使用代码设置图像布局（Android Studio）(Setting image layouts using code (Android Studio))

 我有一个包含布局的活动。 我在此布局中设置了10个图像按钮，并隐藏（不可见）。 我试图以编程方式将图像加载到这些图像按钮，然后在屏幕上设置它们的位置。 
 
 我之前的讨论已经找到了： 如何使用代码设置ImageView的边距，而不是xml 
 
 但是，这不起作用。 尽管设置了高度和宽度参数，但我得到了微小的图像按钮。 这是我的代码： 
 
RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(btnGP1.getLayoutParams());
            lp1.leftMargin = P1leftValue;
            lp1.topMargin = P1topValue;
            lp1.height = 80;
            lp1.width = 80;
            btnGP1.setLayoutParams(lp1);
 
 关于这一点的事情是不对的，但我没有找到更准确的资源。 有任何想法吗？ 
 
 更新： 
 
 我编写了我的代码： 
 
            RelativeLayout.LayoutParams lp1 = (RelativeLayout.LayoutParams)btnGP1.getLayoutParams();
            lp1.leftMargin = P1leftValue;
            lp1.topMargin = P1topValue;
            lp1.height = 280;
            lp1.width = 280;
            btnGP1.setLayoutParams(lp1);
 
 它似乎几乎正常工作。 现在唯一剩下的就是上面的函数似乎只允许我输入像素大小。 我需要能够输入像素密度，因为并非所有屏幕尺寸都相同。 
 
 我的新问题是：我该如何解决这个问题？ 这里有一个简单的答案吗？ 如果我尝试280dp或“280dp”，编译器将不允许它。 

I have an activity, containing a layout. I have a pool of 10 imagebuttons set up and hidden (invisible) in this layout. I am trying to load the image to these imagebuttons programmatically, and then set their location on the screen.
 
I have found this previous discussion: How to set margin of ImageView using code, not xml
 
This, however, does not work. I am getting tiny imagebuttons as a result, despite setting the height and width parameters. Here is my code:
 
RelativeLayout.LayoutParams lp1 = new RelativeLayout.LayoutParams(btnGP1.getLayoutParams());
            lp1.leftMargin = P1leftValue;
            lp1.topMargin = P1topValue;
            lp1.height = 80;
            lp1.width = 80;
            btnGP1.setLayoutParams(lp1);
 
Something about this is not right, but I am not having any luck finding a more accurate resource. Any ideas?
 
Update:
 
I have edited my code to this:
 
            RelativeLayout.LayoutParams lp1 = (RelativeLayout.LayoutParams)btnGP1.getLayoutParams();
            lp1.leftMargin = P1leftValue;
            lp1.topMargin = P1topValue;
            lp1.height = 280;
            lp1.width = 280;
            btnGP1.setLayoutParams(lp1);
 
And it appears to be almost working. The only thing that remains now is that the functions above only appear to be allowing me to enter pixel sizes. I need to be able to enter pixel densities instead as not all screen sizes are the same.
 
My new question is this: how do I go about this? Is there a simple answer here? If I try 280dp or "280dp" the compiler will not allow it.

原文：https://stackoverflow.com/questions/30055314