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      1 /*
      2  * Copyright 2018 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.android.settingslib.media;
     17 
     18 import android.app.Notification;
     19 import android.content.Context;
     20 import android.util.Log;
     21 
     22 import java.util.ArrayList;
     23 import java.util.Collection;
     24 import java.util.List;
     25 
     26 /**
     27  * MediaManager provide interface to get MediaDevice list.
     28  */
     29 public abstract class MediaManager {
     30 
     31     private static final String TAG = "MediaManager";
     32 
     33     protected final Collection<MediaDeviceCallback> mCallbacks = new ArrayList<>();
     34     protected final List<MediaDevice> mMediaDevices = new ArrayList<>();
     35 
     36     protected Context mContext;
     37     protected Notification mNotification;
     38 
     39     MediaManager(Context context, Notification notification) {
     40         mContext = context;
     41         mNotification = notification;
     42     }
     43 
     44     protected void registerCallback(MediaDeviceCallback callback) {
     45         synchronized (mCallbacks) {
     46             if (!mCallbacks.contains(callback)) {
     47                 mCallbacks.add(callback);
     48             }
     49         }
     50     }
     51 
     52     protected void unregisterCallback(MediaDeviceCallback callback) {
     53         synchronized (mCallbacks) {
     54             if (mCallbacks.contains(callback)) {
     55                 mCallbacks.remove(callback);
     56             }
     57         }
     58     }
     59 
     60     /**
     61      * Start scan connected MediaDevice
     62      */
     63     public abstract void startScan();
     64 
     65     /**
     66      * Stop scan MediaDevice
     67      */
     68     public abstract void stopScan();
     69 
     70     protected MediaDevice findMediaDevice(String id) {
     71         for (MediaDevice mediaDevice : mMediaDevices) {
     72             if (mediaDevice.getId().equals(id)) {
     73                 return mediaDevice;
     74             }
     75         }
     76         Log.e(TAG, "findMediaDevice() can't found device");
     77         return null;
     78     }
     79 
     80     protected void dispatchDeviceAdded(MediaDevice mediaDevice) {
     81         synchronized (mCallbacks) {
     82             for (MediaDeviceCallback callback : mCallbacks) {
     83                 callback.onDeviceAdded(mediaDevice);
     84             }
     85         }
     86     }
     87 
     88     protected void dispatchDeviceRemoved(MediaDevice mediaDevice) {
     89         synchronized (mCallbacks) {
     90             for (MediaDeviceCallback callback : mCallbacks) {
     91                 callback.onDeviceRemoved(mediaDevice);
     92             }
     93         }
     94     }
     95 
     96     protected void dispatchDeviceListAdded() {
     97         synchronized (mCallbacks) {
     98             for (MediaDeviceCallback callback : mCallbacks) {
     99                 callback.onDeviceListAdded(new ArrayList<>(mMediaDevices));
    100             }
    101         }
    102     }
    103 
    104     protected void dispatchDeviceListRemoved(List<MediaDevice> devices) {
    105         synchronized (mCallbacks) {
    106             for (MediaDeviceCallback callback : mCallbacks) {
    107                 callback.onDeviceListRemoved(devices);
    108             }
    109         }
    110     }
    111 
    112     protected void dispatchConnectedDeviceChanged(String id) {
    113         synchronized (mCallbacks) {
    114             for (MediaDeviceCallback callback : mCallbacks) {
    115                 callback.onConnectedDeviceChanged(id);
    116             }
    117         }
    118     }
    119 
    120     protected void dispatchDataChanged() {
    121         synchronized (mCallbacks) {
    122             for (MediaDeviceCallback callback : mCallbacks) {
    123                 callback.onDeviceAttributesChanged();
    124             }
    125         }
    126     }
    127 
    128     /**
    129      * Callback for notifying device is added, removed and attributes changed.
    130      */
    131     public interface MediaDeviceCallback {
    132         /**
    133          * Callback for notifying MediaDevice is added.
    134          *
    135          * @param device the MediaDevice
    136          */
    137         void onDeviceAdded(MediaDevice device);
    138 
    139         /**
    140          * Callback for notifying MediaDevice list is added.
    141          *
    142          * @param devices the MediaDevice list
    143          */
    144         void onDeviceListAdded(List<MediaDevice> devices);
    145 
    146         /**
    147          * Callback for notifying MediaDevice is removed.
    148          *
    149          * @param device the MediaDevice
    150          */
    151         void onDeviceRemoved(MediaDevice device);
    152 
    153         /**
    154          * Callback for notifying MediaDevice list is removed.
    155          *
    156          * @param devices the MediaDevice list
    157          */
    158         void onDeviceListRemoved(List<MediaDevice> devices);
    159 
    160         /**
    161          * Callback for notifying connected MediaDevice is changed.
    162          *
    163          * @param id the id of MediaDevice
    164          */
    165         void onConnectedDeviceChanged(String id);
    166 
    167         /**
    168          * Callback for notifying that MediaDevice attributes
    169          * (e.g: device name, connection state, subtitle) is changed.
    170          */
    171         void onDeviceAttributesChanged();
    172     }
    173 }
    174