animator.scale);
91         setupAnimation(setButton, setAnimation, R.animator.combo);
92 
93     }
94 
setupAnimation(View view, final Animator animation, final int animationID)95     private void setupAnimation(View view, final Animator animation, final int animationID) {
96         view.setOnClickListener(new View.OnClickListener() {
97             public void onClick(View v) {
98                 // If the button is checked, load the animation from the given resource
99                 // id instead of using the passed-in animation parameter. See the xml files
100                 // for the details on those animations.
101                 if (mCheckBox.isChecked()) {
102                     Animator anim = AnimatorInflater.loadAnimator(PropertyAnimations.this, animationID);
103                     anim.setTarget(v);
104                     anim.start();
105                     return;
106                 }
107                 animation.start();
108             }
109         });
110     }
111 }
112