動態控制控件大小

android中我們需要動態控制控件大小，可以設置控件的LayoutParams。

ImageView imageView = new ImageView(this);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
layoutParams.setMargins(30, 20, 30, 0);//設置left,top,right, bottom
imageView.setLayoutParams(layoutParams);