AnimationSeeking.java revision b9461fc8ef49e050b97d5305f32bc50099c78a16 
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
17package 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.
21import com.example.android.apis.R;
22
23import java.util.ArrayList;
24
25import android.animation.Animatable;
26import android.animation.Animator;
27import android.animation.PropertyAnimator;
28import android.animation.Sequencer;
29import android.animation.Animatable.AnimatableListener;
30import android.app.Activity;
31import android.content.Context;
32import android.graphics.Canvas;
33import android.graphics.Paint;
34import android.graphics.RadialGradient;
35import android.graphics.Shader;
36import android.graphics.drawable.ShapeDrawable;
37import android.graphics.drawable.shapes.OvalShape;
38import android.os.Bundle;
39import android.view.View;
40import android.view.animation.BounceInterpolator;
41import android.widget.Button;
42import android.widget.LinearLayout;
43import android.widget.SeekBar;
44
45/**
46 * This application demonstrates the seeking capability of Animator. The SeekBar in the
47 * UI allows you to set the position of the animation. Pressing the Run button will play from
48 * the current position of the animation.
49 */
50public class AnimationSeeking extends Activity {
51
52    private static final int DURATION = 1500;
53    private SeekBar mSeekBar;
54
55    /** Called when the activity is first created. */
56    @Override
57    public void onCreate(Bundle savedInstanceState) {
58        super.onCreate(savedInstanceState);
59        setContentView(R.layout.animation_seeking);
60        LinearLayout container = (LinearLayout) findViewById(R.id.container);
61        final MyAnimationView animView = new MyAnimationView(this);
62        container.addView(animView);
63
64        Button starter = (Button) findViewById(R.id.startButton);
65        starter.setOnClickListener(new View.OnClickListener() {
66
67            @Override
68            public void onClick(View v) {
69                animView.startAnimation();
70            }
71        });
72
73        mSeekBar = (SeekBar) findViewById(R.id.seekBar);
74        mSeekBar.setMax(DURATION);
75        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
76
77            @Override
78            public void onStopTrackingTouch(SeekBar seekBar) {
79            }
80
81            @Override
82            public void onStartTrackingTouch(SeekBar seekBar) {
83            }
84
85            @Override
86            public void onProgressChanged(SeekBar seekBar, int progress,
87                    boolean fromUser) {
88                // prevent seeking on app creation
89                if (animView.getHeight() != 0) {
90                    animView.seek(progress);
91                }
92            }
93        });
94    }
95
96    public class MyAnimationView extends View implements Animator.AnimatorUpdateListener, AnimatableListener {
97
98        private static final int RED = 0xffFF8080;
99        private static final int BLUE = 0xff8080FF;
100        private static final int CYAN = 0xff80ffff;
101        private static final int GREEN = 0xff80ff80;
102        private static final float BALL_SIZE = 100f;
103
104        public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
105        Sequencer animation = null;
106        Animator bounceAnim = null;
107        ShapeHolder ball = null;
108
109        public MyAnimationView(Context context) {
110            super(context);
111            ball = addBall(200, 0);
112        }
113
114        private void createAnimation() {
115            if (bounceAnim == null) {
116                bounceAnim = new PropertyAnimator(1500, ball, "y",
117                        ball.getY(), getHeight() - BALL_SIZE);
118                bounceAnim.setInterpolator(new BounceInterpolator());
119                bounceAnim.addUpdateListener(this);
120            }
121        }
122
123        public void startAnimation() {
124            createAnimation();
125            bounceAnim.start();
126        }
127
128        public void seek(long seekTime) {
129            createAnimation();
130            bounceAnim.setCurrentPlayTime(seekTime);
131        }
132
133        private ShapeHolder addBall(float x, float y) {
134            OvalShape circle = new OvalShape();
135            circle.resize(BALL_SIZE, BALL_SIZE);
136            ShapeDrawable drawable = new ShapeDrawable(circle);
137            ShapeHolder shapeHolder = new ShapeHolder(drawable);
138            shapeHolder.setX(x);
139            shapeHolder.setY(y);
140            int red = (int)(100 + Math.random() * 155);
141            int green = (int)(100 + Math.random() * 155);
142            int blue = (int)(100 + Math.random() * 155);
143            int color = 0xff000000 | red << 16 | green << 8 | blue;
144            Paint paint = drawable.getPaint();
145            int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
146            RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
147                    50f, color, darkColor, Shader.TileMode.CLAMP);
148            paint.setShader(gradient);
149            shapeHolder.setPaint(paint);
150            balls.add(shapeHolder);
151            return shapeHolder;
152        }
153
154        @Override
155        protected void onDraw(Canvas canvas) {
156            canvas.translate(ball.getX(), ball.getY());
157            ball.getShape().draw(canvas);
158        }
159
160        public void onAnimationUpdate(Animator animation) {
161            invalidate();
162            long playtime = bounceAnim.getCurrentPlayTime();
163            //mSeekBar.setProgress((int)playtime);
164        }
165
166        @Override
167        public void onAnimationCancel(Animatable animation) {
168        }
169
170        @Override
171        public void onAnimationEnd(Animatable animation) {
172            balls.remove(((PropertyAnimator)animation).getTarget());
173
174        }
175
176        @Override
177        public void onAnimationRepeat(Animatable animation) {
178        }
179
180        @Override
181        public void onAnimationStart(Animatable animation) {
182        }
183    }
184}