added button to test and adjust alarm volume.

.idea/codeStyles/Project.xml

 <component name="ProjectCodeStyleConfiguration">
   <code_scheme name="Project" version="173">
-    <AndroidXmlCodeStyleSettings>
-      <option name="ARRANGEMENT_SETTINGS_MIGRATED_TO_191" value="true" />
-    </AndroidXmlCodeStyleSettings>
     <JetCodeStyleSettings>
       <option name="CODE_STYLE_DEFAULTS" value="KOTLIN_OFFICIAL" />
     </JetCodeStyleSettings>

.idea/gradle.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
+  <component name="GradleMigrationSettings" migrationVersion="1" />
   <component name="GradleSettings">
     <option name="linkedExternalProjectsSettings">
       <GradleProjectSettings>
+        <option name="testRunner" value="PLATFORM" />
         <option name="distributionType" value="DEFAULT_WRAPPED" />
         <option name="externalProjectPath" value="$PROJECT_DIR$" />
         <option name="modules">
           </set>
         </option>
         <option name="resolveModulePerSourceSet" value="false" />
-        <option name="testRunner" value="PLATFORM" />
       </GradleProjectSettings>
     </option>
   </component>

.idea/jarRepositories.xml

+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="RemoteRepositoriesConfiguration">
+    <remote-repository>
+      <option name="id" value="central" />
+      <option name="name" value="Maven Central repository" />
+      <option name="url" value="https://repo1.maven.org/maven2" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="jboss.community" />
+      <option name="name" value="JBoss Community repository" />
+      <option name="url" value="https://repository.jboss.org/nexus/content/repositories/public/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="BintrayJCenter" />
+      <option name="name" value="BintrayJCenter" />
+      <option name="url" value="https://jcenter.bintray.com/" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="maven" />
+      <option name="name" value="maven" />
+      <option name="url" value="https://jitpack.io" />
+    </remote-repository>
+    <remote-repository>
+      <option name="id" value="Google" />
+      <option name="name" value="Google" />
+      <option name="url" value="https://dl.google.com/dl/android/maven2/" />
+    </remote-repository>
+  </component>
+</project>

app/build.gradle

 }
 
 android {
-    compileSdkVersion 29
-    buildToolsVersion "29.0.2"
+    compileSdkVersion 30
+    buildToolsVersion "30.0.0"
     compileOptions {
         sourceCompatibility JavaVersion.VERSION_1_8
         targetCompatibility JavaVersion.VERSION_1_8
     defaultConfig {
         applicationId "fr.forum_thalie.tsumugi"
         minSdkVersion 16
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode 115
         versionName "1.1.5"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"

app/src/main/java/fr/forum_thalie/tsumugi/MainActivity.kt

         }
     }
 
-    override fun onRestoreInstanceState(savedInstanceState: Bundle?) {
+    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
         super.onRestoreInstanceState(savedInstanceState ?: Bundle())
         // Now that BottomNavigationBar has restored its instance state
         // and its selectedItemId, we can proceed with setting up the

app/src/main/java/fr/forum_thalie/tsumugi/alarm/RadioAlarmExtensions.kt

+package fr.forum_thalie.tsumugi.alarm
+
+import android.content.Context
+import android.content.Intent
+import fr.forum_thalie.tsumugi.Actions
+import fr.forum_thalie.tsumugi.RadioService
+
+
+fun playOnFallback(c: Context) {
+    val a = Actions.PLAY_OR_FALLBACK
+    val i = Intent(c, RadioService::class.java)
+    i.putExtra("action", a.name)
+    c.startService(i)
+}
+
+fun resume(c: Context)
+{
+
+}
+
+fun resumeStop(c: Context) {
+    val a = Actions.PLAY
+    val i = Intent(c, RadioService::class.java)
+    i.putExtra("action", a.name)
+    c.startService(i)
+}
+
+fun resumePlay(c: Context) {
+    val a = Actions.PLAY
+    val i = Intent(c, RadioService::class.java)
+    i.putExtra("action", a.name)
+    c.startService(i)
+}

app/src/main/java/fr/forum_thalie/tsumugi/preferences/AlarmFragment.kt

 
 import android.app.TimePickerDialog
 import android.content.Context
+import android.content.Intent
+import android.media.AudioManager
 import android.os.Bundle
 import android.util.Log
+import android.view.KeyEvent
+import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.content.edit
 import androidx.preference.*
 import fr.forum_thalie.tsumugi.*
 import fr.forum_thalie.tsumugi.R
 import fr.forum_thalie.tsumugi.alarm.RadioAlarm
+import fr.forum_thalie.tsumugi.playerstore.PlayerStore
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.GlobalScope.coroutineContext
+import kotlinx.coroutines.Job
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.launch
 import java.util.*
+import kotlin.coroutines.CoroutineContext
+import kotlin.math.max
+import kotlin.math.min
+
 
 class AlarmFragment : PreferenceFragmentCompat() {
 
         }
 
 
+        val testAlarmVolume: Preference? = findPreference("testAlarmVolume")
+        testAlarmVolume!!.onPreferenceClickListener = Preference.OnPreferenceClickListener {
+
+            // get previous state: if it's playing, we'll resume playing as multimedia; if it was stopped, we'll stop
+            val isPlayingMultimedia: Boolean = PlayerStore.instance.isPlaying.value ?: false
+
+            val builder1 = AlertDialog.Builder(requireContext())
+            builder1.setTitle(R.string.test_alarm_volume)
+            builder1.setMessage(R.string.popupTestAlarmVolume)
+            builder1.setCancelable(false)
+            builder1.setPositiveButton(
+                getString(R.string.finished)
+            ) { dialog, _ ->
+                // put the radio back to media sound, or off if it was off.
+                if (isPlayingMultimedia)
+                {
+                    actionOnService(Actions.PLAY)
+                } else {
+                    actionOnService(Actions.STOP)
+                }
+                dialog.cancel()
+            }
+
+            val adjustAlarmVolume: (Int) -> Unit = debounce<Int>(50, coroutineContext) {
+                val keyCode = it
+
+                val audioManager = requireContext().getSystemService(Context.AUDIO_SERVICE) as AudioManager
+                val currentVolume = audioManager.getStreamVolume(AudioManager.STREAM_ALARM)
+                val minVolume = 0 // audioManager.getStreamMinVolume(AudioManager.STREAM_ALARM) <- require API28+
+                val maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_ALARM)
+                Log.d(tag, "current, max = $currentVolume, $maxVolume")
+                if (keyCode == KeyEvent.KEYCODE_VOLUME_DOWN) {
+                    audioManager.setStreamVolume(AudioManager.STREAM_ALARM, max(currentVolume - 1, minVolume), AudioManager.FLAG_SHOW_UI)
+
+                } else if (keyCode == KeyEvent.KEYCODE_VOLUME_UP){
+                    audioManager.setStreamVolume(AudioManager.STREAM_ALARM, min(currentVolume + 1, maxVolume), AudioManager.FLAG_SHOW_UI)
+                }
+
+            }
+
+            builder1.setOnKeyListener { dialogInterface, i, event ->
+                adjustAlarmVolume(i)
+                true
+            }
+
+            val alert11 = builder1.create()
+
+            // start as alarm
+            actionOnService(Actions.PLAY_OR_FALLBACK)
+
+            alert11.show()
+
+            true
+        }
+
         alarmDays?.isEnabled = isWakingUp?.isChecked ?: false
         timeSet?.isEnabled = isWakingUp?.isChecked ?: false
         snoozeDuration?.isEnabled = isWakingUp?.isChecked ?: false
 
     }
 
+    private fun actionOnService (a: Actions) {
+        // start as alarm
+        val i = Intent(requireContext(), RadioService::class.java)
+        i.putExtra("action", a.name)
+        requireContext().startService(i)
+    }
+
+    private fun <T> debounce(delayMs: Long = 500L,
+                             coroutineContext: CoroutineContext,
+                             f: (T) -> Unit): (T) -> Unit {
+        var debounceJob: Job? = null
+        return { param: T ->
+            if (debounceJob?.isCompleted != false) {
+                debounceJob = CoroutineScope(coroutineContext).launch {
+                    delay(delayMs)
+                    f(param)
+                }
+            }
+        }
+    }
+
 
 }

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

     <string name="action_refresh">Raffraîchir les données</string>
     <string name="autoPlay">\"Play\" au branchement de la prise casque</string>
     <string name="settings">Paramètres</string>
+    <string name="test_alarm_volume">Tester et ajuster le volume de l\'alarme</string>
+    <string name="test_alarm_volume_summary">Touchez pour écouter et régler le volume</string>
+    <string name="popupTestAlarmVolume">La radio est à présent lancée en mode alarme. Ajustez le volume avec les boutons de volume de votre appareil.</string>
+    <string name="finished">Terminé</string>
 
 </resources>

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

     <string name="action_refresh">Refresh data</string>
     <string name="autoPlay">Auto play when plugging headphones</string>
     <string name="settings">Settings</string>
+    <string name="test_alarm_volume">Test and change alarm volume</string>
+    <string name="test_alarm_volume_summary">Touch this to listen to the alarm volume and set it up</string>
+    <string name="popupTestAlarmVolume">The radio stream is now started in alarm mode. Adjust the volume with the volume buttons on your device.</string>
+    <string name="finished">Done</string>
 
 </resources>

app/src/main/res/xml/alarm_preferences.xml

         android:summary="%s"
         />
 
+    <Preference
+        app:iconSpaceReserved="false"
+        android:key="testAlarmVolume"
+        android:title="@string/test_alarm_volume"
+        android:summary="@string/test_alarm_volume_summary" />
+
 </PreferenceScreen>