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.Manifest; 20 import android.content.ComponentName; 21 import android.content.Context; 22 import android.content.Intent; 23 import android.content.ServiceConnection; 24 import android.content.pm.PackageManager; 25 import android.net.Uri; 26 import android.net.wifi.p2p.WifiP2pDevice; 27 import android.os.Bundle; 28 import android.os.IBinder; 29 import android.preference.Preference; 30 import android.preference.PreferenceCategory; 31 import android.preference.PreferenceFragment; 32 import android.util.Log; 33 34 import com.android.bips.BuiltInPrintService; 35 import com.android.bips.R; 36 import com.android.bips.discovery.DiscoveredPrinter; 37 import com.android.bips.discovery.P2pDiscovery; 38 import com.android.bips.p2p.P2pMonitor; 39 import com.android.bips.p2p.P2pPeerListener; 40 41 /** 42 * Present a list of previously-saved printers, and allow them to be removed 43 */ 44 public class FindP2pPrintersFragment extends PreferenceFragment implements ServiceConnection, 45 AddPrintersActivity.OnPermissionChangeListener { 46 private static final String TAG = FindP2pPrintersFragment.class.getSimpleName(); 47 private static final boolean DEBUG = false; 48 49 private static final String KEY_AVAILABLE = "available"; 50 private static final int REQUEST_PERMISSION = 1; 51 52 private BuiltInPrintService mPrintService; 53 private P2pListener mPeerDiscoveryListener; 54 private PreferenceCategory mAvailableCategory; 55 56 @Override 57 public void onCreate(Bundle savedInstanceState) { 58 super.onCreate(savedInstanceState); 59 addPreferencesFromResource(R.xml.find_p2p_prefs); 60 mAvailableCategory = (PreferenceCategory) getPreferenceScreen() 61 .findPreference(KEY_AVAILABLE); 62 } 63 64 @Override 65 public void onStart() { 66 super.onStart(); 67 if (DEBUG) Log.d(TAG, "onStart"); 68 getActivity().setTitle(R.string.wifi_direct_printers); 69 getContext().bindService(new Intent(getContext(), BuiltInPrintService.class), this, 70 Context.BIND_AUTO_CREATE); 71 } 72 73 @Override 74 public void onStop() { 75 super.onStop(); 76 if (DEBUG) Log.d(TAG, "onStop"); 77 if (mPeerDiscoveryListener != null) { 78 mPrintService.getP2pMonitor().stopDiscover(mPeerDiscoveryListener); 79 mPeerDiscoveryListener = null; 80 } 81 getContext().unbindService(this); 82 mPrintService = null; 83 } 84 85 @Override 86 public void onServiceConnected(ComponentName componentName, IBinder iBinder) { 87 if (DEBUG) Log.d(TAG, "onServiceConnected"); 88 mPrintService = BuiltInPrintService.getInstance(); 89 if (mPrintService == null) { 90 return; 91 } 92 93 // If we do not yet have permissions, ask. 94 if (getContext().checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) 95 != PackageManager.PERMISSION_GRANTED) { 96 getActivity().requestPermissions( 97 new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 98 REQUEST_PERMISSION); 99 } else { 100 startP2pDiscovery(); 101 } 102 } 103 104 private void startP2pDiscovery() { 105 if (mPrintService != null && mPeerDiscoveryListener == null) { 106 mPeerDiscoveryListener = new P2pListener(); 107 mPrintService.getP2pMonitor().discover(mPeerDiscoveryListener); 108 } 109 } 110 111 @Override 112 public void onPermissionChange() { 113 // P2P discovery requires dangerous ACCESS_COARSE_LOCATION 114 if (getContext().checkSelfPermission(Manifest.permission.ACCESS_COARSE_LOCATION) 115 == PackageManager.PERMISSION_GRANTED) { 116 startP2pDiscovery(); 117 } else { 118 // Wind back out of this fragment 119 getActivity().onBackPressed(); 120 } 121 } 122 123 @Override 124 public void onServiceDisconnected(ComponentName componentName) { 125 mPrintService = null; 126 } 127 128 /** Handle discovered P2P printers */ 129 private class P2pListener implements P2pPeerListener { 130 @Override 131 public void onPeerFound(WifiP2pDevice peer) { 132 if (DEBUG) Log.d(TAG, "onPeerFound: " + P2pMonitor.toString(peer)); 133 if (mPrintService == null) { 134 return; 135 } 136 137 DiscoveredPrinter printer = P2pDiscovery.toPrinter(peer); 138 139 // Ignore printers we have already added 140 for (DiscoveredPrinter prior : mPrintService.getP2pDiscovery().getSavedPrinters()) { 141 if (prior.path.equals(printer.path)) { 142 return; 143 } 144 } 145 146 // Install a preference so the user can add this printer 147 PrinterPreference pref = getPrinterPreference(printer.getUri()); 148 if (pref != null) { 149 pref.updatePrinter(printer); 150 } else { 151 pref = new PrinterPreference(getContext(), mPrintService, printer, true); 152 pref.setOnPreferenceClickListener(preference -> { 153 if (DEBUG) Log.d(TAG, "add " + P2pDiscovery.toPrinter(peer)); 154 new AddP2pPrinterDialog(FindP2pPrintersFragment.this, mPrintService, peer) 155 .show(); 156 return true; 157 }); 158 mAvailableCategory.addPreference(pref); 159 } 160 } 161 162 @Override 163 public void onPeerLost(WifiP2pDevice peer) { 164 if (DEBUG) Log.d(TAG, "onPeerLost: " + P2pMonitor.toString(peer)); 165 if (mPrintService == null) { 166 return; 167 } 168 169 DiscoveredPrinter printer = P2pDiscovery.toPrinter(peer); 170 171 // Remove this preference because the printer is no longer available 172 PrinterPreference pref = getPrinterPreference(printer.path); 173 if (pref != null) { 174 mAvailableCategory.removePreference(pref); 175 } 176 } 177 178 private PrinterPreference getPrinterPreference(Uri printerPath) { 179 for (int i = 0; i < mAvailableCategory.getPreferenceCount(); i++) { 180 Preference pref = mAvailableCategory.getPreference(i); 181 if (pref instanceof PrinterPreference 182 && ((PrinterPreference) pref).getPrinter().path.equals(printerPath)) { 183 return (PrinterPreference) pref; 184 } 185 } 186 return null; 187 } 188 } 189 } 190
