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.widget.Button;
22import com.example.android.apis.R;
23
24import android.animation.*;
25import android.app.Activity;
26import android.content.Context;
27import android.graphics.Canvas;
28import android.graphics.Paint;
29import android.graphics.RadialGradient;
30import android.graphics.Shader;
31import android.graphics.drawable.ShapeDrawable;
32import android.graphics.drawable.shapes.OvalShape;
33import android.os.Bundle;
34import android.view.View;
35import android.view.animation.AccelerateInterpolator;
36import android.view.animation.DecelerateInterpolator;
37import android.widget.LinearLayout;
38
39import java.util.ArrayList;
40
41
42public class AnimationCloning extends Activity {
43    /** Called when the activity is first created. */
44    @Override
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
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
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
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
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
138        public void startAnimation() {
139            createAnimation();
140            animation.start();
141        }
142
143        public void onAnimationUpdate(ValueAnimator animation) {
144            invalidate();
145        }
146
147    }
148}