Convert pixels to sp

Question

I need the current TextSize of the TextView in sp units.

But getTextSize() returns the size in pixels. So is there a way to convert pixels to sp?

See also [this answer](http://stackoverflow.com/a/42108115/3681880) for `DP -> PX`, `PX -> DP`, `SP to PX`, and `PX to SP` conversions. — Suragch, Feb 08 '17 at 08:37

sealskej · Answer 1 · 2014-06-01T09:15:07.470

Use this

public static float pixelsToSp(Context context, float px) {
    float scaledDensity = context.getResources().getDisplayMetrics().scaledDensity;
    return px/scaledDensity;
}

If you wanna test if this method works right use this snippet

XML

<TextView
        android:id="@+id/txtHelloWorld"
        android:text="@string/hello_world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textSize="20sp"/>

<TextView
        android:id="@+id/txtHelloWorld2"
        android:text="@string/hello_world"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        />

Java

View rootView = inflater.inflate(R.layout.fragment_main, container, false);
TextView helloWorldTextView = (TextView)    rootView.findViewById(R.id.txtHelloWorld);
TextView helloWorldTextView2 = (TextView) rootView.findViewById(R.id.txtHelloWorld2);
helloWorldTextView2.setTextSize(pixelsToSp(getActivity(), helloWorldTextView.getTextSize()));

Both TextView's font size should be same.

Gabriel Negut · Accepted Answer · 2016-12-16T13:18:47.620

48

See the DisplayMetrics class, it has fields for densityDpi and scaledDensity.

Example usage:

float sp = px / getResources().getDisplayMetrics().scaledDensity;

edited Dec 16 '16 at 13:18

answered Jun 07 '11 at 09:45

Gabriel Negut

13,860
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Just to clarify: the `DisplayMetrics` class has _fields_ `densityDpi` and `scaledDensity`, not methods. And for scaling, one would want to use the `density` field rather than `densityDpi`. – Ted Hopp Apr 12 '16 at 16:58
Please answer the question asked. Saying the name of a class that can be used for an answer is not itself an answer. – Megakoresh Dec 16 '16 at 12:50

score 5 · Answer 3 · answered Dec 16 '12 at 02:41

5

weird to see public field that is adjusted at run time but it works. Standard Dpi is 160 so whatever your device Dpi is, say 240, both density and scaledDensity will show 240/160=1.5 This is how you convert between pixels and sp: px=1.5*sp

answered Dec 16 '12 at 02:41

Vlad

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Convert pixels to sp

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