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.Animator;
22 import com.example.android.apis.R;
23 
24 import java.util.ArrayList;
25 
26 import android.animation.ValueAnimator;
27 import android.animation.ObjectAnimator;
28 import android.animation.AnimatorSet;
29 import android.app.Activity;
30 import android.content.Context;
31 import android.graphics.Canvas;
32 import android.graphics.Paint;
33 import android.graphics.RadialGradient;
34 import android.graphics.Shader;
35 import android.graphics.drawable.ShapeDrawable;
36 import android.graphics.drawable.shapes.OvalShape;
37 import android.os.Bundle;
38 import android.view.View;
39 import android.view.animation.BounceInterpolator;
40 import android.widget.Button;
41 import android.widget.LinearLayout;
42 import android.widget.SeekBar;
43 
44 /**
45  * This application demonstrates the seeking capability of ValueAnimator. The SeekBar in the
46  * UI allows you to set the position of the animation. Pressing the Run button will play from
47  * the current position of the animation.
48  */
49 public class AnimationSeeking extends Activity {
50 
51     private static final int DURATION = 1500;
52     private SeekBar mSeekBar;
53 
54     /** Called when the activity is first created. */
55     @Override
onCreate(Bundle savedInstanceState)56     public void onCreate(Bundle savedInstanceState) {
57         super.onCreate(savedInstanceState);
58         setContentView(R.layout.animation_seeking);
59         LinearLayout container = (LinearLayout) findViewById(R.id.container);
60         final MyAnimationView animView = new MyAnimationView(this);
61         container.addView(animView);
62 
63         Button starter = (Button) findViewById(R.id.startButton);
64         starter.setOnClickListener(new View.OnClickListener() {
65             public void onClick(View v) {
66                 animView.startAnimation();
67             }
68         });
69 
70         mSeekBar = (SeekBar) findViewById(R.id.seekBar);
71         mSeekBar.setMax(DURATION);
72         mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
73             public void onStopTrackingTouch(SeekBar seekBar) {
74             }
75 
76             public void onStartTrackingTouch(SeekBar seekBar) {
77             }
78 
79             public void onProgressChanged(SeekBar seekBar, int progress,
80                     boolean fromUser) {
81                 // prevent seeking on app creation
82                 if (animView.getHeight() != 0) {
83                     animView.seek(progress);
84                 }
85             }
86         });
87     }
88 
89     public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener, Animator.AnimatorListener {
90 
91         private static final int RED = 0xffFF8080;
92         private static final int BLUE = 0xff8080FF;
93         private static final int CYAN = 0xff80ffff;
94         private static final int GREEN = 0xff80ff80;
95         private static final float BALL_SIZE = 100f;
96 
97         public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
98         AnimatorSet animation = null;
99         ValueAnimator bounceAnim = null;
100         ShapeHolder ball = null;
101 
MyAnimationView(Context context)102         public MyAnimationView(Context context) {
103             super(context);
104             ball = addBall(200, 0);
105         }
106 
createAnimation()107         private void createAnimation() {
108             if (bounceAnim == null) {
109                 bounceAnim = ObjectAnimator.ofFloat(ball, "y",
110                         ball.getY(), getHeight() - BALL_SIZE).setDuration(1500);
111                 bounceAnim.setInterpolator(new BounceInterpolator());
112                 bounceAnim.addUpdateListener(this);
113             }
114         }
115 
startAnimation()116         public void startAnimation() {
117             createAnimation();
118             bounceAnim.start();
119         }
120 
seek(long seekTime)121         public void seek(long seekTime) {
122             createAnimation();
123             bounceAnim.setCurrentPlayTime(seekTime);
124         }
125 
addBall(float x, float y)126         private ShapeHolder addBall(float x, float y) {
127             OvalShape circle = new OvalShape();
128             circle.resize(BALL_SIZE, BALL_SIZE);
129             ShapeDrawable drawable = new ShapeDrawable(circle);
130             ShapeHolder shapeHolder = new ShapeHolder(drawable);
131             shapeHolder.setX(x);
132             shapeHolder.setY(y);
133             int red = (int)(100 + Math.random() * 155);
134             int green = (int)(100 + Math.random() * 155);
135             int blue = (int)(100 + Math.random() * 155);
136             int color = 0xff000000 | red << 16 | green << 8 | blue;
137             Paint paint = drawable.getPaint();
138             int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
139             RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
140                     50f, color, darkColor, Shader.TileMode.CLAMP);
141             paint.setShader(gradient);
142             shapeHolder.setPaint(paint);
143             balls.add(shapeHolder);
144             return shapeHolder;
145         }
146 
147         @Override
onDraw(Canvas canvas)148         protected void onDraw(Canvas canvas) {
149             canvas.translate(ball.getX(), ball.getY());
150             ball.getShape().draw(canvas);
151         }
152 
onAnimationUpdate(ValueAnimator animation)153         public void onAnimationUpdate(ValueAnimator animation) {
154             invalidate();
155             long playtime = bounceAnim.getCurrentPlayTime();
156             //mSeekBar.setProgress((int)playtime);
157         }
158 
onAnimationCancel(Animator animation)159         public void onAnimationCancel(Animator animation) {
160         }
161 
onAnimationEnd(Animator animation)162         public void onAnimationEnd(Animator animation) {
163             balls.remove(((ObjectAnimator)animation).getTarget());
164 
165         }
166 
onAnimationRepeat(Animator animation)167         public void onAnimationRepeat(Animator animation) {
168         }
169 
onAnimationStart(Animator animation)170         public void onAnimationStart(Animator animation) {
171         }
172     }
173 }