淡入淡出

public void FadeIn()
{
AlphaAnimation ani=new AlphaAnimation(0, 1);
ani.setDuration(1000);
this.startAnimation(ani);
this.setVisibility(View.VISIBLE);
}

public void FadeOut()
{
AlphaAnimation ani=new AlphaAnimation(1, 0);
ani.setDuration(1000);
this.startAnimation(ani);
this.setVisibility(View.INVISIBLE);
}