how to prevent system font-size changing effects to android application?

Question

I recently finished developing my android application. I used sp (Scaled pixels) for all textSize. The problem is when i adjusted the system font-size, my application\'s fon

Answer 1

None of the previous answers worked for me, on Android 8.1 (API 27). Here's what worked: Add the following code to your activity:

Kotlin Code:

override fun attachBaseContext(newBase: Context?) {
    super.attachBaseContext(newBase)
    val newOverride = Configuration(newBase?.resources?.configuration)
    newOverride.fontScale = 1.0f
    applyOverrideConfiguration(newOverride)
}

Java Code:

@Override
protected void attachBaseContext(Context newBase) {
    super.attachBaseContext(newBase);
    final Configuration override = new Configuration(newBase.getResources().getConfiguration());
    override.fontScale = 1.0f;
    applyOverrideConfiguration(override);
}

You don't need to change your AndroidManifest.xml.

Answer 2

I think use dp is the best way, but in some case you may want to use a font style, but the style is using sp, you can convert sp to dp by:

fun TextView.getSizeInSp() = textSize / context.resources.displayMetrics.scaleDensity

fun TextView.convertToDpSize() = setTextSize(TypedValue.COMPLEX_UNIT_DIP, getSizeInSp())

so you can use the sp value from style without dynamic font size, and no need to hardcode the font size