android animation

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：

 

这些属性还有一些共同的方法：

 

 

下面是一个实例代码：

复制到剪贴板  JAVA代码

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;
        }
        }
    }
}