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?

<EditText 
        android:layout_width="140dp"
        android:layout_height="20dp"
        android:background="@drawable/input_bg01"
        android:textSize="10dp"
        android:gravity="center"
        android:text="111-222-333     FOOO" />

I can use this to set text size, but what about the layout_width and height?

edTxt.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 10);

Is there a way to tell the code to use DP unit instead of pixel? Or a conversion function to convert DP into pixel?

Does this answer your question? [What is textview.setTextSize()?](https://stackoverflow.com/questions/23590943/what-is-textview-settextsize) — Fattie, Mar 03 '21 at 14:27
Does this answer your question? [Android specifying pixel units (like sp, px, dp) without using XML](https://stackoverflow.com/questions/5012840/android-specifying-pixel-units-like-sp-px-dp-without-using-xml) — Ryan M, Mar 04 '21 at 09:03

score 95 · Answer 1 · edited Mar 19 '13 at 13:46

95

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.

edited Mar 19 '13 at 13:46

Steven Byle

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answered Jul 23 '12 at 08:08

Santosh

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score 51 · Accepted Answer · edited May 23 '17 at 12:26

51

Solved here.

Extract:

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

edited May 23 '17 at 12:26

Community

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answered Feb 17 '11 at 17:19

sven

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note, it would be `.scaledDensity` BUT this solution DOES NOT now seem to work on modern androids (it comes out way too big) – Fattie Mar 03 '21 at 14:31
.. when setting the text size – Fattie Mar 03 '21 at 15:42

score 22 · Answer 3 · edited Nov 01 '17 at 21:34

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.

Fattie · Answer 4 · 2021-03-28T01:43:08.227

Regarding setting the TEXT SIZE:

For 2021 ...

Fortunately, the correct modern answer is just

textView.setTextSize(TypedValue.COMPLEX_UNIT_DIP, 25);

or you can use COMPLEX_UNIT_SP, etc.

Exactly matches xml for text size:

Checked, on all devices this produces exactly the same result as just setting it in xml:

Regarding setting, say, a layout parameter:

int h = 66; // the new value
ViewGroup.LayoutParams p = some_frame.getLayoutParams();
float fdp = TypedValue.applyDimension(
    TypedValue.COMPLEX_UNIT_DIP,
    h,
    getResources().getDisplayMetrics());
p.height = Math.round(fdp);
some_frame.setLayoutParams(p);

This appears to work correctly, on a test device. The value "h" is now the "same" as simply in the xml, enter 66dp.

score 0 · Answer 5 · answered Mar 30 '23 at 14:00

For Kotlin to increase/decrease font size with below logic. It works in 2

 `  private var fontSize: Float = 17F //default font size
    
    btnTextDecrease.setOnClickListener {
       if (fontSize <= 13F) {return@setOnClickListener}
       fontSize -= 0.5F
       etBook.setTextSize(TypedValue.COMPLEX_UNIT_SP, fontSize)
       Toast.makeText(activity, "Decrease Size$fontSize", Toast.LENGTH_SHORT).show()
    }

    btnTextIncrease.setOnClickListener {
       fontSize += 0.5F
       etBook.setTextSize(TypedValue.COMPLEX_UNIT_SP, fontSize)
       Toast.makeText(activity, "Increase Size$fontSize", Toast.LENGTH_SHORT).show()
    }`

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

5 Answers5

Regarding setting the TEXT SIZE:

Exactly matches xml for text size:

Regarding setting, say, a layout parameter:

Linked