从BouncingBall.java中学习使用属性动画记录 - JAVA

/*
 * 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.graphics.drawable.ColorDrawable;
import com.example.android.apis.R;

import android.animation.*;
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.MotionEvent;
import android.view.View;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;
import android.widget.LinearLayout;

import java.util.ArrayList;


public class BouncingBalls extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.bouncing_balls);
        LinearLayout container = (LinearLayout) findViewById(R.id.container);
        container.addView(new MyAnimationView(this));
    }

    public class MyAnimationView extends View {

        private static final int RED = 0xffFF8080;
        private static final int BLUE = 0xff8080FF;
        private static final int CYAN = 0xff80ffff;
        private static final int GREEN = 0xff80ff80;

        public final ArrayList
  





    balls = new ArrayList
   
    (); AnimatorSet animation = null; public MyAnimationView(Context context) { super(context); //start{ ValueAnimator colorAnim = ObjectAnimator.ofInt(this, "backgroundColor", RED, BLUE);//创建一个动画器；"backgroundColor"是属性的名称；[RED, BLUE]是属性取值区间 colorAnim.setDuration(3000);//设置动画持续时间 colorAnim.seteva luator(new Argbeva luator());//类型评估器，有了和前面指定的属性相对应的类型的评估器，动画器才能理解这个属性； colorAnim.setRepeatCount(ValueAnimator.INFINITE);//设置重复次数 colorAnim.setRepeatMode(ValueAnimator.REVERSE);//设置重复模式 colorAnim.start();//启动动画 //end} //这断代码是绘制属性动画的基本动作//还有一个setInterpolator()函数设置时间插值，默认没有设置的话是线性插值器
    

} @Override public boolean onTouchEvent(MotionEvent event) { if (event.getAction() != MotionEvent.ACTION_DOWN && event.getAction() != MotionEvent.ACTION_MOVE) { return false; } ShapeHolder newBall = addBall(event.getX(), event.getY()); // Bouncing animation
 with squash and stretch float startY = newBall.getY(); float endY = getHeight() - 50f; float h = (float)getHeight(); float eventY = event.getY(); int duration = (int)(500 * ((h - eventY)/h)); ValueAnimator bounceAnim = ObjectAnimator.ofFloat(newBall, "y",
 startY, endY); bounceAnim.setDuration(duration); bounceAnim.setInterpolator(new AccelerateInterpolator()); ValueAnimator squashAnim1 = Object
从BouncingBall.java中学习使用属性动画记录(一)
