tween动画

<?xml version="1.0" encoding="utf-8"?><alpha xmlns:android="http://schemas.android.com/apk/res/android"    android:fromAlpha="0.0"    android:toAlpha="1.0"    android:duration="2000"    android:repeatCount="0"    android:repeatMode="restart"    ></alpha>

<?xml version="1.0" encoding="utf-8"?><rotate xmlns:android="http://schemas.android.com/apk/res/android"    android:fromDegrees="0"    android:toDegrees="90"    android:pivotX="50%p"    android:pivotY="50%p"    android:duration="2000"    ></rotate>

<?xml version="1.0" encoding="utf-8"?><scale xmlns:android="http://schemas.android.com/apk/res/android"     android:duration="2000"    android:fromXScale="0.0"    android:toXScale="2.0"    android:fromYScale="0.0"    android:toYScale="2.0"    android:repeatMode="reverse"    android:repeatCount="1"    ></scale>

<?xml version="1.0" encoding="utf-8"?><set xmlns:android="http://schemas.android.com/apk/res/android" >    <alpha        android:duration="2000"        android:fromAlpha="0.0"        android:repeatCount="0"        android:repeatMode="restart"        android:toAlpha="1.0" />    <rotate        android:duration="2000"        android:fromDegrees="0"        android:pivotX="50%p"        android:pivotY="50%p"        android:toDegrees="90" />    <scale        android:duration="2000"        android:fromXScale="0.0"        android:fromYScale="0.0"        android:repeatCount="1"        android:repeatMode="reverse"        android:toXScale="2.0"        android:toYScale="2.0" /></set>

<?xml version="1.0" encoding="utf-8"?><translate xmlns:android="http://schemas.android.com/apk/res/android"     android:duration="2000"    android:fromXDelta="0"    android:toXDelta="100"    android:fromYDelta="0"    android:toYDelta="100"    android:startOffset="1000"    ></translate>

package cn.itcast.anim;import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.animation.AlphaAnimation;import android.view.animation.Animation;import android.view.animation.AnimationSet;import android.view.animation.AnimationUtils;import android.view.animation.RotateAnimation;import android.view.animation.ScaleAnimation;import android.view.animation.TranslateAnimation;import android.widget.ImageView;public class DemoActivity extends Activity {private ImageView iv;    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.main);        iv = (ImageView) this.findViewById(R.id.iv);    }            /**     * 点击事件播放透明度变化的动画      *      */    public void alpha(View view){//完全透明到完全不透明//    AlphaAnimation aa = new AlphaAnimation(0.0f, 1.0f);//    aa.setDuration(2000);//也可以用布局里面的布局    Animation aa = AnimationUtils.loadAnimation(this, R.anim.alpha);//1得到动画  2imageview开始动画    iv.startAnimation(aa);        }    /**     * 播放选择变化的动画      *      */    public void rotate(View view){    //RotateAnimation ra = new RotateAnimation(0, 90);    //RotateAnimation ra = new RotateAnimation(0, 90, (iv.getRight()+iv.getLeft())/2, (iv.getTop()+iv.getBottom())/2);    // 怎么去定义旋转的中间位置?//    RotateAnimation ra = new RotateAnimation(0, 90, 0.5f, 0.5f);//    ra.setDuration(2000);    Animation ra = AnimationUtils.loadAnimation(this, R.anim.rotate);    iv.startAnimation(ra);    }            public void scale(View view){//    ScaleAnimation sa = new ScaleAnimation(0.0f, 2.0f, 0.0f, 2.0f);//    sa.setDuration(2000);    Animation sa  = AnimationUtils.loadAnimation(this, R.anim.scale);            iv.startAnimation(sa);    }            public  void translate(View view){//    TranslateAnimation ta = new TranslateAnimation(0, 200, 0, 200);//    ta.setDuration(2000);    Animation ta  = AnimationUtils.loadAnimation(this, R.anim.translate);    iv.startAnimation(ta);    }        /**     * 动画的组合     */    public void set(View view){//    AlphaAnimation aa = new AlphaAnimation(0.0f, 1.0f);//    aa.setDuration(2000);//    RotateAnimation ra = new RotateAnimation(0, 90);//    ra.setDuration(2000);//    TranslateAnimation ta = new TranslateAnimation(0, 200, 0, 200);//    ta.setDuration(2000);//得到动画集//    AnimationSet set = new AnimationSet(false);//    set.addAnimation(ta);//    set.addAnimation(ra);//    set.addAnimation(aa);//将动画都放入后,开始动画集.//    iv.startAnimation(set);    Animation aa = AnimationUtils.loadAnimation(this, R.anim.set);    iv.startAnimation(aa);    }    }