Android Tween Animation

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div id=”content” contentScore=”3284″>Android支持动画效果。常见的有Tween Animation和Frame Animation.其中Frame Animation我们在墙面介绍过了，它比较简单。这里来介绍下Tween

Tween Animation 常见可以分成四种：

ScaleAnimation            ：渐变尺寸伸缩效果

AlphaAnimation            ：渐变透明度动画效果

TranslateAnimation      ：画面转换位置动画效果

RotateAnimation          ：画面转移动画效果

其中，我们可以在代码中直接使用，也可以把Animation做成资源XML文件，从资源中装载。

Animation Java Code的使用示例：

package com.rocky.demo;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.drawable.BitmapDrawable;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;
import android.view.animation.RotateAnimation;
import android.view.animation.ScaleAnimation;
import android.view.animation.TranslateAnimation;
public class GameView extends View {
 private Animation mAnimationAlpha=null;
 private Animation mAnimationScale=null;
 private Animation mAnimationTranslate=null;
 private Animation mAnimationRotate=null; 
 private Context mContext=null;
 Bitmap mBackGroundBitmap=null;
  int index=0;
 public GameView(Context context) {
  super(context);
  // TODO Auto-generated constructor stub
  mContext=context;
  mBackGroundBitmap=((BitmapDrawable)this.getResources().getDrawable(R.drawable.image2)).getBitmap();
 }
 @Override
 protected void onDraw(Canvas canvas) {
  // TODO Auto-generated method stub
  super.onDraw(canvas);
  canvas.drawBitmap(mBackGroundBitmap, 0,0,null);
 }
 @Override
 public boolean onKeyDown(int keyCode, KeyEvent event) {
  // TODO Auto-generated method stub
  
  switch(keyCode)
  {
  case KeyEvent.KEYCODE_DPAD_DOWN:
  {
   //mAnimationAlpha=AnimationUtils.loadAnimation(mContext, R.anim.alpha_animation);
   mAnimationAlpha=new AlphaAnimation(0.1f,1.0f);
   mAnimationAlpha.setDuration(10000);
   this.startAnimation(mAnimationAlpha);
  }
  break;
  case KeyEvent.KEYCODE_DPAD_UP:
  { 
   //mAnimationRotate=AnimationUtils.loadAnimation(mContext, R.anim.rotate_animation);
   mAnimationRotate=new RotateAnimation(0.0f,+360.0f,Animation.ABSOLUTE,400,Animation.ABSOLUTE,300);
   mAnimationRotate.setDuration(1000);
   
   this.startAnimation(mAnimationRotate);
  }
  break;
  case KeyEvent.KEYCODE_DPAD_LEFT:
  {
   //mAnimationScale=AnimationUtils.loadAnimation(mContext, R.anim.scale_animation);
   mAnimationScale=new ScaleAnimation(0.1f,3.0f,0.1f,3.0f,Animation.RELATIVE_TO_SELF,0.0f,Animation.RELATIVE_TO_SELF,0.5f);
   mAnimationScale.setDuration(4000);
   this.startAnimation(mAnimationScale);
  }
  break;
  case KeyEvent.KEYCODE_DPAD_RIGHT:
  {
   //mAnimationTranslate=AnimationUtils.loadAnimation(mContext, R.anim.translate_animation);
   mAnimationTranslate=new TranslateAnimation(0,800,0,600);
   mAnimationTranslate.setDuration(4000);
  ¼/div>