add system option for language selection

app/src/main/java/com/deniscerri/ytdl/ui/more/settings/GeneralSettingsFragment.kt

@@ -7,6 +7,7 @@ import android.content.DialogInterface
 import android.content.Intent
 import android.content.SharedPreferences
 import android.content.pm.PackageManager
+import android.content.res.Resources
 import android.net.Uri
 import android.os.Bundle
 import android.os.PowerManager
@@ -68,12 +69,15 @@ class GeneralSettingsFragment : BaseSettingsFragment() {
         }
 
         findPreference<ListPreference>("app_language")?.apply {
-            if (value.isNullOrBlank()) {
-                value = Locale.getDefault().language
-            }
+            value = Locale.getDefault().language
             summary = Locale.getDefault().displayLanguage
+
             setOnPreferenceChangeListener { _, newValue ->
-                AppCompatDelegate.setApplicationLocales(LocaleListCompat.forLanguageTags(newValue.toString()))
+                if (newValue == "system") {
+                    AppCompatDelegate.setApplicationLocales(LocaleListCompat.forLanguageTags(null))
+                }else{
+                    AppCompatDelegate.setApplicationLocales(LocaleListCompat.forLanguageTags(newValue.toString()))
+                }
                 summary = Locale.getDefault().displayLanguage
                 true
             }

app/src/main/java/com/deniscerri/ytdl/work/DownloadWorker.kt

@@ -280,9 +280,12 @@ class DownloadWorker(
                                     }
                                 }catch (e: Exception){
                                     e.printStackTrace()
-                                    handler.postDelayed({
-                                        Toast.makeText(context, e.message, Toast.LENGTH_SHORT).show()
-                                    }, 1000)
+                                    if (e.message?.isNotBlank() == true) {
+                                        handler.postDelayed({
+                                            Toast.makeText(context, e.message, Toast.LENGTH_SHORT).show()
+                                        }, 1000)
+                                    }
+
                                 }
                             }
 
@@ -387,9 +390,6 @@ class DownloadWorker(
                         }
 
                         tempFileDir.delete()
-                        handler.postDelayed({
-                            Toast.makeText(context, it.message, Toast.LENGTH_LONG).show()
-                        }, 1000)
 
                         Log.e(TAG, context.getString(R.string.failed_download), it)
                         notificationUtil.cancelDownloadNotification(downloadItem.id.toInt())

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

@@ -127,6 +127,7 @@
 
 
     <string-array name="language_entries">
+        <item>System</item>
         <item>English</item>
         <item>العربية</item>
         <item>Azərbaycanca</item>
@@ -171,6 +172,7 @@
     </string-array>
 
     <string-array name="language_values">
+        <item>system</item>
         <item>en</item>
         <item>ar</item>
         <item>az</item>