GeckoView: media session control

*probably fixes #132
*media keys play/pause handling

Author: truefedex

app/src/main/java/com/phlox/tvwebbrowser/activity/main/MainActivity.kt

@@ -866,9 +866,7 @@ open class MainActivity : AppCompatActivity(), ActionBar.Callback {
             return true
         } else if ((keyCode == KeyEvent.KEYCODE_MEDIA_PLAY ||
             keyCode == KeyEvent.KEYCODE_MEDIA_PAUSE ||
-            keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE) && !config.isWebEngineGecko()) {
-            //trick to make play/pause media buttons work
-            //TODO: remove this if someday webview starts handling media keys by himself
+            keyCode == KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE)) {
             if (event.action == KeyEvent.ACTION_UP) {
                 uiHandler.post {
                     tabsModel.currentTab.value?.webEngine?.togglePlayback()

app/src/main/java/com/phlox/tvwebbrowser/webengine/gecko/GeckoWebEngine.kt

@@ -112,6 +112,7 @@ class GeckoWebEngine(val tab: WebTabState): WebEngine {
     val permissionDelegate = MyPermissionDelegate(this)
     val historyDelegate = MyHistoryDelegate(this)
     val contentBlockingDelegate = MyContentBlockingDelegate(this)
+    val mediaSessionDelegate = MyMediaSessionDelegate()
     var appWebExtensionPortDelegate: AppWebExtensionPortDelegate? = null
     private lateinit var webExtObserver: (WebExtension?) -> Unit
 
@@ -137,6 +138,7 @@ class GeckoWebEngine(val tab: WebTabState): WebEngine {
         session.permissionDelegate = permissionDelegate
         session.historyDelegate = historyDelegate
         session.contentBlockingDelegate = contentBlockingDelegate
+        session.mediaSessionDelegate = mediaSessionDelegate
 
         webExtObserver = { ext: WebExtension? ->
             if (ext != null) {
@@ -307,6 +309,11 @@ class GeckoWebEngine(val tab: WebTabState): WebEngine {
 
     override fun onPause() {
         session.setFocused(false)
+        mediaSessionDelegate.mediaSession?.let {
+            if (!mediaSessionDelegate.paused) {
+                it.pause()
+            }
+        }
     }
 
     override fun onUpdateAdblockSetting(newState: Boolean) {
@@ -318,7 +325,13 @@ class GeckoWebEngine(val tab: WebTabState): WebEngine {
     }
 
     override fun togglePlayback() {
-
+        mediaSessionDelegate.mediaSession?.let {
+            if (mediaSessionDelegate.paused) {
+                it.play()
+            } else {
+                it.pause()
+            }
+        }
     }
 
     override suspend fun renderThumbnail(bitmap: Bitmap?): Bitmap? {
@@ -364,6 +377,7 @@ class GeckoWebEngine(val tab: WebTabState): WebEngine {
         }
         if (destroyTab) {
             Log.d(TAG, "Closing session completely")
+            mediaSessionDelegate.mediaSession?.stop()
             session.close()
         }
     }

app/src/main/java/com/phlox/tvwebbrowser/webengine/gecko/delegates/MyMediaSessionDelegate.kt

@@ -0,0 +1,62 @@
+package com.phlox.tvwebbrowser.webengine.gecko.delegates
+
+import org.mozilla.geckoview.GeckoSession
+import org.mozilla.geckoview.MediaSession
+
+class MyMediaSessionDelegate: MediaSession.Delegate {
+    var mediaSession: MediaSession? = null
+    var paused = false
+    override fun onActivated(session: GeckoSession, mediaSession: MediaSession) {
+        super.onActivated(session, mediaSession)
+        this.mediaSession = mediaSession
+        this.paused = false
+    }
+
+    override fun onDeactivated(session: GeckoSession, mediaSession: MediaSession) {
+        super.onDeactivated(session, mediaSession)
+        this.mediaSession = null
+    }
+
+    override fun onMetadata(
+        session: GeckoSession,
+        mediaSession: MediaSession,
+        meta: MediaSession.Metadata
+    ) {
+        super.onMetadata(session, mediaSession, meta)
+    }
+
+    override fun onFeatures(session: GeckoSession, mediaSession: MediaSession, features: Long) {
+        super.onFeatures(session, mediaSession, features)
+    }
+
+    override fun onPlay(session: GeckoSession, mediaSession: MediaSession) {
+        super.onPlay(session, mediaSession)
+        paused = false
+    }
+
+    override fun onPause(session: GeckoSession, mediaSession: MediaSession) {
+        super.onPause(session, mediaSession)
+        paused = true
+    }
+
+    override fun onStop(session: GeckoSession, mediaSession: MediaSession) {
+        super.onStop(session, mediaSession)
+    }
+
+    override fun onPositionState(
+        session: GeckoSession,
+        mediaSession: MediaSession,
+        state: MediaSession.PositionState
+    ) {
+        super.onPositionState(session, mediaSession, state)
+    }
+
+    override fun onFullscreen(
+        session: GeckoSession,
+        mediaSession: MediaSession,
+        enabled: Boolean,
+        meta: MediaSession.ElementMetadata?
+    ) {
+        super.onFullscreen(session, mediaSession, enabled, meta)
+    }
+}

app/src/main/java/com/phlox/tvwebbrowser/webengine/webview/WebViewEx.kt

@@ -605,6 +605,7 @@ class WebViewEx(context: Context, val callback: Callback, val jsInterface: Andro
         }
     }
 
+    //trick to make play/pause media buttons work
     fun togglePlayback() {
         evaluateJavascript("tvBroTogglePlayback()", null)
     }