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