packages_apps_Settings/src/com/android/settings/media/MediaDeviceUpdateWorker.java

/*
 * 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 static android.media.AudioManager.STREAM_DEVICES_CHANGED_ACTION;

import static com.android.settings.media.MediaOutputSlice.MEDIA_PACKAGE_NAME;

import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.media.AudioManager;
import android.net.Uri;
import android.text.TextUtils;

import androidx.annotation.VisibleForTesting;

import com.android.settings.slices.SliceBackgroundWorker;
import com.android.settingslib.media.LocalMediaManager;
import com.android.settingslib.media.MediaDevice;
import com.android.settingslib.utils.ThreadUtils;

import java.util.ArrayList;
import java.util.List;

/**
 * SliceBackgroundWorker for get MediaDevice list and handle MediaDevice state change event.
 */
public class MediaDeviceUpdateWorker extends SliceBackgroundWorker
        implements LocalMediaManager.DeviceCallback {

    private final Context mContext;
    private final List<MediaDevice> mMediaDevices = new ArrayList<>();
    private final DevicesChangedBroadcastReceiver mReceiver;
    private final String mPackageName;

    @VisibleForTesting
    LocalMediaManager mLocalMediaManager;

    public MediaDeviceUpdateWorker(Context context, Uri uri) {
        super(context, uri);
        mContext = context;
        mPackageName = uri.getQueryParameter(MEDIA_PACKAGE_NAME);
        mReceiver = new DevicesChangedBroadcastReceiver();
    }

    @Override
    protected void onSlicePinned() {
        mMediaDevices.clear();
        if (mLocalMediaManager == null) {
            mLocalMediaManager = new LocalMediaManager(mContext, mPackageName, null);
        }

        mLocalMediaManager.registerCallback(this);
        final IntentFilter intentFilter = new IntentFilter(STREAM_DEVICES_CHANGED_ACTION);
        mContext.registerReceiver(mReceiver, intentFilter);
        mLocalMediaManager.startScan();
    }

    @Override
    protected void onSliceUnpinned() {
        mLocalMediaManager.unregisterCallback(this);
        mContext.unregisterReceiver(mReceiver);
        mLocalMediaManager.stopScan();
    }

    @Override
    public void close() {
        mLocalMediaManager = null;
    }

    @Override
    public void onDeviceListUpdate(List<MediaDevice> devices) {
        buildMediaDevices(devices);
        notifySliceChange();
    }

    private void buildMediaDevices(List<MediaDevice> devices) {
        mMediaDevices.clear();
        mMediaDevices.addAll(devices);
    }

    @Override
    public void onSelectedDeviceStateChanged(MediaDevice device, int state) {
        notifySliceChange();
    }

    public List<MediaDevice> getMediaDevices() {
        return new ArrayList<>(mMediaDevices);
    }

    public void connectDevice(MediaDevice device) {
        ThreadUtils.postOnBackgroundThread(() -> {
            mLocalMediaManager.connectDevice(device);
        });
    }

    public MediaDevice getMediaDeviceById(String id) {
        return mLocalMediaManager.getMediaDeviceById(mMediaDevices, id);
    }

    public MediaDevice getCurrentConnectedMediaDevice() {
        return mLocalMediaManager.getCurrentConnectedDevice();
    }

    private class DevicesChangedBroadcastReceiver extends BroadcastReceiver {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (TextUtils.equals(AudioManager.STREAM_DEVICES_CHANGED_ACTION, action)) {
                notifySliceChange();
            }
        }
    }
}