Bugfix/issue 1802 Unregister apps when audio output becomes unavailable

android/hello_sdl_android/build.gradle

@@ -8,6 +8,8 @@ android {
         targetSdkVersion 31
         versionCode 1
         versionName "1.0"
+        buildConfigField 'String', 'APP_TYPE', '"DEFAULT"'
+        buildConfigField 'String', 'REQUIRE_AUDIO_OUTPUT', '"FALSE"'
         testInstrumentationRunner 'androidx.test.runner.AndroidJUnitRunner'
     }
     buildTypes {
@@ -42,6 +44,13 @@ android {
             buildConfigField 'String', 'TRANSPORT', '"TCP"'
             buildConfigField 'String', 'SECURITY', '"OFF"'
         }
+        requiresAudioOutput {
+            buildConfigField 'String', 'TRANSPORT', '"MULTI"'
+            buildConfigField 'String', 'SECURITY', '"OFF"'
+            buildConfigField 'String', 'APP_TYPE', '"MEDIA"'
+            buildConfigField 'String', 'REQUIRE_AUDIO_OUTPUT', '"TRUE"'
+
+        }
     }
     lintOptions {
         disable 'GoogleAppIndexingWarning'

android/hello_sdl_android/src/main/java/com/sdl/hellosdlandroid/SdlService.java

@@ -162,6 +162,9 @@ private void startProxy() {
                     securityLevel = MultiplexTransportConfig.FLAG_MULTI_SECURITY_OFF;
                 }
                 transport = new MultiplexTransportConfig(this, APP_ID, securityLevel);
+                if (BuildConfig.REQUIRE_AUDIO_OUTPUT.equals("TRUE") ) {
+                    ((MultiplexTransportConfig)transport).setRequiresAudioSupport(true);
+                }
             } else if (BuildConfig.TRANSPORT.equals("TCP")) {
                 transport = new TCPTransportConfig(TCP_PORT, DEV_MACHINE_IP_ADDRESS, true);
             } else if (BuildConfig.TRANSPORT.equals("MULTI_HB")) {
@@ -172,7 +175,8 @@ private void startProxy() {
 
             // The app type to be used
             Vector<AppHMIType> appType = new Vector<>();
-            appType.add(AppHMIType.DEFAULT);
+            appType.add(AppHMIType.valueForString(BuildConfig.APP_TYPE));
+
 
             // The manager listener helps you know when certain events that pertain to the SDL Manager happen
             // Here we will listen for ON_HMI_STATUS and ON_COMMAND notifications

android/sdl_android/src/main/java/com/smartdevicelink/managers/lifecycle/LifecycleManager.java

@@ -55,6 +55,7 @@
 import com.smartdevicelink.transport.utl.TransportRecord;
 import com.smartdevicelink.util.AndroidTools;
 import com.smartdevicelink.util.DebugTool;
+import com.smartdevicelink.util.MediaStreamingStatus;
 
 import java.lang.ref.WeakReference;
 import java.util.List;
@@ -80,7 +81,17 @@ void initialize() {
 
         synchronized (SESSION_LOCK) {
             if (_transportConfig != null && _transportConfig.getTransportType().equals(TransportType.MULTIPLEX)) {
-                this.session = new SdlSession(sdlSessionListener, (MultiplexTransportConfig) _transportConfig);
+                MultiplexTransportConfig multiplexTransportConfig = (MultiplexTransportConfig) _transportConfig;
+                this.session = new SdlSession(sdlSessionListener, multiplexTransportConfig);
+                if (multiplexTransportConfig.requiresAudioSupport()) {
+                    this.session.setMediaStreamingStatusCallback(new MediaStreamingStatus.Callback() {
+                        @Override
+                        public void onAudioNoLongerAvailable() {
+                            clean(true);
+                            onClose("Audio output no longer available", null, SdlDisconnectedReason.DEFAULT);
+                        }
+                    });
+                }
             } else if (_transportConfig != null && _transportConfig.getTransportType().equals(TransportType.TCP)) {
                 this.session = new SdlSession(sdlSessionListener, (TCPTransportConfig) _transportConfig);
             } else {

android/sdl_android/src/main/java/com/smartdevicelink/session/SdlSession.java

@@ -62,6 +62,7 @@ public class SdlSession extends BaseSdlSession {
     WeakReference<Context> contextWeakReference;
     MediaStreamingStatus mediaStreamingStatus;
     boolean requiresAudioSupport = false;
+    MediaStreamingStatus.Callback mediaStreamingStatusCallback;
 
     public SdlSession(ISdlSessionListener listener, MultiplexTransportConfig config) {
         super(listener, config);
@@ -79,6 +80,17 @@ public SdlSession(ISdlSessionListener listener, TCPTransportConfig config) {
         this.sessionListener = listener;
     }
 
+    /**
+     * Sets a callback that is triggered when there are no audio output methods available. If this
+     * is set then the caller of this method will be responsible for shutting the session down.
+     *
+     * @param mediaStreamingStatusCallback the callback that will be triggered when audio output is
+     *                                     no longer available.
+     */
+    public void setMediaStreamingStatusCallback(MediaStreamingStatus.Callback mediaStreamingStatusCallback) {
+        this.mediaStreamingStatusCallback = mediaStreamingStatusCallback;
+    }
+
     protected SdlProtocolBase getSdlProtocolImplementation() {
         if (transportConfig instanceof MultiplexTransportConfig) {
             return new SdlProtocol(this, (MultiplexTransportConfig) transportConfig);
@@ -94,8 +106,12 @@ boolean isAudioRequirementMet() {
             mediaStreamingStatus = new MediaStreamingStatus(contextWeakReference.get(), new MediaStreamingStatus.Callback() {
                 @Override
                 public void onAudioNoLongerAvailable() {
-                    close();
-                    shutdown("Audio output no longer available");
+                    if (mediaStreamingStatusCallback != null) {
+                        mediaStreamingStatusCallback.onAudioNoLongerAvailable();
+                    } else {
+                        close();
+                        shutdown("Audio output no longer available");
+                    }
                 }
             });
         }