Font size of TextView in Android application changes on changing font size from native settings

Question

I want to specify my own text size in my application  but I am having a problem doing this    When I change the font size in the device settings  the font size of my application TextView also changes

User · Answer

this solutions is with Kotlin and without using the deprecated function resources.updateConfiguration

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        adjustFontScale(resources.configuration)
    }

    private fun adjustFontScale(configuration: Configuration?) {
        configuration?.let {
            it.fontScale = 1.0F
            val metrics: DisplayMetrics = resources.displayMetrics
            val wm: WindowManager = getSystemService(Context.WINDOW_SERVICE) as WindowManager
            wm.defaultDisplay.getMetrics(metrics)
            metrics.scaledDensity = configuration.fontScale * metrics.density

            baseContext.applicationContext.createConfigurationContext(it)
            baseContext.resources.displayMetrics.setTo(metrics)

        }
    }

Observation: this is the same solution as the above but udpated with Kotlin

User · Answer

It is not a good thing to have to specify DIP or SP again by code when already defined in a dimen xml file   I think that the best option is to use PX when using a dimen xml value    tv setTextSize TypedValue COMPLEX UNIT PX  getResources   getDimensionPixelSize R dimen txt size      This way  you can switch from DP to SP if needed in dimen xml file without having to change any code

User · Answer

change the DP to sp it is good pratice for android android textSize  18sp

User · Answer

The easiest to do so is simply to use something like the following   android textSize  32sp    If you d like to know more about the textSize property  you can check the Android developer documentation

User · Answer

for kotlin  it works for me  priceTextView textSize   12f

User · Answer

Actually  Settings font size affects only sizes in sp  So all You need to do - define textSize in dp instead of sp  then settings won t change text size in Your app   Here s a link to the documentation  Dimensions  However please note that the expected behavior is that the fonts in all apps respect the user s preferences  There are many reasons a user might want to adjust the font sizes and some of them might even be medical - visually impaired users  Using dp instead of sp for text might lead to unwillingly discriminating against some of your app s users   i e    android textSize  32dp

User · Answer

You can use this code   android textSize  32dp    it solves your problem but you must know that you should respect user decisions  by this  changing text size from device settings will not change this value  so that s why you need to use sp instead of dp  So my suggestion is to review your app with different system font sizes small normal big

User · Answer

If units used are SP  not DP  and you want to override system font scaling  all you do is override one method in activity - see this post   resources updateConfiguration is deprecated and buggy  on Oreo I had issues with formatted text

User · Answer

in android 8 this solution work for me   add this code in base activity    Override protected void attachBaseContext Context newBase        super attachBaseContext newBase       final Configuration override   new Configuration newBase getResources   getConfiguration         override fontScale   1 0f      applyOverrideConfiguration override       source https   stackoverflow com a 57225687 7985871

User · Answer

Also note that if the textSize is set in code  calling textView setTextSize X  interprets the number  X  as SP  Use setTextSize TypedValue COMPLEX UNIT DIP  X  to set values in dp

User · Answer

simple way to prevent the whole app from getting effected by system font size is to updateConfiguration using a base activity     in base activity add this code  public  void adjustFontScale  Configuration configuration         configuration fontScale    float  1 0      DisplayMetrics metrics   getResources   getDisplayMetrics        WindowManager wm    WindowManager  getSystemService WINDOW SERVICE       wm getDefaultDisplay   getMetrics metrics       metrics scaledDensity   configuration fontScale   metrics density      getBaseContext   getResources   updateConfiguration configuration  metrics        Override protected void onCreate  Nullable Bundle savedInstanceState        super onCreate savedInstanceState       adjustFontScale  getResources   getConfiguration

User · Answer

this may help  add the code in your custom Application or BaseActivity            getResource                    return      Override public Resources getResources         Resources resources   super getResources        if  resources    null  amp  amp  resources getConfiguration   fontScale    1            Configuration configuration   resources getConfiguration            configuration fontScale   1          resources updateConfiguration configuration  resources getDisplayMetrics               return resources      however  Resource updateConfiguration is deplicated in API level 25  which means it will be unsupported some day in the future

User · Answer

Use the dimension type of resources like you use string resources  DOCS   In your dimens xml file  declare your dimension variables   lt  xml version  quot 1 0 quot  encoding  quot utf-8 quot   gt   lt resources gt     lt dimen name  quot textview height quot  gt 25dp lt  dimen gt     lt dimen name  quot textview width quot  gt 150dp lt  dimen gt     lt dimen name  quot ball radius quot  gt 30dp lt  dimen gt     lt dimen name  quot font size quot  gt 16sp lt  dimen gt   lt  resources gt   Then you can use these values like this   lt TextView    android layout height  quot  dimen textview height quot     android layout width  quot  dimen textview width quot     android textSize  quot  dimen font size quot   gt   You can declare different dimens xml files for different types of screens  Doing this will guarantee the desired look of your app on different devices  When you don t specify android textSize the system uses the default values

User · Answer

Override getResources   in Activity   Set TextView s size in sp as usual like android textSize  32sp   override fun getResources    Resources       return super getResources   apply           configuration fontScale   1F         updateConfiguration configuration  displayMetrics

[android] Font size of TextView in Android application changes on changing font size from native settings

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