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      1 /*
      2  * Copyright (C) 2016 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.settings.connecteddevice;
     17 
     18 import android.content.BroadcastReceiver;
     19 import android.content.Context;
     20 import android.content.Intent;
     21 import android.content.IntentFilter;
     22 import android.hardware.usb.UsbManager;
     23 import android.support.annotation.VisibleForTesting;
     24 import android.support.v7.preference.Preference;
     25 import android.support.v7.preference.PreferenceScreen;
     26 
     27 import com.android.settings.core.PreferenceControllerMixin;
     28 import com.android.settings.R;
     29 import com.android.settings.deviceinfo.UsbBackend;
     30 import com.android.settingslib.core.AbstractPreferenceController;
     31 import com.android.settingslib.core.lifecycle.LifecycleObserver;
     32 import com.android.settingslib.core.lifecycle.events.OnPause;
     33 import com.android.settingslib.core.lifecycle.events.OnResume;
     34 
     35 public class UsbModePreferenceController extends AbstractPreferenceController
     36         implements PreferenceControllerMixin, LifecycleObserver, OnResume, OnPause {
     37 
     38     private static final String KEY_USB_MODE = "usb_mode";
     39 
     40     private UsbBackend mUsbBackend;
     41     private UsbConnectionBroadcastReceiver mUsbReceiver;
     42     private Preference mUsbPreference;
     43 
     44     public UsbModePreferenceController(Context context, UsbBackend usbBackend) {
     45         super(context);
     46         mUsbBackend = usbBackend;
     47         mUsbReceiver = new UsbConnectionBroadcastReceiver();
     48     }
     49 
     50     @Override
     51     public void displayPreference(PreferenceScreen screen) {
     52         super.displayPreference(screen);
     53         mUsbPreference = screen.findPreference(KEY_USB_MODE);
     54         updataSummary(mUsbPreference);
     55     }
     56 
     57     @Override
     58     public void updateState(Preference preference) {
     59         updataSummary(preference);
     60     }
     61 
     62     @Override
     63     public boolean isAvailable() {
     64         return true;
     65     }
     66 
     67     @Override
     68     public String getPreferenceKey() {
     69         return KEY_USB_MODE;
     70     }
     71 
     72     @Override
     73     public void onPause() {
     74         mUsbReceiver.unregister();
     75     }
     76 
     77     @Override
     78     public void onResume() {
     79         mUsbReceiver.register();
     80     }
     81 
     82     @VisibleForTesting
     83     int getSummary(int mode) {
     84         switch (mode) {
     85             case UsbBackend.MODE_POWER_SINK | UsbBackend.MODE_DATA_NONE:
     86                 return R.string.usb_summary_charging_only;
     87             case UsbBackend.MODE_POWER_SOURCE | UsbBackend.MODE_DATA_NONE:
     88                 return R.string.usb_summary_power_only;
     89             case UsbBackend.MODE_POWER_SINK | UsbBackend.MODE_DATA_MTP:
     90                 return R.string.usb_summary_file_transfers;
     91             case UsbBackend.MODE_POWER_SINK | UsbBackend.MODE_DATA_PTP:
     92                 return R.string.usb_summary_photo_transfers;
     93             case UsbBackend.MODE_POWER_SINK | UsbBackend.MODE_DATA_MIDI:
     94                 return R.string.usb_summary_MIDI;
     95         }
     96         return 0;
     97     }
     98 
     99     private void updataSummary(Preference preference) {
    100         updataSummary(preference, mUsbBackend.getCurrentMode());
    101     }
    102 
    103     private void updataSummary(Preference preference, int mode) {
    104         if (preference != null) {
    105             if (mUsbReceiver.isConnected()) {
    106                 preference.setEnabled(true);
    107                 preference.setSummary(getSummary(mode));
    108             } else {
    109                 preference.setSummary(R.string.disconnected);
    110                 preference.setEnabled(false);
    111             }
    112         }
    113     }
    114 
    115     private class UsbConnectionBroadcastReceiver extends BroadcastReceiver {
    116         private boolean mListeningToUsbEvents;
    117         private boolean mConnected;
    118 
    119         @Override
    120         public void onReceive(Context context, Intent intent) {
    121             boolean connected = intent != null
    122                     && intent.getExtras().getBoolean(UsbManager.USB_CONNECTED);
    123             if (connected != mConnected) {
    124                 mConnected = connected;
    125                 updataSummary(mUsbPreference);
    126             }
    127         }
    128 
    129         public void register() {
    130             if (!mListeningToUsbEvents) {
    131                 IntentFilter intentFilter = new IntentFilter(UsbManager.ACTION_USB_STATE);
    132                 Intent intent = mContext.registerReceiver(this, intentFilter);
    133                 mConnected = intent != null
    134                         && intent.getExtras().getBoolean(UsbManager.USB_CONNECTED);
    135                 mListeningToUsbEvents = true;
    136             }
    137         }
    138 
    139         public void unregister() {
    140             if (mListeningToUsbEvents) {
    141                 mContext.unregisterReceiver(this);
    142                 mListeningToUsbEvents = false;
    143             }
    144         }
    145 
    146         public boolean isConnected() {
    147             return mConnected;
    148         }
    149     }
    150 
    151 }
    152