1 /*
2  * Copyright (C) 2010 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.apis.animation;
18 
19 // Need the following import to get access to the app resources, since this
20 // class is in a sub-package.
21 import android.animation.*;
22 import android.view.animation.AccelerateInterpolator;
23 import com.example.android.apis.R;
24 
25 import java.util.ArrayList;
26 
27 import android.app.Activity;
28 import android.content.Context;
29 import android.graphics.Canvas;
30 import android.graphics.Paint;
31 import android.graphics.RadialGradient;
32 import android.graphics.Shader;
33 import android.graphics.drawable.ShapeDrawable;
34 import android.graphics.drawable.shapes.OvalShape;
35 import android.os.Bundle;
36 import android.view.View;
37 import android.view.animation.BounceInterpolator;
38 import android.widget.Button;
39 import android.widget.LinearLayout;
40 
41 /**
42  * This application demonstrates the seeking capability of ValueAnimator. The SeekBar in the
43  * UI allows you to set the position of the animation. Pressing the Run button will play from
44  * the current position of the animation.
45  */
46 public class MultiPropertyAnimation extends Activity {
47 
48     private static final int DURATION = 1500;
49 
50     @Override
onCreate(Bundle savedInstanceState)51     public void onCreate(Bundle savedInstanceState) {
52         super.onCreate(savedInstanceState);
53         setContentView(R.layout.animation_multi_property);
54         LinearLayout container = (LinearLayout) findViewById(R.id.container);
55         final MyAnimationView animView = new MyAnimationView(this);
56         container.addView(animView);
57 
58         Button starter = (Button) findViewById(R.id.startButton);
59         starter.setOnClickListener(new View.OnClickListener() {
60 
61             public void onClick(View v) {
62                 animView.startAnimation();
63             }
64         });
65 
66     }
67 
68     public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener {
69 
70         private static final float BALL_SIZE = 100f;
71 
72         public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
73         AnimatorSet animation = null;
74         Animator bounceAnim = null;
75         ShapeHolder ball = null;
76 
MyAnimationView(Context context)77         public MyAnimationView(Context context) {
78             super(context);
79             addBall(50, 0);
80             addBall(150, 0);
81             addBall(250, 0);
82             addBall(350, 0);
83         }
84 
createAnimation()85         private void createAnimation() {
86             if (bounceAnim == null) {
87                 ShapeHolder ball;
88                 ball = balls.get(0);
89                 ObjectAnimator yBouncer = ObjectAnimator.ofFloat(ball, "y",
90                         ball.getY(), getHeight() - BALL_SIZE).setDuration(DURATION);
91                 yBouncer.setInterpolator(new BounceInterpolator());
92                 yBouncer.addUpdateListener(this);
93 
94                 ball = balls.get(1);
95                 PropertyValuesHolder pvhY = PropertyValuesHolder.ofFloat("y", ball.getY(),
96                         getHeight() - BALL_SIZE);
97                 PropertyValuesHolder pvhAlpha = PropertyValuesHolder.ofFloat("alpha", 1.0f, 0f);
98                 ObjectAnimator yAlphaBouncer = ObjectAnimator.ofPropertyValuesHolder(ball,
99                         pvhY, pvhAlpha).setDuration(DURATION/2);
100                 yAlphaBouncer.setInterpolator(new AccelerateInterpolator());
101                 yAlphaBouncer.setRepeatCount(1);
102                 yAlphaBouncer.setRepeatMode(ValueAnimator.REVERSE);
103 
104 
105                 ball = balls.get(2);
106                 PropertyValuesHolder pvhW = PropertyValuesHolder.ofFloat("width", ball.getWidth(),
107                         ball.getWidth() * 2);
108                 PropertyValuesHolder pvhH = PropertyValuesHolder.ofFloat("height", ball.getHeight(),
109                         ball.getHeight() * 2);
110                 PropertyValuesHolder pvTX = PropertyValuesHolder.ofFloat("x", ball.getX(),
111                         ball.getX() - BALL_SIZE/2f);
112                 PropertyValuesHolder pvTY = PropertyValuesHolder.ofFloat("y", ball.getY(),
113                         ball.getY() - BALL_SIZE/2f);
114                 ObjectAnimator whxyBouncer = ObjectAnimator.ofPropertyValuesHolder(ball, pvhW, pvhH,
115                         pvTX, pvTY).setDuration(DURATION/2);
116                 whxyBouncer.setRepeatCount(1);
117                 whxyBouncer.setRepeatMode(ValueAnimator.REVERSE);
118 
119                 ball = balls.get(3);
120                 pvhY = PropertyValuesHolder.ofFloat("y", ball.getY(), getHeight() - BALL_SIZE);
121                 float ballX = ball.getX();
122                 Keyframe kf0 = Keyframe.ofFloat(0f, ballX);
123                 Keyframe kf1 = Keyframe.ofFloat(.5f, ballX + 100f);
124                 Keyframe kf2 = Keyframe.ofFloat(1f, ballX + 50f);
125                 PropertyValuesHolder pvhX = PropertyValuesHolder.ofKeyframe("x", kf0, kf1, kf2);
126                 ObjectAnimator yxBouncer = ObjectAnimator.ofPropertyValuesHolder(ball, pvhY,
127                         pvhX).setDuration(DURATION/2);
128                 yxBouncer.setRepeatCount(1);
129                 yxBouncer.setRepeatMode(ValueAnimator.REVERSE);
130 
131 
132                 bounceAnim = new AnimatorSet();
133                 ((AnimatorSet)bounceAnim).playTogether(yBouncer, yAlphaBouncer, whxyBouncer,
134                         yxBouncer);
135             }
136         }
137 
startAnimation()138         public void startAnimation() {
139             createAnimation();
140             bounceAnim.start();
141         }
142 
addBall(float x, float y)143         private ShapeHolder addBall(float x, float y) {
144             OvalShape circle = new OvalShape();
145             circle.resize(BALL_SIZE, BALL_SIZE);
146             ShapeDrawable drawable = new ShapeDrawable(circle);
147             ShapeHolder shapeHolder = new ShapeHolder(drawable);
148             shapeHolder.setX(x);
149             shapeHolder.setY(y);
150             int red = (int)(100 + Math.random() * 155);
151             int green = (int)(100 + Math.random() * 155);
152             int blue = (int)(100 + Math.random() * 155);
153             int color = 0xff000000 | red << 16 | green << 8 | blue;
154             Paint paint = drawable.getPaint();
155             int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
156             RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
157                     50f, color, darkColor, Shader.TileMode.CLAMP);
158             paint.setShader(gradient);
159             shapeHolder.setPaint(paint);
160             balls.add(shapeHolder);
161             return shapeHolder;
162         }
163 
164         @Override
onDraw(Canvas canvas)165         protected void onDraw(Canvas canvas) {
166             for (ShapeHolder ball : balls) {
167                 canvas.translate(ball.getX(), ball.getY());
168                 ball.getShape().draw(canvas);
169                 canvas.translate(-ball.getX(), -ball.getY());
170             }
171         }
172 
onAnimationUpdate(ValueAnimator animation)173         public void onAnimationUpdate(ValueAnimator animation) {
174             invalidate();
175         }
176 
177     }
178 }