1 /* 2 * Copyright (C) 2017 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 17 package com.android.bips.ui; 18 19 import android.content.ComponentName; 20 import android.content.Context; 21 import android.content.Intent; 22 import android.content.ServiceConnection; 23 import android.net.Uri; 24 import android.net.wifi.p2p.WifiP2pDevice; 25 import android.os.Bundle; 26 import android.os.IBinder; 27 import android.preference.Preference; 28 import android.preference.PreferenceCategory; 29 import android.preference.PreferenceFragment; 30 import android.util.Log; 31 32 import com.android.bips.BuiltInPrintService; 33 import com.android.bips.R; 34 import com.android.bips.discovery.DiscoveredPrinter; 35 import com.android.bips.discovery.P2pDiscovery; 36 import com.android.bips.p2p.P2pMonitor; 37 import com.android.bips.p2p.P2pPeerListener; 38 39 /** 40 * Present a list of previously-saved printers, and allow them to be removed 41 */ 42 public class FindP2pPrintersFragment extends PreferenceFragment implements ServiceConnection { 43 private static final String TAG = FindP2pPrintersFragment.class.getSimpleName(); 44 private static final boolean DEBUG = false; 45 46 private static final String KEY_AVAILABLE = "available"; 47 48 private BuiltInPrintService mPrintService; 49 private P2pListener mPeerDiscoveryListener; 50 private PreferenceCategory mAvailableCategory; 51 52 @Override onCreate(Bundle savedInstanceState)53 public void onCreate(Bundle savedInstanceState) { 54 super.onCreate(savedInstanceState); 55 addPreferencesFromResource(R.xml.find_p2p_prefs); 56 mAvailableCategory = (PreferenceCategory) getPreferenceScreen() 57 .findPreference(KEY_AVAILABLE); 58 } 59 60 @Override onStart()61 public void onStart() { 62 super.onStart(); 63 if (DEBUG) Log.d(TAG, "onStart"); 64 getActivity().setTitle(R.string.wifi_direct_printers); 65 getContext().bindService(new Intent(getContext(), BuiltInPrintService.class), this, 66 Context.BIND_AUTO_CREATE); 67 } 68 69 @Override onStop()70 public void onStop() { 71 super.onStop(); 72 if (DEBUG) Log.d(TAG, "onStop"); 73 if (mPeerDiscoveryListener != null) { 74 mPrintService.getP2pMonitor().stopDiscover(mPeerDiscoveryListener); 75 mPeerDiscoveryListener = null; 76 } 77 getContext().unbindService(this); 78 mPrintService = null; 79 } 80 81 @Override onServiceConnected(ComponentName componentName, IBinder iBinder)82 public void onServiceConnected(ComponentName componentName, IBinder iBinder) { 83 if (DEBUG) Log.d(TAG, "onServiceConnected"); 84 mPrintService = BuiltInPrintService.getInstance(); 85 if (mPrintService == null) { 86 return; 87 } 88 89 if (mPeerDiscoveryListener == null) { 90 mPeerDiscoveryListener = new P2pListener(); 91 mPrintService.getP2pMonitor().discover(mPeerDiscoveryListener); 92 } 93 } 94 95 @Override onServiceDisconnected(ComponentName componentName)96 public void onServiceDisconnected(ComponentName componentName) { 97 mPrintService = null; 98 } 99 100 /** Handle discovered P2P printers */ 101 private class P2pListener implements P2pPeerListener { 102 @Override onPeerFound(WifiP2pDevice peer)103 public void onPeerFound(WifiP2pDevice peer) { 104 if (DEBUG) Log.d(TAG, "onPeerFound: " + P2pMonitor.toString(peer)); 105 if (mPrintService == null) { 106 return; 107 } 108 109 DiscoveredPrinter printer = P2pDiscovery.toPrinter(peer); 110 111 // Ignore printers we have already added 112 for (DiscoveredPrinter prior : mPrintService.getP2pDiscovery().getSavedPrinters()) { 113 if (prior.path.equals(printer.path)) { 114 return; 115 } 116 } 117 118 // Install a preference so the user can add this printer 119 PrinterPreference pref = getPrinterPreference(printer.getUri()); 120 if (pref != null) { 121 pref.updatePrinter(printer); 122 } else { 123 pref = new PrinterPreference(getContext(), mPrintService, printer, true); 124 pref.setOnPreferenceClickListener(preference -> { 125 if (DEBUG) Log.d(TAG, "add " + P2pDiscovery.toPrinter(peer)); 126 new AddP2pPrinterDialog(FindP2pPrintersFragment.this, mPrintService, peer) 127 .show(); 128 return true; 129 }); 130 mAvailableCategory.addPreference(pref); 131 } 132 } 133 134 @Override onPeerLost(WifiP2pDevice peer)135 public void onPeerLost(WifiP2pDevice peer) { 136 if (DEBUG) Log.d(TAG, "onPeerLost: " + P2pMonitor.toString(peer)); 137 if (mPrintService == null) { 138 return; 139 } 140 141 DiscoveredPrinter printer = P2pDiscovery.toPrinter(peer); 142 143 // Remove this preference because the printer is no longer available 144 PrinterPreference pref = getPrinterPreference(printer.path); 145 if (pref != null) { 146 mAvailableCategory.removePreference(pref); 147 } 148 } 149 getPrinterPreference(Uri printerPath)150 private PrinterPreference getPrinterPreference(Uri printerPath) { 151 for (int i = 0; i < mAvailableCategory.getPreferenceCount(); i++) { 152 Preference pref = mAvailableCategory.getPreference(i); 153 if (pref instanceof PrinterPreference 154 && ((PrinterPreference) pref).getPrinter().path.equals(printerPath)) { 155 return (PrinterPreference) pref; 156 } 157 } 158 return null; 159 } 160 } 161 } 162