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.ObjectAnimator; 22 import android.animation.ValueAnimator; 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.AccelerateInterpolator; 38 import android.widget.Button; 39 import android.widget.LinearLayout; 40 41 public class ReversingAnimation extends Activity { 42 43 @Override onCreate(Bundle savedInstanceState)44 public void onCreate(Bundle savedInstanceState) { 45 super.onCreate(savedInstanceState); 46 setContentView(R.layout.animation_reversing); 47 LinearLayout container = (LinearLayout) findViewById(R.id.container); 48 final MyAnimationView animView = new MyAnimationView(this); 49 container.addView(animView); 50 51 Button starter = (Button) findViewById(R.id.startButton); 52 starter.setOnClickListener(new View.OnClickListener() { 53 public void onClick(View v) { 54 animView.startAnimation(); 55 } 56 }); 57 58 Button reverser = (Button) findViewById(R.id.reverseButton); 59 reverser.setOnClickListener(new View.OnClickListener() { 60 public void onClick(View v) { 61 animView.reverseAnimation(); 62 } 63 }); 64 65 } 66 67 public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener { 68 69 public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>(); 70 ValueAnimator bounceAnim = null; 71 ShapeHolder ball = null; 72 MyAnimationView(Context context)73 public MyAnimationView(Context context) { 74 super(context); 75 ball = createBall(25, 25); 76 } 77 createAnimation()78 private void createAnimation() { 79 if (bounceAnim == null) { 80 bounceAnim = ObjectAnimator.ofFloat(ball, "y", ball.getY(), getHeight() - 50f). 81 setDuration(1500); 82 bounceAnim.setInterpolator(new AccelerateInterpolator(2f)); 83 bounceAnim.addUpdateListener(this); 84 } 85 } 86 startAnimation()87 public void startAnimation() { 88 createAnimation(); 89 bounceAnim.start(); 90 } 91 reverseAnimation()92 public void reverseAnimation() { 93 createAnimation(); 94 bounceAnim.reverse(); 95 } 96 seek(long seekTime)97 public void seek(long seekTime) { 98 createAnimation(); 99 bounceAnim.setCurrentPlayTime(seekTime); 100 } 101 createBall(float x, float y)102 private ShapeHolder createBall(float x, float y) { 103 OvalShape circle = new OvalShape(); 104 circle.resize(50f, 50f); 105 ShapeDrawable drawable = new ShapeDrawable(circle); 106 ShapeHolder shapeHolder = new ShapeHolder(drawable); 107 shapeHolder.setX(x - 25f); 108 shapeHolder.setY(y - 25f); 109 int red = (int)(Math.random() * 255); 110 int green = (int)(Math.random() * 255); 111 int blue = (int)(Math.random() * 255); 112 int color = 0xff000000 | red << 16 | green << 8 | blue; 113 Paint paint = drawable.getPaint(); //new Paint(Paint.ANTI_ALIAS_FLAG); 114 int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4; 115 RadialGradient gradient = new RadialGradient(37.5f, 12.5f, 116 50f, color, darkColor, Shader.TileMode.CLAMP); 117 paint.setShader(gradient); 118 shapeHolder.setPaint(paint); 119 return shapeHolder; 120 } 121 122 @Override onDraw(Canvas canvas)123 protected void onDraw(Canvas canvas) { 124 canvas.save(); 125 canvas.translate(ball.getX(), ball.getY()); 126 ball.getShape().draw(canvas); 127 canvas.restore(); 128 } 129 onAnimationUpdate(ValueAnimator animation)130 public void onAnimationUpdate(ValueAnimator animation) { 131 invalidate(); 132 } 133 134 } 135 }