feat(android): refine notification permissions and UI layout

Add explicit `POST_NOTIFICATIONS` permission checks in `SettingsFragment` and `PlayerFragment` before triggering notifications or showing related preferences.

Update the permission launcher in `MainActivity` to provide a "Settings" action that links to the system application details when the notification permission is permanently denied.

Improve UI and system integration by:
* Adjusting `Snackbar` positioning with bottom margins in `MainActivity` and `PlayerFragment`.
* Updating `NotificationSys` to use a new channel ID with `IMPORTANCE_LOW`.
* Configuring `MainActivity` in `activity_main.xml` to handle orientation and screen size configuration changes manually.

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

@@ -1,25 +1,30 @@
 package com.michatec.radio
 
 import android.Manifest
-import android.os.Build
 import android.content.Context
+import android.content.Intent
 import android.content.SharedPreferences
 import android.content.pm.PackageManager
 import android.content.res.Configuration
+import android.net.Uri
+import android.os.Build
 import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
+import android.provider.Settings
 import android.view.View
+import android.widget.FrameLayout
 import androidx.activity.enableEdgeToEdge
+import androidx.activity.result.contract.ActivityResultContracts
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.widget.Toolbar
+import androidx.core.app.ActivityCompat
 import androidx.core.view.isVisible
 import androidx.navigation.fragment.NavHostFragment
-import androidx.activity.result.contract.ActivityResultContracts
-import com.google.android.material.snackbar.Snackbar
 import androidx.navigation.ui.AppBarConfiguration
 import androidx.navigation.ui.NavigationUI
 import androidx.navigation.ui.navigateUp
+import com.google.android.material.snackbar.Snackbar
 import com.michatec.radio.helpers.AppThemeHelper
 import com.michatec.radio.helpers.FileHelper
 import com.michatec.radio.helpers.LanguageHelper
@@ -45,11 +50,24 @@ class MainActivity : AppCompatActivity() {
         ActivityResultContracts.RequestPermission()
     ) { isGranted ->
         if (!isGranted) {
-            Snackbar.make(
+            val snackbar = Snackbar.make(
                 findViewById(android.R.id.content),
-                R.string.snackbar_failed_permission_notification, 
+                R.string.snackbar_failed_permission_notification,
                 Snackbar.LENGTH_LONG
-            ).show()
+            )
+            val params = snackbar.view.layoutParams as FrameLayout.LayoutParams
+            params.bottomMargin = 300
+            // If the user permanently denied the permission, show a link to settings
+            if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.POST_NOTIFICATIONS)) {
+                snackbar.setAction(R.string.fragment_settings_title) {
+                    val intent = Intent(Settings.ACTION_APPLICATION_DETAILS_SETTINGS).apply {
+                        data = Uri.fromParts("package", packageName, null)
+                    }
+                    startActivity(intent)
+                }
+            }
+            snackbar.view.layoutParams = params
+            snackbar.show()
         }
     }
 

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

@@ -6,21 +6,20 @@ import android.app.NotificationManager
 import android.app.PendingIntent
 import android.content.Context
 import android.content.Intent
-import com.michatec.radio.R
 
 object NotificationSys {
-    private const val CHANNEL_ID = "com.michatec.radio.channel"
+    private const val CHANNEL_ID = "com.michatec.radio.channel_messages"
     private const val CHANNEL_NAME = "Notifications"
-    private const val NOTIFICATION_ID = 1001
+    private const val NOTIFICATION_ID = 5000
 
     fun createNotificationChannel(context: Context) {
         val notificationManager = context.getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
 
         if (notificationManager.getNotificationChannel(CHANNEL_ID) == null) {
             val channel = NotificationChannel(
-                CHANNEL_ID, 
+                CHANNEL_ID,
-                CHANNEL_NAME, 
+                CHANNEL_NAME,
-                NotificationManager.IMPORTANCE_DEFAULT
+                NotificationManager.IMPORTANCE_LOW
             ).apply {
                 description = context.getString(R.string.notification_channel_description)
             }
@@ -37,9 +36,9 @@ object NotificationSys {
         }
 
         val pendingIntent = PendingIntent.getActivity(
-            context, 
+            context,
-            0, 
+            0,
-            targetIntent, 
+            targetIntent,
             PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
         )
 
@@ -54,10 +53,4 @@ object NotificationSys {
 
         notificationManager.notify(NOTIFICATION_ID, notification)
     }
-
-    fun showNotification(context: Context, titleResId: Int, contentResId: Int, intent: Intent? = null) {
-        val title = context.getString(titleResId)
-        val content = context.getString(contentResId)
-        showNotification(context, title, content, intent)
-    }
 }

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

@@ -1,5 +1,6 @@
 package com.michatec.radio
 
+import android.Manifest
 import android.app.Activity
 import android.content.ComponentName
 import android.content.Context
@@ -13,6 +14,7 @@ import android.util.Log
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
+import android.widget.FrameLayout
 import android.widget.Toast
 import androidx.activity.OnBackPressedCallback
 import androidx.activity.result.ActivityResultLauncher
@@ -60,7 +62,6 @@ import com.michatec.radio.extensions.*
 import com.michatec.radio.helpers.*
 import com.michatec.radio.ui.LayoutHolder
 import com.michatec.radio.ui.PlayerState
-import com.michatec.radio.BuildConfig
 import kotlinx.coroutines.*
 import kotlinx.coroutines.Dispatchers.IO
 import kotlinx.coroutines.Dispatchers.Main
@@ -101,6 +102,10 @@ class PlayerFragment : Fragment(),
         context?.packageManager?.hasSystemFeature(PackageManager.FEATURE_LEANBACK) == true
     }
 
+    private fun isPermissionGranted(context: Context, permission: String): Boolean {
+        return context.checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED
+    }
+
 
     /* Overrides onCreate from Fragment */
     override fun onCreate(savedInstanceState: Bundle?) {
@@ -840,7 +845,7 @@ class PlayerFragment : Fragment(),
             if (latestVersion != current && !BuildConfig.IS_DEBUG_ENABLED) {
                 // We have an update available, tell our user about it
                 view?.let {
-                    Snackbar.make(it, getString(R.string.app_name) + " " + latestVersion + " " + getString(R.string.snackbar_update_available), 10000)
+                    val snackbar = Snackbar.make(it, getString(R.string.app_name) + " " + latestVersion + " " + getString(R.string.snackbar_update_available), 10000)
                         .setAction(R.string.snackbar_show) {
                             val releaseurl = getString(R.string.snackbar_url_app_home_page)
                             val i = Intent(Intent.ACTION_VIEW)
@@ -853,17 +858,19 @@ class PlayerFragment : Fragment(),
                             ContextCompat.getColor(
                                 requireActivity(),
                                 R.color.default_neutral_white))
-                        .show()
-                }
 
-                if (!isAndroidTV) {
+                    if (!isAndroidTV) {
+                        val params = snackbar.view.layoutParams as FrameLayout.LayoutParams
+                        params.bottomMargin = 300
+                        snackbar.view.layoutParams = params
+                    }
+                    snackbar.show()
+                }
+                if (!isAndroidTV && isPermissionGranted(requireContext(), Manifest.permission.POST_NOTIFICATIONS)) {
                     val releaseUrl = getString(R.string.snackbar_url_app_home_page)
-    
+                    val updateIntent = Intent(Intent.ACTION_VIEW, releaseUrl.toUri()).apply {
-                    // Create the clean browser intent that will trigger ONLY when the notification is tapped
-                    val updateIntent = Intent(Intent.ACTION_VIEW, Uri.parse(releaseUrl)).apply {
                         putExtra("SOURCE", "SELF")
                     }
-
                     NotificationSys.showNotification(
                         requireContext(),
                         "${getString(R.string.app_name)} $latestVersion",

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

@@ -22,7 +22,6 @@ import com.michatec.radio.dialogs.PresetSelectionDialog
 import com.michatec.radio.dialogs.ThemeSelectionDialog
 import com.michatec.radio.dialogs.YesNoDialog
 import com.michatec.radio.helpers.*
-import com.michatec.radio.NotificationSys
 import android.content.pm.PackageManager
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers.IO
@@ -45,6 +44,10 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         context?.packageManager?.hasSystemFeature(PackageManager.FEATURE_LEANBACK) == true
     }
 
+    private fun isPermissionGranted(context: Context, permission: String): Boolean {
+        return context.checkSelfPermission(permission) == PackageManager.PERMISSION_GRANTED
+    }
+
     /* Overrides onViewCreated from PreferenceFragmentCompat */
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
@@ -386,7 +389,7 @@ class SettingsFragment : PreferenceFragmentCompat(), YesNoDialog.YesNoDialogList
         preferenceCategoryGeneral.addPreference(preferenceThemeSelection)
         preferenceCategoryGeneral.addPreference(preferenceLanguageSelection)
 
-        if (!isAndroidTV) {
+        if (!isAndroidTV && isPermissionGranted(activity as Context, android.Manifest.permission.POST_NOTIFICATIONS)) {
             preferenceCategoryGeneral.addPreference(preferenceTestNotification)
         }
 

app/src/main/res/layout/activity_main.xml

@@ -5,6 +5,7 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:background="?android:attr/colorBackground"
+    android:configChanges="orientation|screenSize|screenLayout|smallestScreenSize"
     android:fitsSystemWindows="true"
     tools:context=".MainActivity">