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

    <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>

/*

 * 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);

    }

}