| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package com.example.android.apis.animation; |
| |
| // Need the following import to get access to the app resources, since this |
| // class is in a sub-package. |
| import android.animation.ObjectAnimator; |
| import android.animation.TypeEvaluator; |
| import android.animation.ValueAnimator; |
| import com.example.android.apis.R; |
| |
| import java.util.ArrayList; |
| |
| import android.app.Activity; |
| import android.content.Context; |
| import android.graphics.Canvas; |
| import android.graphics.Paint; |
| import android.graphics.RadialGradient; |
| import android.graphics.Shader; |
| import android.graphics.drawable.ShapeDrawable; |
| import android.graphics.drawable.shapes.OvalShape; |
| import android.os.Bundle; |
| import android.view.View; |
| import android.widget.Button; |
| import android.widget.LinearLayout; |
| |
| public class CustomEvaluator extends Activity { |
| |
| @Override |
| public void onCreate(Bundle savedInstanceState) { |
| super.onCreate(savedInstanceState); |
| setContentView(R.layout.animator_custom_evaluator); |
| LinearLayout container = (LinearLayout) findViewById(R.id.container); |
| final MyAnimationView animView = new MyAnimationView(this); |
| container.addView(animView); |
| |
| Button starter = (Button) findViewById(R.id.startButton); |
| starter.setOnClickListener(new View.OnClickListener() { |
| public void onClick(View v) { |
| animView.startAnimation(); |
| } |
| }); |
| } |
| |
| public class XYHolder { |
| private float mX; |
| private float mY; |
| |
| public XYHolder(float x, float y) { |
| mX = x; |
| mY = y; |
| } |
| |
| public float getX() { |
| return mX; |
| } |
| |
| public void setX(float x) { |
| mX = x; |
| } |
| |
| public float getY() { |
| return mY; |
| } |
| |
| public void setY(float y) { |
| mY = y; |
| } |
| } |
| |
| public class XYEvaluator implements TypeEvaluator { |
| public Object evaluate(float fraction, Object startValue, Object endValue) { |
| XYHolder startXY = (XYHolder) startValue; |
| XYHolder endXY = (XYHolder) endValue; |
| return new XYHolder(startXY.getX() + fraction * (endXY.getX() - startXY.getX()), |
| startXY.getY() + fraction * (endXY.getY() - startXY.getY())); |
| } |
| } |
| |
| public class BallXYHolder { |
| |
| private ShapeHolder mBall; |
| |
| public BallXYHolder(ShapeHolder ball) { |
| mBall = ball; |
| } |
| |
| public void setXY(XYHolder xyHolder) { |
| mBall.setX(xyHolder.getX()); |
| mBall.setY(xyHolder.getY()); |
| } |
| |
| public XYHolder getXY() { |
| return new XYHolder(mBall.getX(), mBall.getY()); |
| } |
| } |
| |
| public class MyAnimationView extends View implements ValueAnimator.AnimatorUpdateListener { |
| |
| public final ArrayList<ShapeHolder> balls = new ArrayList<ShapeHolder>(); |
| ValueAnimator bounceAnim = null; |
| ShapeHolder ball = null; |
| BallXYHolder ballHolder = null; |
| |
| public MyAnimationView(Context context) { |
| super(context); |
| ball = createBall(25, 25); |
| ballHolder = new BallXYHolder(ball); |
| } |
| |
| private void createAnimation() { |
| if (bounceAnim == null) { |
| XYHolder startXY = new XYHolder(0f, 0f); |
| XYHolder endXY = new XYHolder(300f, 500f); |
| bounceAnim = ObjectAnimator.ofObject(ballHolder, "xY", |
| new XYEvaluator(), endXY); |
| bounceAnim.setDuration(1500); |
| bounceAnim.addUpdateListener(this); |
| } |
| } |
| |
| public void startAnimation() { |
| createAnimation(); |
| bounceAnim.start(); |
| } |
| |
| private ShapeHolder createBall(float x, float y) { |
| OvalShape circle = new OvalShape(); |
| circle.resize(50f, 50f); |
| ShapeDrawable drawable = new ShapeDrawable(circle); |
| ShapeHolder shapeHolder = new ShapeHolder(drawable); |
| shapeHolder.setX(x - 25f); |
| shapeHolder.setY(y - 25f); |
| int red = (int)(Math.random() * 255); |
| int green = (int)(Math.random() * 255); |
| int blue = (int)(Math.random() * 255); |
| int color = 0xff000000 | red << 16 | green << 8 | blue; |
| Paint paint = drawable.getPaint(); //new Paint(Paint.ANTI_ALIAS_FLAG); |
| int darkColor = 0xff000000 | red/4 << 16 | green/4 << 8 | blue/4; |
| RadialGradient gradient = new RadialGradient(37.5f, 12.5f, |
| 50f, color, darkColor, Shader.TileMode.CLAMP); |
| paint.setShader(gradient); |
| shapeHolder.setPaint(paint); |
| return shapeHolder; |
| } |
| |
| @Override |
| protected void onDraw(Canvas canvas) { |
| canvas.save(); |
| canvas.translate(ball.getX(), ball.getY()); |
| ball.getShape().draw(canvas); |
| canvas.restore(); |
| } |
| |
| public void onAnimationUpdate(ValueAnimator animation) { |
| invalidate(); |
| } |
| |
| } |
| } |