Android:Animation的简单学习

public class HelloAnimationActivity extends Activity {       /** Called when the activity is first created. */       Button b_alpha;       Button b_scale;       Button b_rotate;       Button b_translate;       ImageView iv;       AnimationSet animationSet;       @Override       public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           setContentView(R.layout.main);                     iv = (ImageView)findViewById(R.id.image);           b_alpha = (Button)findViewById(R.id.alpha);           b_scale = (Button)findViewById(R.id.scale);           b_rotate = (Button)findViewById(R.id.rotate);           b_translate = (Button)findViewById(R.id.translate);                      b_alpha.setOnClickListener(new AlpahListener());           b_scale.setOnClickListener(new ScaleListener());           b_rotate.setOnClickListener(new RotateListener());           b_translate.setOnClickListener(new TranslateListener());                  }              class AlpahListener implements OnClickListener{                      @Override           public void onClick(View v) {               //创建一个AnimationSet对象                AnimationSet animationSet = new AnimationSet(true);               //创建一个AlphaAnimation对象                AlphaAnimation alphaAnimation = new AlphaAnimation(1, 0);               //设置动画执行的时间（单位：毫秒）                alphaAnimation.setDuration(1000);               //将AlphaAnimation对象添加到AnimationSet当中                animationSet.addAnimation(alphaAnimation);               //使用ImageView的startAnimation方法开始执行动画                iv.startAnimation(animationSet);           }                  }              class ScaleListener implements OnClickListener{           /**           * 从大到小的动画，x轴1到0.1，y轴1到0.1。中心为图片的中心(0.5f,0.5f)           */           @Override           public void onClick(View arg0) {               AnimationSet animationSet = new AnimationSet(true);               ScaleAnimation scaleAnimation = new ScaleAnimation(1, 0.1f, 1, 0.1f,                       Animation.RELATIVE_TO_SELF, 0.5f,                       Animation.RELATIVE_TO_SELF, 0.5f);               animationSet.addAnimation(scaleAnimation);               animationSet.setStartOffset(1000);               animationSet.setFillAfter(true);               animationSet.setFillBefore(false);               animationSet.setDuration(2000);               iv.startAnimation(animationSet);                          }                  }              class RotateListener implements OnClickListener{           /**           * 以图片中心旋转360度；（0.5f,0.5f）表示图片的中心           */           @Override           public void onClick(View arg0) {               // TODO Auto-generated method stub                animationSet = new AnimationSet(true);               RotateAnimation rotateAnimation = new RotateAnimation(0, 360,                       Animation.RELATIVE_TO_SELF, 0.5f,                       Animation.RELATIVE_TO_SELF, 0.5f);               rotateAnimation.setDuration(5000);               animationSet.addAnimation(rotateAnimation);               iv.setAnimation(rotateAnimation);           }                  }              class TranslateListener implements OnClickListener{              @Override           public void onClick(View arg0) {               // TODO Auto-generated method stub                animationSet = new AnimationSet(true);               TranslateAnimation translateAnimation = new TranslateAnimation(                       Animation.RELATIVE_TO_SELF, 0f,                       Animation.RELATIVE_TO_SELF, 0.5f,                       Animation.RELATIVE_TO_SELF, 0f,                       Animation.RELATIVE_TO_SELF, 1.0f);               animationSet.addAnimation(translateAnimation);               iv.setAnimation(animationSet);           }                  }   }