如何以编程方式在 Android 中的按钮中缩放或自动适应 Drawable Top 的图像？

我正在开发一个应用程序，我在一个 GridView 中加载几个按钮。

<?xml version="1.0" encoding="utf-8"?>
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
      android:layout_width="fill_parent"
      android:paddingLeft="25dp"
      android:paddingRight="25dp"
      android:paddingTop="5dp"
      android:paddingBottom="5dp"
      android:layout_height="wrap_content"
      android:gravity="center"
      android:orientation="vertical">
    <GridView
        android:id="@+id/gridview"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:columnWidth="128dp"
        android:numColumns="auto_fit"
        android:verticalSpacing="5dp"
        android:horizontalSpacing="5dp"
        android:stretchMode="columnWidth"
        android:gravity="center" />
  </LinearLayout>

这些按钮是通过适配器动态添加的，但是如果我在某些设备中预定义了边界 (320x320) 在其他设备中太小或太大并且如果我选择了内在边界，它们总是微缩的。

预定义边界（320x320）：

智能手机视图：

平板电脑视图：

内在边界 (136x136)：

我将图像存储在Assets目录中，您的第一个问题是为什么？

You could tell me me that I should save them in the Resources/drawable and I'm aware of it, but I have more than 100 images and each of them are stored in a sub-folders with a unique IDs, which can contains at least one image with an ID like this one: 1.jpg, 2.jpg, etc.

As you can appreciate if I move all those images and sub-directories to the drawable folder, it just not going to work (Can the Android drawable directory contain subdirectories?).

I have this function in order to get the Drawable from the Assets folder:

public Drawable GetImage(int ID)
{
    var thumbnail = string.Format("Thumbnails/{0}/1.jpg", ID);
    using (StreamReader sr = new StreamReader(Application.Context.Assets.Open(thumbnail)))
    {
        Drawable d = Drawable.CreateFromStream(sr.BaseStream, null);

        d.SetBounds(0, 0, 320, 320);

        return d;
    }
}

Here is how I load the data in the Adapter to the Buttons:

btnRecipe.Text = data[position].name;
btnRecipe.SetHeight(560);
//            btnRecipe.SetWidth(122);
// btnRecipe.SetCompoundDrawablesWithIntrinsicBounds();
btnRecipe.SetTextColor(new Android.Graphics.Color(255, 255, 255));
btnRecipe.SetCompoundDrawables(null, data[position].image, null, null);

I'd like to know if there is any way to deal or Auto Fit the images because I have another example that with data from the Drawable folder and XML code the image is scaled without anything else for example:

Code:

<Button
    android:text="@string/BtnComidas"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:textColor="@color/my_white"
    android:id="@+id/BtnComidas"
    android:drawableTop="@drawable/comidas" />

Also, I'd like to clarify that this image is smaller 128x128 than the previous ones (136x136), furthermore, it looks much better and I have just one copy of the image in the Drawable folder, I don't have a hdpi or a mdpi copies and as you can see it looks great in smartphones and tablets, I didn't need to do any additional change in order to scale it.

A possible questions and answer, why am I using a GridView in order to load the buttons? If I should use another control or Layout, for instance.

I didn't know another way in order to display an image and text at the same time and I was able to handle the click event as I expected.

Besides, I'm open to any suggestion if someone has another approach of how displaying several images with text in a GridView or something else that could solve my current problem. Thanks for your help, time, experience and worthy knowledge.