弹性动画


弹性动画

原创 2017年10月08日 09:10:03

首先我们要在build.gradle中引入如下依赖:
compile 'com.facebook.rebound:rebound:0.3.8'
//首先建一个图片布局

 
[html] view plain copy
  1. <ImageView  
  2.     android:id="@+id/iv"  
  3.     android:layout_width="wrap_content"  
  4.     android:layout_height="wrap_content"  
  5.     android:layout_centerInParent="true"  
  6.     android:src="@mipmap/ic_launcher" />  
[html] view plain copy
  1. //接着在onCreate()方法里写如下代码:  
  2. //找控件  
  3.   
  4. iv = (ImageView) findViewById(R.id.iv);  
  5. //设置点击事件  
  6. iv.setOnClickListener(new View.OnClickListener() {  
  7.     @Override  
  8.     public void onClick(View view) {  
  9.         onScale();//点击时调用此方法  
  10.     }  
  11. });  
  12.   
  13. private void onScale(){  
  14.     SpringSystem springSystem=SpringSystem.create();  
  15.     Spring spring=springSystem.createSpring();  
  16.     spring.setCurrentValue(1.0f);//初始值  
  17.     spring.setSpringConfig(new SpringConfig(60,4));  
  18.   
  19.     //效果可以改变这两个参数来改变效果  
  20.     //第一个表示拉力,越大效果越明显,第二个表示摩擦力,越小效果越明显  
  21.   
  22.     spring.addListener(new SimpleSpringListener(){          
  23.           @Override          
  24.           public void onSpringUpdate(Spring spring) {              
  25.                super.onSpringUpdate(spring);              
  26.                float currentValue= (float) spring.getCurrentValue();              
  27.                iv.setScaleX(currentValue);              
  28.                iv.setScaleY(currentValue);          
  29.          }      
  30.     });      
  31.     spring.setEndValue(1.8f);//结束值  

import java.applet.Applet; import java.awt.Color; import java.awt.Graphics; import java.awt.Rectangle; /** An applet that displays a simple animation */ public class BouncingCircle extends Applet implements Runnable { int x = 150, y = 50, r = 50; // Position and radius of the circle int dx = 11, dy = 7; // Trajectory of circle Thread animator; // The thread that performs the animation volatile boolean pleaseStop; // A flag to ask the thread to stop /** This method simply draws the circle at its current position */ public void paint(Graphics g) { g.setColor(Color.red); g.fillOval(x - r, y - r, r * 2, r * 2); } /** * This method moves (and bounces) the circle and then requests a redraw. * The animator thread calls this method periodically. */ public void animate() { // Bounce if we've hit an edge. Rectangle bounds = getBounds(); if ((x - r + dx < 0) || (x + r + dx > bounds.width)) dx = -dx; if ((y - r + dy < 0) || (y + r + dy > bounds.height)) dy = -dy; // Move the circle. x += dx; y += dy; // Ask the browser to call our paint() method to draw the circle // at its new position. repaint(); } /** * This method is from the Runnable interface. It is the body of the thread * that performs the animation. The thread itself is created and started in * the start() method. */ public void run() { while (!pleaseStop) { // Loop until we're asked to stop animate(); // Update and request redraw try { Thread.sleep(100); } // Wait 100 milliseconds catch (InterruptedException e) { } // Ignore interruptions } } /** Start animating when the browser starts the applet */ public void start() { animator = new Thread(this); // Create a thread pleaseStop = false; // Don't ask it to stop now animator.start(); // Start the thread. // The thread that called start now returns to its caller. // Meanwhile, the new animator thread has called the run() method } /** Stop animating when the browser stops the applet */ public void stop() { // Set the flag that causes the run() method to end pleaseStop = true; } }
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