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