学步园

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);  
    }  
}