Modify to launch output switcher from the volume screen if that is av…

…ailable. (#1640)

media/audio/src/main/java/com/google/android/horologist/audio/OutputSwitcher.kt

@@ -0,0 +1,68 @@
+/*
+ * Copyright 2021 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.google.android.horologist.audio
+
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.content.pm.ApplicationInfo
+
+/**
+ * Support for launching the system output switcher.
+ *
+ * https://developer.android.com/guide/topics/media/media-routing#output-switcher.
+ *
+ */
+public object OutputSwitcher {
+    /**
+     * Open the Output Switcher Dialog.
+     */
+    public fun Context.launchSystemMediaOutputSwitcherUi(): Boolean {
+        val outputSwitcherLaunchIntent: Intent = Intent(OUTPUT_SWITCHER_INTENT_ACTION_NAME)
+            .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+            .putExtra(EXTRA_OUTPUT_SWITCHER_PACKAGE_NAME, packageName)
+        val outputSwitcherSystemComponentName =
+            getSystemOrSystemUpdatedAppComponent(outputSwitcherLaunchIntent)
+        if (outputSwitcherSystemComponentName != null) {
+            outputSwitcherLaunchIntent.component = outputSwitcherSystemComponentName
+            startActivity(outputSwitcherLaunchIntent)
+            return true
+        }
+        return false
+    }
+
+    private fun Context.getSystemOrSystemUpdatedAppComponent(intent: Intent): ComponentName? {
+        val packageManager = packageManager
+        val resolveInfos = packageManager.queryIntentActivities(intent, 0)
+        for (resolveInfo in resolveInfos) {
+            val activityInfo = resolveInfo.activityInfo
+            if (activityInfo?.applicationInfo == null) {
+                continue
+            }
+            val appInfo = activityInfo.applicationInfo
+            val systemAndUpdatedSystemAppFlags =
+                ApplicationInfo.FLAG_SYSTEM or ApplicationInfo.FLAG_UPDATED_SYSTEM_APP
+            if (systemAndUpdatedSystemAppFlags and appInfo.flags != 0) {
+                return ComponentName(activityInfo.packageName, activityInfo.name)
+            }
+        }
+        return null
+    }
+
+    private const val EXTRA_OUTPUT_SWITCHER_PACKAGE_NAME = "com.android.settings.panel.extra.PACKAGE_NAME"
+    private const val OUTPUT_SWITCHER_INTENT_ACTION_NAME = "com.android.settings.panel.action.MEDIA_OUTPUT"
+}

media/audio/src/main/java/com/google/android/horologist/audio/SystemAudioRepository.kt

@@ -22,6 +22,7 @@ import androidx.mediarouter.media.MediaRouteSelector
 import androidx.mediarouter.media.MediaRouter
 import androidx.mediarouter.media.MediaRouter.RouteInfo
 import com.google.android.horologist.audio.BluetoothSettings.launchBluetoothSettings
+import com.google.android.horologist.audio.OutputSwitcher.launchSystemMediaOutputSwitcherUi
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.StateFlow
 
@@ -105,7 +106,9 @@ public class SystemAudioRepository(
     }
 
     override fun launchOutputSelection(closeOnConnect: Boolean) {
-        application.launchBluetoothSettings(closeOnConnect)
+        if (!application.launchSystemMediaOutputSwitcherUi()) {
+            application.launchBluetoothSettings(closeOnConnect)
+        }
     }
 
     public companion object {