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Android Animation

button.getPivotX()*2  == button's  width

button.getX()  ==  button's  absolute x



   float   sx1 = button.getPivotX(),    sy1=button.getScaleY(),   sy2=textView.getScaleY();


    TranslateAnimation translateAnimation=new TranslateAnimation (
        Animation.ABSOLUTE,      0f,        Animation.ABSOLUTE,      sx1,        
        Animation.ABSOLUTE,      0f,         Animation.ABSOLUTE,     sy1+sy2 );


     translateAnimation.setFillAfter(true);  
     translateAnimation.setDuration(1000);


textView.startAnimation(translateAnimation);


animation. setRepeatCount ( 10 );
animation. setRepeatMod  ( Animation. REVERSE );





四、具体实现
2、.java文件

Animation Set :


           AnimationSet animationSet = new AnimationSet(true);

           animationSet.addAnimation(alphaAnimation);








AlphaAnimation :

           AlphaAnimation alphaAnimation = new AlphaAnimation(1, 0);

ScaleAnimation :

           ScaleAnimation scaleAnimation = new ScaleAnimation(
                  0, 0.1f,0,0.1f,
                  Animation.RELATIVE_TO_SELF,0.5f,
                  Animation.RELATIVE_TO_SELF,0.5f);

TranslateAnimation :

           TranslateAnimation translateAnimation =
              new TranslateAnimation(
                  Animation.RELATIVE_TO_SELF,0f,
                  Animation.RELATIVE_TO_SELF,0.5f,
                  Animation.RELATIVE_TO_SELF,0f,
                  Animation.RELATIVE_TO_SELF,0.5f);

RotationAnimation :


Tween Animations的通用方法

　　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，控件将停留在执行结束的状态
　　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

在代码中使用Animations可以很方便的调试、运行，但是代码的可重用性差，重复代码多。同样可以在xml文件中配置Animations，这样做可维护性变高了，只不过不容易进行调试。
一、在xml中使用Animations步骤
       1.在res文件夹下建立一个anim文件夹；
       2.创建xml文件，并首先加入set标签，更改标签如下：
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator">
</set>
3.在该标签当中加入rotate，alpha，scale或者translate标签；
<alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.0"
        android:startOffset="500"
        android:duration="500"/>
4.在代码当中使用AnimationUtils当中装载xml文件，并生成Animation对象。因为Animation是AnimationSet的子类，所以向上转型，用Animation对象接收。
Animation animation = AnimationUtils.loadAnimation(
                  Animation1Activity.this, R.anim.alpha);
           // 启动动画
           image.startAnimation(animation);
二、具体实现
 1、  alpha.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator">
    <!-- fromAlpha和toAlpha是起始透明度和结束时透明度 -->
    <alpha
        android:fromAlpha="1.0"
        android:toAlpha="0.0"
        android:startOffset="500"
        android:duration="500"/>
</set>
2、  rotate.xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator">
    <!--
        fromDegrees:开始的角度
        toDegrees：结束的角度，+表示是正的
        pivotX：用于设置旋转时的x轴坐标
        例
           1)当值为"50"，表示使用绝对位置定位
           2)当值为"50%"，表示使用相对于控件本身定位
           3)当值为"50%p"，表示使用相对于控件的父控件定位
        pivotY：用于设置旋转时的y轴坐标
      -->
    <rotate
        android:fromDegrees="0"
        android:toDegrees="+360"
        android:pivotX="50%"
        android:pivotY="50%"
        android:duration="1000"/>
</set>
3、  scale.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator">
   <!--
       起始x轴坐标
           止x轴坐标
           始y轴坐标
           止y轴坐标
           轴的坐标
           轴的坐标
     -->
   <scale
       android:fromXScale="1.0"
       android:toXScale="0.0"
       android:fromYScale="1.0"
       android:toYScale="0.0"
       android:pivotX="50%"
       android:pivotY="50%"
       android:duration="1000"/>
</set>

4、  translate.xml
<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:anim/accelerate_interpolator">
    <!--
           始x轴坐标
           止x轴坐标
           始y轴坐标
           止y轴坐标
      -->
    <translate
        android:fromXDelta="0%"
        android:toXDelta="100%"
        android:fromYDelta="0%"
        android:toYDelta="100%"
        android:duration="2000"/>
</set>

5、  .java文件
importandroid.app.Activity;
importandroid.os.Bundle;
importandroid.view.View;
importandroid.view.View.OnClickListener;
import android.view.animation.Animation;
importandroid.view.animation.AnimationUtils;
import android.widget.Button;
import android.widget.ImageView;

public class Animation1Activity extends Activity {
    private Button rotateButton = null;
    private Button scaleButton = null;
    private Button alphaButton = null;
    private Button translateButton = null;
    private ImageView image = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.main);

       rotateButton = (Button) findViewById(R.id.rotateButton);
       scaleButton = (Button) findViewById(R.id.scaleButton);
       alphaButton = (Button) findViewById(R.id.alphaButton);
       translateButton = (Button) findViewById(R.id.translateButton);
       image = (ImageView) findViewById(R.id.image);

       rotateButton.setOnClickListener(newRotateButtonListener());
       scaleButton.setOnClickListener(newScaleButtonListener());
       alphaButton.setOnClickListener(newAlphaButtonListener());
       translateButton.setOnClickListener(newTranslateButtonListener());
    }

    class AlphaButtonListener implementsOnClickListener {
       public void onClick(View v) {
           // 使用AnimationUtils装载动画配置文件
           Animation animation = AnimationUtils.loadAnimation(
                  Animation1Activity.this, R.anim.alpha);
           // 启动动画
           image.startAnimation(animation);
       }
    }

    class RotateButtonListener implementsOnClickListener {
       public void onClick(View v) {
           Animation animation = AnimationUtils.loadAnimation(
                  Animation1Activity.this, R.anim.rotate);
           image.startAnimation(animation);
       }
    }

    class ScaleButtonListener implementsOnClickListener {
       public void onClick(View v) {
           Animation animation = AnimationUtils.loadAnimation(
                  Animation1Activity.this, R.anim.scale);
           image.startAnimation(animation);
       }
    }

    class TranslateButtonListener implementsOnClickListener {
       public void onClick(View v) {
           Animation animation = AnimationUtils.loadAnimation(Animation1Activity.this, R.anim.translate);
           image.startAnimation(animation);
       }
    }
}

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