android动画特效之解决解决移动后闪烁现象，解决输入法弹出后位置回复原状，解决两个动画叠加

以下代码实现的效果是：

BoundOpenView从居中移动到顶部，移动完后，BoundSendView从隐藏变为显示，并从顶部移动BoundOpenView下方20dp处，同时透明度慢慢增加。

private void BoundOpenViewAnimation() {
Log.i(TAG, "BoundOpenViewAnimation");
final int top = BoundOpenView.getTop()
- DensityUtil.dip2px(mContext, 20);
final int height = BoundOpenView.getHeight();
TranslateAnimation animation = new TranslateAnimation(0, 0, 0, 0 - top);
animation.setDuration(200);// 设置动画持续时间
BoundOpenView.clearAnimation();
BoundOpenView.setAnimation(animation);
animation.setFillAfter(true);
// ** 开始动画 *//*
animation.setAnimationListener(new AnimationListener() {

@Override
public void onAnimationEnd(Animation animation) {
//BoundOpenView.clearAnimation();// 解决移动后闪烁现象
TranslateAnimation anim = new TranslateAnimation(0, 0, 0,
0);
BoundOpenView.setAnimation(anim);
//解决输入法弹出后位置回复原状
RelativeLayout.LayoutParams lp = new RelativeLayout
.LayoutParams(BoundOpenView.getWidth(),BoundOpenView.getHeight());
//lp.topMargin=DensityUtil.dip2px(mContext, 20);
lp.addRule(RelativeLayout.ALIGN_PARENT_TOP);
BoundOpenView.setLayoutParams(lp);
int move = height + DensityUtil.dip2px(mContext, 20);
BoundSendViewAnimation(move);
}

@Override
public void onAnimationRepeat(Animation animation) {
}

@Override
public void onAnimationStart(Animation animation) {

}
});
animation.startNow();
}

private void BoundSendViewAnimation(int move) {

Log.i(TAG, "move:"+move);
Animation translateanimation = new TranslateAnimation(0, 0, 0, move);
translateanimation.setDuration(400);// 设置动画持续时间
Animation alphaAnimation=new AlphaAnimation(0.01f,1.0f);
alphaAnimation.setDuration(500);// 设置动画持续时间
//动画叠加
AnimationSet set=new AnimationSet(true);    //创建动画集对象
set.addAnimation(translateanimation);       //添加位置变化动画
set.addAnimation(alphaAnimation);           //添加尺寸变化动画
set.setFillAfter(true);                 //停留在最后的位置
set.setFillEnabled(true);
BoundSendView.clearAnimation();
BoundSendView.setAnimation(set);                    //设置动画
BoundSendView.setVisibility(View.VISIBLE);

// ** 开始动画 *//*
set.setAnimationListener(new AnimationListener() {

@Override
public void onAnimationEnd(Animation animation) {
TranslateAnimation anim = new TranslateAnimation(0, 0, 0,
0);
BoundSendView.setAnimation(anim);
RelativeLayout.LayoutParams lp = new RelativeLayout
.LayoutParams(BoundSendView.getWidth(),BoundSendView.getHeight());

lp.addRule(RelativeLayout.BELOW,R.id.bound_open_view);
lp.topMargin=DensityUtil.dip2px(mContext, 20);
BoundSendView.setLayoutParams(lp);
}

@Override
public void onAnimationRepeat(Animation animation) {
// TODO Auto-generated method stub

}

@Override
public void onAnimationStart(Animation animation) {
// TODO Auto-generated method stub

}

});
set.startNow();                         //启动动画
}

DensityUtil类：

import android.content.Context;

public class DensityUtil {
/**
* 根据手机的分辨率从 dp 的单位 转成为 px(像素)
*/
public static int dip2px(Context context, float dpValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (dpValue * scale + 0.5f);
}

/**
* 根据手机的分辨率从 px(像素) 的单位 转成为 dp
*/
public static int px2dip(Context context, float pxValue) {
final float scale = context.getResources().getDisplayMetrics().density;
return (int) (pxValue / scale + 0.5f);
}
}