/**
* @param tv
* 主要判断显示的TV 内容只为一行则居中显示，内容超过两行 则左对齐
*/
public static void setTextViewGravity(final TextView tv){
ViewTreeObserver vto = tv.getViewTreeObserver();
vto.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
@Override
public boolean onPreDraw() {
if(tv.getLineCount() ==1){
tv.setGravity(Gravity.CENTER);
}else{
tv.setGravity(Gravity.LEFT|Gravity.CENTER);
}
return true;
}
});
}
