add demo of bouncing balls to show various Animator APIs
Change-Id: I9d3aec9661d8845f67ea1c01b00f85f2380fd77f
This commit is contained in:
Chet Haase
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/*
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* Copyright (C) 2010 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.example.android.apis.animation;
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// Need the following import to get access to the app resources, since this
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// class is in a sub-package.
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import com.example.android.apis.R;
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import android.animation.*;
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import android.app.Activity;
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import android.content.Context;
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import android.graphics.Canvas;
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import android.graphics.Paint;
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import android.graphics.RadialGradient;
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import android.graphics.Shader;
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import android.graphics.drawable.ShapeDrawable;
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import android.graphics.drawable.shapes.OvalShape;
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import android.graphics.drawable.shapes.RectShape;
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import android.os.Bundle;
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import android.view.MotionEvent;
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import android.view.View;
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import android.view.animation.AccelerateInterpolator;
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import android.view.animation.DecelerateInterpolator;
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import android.widget.LinearLayout;
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import java.util.ArrayList;
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public class BouncingBalls extends Activity {
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/** Called when the activity is first created. */
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@Override
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public void onCreate(Bundle savedInstanceState) {
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super.onCreate(savedInstanceState);
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setContentView(R.layout.bouncing_balls);
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LinearLayout container = (LinearLayout) findViewById(R.id.container);
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container.addView(new MyAnimationView(this));
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}
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public class MyAnimationView extends View implements Animator.AnimatorUpdateListener, Animatable.AnimatableListener {
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private static final int RED = 0xffFF8080;
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private static final int BLUE = 0xff8080FF;
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private static final int CYAN = 0xff80ffff;
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private static final int GREEN = 0xff80ff80;
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public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>();
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Sequencer animation = null;
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public MyAnimationView(Context context) {
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super(context);
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// Create a colored background
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ShapeDrawable background = new ShapeDrawable(new RectShape());
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setBackgroundDrawable(background);
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Paint paint = background.getPaint();
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paint.setColor(RED);
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// Animate background color
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Animator colorAnim = new PropertyAnimator(3000, paint, "color", BLUE);
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colorAnim.setEvaluator(new RGBEvaluator());
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colorAnim.setRepeatCount(Animator.INFINITE);
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colorAnim.setRepeatMode(Animator.REVERSE);
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colorAnim.addUpdateListener(this); // forces invalidation to get the redraw
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colorAnim.start();
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}
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@Override
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public boolean onTouchEvent(MotionEvent event) {
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if (event.getAction() != MotionEvent.ACTION_DOWN &&
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event.getAction() != MotionEvent.ACTION_MOVE) {
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return false;
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}
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ShapeHolder newBall = addBall(event.getX(), event.getY());
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// Bouncing animation with squash and stretch
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float startY = newBall.getY();
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float endY = getHeight() - 50f;
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float h = (float)getHeight();
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float eventY = event.getY();
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int duration = (int)(500 * ((h - eventY)/h));
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Animator bounceAnim = new PropertyAnimator(duration, newBall, "y", startY, endY);
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bounceAnim.setInterpolator(new AccelerateInterpolator());
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Animator squashAnim1 = new PropertyAnimator(duration/4, newBall, "x", newBall.getX(),
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newBall.getX() - 25f);
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squashAnim1.setRepeatCount(1);
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squashAnim1.setRepeatMode(Animator.REVERSE);
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squashAnim1.setInterpolator(new DecelerateInterpolator());
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Animator squashAnim2 = new PropertyAnimator(duration/4, newBall, "width", newBall.getWidth(),
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newBall.getWidth() + 50);
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squashAnim2.setRepeatCount(1);
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squashAnim2.setRepeatMode(Animator.REVERSE);
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squashAnim2.setInterpolator(new DecelerateInterpolator());
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Animator stretchAnim1 = new PropertyAnimator(duration/4, newBall, "y", endY,
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endY + 25f);
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stretchAnim1.setRepeatCount(1);
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stretchAnim1.setInterpolator(new DecelerateInterpolator());
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stretchAnim1.setRepeatMode(Animator.REVERSE);
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Animator stretchAnim2 = new PropertyAnimator(duration/4, newBall, "height",
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newBall.getHeight(), newBall.getHeight() - 25);
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stretchAnim2.setRepeatCount(1);
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stretchAnim2.setInterpolator(new DecelerateInterpolator());
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stretchAnim2.setRepeatMode(Animator.REVERSE);
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Animator bounceBackAnim = new PropertyAnimator(duration, newBall, "y", endY,
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startY);
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bounceBackAnim.setInterpolator(new DecelerateInterpolator());
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// Sequence the down/squash&stretch/up animations
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Sequencer bouncer = new Sequencer();
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bouncer.play(bounceAnim).before(squashAnim1);
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bouncer.play(squashAnim1).with(squashAnim2);
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bouncer.play(squashAnim1).with(stretchAnim1);
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bouncer.play(squashAnim1).with(stretchAnim2);
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bouncer.play(bounceBackAnim).after(stretchAnim2);
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// Fading animation - remove the ball when the animation is done
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Animator fadeAnim = new PropertyAnimator(250, newBall, "alpha", 1f, 0f);
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fadeAnim.addListener(this);
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// Sequence the two animations to play one after the other
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Sequencer sequencer = new Sequencer();
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sequencer.play(bouncer).before(fadeAnim);
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// Start the animation
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sequencer.start();
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return true;
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}
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private ShapeHolder addBall(float x, float y) {
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OvalShape circle = new OvalShape();
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circle.resize(50f, 50f);
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ShapeDrawable drawable = new ShapeDrawable(circle);
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ShapeHolder shapeHolder = new ShapeHolder(drawable);
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shapeHolder.setX(x - 25f);
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shapeHolder.setY(y - 25f);
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int red = (int)(Math.random() * 255);
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int green = (int)(Math.random() * 255);
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int blue = (int)(Math.random() * 255);
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int color = 0xff000000 | red << 16 | green << 8 | blue;
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Paint paint = drawable.getPaint(); //new Paint(Paint.ANTI_ALIAS_FLAG);
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int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4;
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RadialGradient gradient = new RadialGradient(37.5f, 12.5f,
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50f, color, darkColor, Shader.TileMode.CLAMP);
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paint.setShader(gradient);
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shapeHolder.setPaint(paint);
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balls.add(shapeHolder);
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return shapeHolder;
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}
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@Override
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protected void onDraw(Canvas canvas) {
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for (int i = 0; i < balls.size(); ++i) {
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ShapeHolder shapeHolder = balls.get(i);
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canvas.save();
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canvas.translate(shapeHolder.getX(), shapeHolder.getY());
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shapeHolder.getShape().draw(canvas);
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canvas.restore();
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}
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}
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public void onAnimationUpdate(Animator animation) {
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invalidate();
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}
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@Override
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public void onAnimationCancel(Animatable animation) {
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}
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@Override
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public void onAnimationEnd(Animatable animation) {
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balls.remove(((PropertyAnimator)animation).getTarget());
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}
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@Override
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public void onAnimationRepeat(Animatable animation) {
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}
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@Override
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public void onAnimationStart(Animatable animation) {
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}
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}
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}
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