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      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.*;
     22 import android.view.animation.AccelerateInterpolator;
     23 import com.example.android.apis.R;
     24 
     25 import java.util.ArrayList;
     26 
     27 import android.app.Activity;
     28 import android.content.Context;
     29 import android.graphics.Canvas;
     30 import android.graphics.Paint;
     31 import android.graphics.RadialGradient;
     32 import android.graphics.Shader;
     33 import android.graphics.drawable.ShapeDrawable;
     34 import android.graphics.drawable.shapes.OvalShape;
     35 import android.os.Bundle;
     36 import android.view.View;
     37 import android.view.animation.BounceInterpolator;
     38 import android.widget.Button;
     39 import android.widget.LinearLayout;
     40 
     41 /**
     42  * This application demonstrates the seeking capability of ValueAnimator. The SeekBar in the
     43  * UI allows you to set the position of the animation. Pressing the Run button will play from
     44  * the current position of the animation.
     45  */
     46 public class MultiPropertyAnimation extends Activity {
     47 
     48     private static final int DURATION = 1500;
     49 
     50     @Override
     51     public void onCreate(Bundle savedInstanceState) {
     52         super.onCreate(savedInstanceState);
     53         setContentView(R.layout.animation_multi_property);
     54         LinearLayout container = (LinearLayout) findViewById(R.id.container);
     55         final MyAnimationView animView = new MyAnimationView(this);
     56         container.addView(animView);
     57 
     58         Button starter = (Button) findViewById(R.id.startButton);
     59         starter.setOnClickListener(new View.OnClickListener() {
     60 
     61             public void onClick(View v) {
     62                 animView.startAnimation();
     63             }
     64         });
     65 
     66     }
     67 
     68     public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener {
     69 
     70         private static final float BALL_SIZE = 100f;
     71 
     72         public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
     73         AnimatorSet animation = null;
     74         Animator bounceAnim = null;
     75         ShapeHolder ball = null;
     76 
     77         public MyAnimationView(Context context) {
     78             super(context);
     79             addBall(50, 0);
     80             addBall(150, 0);
     81             addBall(250, 0);
     82             addBall(350, 0);
     83         }
     84 
     85         private void createAnimation() {
     86             if (bounceAnim == null) {
     87                 ShapeHolder ball;
     88                 ball = balls.get(0);
     89                 ObjectAnimator yBouncer = ObjectAnimator.ofFloat(ball, "y",
     90                         ball.getY(), getHeight() - BALL_SIZE).setDuration(DURATION);
     91                 yBouncer.setInterpolator(new BounceInterpolator());
     92                 yBouncer.addUpdateListener(this);
     93 
     94                 ball = balls.get(1);
     95                 PropertyValuesHolder pvhY = PropertyValuesHolder.ofFloat("y", ball.getY(),
     96                         getHeight() - BALL_SIZE);
     97                 PropertyValuesHolder pvhAlpha = PropertyValuesHolder.ofFloat("alpha", 1.0f, 0f);
     98                 ObjectAnimator yAlphaBouncer = ObjectAnimator.ofPropertyValuesHolder(ball,
     99                         pvhY, pvhAlpha).setDuration(DURATION/2);
    100                 yAlphaBouncer.setInterpolator(new AccelerateInterpolator());
    101                 yAlphaBouncer.setRepeatCount(1);
    102                 yAlphaBouncer.setRepeatMode(ValueAnimator.REVERSE);
    103 
    104 
    105                 ball = balls.get(2);
    106                 PropertyValuesHolder pvhW = PropertyValuesHolder.ofFloat("width", ball.getWidth(),
    107                         ball.getWidth() * 2);
    108                 PropertyValuesHolder pvhH = PropertyValuesHolder.ofFloat("height", ball.getHeight(),
    109                         ball.getHeight() * 2);
    110                 PropertyValuesHolder pvTX = PropertyValuesHolder.ofFloat("x", ball.getX(),
    111                         ball.getX() - BALL_SIZE/2f);
    112                 PropertyValuesHolder pvTY = PropertyValuesHolder.ofFloat("y", ball.getY(),
    113                         ball.getY() - BALL_SIZE/2f);
    114                 ObjectAnimator whxyBouncer = ObjectAnimator.ofPropertyValuesHolder(ball, pvhW, pvhH,
    115                         pvTX, pvTY).setDuration(DURATION/2);
    116                 whxyBouncer.setRepeatCount(1);
    117                 whxyBouncer.setRepeatMode(ValueAnimator.REVERSE);
    118 
    119                 ball = balls.get(3);
    120                 pvhY = PropertyValuesHolder.ofFloat("y", ball.getY(), getHeight() - BALL_SIZE);
    121                 float ballX = ball.getX();
    122                 Keyframe kf0 = Keyframe.ofFloat(0f, ballX);
    123                 Keyframe kf1 = Keyframe.ofFloat(.5f, ballX + 100f);
    124                 Keyframe kf2 = Keyframe.ofFloat(1f, ballX + 50f);
    125                 PropertyValuesHolder pvhX = PropertyValuesHolder.ofKeyframe("x", kf0, kf1, kf2);
    126                 ObjectAnimator yxBouncer = ObjectAnimator.ofPropertyValuesHolder(ball, pvhY,
    127                         pvhX).setDuration(DURATION/2);
    128                 yxBouncer.setRepeatCount(1);
    129                 yxBouncer.setRepeatMode(ValueAnimator.REVERSE);
    130 
    131 
    132                 bounceAnim = new AnimatorSet();
    133                 ((AnimatorSet)bounceAnim).playTogether(yBouncer, yAlphaBouncer, whxyBouncer,
    134                         yxBouncer);
    135             }
    136         }
    137 
    138         public void startAnimation() {
    139             createAnimation();
    140             bounceAnim.start();
    141         }
    142 
    143         private ShapeHolder addBall(float x, float y) {
    144             OvalShape circle = new OvalShape();
    145             circle.resize(BALL_SIZE, BALL_SIZE);
    146             ShapeDrawable drawable = new ShapeDrawable(circle);
    147             ShapeHolder shapeHolder = new ShapeHolder(drawable);
    148             shapeHolder.setX(x);
    149             shapeHolder.setY(y);
    150             int red = (int)(100 + Math.random() * 155);
    151             int green = (int)(100 + Math.random() * 155);
    152             int blue = (int)(100 + Math.random() * 155);
    153             int color = 0xff000000 | red << 16 | green << 8 | blue;
    154             Paint paint = drawable.getPaint();
    155             int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
    156             RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
    157                     50f, color, darkColor, Shader.TileMode.CLAMP);
    158             paint.setShader(gradient);
    159             shapeHolder.setPaint(paint);
    160             balls.add(shapeHolder);
    161             return shapeHolder;
    162         }
    163 
    164         @Override
    165         protected void onDraw(Canvas canvas) {
    166             for (ShapeHolder ball : balls) {
    167                 canvas.translate(ball.getX(), ball.getY());
    168                 ball.getShape().draw(canvas);
    169                 canvas.translate(-ball.getX(), -ball.getY());
    170             }
    171         }
    172 
    173         public void onAnimationUpdate(ValueAnimator animation) {
    174             invalidate();
    175         }
    176 
    177     }
    178 }