Android常用知识点

EditText对密码的显示与隐藏

显示：edt_pwd.setInputType(InputType.TYPE_TEXT_VARIATION_VISIBLE_PASSWORD);

隐藏：edt_pwd.setInputType(InputType.TYPE_CLASS_TEXTInputType.TYPE_TEXT_VARIATION_PASSWORD);
动态addView时设置padding和margin值

padding:

ImageView img = new ImageView(Context context);

img.setPadding(left,top,right,bottom);

margin:

LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(

width, height);

params.setMargins(left,top,right,bottom);