安卓动画详解——补间动画

private void toAlpha(){
//0为透明，1为不透明
AlphaAnimation anim=new AlphaAnimation(0,1);
//设置动画播放时间
anim.setDuration(200);
//设置动画播放结束后保持播放之后的效果
anim.setFillAfter(true);
//设置重复次数  <0  无限循环
anim.setRepeatCount(-1);

anim.setRepeatMode(Animation.REVERSE);

iv.setAnimation(anim);
}

protected void toAlpha() {
Animation anim=AnimationUtils.loadAnimation(Activity.this, R.anim.anim_alpha);
iv.startAnimation(anim);
}
<?xml version="1.0" encoding="utf-8"?>
<alpha xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="200"
android:fillAfter="true"
android:fromAlpha="0.0"
android:repeatCount="-1"
android:repeatMode="reverse"
android:toAlpha="1.0" >
</alpha>

private void toRotate(){
//其参数分别为旋转的起始角度  起始坐标  旋转参考系为自身中心
RotateAnimation anim=new RotateAnimation(0,360,RotateAnimation.RELATIVE_TO_SELF,0.5f,RotateAnimation.RELATIVE_TO_SELF,0.5f);
anim.setDuration(2000);
anim.setRepeatCount(-1);
//LinearInterpolator 动画以均匀的速率改变
//AccelerateDecelerateInterpolator 在动画开始与结束的地方速率改变比较慢，在中间的时候加速
//AccelerateInterpolator 在动画开始的地方速率比较慢，然后开始加速
//CycleInterpolator 动画循环播放特定次数，速率改变沿着正弦曲线
//DecelerateInterpolator 在动画开始的地方速率改变比较慢 然后开始减速
anim.setInterpolator(new LinearInterpolator());

iv.setAnimation(anim);
}
}

<?xml version="1.0" encoding="utf-8"?>
<rotate xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="2000"
android:fromDegrees="0"
android:pivotX="50%"
android:pivotY="50%"
android:repeatCount="2"
android:toDegrees="360" >
</rotate>

private void toTranslate(){
TranslateAnimation anim=new TranslateAnimation(0,500,0,500);
anim.setDuration(2000);
anim.setRepeatCount(-1);
anim.setRepeatMode(Animation.REVERSE);
iv.setAnimation(anim);
}

<?xml version="1.0" encoding="utf-8"?>
<translate xmlns:android="http://schemas.android.com/apk/res/android"
android:fromXDelta="10%p"
android:toXDelta="20%p"
android:fromYDelta="10%p"
android:toYDelta="20%p"
android:duration="2000"
android:repeatCount="2"
android:repeatMode="reverse">
</translate>

private void toScale(){
ScaleAnimation anim=new ScaleAnimation(0,2,0,2,
Animation.RELATIVE_TO_SELF,0.5f,
Animation.RELATIVE_TO_SELF,0.5f
);
anim.setDuration(2000);
anim.setRepeatCount(-1);
anim.setRepeatMode(Animation.REVERSE);
iv.setAnimation(anim);
}

<?xml version="1.0" encoding="utf-8"?>
<scale xmlns:android="http://schemas.android.com/apk/res/android"
android:duration="2000"
android:pivotX="50%"
android:pivotY="50%"
android:fromXScale="0.2"
android:fromYScale="0.2"
android:toXScale="2.0"
android:toYScale="2.0" >
</scale>

private void toSetAnim(){
AnimationSet as=new AnimationSet(true);
as.setDuration(1000);

TranslateAnimation anim1=new TranslateAnimation(0,0,0,500);
anim1.setDuration(1000);
anim1.setRepeatCount(-1);
anim1.setRepeatMode(Animation.REVERSE);
as.addAnimation(anim1);

RotateAnimation anim2=new RotateAnimation(0,360,RotateAnimation.RELATIVE_TO_SELF,0.5f,RotateAnimation.RELATIVE_TO_SELF,0.5f);
anim2.setDuration(1000);
anim2.setRepeatCount(-1);
anim2.setRepeatMode(Animation.REVERSE);
as.addAnimation(anim2);

iv.startAnimation(as);
}