Allow user to switch b/w default & custom lato font

Author: niranjan94

app/src/main/kotlin/com/njlabs/showjava/MainApplication.kt

@@ -72,22 +72,13 @@ class MainApplication : MultiDexApplication() {
                 AppCompatDelegate.MODE_NIGHT_NO
         )
 
+        if (preferences.customFont) {
+            initCustomFont()
+        }
+
         Ads(this).init()
         Fabric.with(this, Crashlytics())
 
-        ViewPump.init(
-            ViewPump.builder()
-                .addInterceptor(
-                    CalligraphyInterceptor(
-                        CalligraphyConfig.Builder()
-                            .setDefaultFontPath("fonts/lato-light.ttf")
-                            .setFontAttrId(R.attr.fontPath)
-                            .build()
-                    )
-                )
-                .build()
-        )
-
         if (BuildConfig.DEBUG) {
             Timber.plant(Timber.DebugTree())
         } else {
@@ -128,4 +119,21 @@ class MainApplication : MultiDexApplication() {
         super.onTerminate()
         disposables.clear()
     }
+
+    companion object {
+        fun initCustomFont() {
+            ViewPump.init(
+                ViewPump.builder()
+                    .addInterceptor(
+                        CalligraphyInterceptor(
+                            CalligraphyConfig.Builder()
+                                .setDefaultFontPath("fonts/lato-light.ttf")
+                                .setFontAttrId(R.attr.fontPath)
+                                .build()
+                        )
+                    )
+                    .build()
+            )
+        }
+    }
 }

app/src/main/kotlin/com/njlabs/showjava/activities/settings/SettingsActivity.kt

@@ -29,10 +29,12 @@ import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatDelegate
 import androidx.preference.Preference
 import androidx.preference.PreferenceFragmentCompat
+import com.njlabs.showjava.MainApplication
 import com.njlabs.showjava.R
 import com.njlabs.showjava.activities.BaseActivity
 import com.njlabs.showjava.utils.Ads
 import com.njlabs.showjava.utils.UserPreferences
+import io.github.inflationx.viewpump.ViewPump
 import io.reactivex.android.schedulers.AndroidSchedulers
 import io.reactivex.disposables.Disposable
 import io.reactivex.schedulers.Schedulers
@@ -99,6 +101,21 @@ class SettingsActivity : BaseActivity() {
                 true
             }
 
+            findPreference("customFont").setOnPreferenceChangeListener { _, newValue ->
+                if (newValue as Boolean) {
+                    MainApplication.initCustomFont()
+                } else {
+                    ViewPump.init(ViewPump.builder().build())
+                }
+                Toast.makeText(context, R.string.themeChangeCloseInfo, Toast.LENGTH_SHORT).show()
+
+                activity.let {
+                    it.startActivity(Intent(it, SettingsActivity::class.java))
+                    it.finish()
+                }
+                true
+            }
+
             findPreference("darkMode").setOnPreferenceChangeListener { _, newValue ->
                 AppCompatDelegate.setDefaultNightMode(
                     if (newValue as Boolean)

app/src/main/kotlin/com/njlabs/showjava/utils/UserPreferences.kt

@@ -32,6 +32,7 @@ class UserPreferences(private val prefs: SharedPreferences) {
 
     interface DEFAULTS {
         companion object {
+            const val CUSTOM_FONT = true
             const val DARK_MODE = false
             const val SHOW_MEMORY_USAGE = true
             const val SHOW_SYSTEM_APPS = false
@@ -45,6 +46,9 @@ class UserPreferences(private val prefs: SharedPreferences) {
     val ignoreLibraries: Boolean
         get() = prefs.getBoolean("ignoreLibraries", DEFAULTS.IGNORE_LIBRARIES)
 
+    val customFont: Boolean
+        get() = prefs.getBoolean("customFont", DEFAULTS.CUSTOM_FONT)
+
     val darkMode: Boolean
         get() = prefs.getBoolean("darkMode", DEFAULTS.DARK_MODE)
 

app/src/main/res/values/strings.xml

@@ -161,4 +161,7 @@
     <string name="adPreferences">Ads Preferences</string>
     <string name="adPreferencesSummary">Change your personalization preferences for Ads</string>
     <string name="initializing">Initializing</string>
+    <string name="useCustomFont">Use custom font</string>
+    <string name="useCustomFontSummary">Choose between lato or system default font</string>
+    <string name="userInterface">User interface</string>
 </resources>

app/src/main/res/values/styles.xml

@@ -24,6 +24,7 @@
         <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
         <item name="colorAccent">@color/colorAccent</item>
         <item name="android:windowAnimationStyle">@style/WindowAnimationTransition</item>
+        <item name="android:fontFamily">sans-serif-light</item>
     </style>
 
     <style name="AppTheme.NoActionBar">

app/src/main/res/xml/preferences.xml

@@ -35,7 +35,14 @@
 
     <PreferenceCategory
         app:iconSpaceReserved="false"
-        android:title="@string/easeOfUse">
+        android:title="@string/userInterface">
+
+        <SwitchPreference
+            app:iconSpaceReserved="false"
+            android:key="customFont"
+            android:defaultValue="true"
+            android:summary="@string/useCustomFontSummary"
+            android:title="@string/useCustomFont" />
 
         <SwitchPreference
             app:iconSpaceReserved="false"