Fix #5625: Migrate away from scaledDensity (#5644)

This PR updates the `FontScaleConfigurationUtil` class to remove the
usage of the deprecated `scaledDensity` property and replace it with
`TypedValue.applyDimension` for scaling font sizes. This change ensures
that the code adheres to modern Android API standards .

Fixes #5625: This issue was related to the usage of the deprecated
`scaledDensity` property

### Changes:
  **Removed deprecated `scaledDensity`:**
- Updated the `adjustFontScale` method to calculate the scaled density
using `TypedValue.applyDimension`.
- Applied the new scaled density without using the deprecated property.
## Essential Checklist
<!-- Please tick the relevant boxes by putting an "x" in them. -->
- [x] The PR title and explanation each start with "Fix #bugnum: " (If
this PR fixes part of an issue, prefix the title with "Fix part of
#bugnum: ...".)
- [ x] Any changes to
[scripts/assets](https://github.com/oppia/oppia-android/tree/develop/scripts/assets)
files have their rationale included in the PR explanation.
- [x ] The PR follows the [style
guide](https://github.com/oppia/oppia-android/wiki/Coding-style-guide).
- [ x] The PR does not contain any unnecessary code changes from Android
Studio
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#undo-unnecessary-changes)).
- [x ] The PR is made from a branch that's **not** called "develop" and
is up-to-date with "develop".
- [ x] The PR is **assigned** to the appropriate reviewers
([reference](https://github.com/oppia/oppia-android/wiki/Guidance-on-submitting-a-PR#clarification-regarding-assignees-and-reviewers-section)).

---------

Co-authored-by: Adhiambo Peres <59600948+adhiamboperes@users.noreply.github.com>

app/src/main/java/org/oppia/android/app/utility/FontScaleConfigurationUtil.kt

@@ -3,6 +3,7 @@ package org.oppia.android.app.utility
 import android.content.Context
 import android.content.Context.WINDOW_SERVICE
 import android.util.DisplayMetrics
+import android.util.TypedValue
 import android.view.WindowManager
 import org.oppia.android.app.model.ReadingTextSize
 import javax.inject.Inject
@@ -21,16 +22,18 @@ class FontScaleConfigurationUtil @Inject constructor() {
     // TODO(#3616): Migrate to the proper SDK 30+ APIs.
     @Suppress("DEPRECATION") // The code is correct for targeted versions of Android.
     windowManager!!.defaultDisplay.getMetrics(metrics)
-    // TODO(#5625): Migrate away from scaledDensity.
+    val scaledDensity = TypedValue.applyDimension(
+      TypedValue.COMPLEX_UNIT_SP, 1.0f, metrics
+    ) * configuration.fontScale
     @Suppress("DEPRECATION")
-    metrics.scaledDensity = configuration.fontScale * metrics.density
+    metrics.scaledDensity = scaledDensity
     context.createConfigurationContext(configuration)
     context.resources.displayMetrics.setTo(metrics)
   }
 
   private fun getReadingTextSizeConfigurationUtil(readingTextSize: ReadingTextSize): Float {
     return when (readingTextSize) {
-      ReadingTextSize.SMALL_TEXT_SIZE -> .8f
+      ReadingTextSize.SMALL_TEXT_SIZE -> 0.8f
       ReadingTextSize.MEDIUM_TEXT_SIZE -> 1.0f
       ReadingTextSize.LARGE_TEXT_SIZE -> 1.2f
       ReadingTextSize.EXTRA_LARGE_TEXT_SIZE -> 1.4f