Refactor code and clean up unused resources

- Replace `suspendCoroutine` with `suspendCancellableCoroutine` in helper classes for better cancellation support.
- Replace `bundleOf` with manual `Bundle` initialization in `MediaControllerExt` and `SettingsFragment`.
- Remove unused constants in `Keys.kt` and redundant `onTerminate` override in `Radio.kt`.
- Clean up syntax and remove semicolons in `MainActivity.kt`.

app/src/main/java/com/michatec/radio/Keys.kt

@@ -78,7 +78,6 @@ object Keys {
     // default const values
     const val DEFAULT_SIZE_OF_METADATA_HISTORY: Int = 25
     const val DEFAULT_MAX_LENGTH_OF_METADATA_ENTRY: Int = 127
-    const val DEFAULT_DOWNLOAD_OVER_MOBILE: Boolean = false
     const val ACTIVE_DOWNLOADS_EMPTY: String = "zero"
     const val DEFAULT_MAX_RECONNECTION_COUNT: Int = 30
     const val LARGE_BUFFER_SIZE_MULTIPLIER: Int = 8
@@ -149,9 +148,6 @@ object Keys {
     const val RADIO_BROWSER_API_BASE: String = "all.api.radio-browser.info"
     const val RADIO_BROWSER_API_DEFAULT: String = "de1.api.radio-browser.info"
 
-    // locations
-    const val LOCATION_DEFAULT_STATION_IMAGE: String = "android.resource://com.michatec.radio/drawable/ic_default_station_image_24dp"
-
     // sizes (in dp)
     const val SIZE_STATION_IMAGE_CARD: Int = 72
     const val SIZE_STATION_IMAGE_MAXIMUM: Int = 640

app/src/main/java/com/michatec/radio/MainActivity.kt

@@ -25,7 +25,7 @@ import androidx.navigation.ui.navigateUp
 import com.michatec.radio.helpers.AppThemeHelper
 import com.michatec.radio.helpers.FileHelper
 import com.michatec.radio.helpers.PreferencesHelper
-import org.woheller69.freeDroidWarn.FreeDroidWarn;
+import org.woheller69.freeDroidWarn.FreeDroidWarn
 
 /*
  * MainActivity class
@@ -41,7 +41,7 @@ class MainActivity : AppCompatActivity() {
         super.onCreate(savedInstanceState)
         
         // Free Android
-        FreeDroidWarn.showWarningOnUpgrade(this, BuildConfig.VERSION_CODE);
+        FreeDroidWarn.showWarningOnUpgrade(this, BuildConfig.VERSION_CODE)
 
         // set up views
         setContentView(R.layout.activity_main)

app/src/main/java/com/michatec/radio/Radio.kt

@@ -34,9 +34,4 @@ class Radio : Application() {
         AppThemeHelper.setTheme(PreferencesHelper.loadThemeSelection())
     }
 
-    /* Implements onTerminate */
-    override fun onTerminate() {
-        super.onTerminate()
-    }
-
 }

app/src/main/java/com/michatec/radio/SettingsFragment.kt

@@ -28,7 +28,6 @@ import androidx.activity.result.ActivityResult
 import androidx.activity.result.contract.ActivityResultContracts.StartActivityForResult
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.net.toUri
-import androidx.core.os.bundleOf
 import androidx.navigation.fragment.findNavController
 import androidx.preference.*
 import com.google.android.material.snackbar.Snackbar
@@ -427,9 +426,9 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
             val sourceUri: Uri? = result.data?.data
             if (sourceUri != null) {
                 // open and import OPML in player fragment
-                val bundle: Bundle = bundleOf(
+                val bundle = Bundle().apply {
-                    Keys.ARG_RESTORE_COLLECTION to "$sourceUri"
+                    putString(Keys.ARG_RESTORE_COLLECTION, "$sourceUri")
-                )
+                }
                 this.findNavController().navigate(R.id.player_destination, bundle)
             }
         }
@@ -445,7 +444,9 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
                 Snackbar.LENGTH_LONG
             ).show()
             // update collection in player screen
-            val bundle: Bundle = bundleOf(Keys.ARG_UPDATE_COLLECTION to true)
+            val bundle = Bundle().apply {
+                putBoolean(Keys.ARG_UPDATE_COLLECTION, true)
+            }
             this.findNavController().navigate(R.id.player_destination, bundle)
         } else {
             ErrorDialog().show(
@@ -466,9 +467,9 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
                 Snackbar.LENGTH_LONG
             ).show()
             // update collection in player screen
-            val bundle: Bundle = bundleOf(
+            val bundle = Bundle().apply {
-                Keys.ARG_UPDATE_IMAGES to true
+                putBoolean(Keys.ARG_UPDATE_IMAGES, true)
-            )
+            }
             this.findNavController().navigate(R.id.player_destination, bundle)
         } else {
             ErrorDialog().show(

app/src/main/java/com/michatec/radio/extensions/MediaControllerExt.kt

@@ -16,7 +16,6 @@ package com.michatec.radio.extensions
 
 import android.content.Context
 import android.os.Bundle
-import androidx.core.os.bundleOf
 import androidx.media3.session.MediaController
 import androidx.media3.session.SessionCommand
 import androidx.media3.session.SessionResult
@@ -71,8 +70,11 @@ fun MediaController.play(context: Context, station: Station) {
 
 /* Starts playback with of a stream url */
 fun MediaController.playStreamDirectly(streamUri: String) {
+    val bundle = Bundle().apply {
+        putString(Keys.KEY_STREAM_URI, streamUri)
+    }
     sendCustomCommand(
         SessionCommand(Keys.CMD_PLAY_STREAM, Bundle.EMPTY),
-        bundleOf(Pair(Keys.KEY_STREAM_URI, streamUri))
+        bundle
     )
 }

app/src/main/java/com/michatec/radio/helpers/FileHelper.kt

@@ -33,7 +33,6 @@ import kotlinx.coroutines.Dispatchers.IO
 import java.io.*
 import java.util.*
 import kotlin.coroutines.resume
-import kotlin.coroutines.suspendCoroutine
 
 
 /*
@@ -292,7 +291,7 @@ object FileHelper {
         collection: Collection,
         lastUpdate: Date
     ) {
-        return suspendCoroutine { cont ->
+        return suspendCancellableCoroutine { cont ->
             cont.resume(saveCollection(context, collection, lastUpdate))
         }
     }
@@ -311,7 +310,7 @@ object FileHelper {
         originalFileUri: Uri,
         targetFileUri: Uri
     ): Boolean {
-        return suspendCoroutine { cont ->
+        return suspendCancellableCoroutine { cont ->
             cont.resume(copyFile(context, originalFileUri, targetFileUri))
         }
     }
@@ -319,7 +318,7 @@ object FileHelper {
 
     /* Suspend function: Exports collection of stations as M3U file - local backup copy */
     suspend fun backupCollectionAsM3uSuspended(context: Context, collection: Collection) {
-        return suspendCoroutine { cont ->
+        return suspendCancellableCoroutine { cont ->
             Log.v(TAG, "Backing up collection as M3U - Thread: ${Thread.currentThread().name}")
             // create M3U string
             val m3uString: String = CollectionHelper.createM3uString(collection)
@@ -338,7 +337,7 @@ object FileHelper {
 
     /* Suspend function: Exports collection of stations as PLS file - local backup copy */
     suspend fun backupCollectionAsPlsSuspended(context: Context, collection: Collection) {
-        return suspendCoroutine { cont ->
+        return suspendCancellableCoroutine { cont ->
             Log.v(TAG, "Backing up collection as PLS - Thread: ${Thread.currentThread().name}")
             // create PLS string
             val plsString: String = CollectionHelper.createPlsString(collection)

app/src/main/java/com/michatec/radio/helpers/NetworkHelper.kt

@@ -19,13 +19,13 @@ import android.net.ConnectivityManager
 import android.net.Network
 import android.util.Log
 import com.michatec.radio.Keys
+import kotlinx.coroutines.suspendCancellableCoroutine
 import java.net.HttpURLConnection
 import java.net.InetAddress
 import java.net.URL
 import java.net.UnknownHostException
 import java.util.*
 import kotlin.coroutines.resume
-import kotlin.coroutines.suspendCoroutine
 
 
 /*
@@ -105,7 +105,7 @@ object NetworkHelper {
 
     /* Suspend function: Detects content type (mime type) from given URL string - async using coroutine */
     suspend fun detectContentTypeSuspended(urlString: String): ContentType {
-        return suspendCoroutine { cont ->
+        return suspendCancellableCoroutine { cont ->
             cont.resume(detectContentType(urlString))
         }
     }
@@ -113,7 +113,7 @@ object NetworkHelper {
 
     /* Suspend function: Gets a random radio-browser.info api address - async using coroutine */
     suspend fun getRadioBrowserServerSuspended(): String {
-        return suspendCoroutine { cont ->
+        return suspendCancellableCoroutine { cont ->
             val serverAddress: String = try {
                 // get all available radio browser servers
                 val serverAddressList: Array<InetAddress> =