1. 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);

  2. 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);