Sound + Output Switcher on Volume Slice

- Show "play media to" item when Previously Connected device is available
- Click "Play media to" to launch output slice
- Update test case

Bug: 127729340
Test: make -j50 RunSettingsRoboTests
Change-Id: Ic00b309f87bc16f540b22b5a43fecb86f76caeb2

src/com/android/settings/media/MediaOutputIndicatorWorker.java

@@ -0,0 +1,161 @@
+/*
+ * Copyright (C) 2019 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
+ *
+ *      http://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.android.settings.media;
+
+import android.bluetooth.BluetoothDevice;
+import android.bluetooth.BluetoothProfile;
+import android.content.Context;
+import android.net.Uri;
+import android.util.Log;
+
+import com.android.internal.util.CollectionUtils;
+import com.android.settings.R;
+import com.android.settings.bluetooth.Utils;
+import com.android.settings.slices.SliceBackgroundWorker;
+import com.android.settingslib.bluetooth.A2dpProfile;
+import com.android.settingslib.bluetooth.BluetoothCallback;
+import com.android.settingslib.bluetooth.CachedBluetoothDevice;
+import com.android.settingslib.bluetooth.HearingAidProfile;
+import com.android.settingslib.bluetooth.LocalBluetoothManager;
+import com.android.settingslib.bluetooth.LocalBluetoothProfileManager;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Listener for background change from {@code BluetoothCallback} to update media output indicator.
+ */
+public class MediaOutputIndicatorWorker extends SliceBackgroundWorker implements BluetoothCallback {
+
+    private static final String TAG = "MediaOutputIndicatorWorker";
+
+    private LocalBluetoothManager mLocalBluetoothManager;
+    private LocalBluetoothProfileManager mProfileManager;
+
+    public MediaOutputIndicatorWorker(Context context, Uri uri) {
+        super(context, uri);
+    }
+
+    @Override
+    protected void onSlicePinned() {
+        LocalBluetoothManager mLocalBluetoothManager = Utils.getLocalBtManager(getContext());
+        if (mLocalBluetoothManager == null) {
+            Log.e(TAG, "Bluetooth is not supported on this device");
+            return;
+        }
+        mProfileManager = mLocalBluetoothManager.getProfileManager();
+        mLocalBluetoothManager.getEventManager().registerCallback(this);
+    }
+
+    @Override
+    protected void onSliceUnpinned() {
+        if (mLocalBluetoothManager == null) {
+            Log.e(TAG, "Bluetooth is not supported on this device");
+            return;
+        }
+        mLocalBluetoothManager.getEventManager().unregisterCallback(this);
+    }
+
+    @Override
+    public void close() throws IOException {
+        mLocalBluetoothManager = null;
+        mProfileManager = null;
+    }
+
+    @Override
+    public void onBluetoothStateChanged(int bluetoothState) {
+        // To handle the case that Bluetooth on and no connected devices
+        notifySliceChange();
+    }
+
+    @Override
+    public void onActiveDeviceChanged(CachedBluetoothDevice activeDevice, int bluetoothProfile) {
+        if (bluetoothProfile == BluetoothProfile.A2DP) {
+            notifySliceChange();
+        }
+    }
+
+    /**
+     * To decide Slice's visibility.
+     *
+     * @return true if device is connected or previously connected, false for other cases.
+     */
+    public boolean isVisible() {
+        return !CollectionUtils.isEmpty(getConnectableA2dpDevices())
+                || !CollectionUtils.isEmpty(getConnectableHearingAidDevices());
+    }
+
+    private List<BluetoothDevice> getConnectableA2dpDevices() {
+        // get A2dp devices on all states
+        // (STATE_DISCONNECTED, STATE_CONNECTING, STATE_CONNECTED,  STATE_DISCONNECTING)
+        final A2dpProfile a2dpProfile = mProfileManager.getA2dpProfile();
+        if (a2dpProfile == null) {
+            return new ArrayList<>();
+        }
+        return a2dpProfile.getConnectableDevices();
+    }
+
+    private List<BluetoothDevice> getConnectableHearingAidDevices() {
+        // get hearing aid profile devices on all states
+        // (STATE_DISCONNECTED, STATE_CONNECTING, STATE_CONNECTED,  STATE_DISCONNECTING)
+        final HearingAidProfile hapProfile = mProfileManager.getHearingAidProfile();
+        if (hapProfile == null) {
+            return new ArrayList<>();
+        }
+
+        return hapProfile.getConnectableDevices();
+    }
+
+    /**
+     * Get active devices name.
+     *
+     * @return active Bluetooth device alias, or default summary if no active device.
+     */
+    public CharSequence findActiveDeviceName() {
+        // Return Hearing Aid device name if it is active
+        BluetoothDevice activeDevice = findActiveHearingAidDevice();
+        if (activeDevice != null) {
+            return activeDevice.getAliasName();
+        }
+        // Return A2DP device name if it is active
+        final A2dpProfile a2dpProfile = mProfileManager.getA2dpProfile();
+        if (a2dpProfile != null) {
+            activeDevice = a2dpProfile.getActiveDevice();
+            if (activeDevice != null) {
+                return activeDevice.getAliasName();
+            }
+        }
+        // No active device, return default summary
+        return getContext().getText(R.string.media_output_default_summary);
+    }
+
+    private BluetoothDevice findActiveHearingAidDevice() {
+        final HearingAidProfile hearingAidProfile = mProfileManager.getHearingAidProfile();
+        if (hearingAidProfile == null) {
+            return null;
+        }
+
+        final List<BluetoothDevice> activeDevices = hearingAidProfile.getActiveDevices();
+        for (BluetoothDevice btDevice : activeDevices) {
+            if (btDevice != null) {
+                return btDevice;
+            }
+        }
+        return null;
+    }
+}