DO NOT MERGE Add toast message when bluetooth connects to voice recognition.

Bug: 143531081
Test: Manual
Change-Id: I342a1e5eefc59d25a8bea1c0fe72b8669bfdbe84

packages/CarSystemUI/res/values/strings.xml

@@ -20,4 +20,6 @@
     <string name="hvac_min_text">Min</string>
     <!-- String to represent largest setting of an HVAC system [CHAR LIMIT=5]-->
     <string name="hvac_max_text">Max</string>
+    <!-- Text for voice recognition toast. [CHAR LIMIT=60] -->
+    <string name="voice_recognition_toast">Voice recognition now handled by connected Bluetooth device</string>
 </resources>

packages/CarSystemUI/src/com/android/systemui/voicerecognition/car/ConnectedDeviceVoiceRecognitionNotifier.java

@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2020 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.systemui.voicerecognition.car;
+
+import android.bluetooth.BluetoothHeadsetClient;
+import android.content.BroadcastReceiver;
+import android.content.Context;
+import android.content.Intent;
+import android.content.IntentFilter;
+import android.os.Handler;
+import android.os.UserHandle;
+import android.util.Log;
+import android.widget.Toast;
+
+import com.android.systemui.Dependency;
+import com.android.systemui.R;
+import com.android.systemui.SysUIToast;
+import com.android.systemui.SystemUI;
+
+import javax.inject.Inject;
+
+/**
+ * Controller responsible for showing toast message when voice recognition over bluetooth device
+ * getting activated.
+ */
+public class ConnectedDeviceVoiceRecognitionNotifier extends SystemUI {
+
+    private static final String TAG = "CarVoiceRecognition";
+    private static final int INVALID_VALUE = -1;
+    private static final int VOICE_RECOGNITION_STARTED = 1;
+
+    private Handler mHandler;
+
+    private final BroadcastReceiver mVoiceRecognitionReceiver = new BroadcastReceiver() {
+        @Override
+        public void onReceive(Context context, Intent intent) {
+            if (Log.isLoggable(TAG, Log.DEBUG)) {
+                Log.d(TAG, "Voice recognition received an intent!");
+            }
+            if (intent == null
+                    || intent.getAction() == null
+                    || !BluetoothHeadsetClient.ACTION_AG_EVENT.equals(intent.getAction())
+                    || !intent.hasExtra(BluetoothHeadsetClient.EXTRA_VOICE_RECOGNITION)) {
+                return;
+            }
+
+            int voiceRecognitionState = intent.getIntExtra(
+                    BluetoothHeadsetClient.EXTRA_VOICE_RECOGNITION, INVALID_VALUE);
+
+            if (voiceRecognitionState == VOICE_RECOGNITION_STARTED) {
+                mHandler.post(() -> {
+                    SysUIToast.makeText(mContext, R.string.voice_recognition_toast,
+                            Toast.LENGTH_LONG).show();
+                });
+            }
+        }
+    };
+
+    @Inject
+    public ConnectedDeviceVoiceRecognitionNotifier() {
+        super();
+        mHandler = Dependency.get(Dependency.MAIN_HANDLER);
+    }
+
+    @Override
+    public void start() {
+    }
+
+    @Override
+    protected void onBootCompleted() {
+        IntentFilter filter = new IntentFilter();
+        filter.addAction(BluetoothHeadsetClient.ACTION_AG_EVENT);
+        mContext.registerReceiverAsUser(mVoiceRecognitionReceiver, UserHandle.ALL, filter,
+                /* broadcastPermission= */ null, /* scheduler= */ null);
+    }
+}