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 android.animation.Animator;
22import com.example.android.apis.R;
23
24import java.util.ArrayList;
25
26import android.animation.ValueAnimator;
27import android.animation.ObjectAnimator;
28import android.animation.AnimatorSet;
29import android.app.Activity;
30import android.content.Context;
31import android.graphics.Canvas;
32import android.graphics.Paint;
33import android.graphics.RadialGradient;
34import android.graphics.Shader;
35import android.graphics.drawable.ShapeDrawable;
36import android.graphics.drawable.shapes.OvalShape;
37import android.os.Bundle;
38import android.view.View;
39import android.view.animation.BounceInterpolator;
40import android.widget.Button;
41import android.widget.LinearLayout;
42import 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 */
49public 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
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
102        public MyAnimationView(Context context) {
103            super(context);
104            ball = addBall(200, 0);
105        }
106
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
116        public void startAnimation() {
117            createAnimation();
118            bounceAnim.start();
119        }
120
121        public void seek(long seekTime) {
122            createAnimation();
123            bounceAnim.setCurrentPlayTime(seekTime);
124        }
125
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
148        protected void onDraw(Canvas canvas) {
149            canvas.translate(ball.getX(), ball.getY());
150            ball.getShape().draw(canvas);
151        }
152
153        public void onAnimationUpdate(ValueAnimator animation) {
154            invalidate();
155            long playtime = bounceAnim.getCurrentPlayTime();
156            //mSeekBar.setProgress((int)playtime);
157        }
158
159        public void onAnimationCancel(Animator animation) {
160        }
161
162        public void onAnimationEnd(Animator animation) {
163            balls.remove(((ObjectAnimator)animation).getTarget());
164
165        }
166
167        public void onAnimationRepeat(Animator animation) {
168        }
169
170        public void onAnimationStart(Animator animation) {
171        }
172    }
173}