android top弹出框(2)

                0.0f, Animation.RELATIVE_TO_SELF, 0.0f,Animation.RELATIVE_TO_SELF,-1.0f, 
                Animation.RELATIVE_TO_SELF,0.0f); 
        showaction.setDuration(500); 
        //隐藏动画 
        hideaction=new TranslateAnimation(Animation.RELATIVE_TO_SELF,  
                0.0f, Animation.RELATIVE_TO_SELF, 0.0f,Animation.RELATIVE_TO_SELF,0.0f, 
                Animation.RELATIVE_TO_SELF,-1.0f); 
        hideaction.setDuration(500); 
        menushowed=false; 
        menu.setVisibility(View.GONE); 
        button.setOnClickListener(new OnClickListener() 
        { 
             
            @Override 
            public void onClick(View v) 
            { 
                if(menushowed) 
                { 
                    menushowed=false; 
                    menu.startAnimation(hideaction); 
                    menu.setVisibility(View.GONE); 
                } 
                else  
                { 
                    menushowed=true; 
                    menu.startAnimation(showaction); 
                    menu.setVisibility(View.VISIBLE);