How do I set Layout and Text size to DP inside program?

Question

Basically I have this inside XML, but I have to recreate it inside a code. How do I do it?

Answer 1

Solved here.

Extract:

DisplayMetrics metrics = getContext().getResources().getDisplayMetrics();
float dp = 20f;
float fpixels = metrics.density * dp;
int pixels = (int) (fpixels + 0.5f);

Answer 2

Just for completeness: Another solution (which I'd prefer) for the question is given here

setTextSize(float) expects a scaled pixel value. So, setTextSize(10) would give you the desired result. However, getDimension() and getDimensionPixelSize() return the size in units of pixels.

So for your example it would be

setTextSize(TypedValue.COMPLEX_UNIT_PX, getResources().getDimensionPixelSize(R.dimen.edTxt_text_size));

where <dimen name="edtxt_text_size">10dp</dimen> is set in your dimens.xml file for example.

Answer 3

You can use:

float pixels = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 10, getResources().getDisplayMetrics());

Now the value of pixels is equivalent to 10dp at the device's current screen density.

The TypedValue contains other similar methods that help in conversion.