Programmatically Inflate View with pre-defined measures

Question

I have a layout resource like this and a I want to inflate it with the layout width and height:

Answer 1

One option is to define constants for layout_width and layout_height in the form of attributes and access them programatically in getBitmap.

Answer 2

This example should work. Might take some tweaking to get it perfect, depending on your needs, but give it a shot:

//Get a bitmap from a layout resource. Inflates it into a discarded LinearLayout
//so that the LayoutParams are preserved
public static Bitmap getLayoutBitmap (Context c, int layoutRes, int maxWidth, int maxHeight) {
    View view = LayoutInflater.from(c).inflate(layoutRes, new LinearLayout(c), false);
    return getViewBitmap(view, maxWidth, maxHeight);
}

public static Bitmap getViewBitmap (View v, int maxWidth, int maxHeight) {
    ViewGroup.LayoutParams vParams = v.getLayoutParams();

    //If the View hasn't been attached to a layout, or had LayoutParams set
    //return null, or handle this case however you want
    if (vParams == null) {
        return null;
    }

    int wSpec = measureSpecFromDimension(vParams.width, maxWidth);
    int hSpec = measureSpecFromDimension(vParams.height, maxHeight);

    v.measure(wSpec, hSpec);

    final int width = v.getMeasuredWidth();
    final int height = v.getMeasuredHeight();

    //Cannot make a zero-width or zero-height bitmap
    if (width == 0 || height == 0) {
        return null;
    }

    v.layout(0, 0, width, height);

    Bitmap result = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    Canvas canvas = new Canvas(result);
    v.draw(canvas);

    return result;
}

private static int measureSpecFromDimension (int dimension, int maxDimension) {
    switch (dimension) {
        case ViewGroup.LayoutParams.MATCH_PARENT:
            return View.MeasureSpec.makeMeasureSpec(maxDimension, View.MeasureSpec.EXACTLY);
        case ViewGroup.LayoutParams.WRAP_CONTENT:
            return View.MeasureSpec.makeMeasureSpec(maxDimension, View.MeasureSpec.AT_MOST);
        default:
            return View.MeasureSpec.makeMeasureSpec(dimension, View.MeasureSpec.EXACTLY);
    }
}