src/com/android/car/settings/qc/BluetoothSwitchWorker.java

/*
 * Copyright (C) 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
 *
 *      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.car.settings.qc;

import android.bluetooth.BluetoothAdapter;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.net.Uri;

import java.io.IOException;

/**
 * Background worker for the {@link BluetoothSwitch} QCItem.
 */
public class BluetoothSwitchWorker extends SettingsQCBackgroundWorker<BluetoothSwitch> {

    private boolean mReceiverRegistered;
    private final IntentFilter mIntentFilter = new IntentFilter(
            BluetoothAdapter.ACTION_STATE_CHANGED);
    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            notifyQCItemChange();
        }
    };

    public BluetoothSwitchWorker(Context context, Uri uri) {
        super(context, uri);
    }

    @Override
    protected void onQCItemSubscribe() {
        if (!mReceiverRegistered) {
            getContext().registerReceiver(mReceiver, mIntentFilter);
            mReceiverRegistered = true;
        }
    }

    @Override
    protected void onQCItemUnsubscribe() {
        unregisterBluetoothReceiver();
    }

    @Override
    public void close() throws IOException {
        unregisterBluetoothReceiver();
    }

    private void unregisterBluetoothReceiver() {
        if (mReceiverRegistered) {
            getContext().unregisterReceiver(mReceiver);
            mReceiverRegistered = false;
        }
    }
}