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.widget.Button;
22 import com.example.android.apis.R;
23 
24 import android.animation.*;
25 import android.app.Activity;
26 import android.content.Context;
27 import android.graphics.Canvas;
28 import android.graphics.Paint;
29 import android.graphics.RadialGradient;
30 import android.graphics.Shader;
31 import android.graphics.drawable.ShapeDrawable;
32 import android.graphics.drawable.shapes.OvalShape;
33 import android.os.Bundle;
34 import android.view.View;
35 import android.view.animation.AccelerateInterpolator;
36 import android.view.animation.DecelerateInterpolator;
37 import android.widget.LinearLayout;
38 
39 import java.util.ArrayList;
40 
41 
42 public class AnimationCloning extends Activity {
43     /** Called when the activity is first created. */
44     @Override
onCreate(Bundle savedInstanceState)45     public void onCreate(Bundle savedInstanceState) {
46         super.onCreate(savedInstanceState);
47         setContentView(R.layout.animation_cloning);
48         LinearLayout container = (LinearLayout) findViewById(R.id.container);
49         final MyAnimationView animView = new MyAnimationView(this);
50         container.addView(animView);
51 
52         Button starter = (Button) findViewById(R.id.startButton);
53         starter.setOnClickListener(new View.OnClickListener() {
54 
55             public void onClick(View v) {
56                 animView.startAnimation();
57             }
58         });
59     }
60 
61     public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener {
62 
63         public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
64         AnimatorSet animation = null;
65         private float mDensity;
66 
MyAnimationView(Context context)67         public MyAnimationView(Context context) {
68             super(context);
69 
70             mDensity = getContext().getResources().getDisplayMetrics().density;
71 
72             ShapeHolder ball0 = addBall(50f, 25f);
73             ShapeHolder ball1 = addBall(150f, 25f);
74             ShapeHolder ball2 = addBall(250f, 25f);
75             ShapeHolder ball3 = addBall(350f, 25f);
76         }
77 
createAnimation()78         private void createAnimation() {
79             if (animation == null) {
80                 ObjectAnimator anim1 = ObjectAnimator.ofFloat(balls.get(0), "y",
81                         0f, getHeight() - balls.get(0).getHeight()).setDuration(500);
82                 ObjectAnimator anim2 = anim1.clone();
83                 anim2.setTarget(balls.get(1));
84                 anim1.addUpdateListener(this);
85 
86                 ShapeHolder ball2 = balls.get(2);
87                 ObjectAnimator animDown = ObjectAnimator.ofFloat(ball2, "y",
88                         0f, getHeight() - ball2.getHeight()).setDuration(500);
89                 animDown.setInterpolator(new AccelerateInterpolator());
90                 ObjectAnimator animUp = ObjectAnimator.ofFloat(ball2, "y",
91                         getHeight() - ball2.getHeight(), 0f).setDuration(500);
92                 animUp.setInterpolator(new DecelerateInterpolator());
93                 AnimatorSet s1 = new AnimatorSet();
94                 s1.playSequentially(animDown, animUp);
95                 animDown.addUpdateListener(this);
96                 animUp.addUpdateListener(this);
97                 AnimatorSet s2 = (AnimatorSet) s1.clone();
98                 s2.setTarget(balls.get(3));
99 
100                 animation = new AnimatorSet();
101                 animation.playTogether(anim1, anim2, s1);
102                 animation.playSequentially(s1, s2);
103             }
104         }
105 
addBall(float x, float y)106         private ShapeHolder addBall(float x, float y) {
107             OvalShape circle = new OvalShape();
108             circle.resize(50f * mDensity, 50f * mDensity);
109             ShapeDrawable drawable = new ShapeDrawable(circle);
110             ShapeHolder shapeHolder = new ShapeHolder(drawable);
111             shapeHolder.setX(x - 25f);
112             shapeHolder.setY(y - 25f);
113             int red = (int)(100 + Math.random() * 155);
114             int green = (int)(100 + Math.random() * 155);
115             int blue = (int)(100 + Math.random() * 155);
116             int color = 0xff000000 | red << 16 | green << 8 | blue;
117             Paint paint = drawable.getPaint(); //new Paint(Paint.ANTI_ALIAS_FLAG);
118             int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
119             RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
120                     50f, color, darkColor, Shader.TileMode.CLAMP);
121             paint.setShader(gradient);
122             shapeHolder.setPaint(paint);
123             balls.add(shapeHolder);
124             return shapeHolder;
125         }
126 
127         @Override
onDraw(Canvas canvas)128         protected void onDraw(Canvas canvas) {
129             for (int i = 0; i < balls.size(); ++i) {
130                 ShapeHolder shapeHolder = balls.get(i);
131                 canvas.save();
132                 canvas.translate(shapeHolder.getX(), shapeHolder.getY());
133                 shapeHolder.getShape().draw(canvas);
134                 canvas.restore();
135             }
136         }
137 
startAnimation()138         public void startAnimation() {
139             createAnimation();
140             animation.start();
141         }
142 
onAnimationUpdate(ValueAnimator animation)143         public void onAnimationUpdate(ValueAnimator animation) {
144             invalidate();
145         }
146 
147     }
148 }