Animaiton 的使用

public class MainActivity extends Activity implements OnClickListener      {          /**         * 定义四个按钮和一张图片         */          private ImageView imageView = null;          private Button rotateButton = null;          private Button scaleButton = null;          private Button alphaButton = null;          private Button translateButton = null;                @Override          public void onCreate(Bundle savedInstanceState)          {              super.onCreate(savedInstanceState);              setContentView(R.layout.main);              initView();          }                /**         * 初始化界面         */          public void initView()          {              imageView = (ImageView) findViewById(R.id.imageViewId);                    rotateButton = (Button) findViewById(R.id.rotateButtonId);              translateButton = (Button) findViewById(R.id.translateButtonId);              scaleButton = (Button) findViewById(R.id.scaleButtonId);              alphaButton = (Button) findViewById(R.id.alphaButtonId);                    rotateButton.setOnClickListener(this);              scaleButton.setOnClickListener(this);              alphaButton.setOnClickListener(this);              translateButton.setOnClickListener(this);          }                @Override          public void onClick(View v)          {              // TODO Auto-generated method stub              int switchID = v.getId();              switch (switchID)              {              case R.id.alphaButtonId:              {                                    AnimationSet animationSet = new AnimationSet(true);//创建一个AnimationSet对象                  AlphaAnimation alphaAnimation = new AlphaAnimation(1, 0);//创建一个AlphaAnimation对象                           alphaAnimation.setDuration(1000);//设置动画执行的时间（单位：毫秒）                       animationSet.addAnimation(alphaAnimation);//将AlphaAnimation对象添加到AnimationSet当中                        imageView.startAnimation(animationSet);//使用ImageView的startAnimation方法开始执行动画                       break;              }                    case R.id.rotateButtonId:              {                  AnimationSet animationSet = new AnimationSet(true);                        /**                 * 前两个参数定义旋转的起始和结束的度数，后两个参数定义圆心的位置                 */                  RotateAnimation rotateAnimation = new RotateAnimation(0, 360,                          Animation.RELATIVE_TO_PARENT, 1f,                          Animation.RELATIVE_TO_PARENT, 0f);                        rotateAnimation.setDuration(5000);                  animationSet.addAnimation(rotateAnimation);                  imageView.startAnimation(animationSet);                  break;              }                    case R.id.scaleButtonId:              {                  AnimationSet animationSet = new AnimationSet(true);                                    /**                 * 围绕一个点伸缩                 */                  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);                  imageView.startAnimation(animationSet);                  break;              }                    case R.id.translateButtonId:              {                  AnimationSet animationSet = new AnimationSet(true);                                    /**                 * x和y轴的起始和结束位置                 */                  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                  );                                    translateAnimation.setDuration(1000);                  animationSet.addAnimation(translateAnimation);                  imageView.startAnimation(animationSet);                  break;              }              }          }      }     

 

Animation主要有四大属性，分别是淡入淡出，绕轴旋转，变化大小，位移变化，如图：

ANIMATION  TYPE

ATTRIBUTE

VALID VALUES

Alpha

fromAlpha / toAlpha

Float from 0 to 1

 

 

Scale

fromXScale  toXScale

Float from 0 to 1

fromYScale  toYScale

Float from 0 to 1

pivotX  pivotY

String of the percentage of graphic width height from 0% to 100%

 

Translate

FromX   toX

Float from 0 to 1

fromY  toY

Float from 0 to 1

 

Rotate

fromDegrees  toDegrees

Float from 0 to 360

pivotX  pivotY

String of the percentage of graphic width height from 0% to 100%

 

这些属性还有一些共同的方法：

1.setDuration(long durationMills)

  设置动画持续时间（单位：毫秒）

2. setFillAfter(boolean fillAfter)

  如果fillAfter的值为true，则动画执行后，控件将停留在控件结束的状态。

3. setFillBefore(Boolean fillBefore)

   如果fillBefore的值为true，则动画执行后，控件将回到动画执行之前的状态。

4.setStartOffSet(long startOffSet)

  设置动画执行之前的等待时间。

5.setRepeatCount(int repeatCount)

设置动画重复执行的次数。