一、如果控件已经在布局文件中声明，则在代码中直接用控件实例获取布局对象：

LinearLayout.LayoutParams layoutParams  = mTextView.getLayoutParams();

然后再去设置相关设置（margins，width，height, gravity）.

二、若是new出来的控件，则：

TextView textView =newTextView(this);

LinearLayout.LayoutParams layoutParams =newLinearLayout.LayoutParams(300,900);

layoutParams.setMargins(22,90,88,22);

layoutParams.gravity= Gravity.CENTER;

textView.setPadding(30,33,22,11);

textView.setLayoutParams(layoutParams);