1 /* 2 * Copyright (C) 2011 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.camera; 18 19 import android.content.Context; 20 import android.location.Location; 21 import android.location.LocationProvider; 22 import android.os.Bundle; 23 import android.util.Log; 24 25 /** 26 * A class that handles everything about location. 27 */ 28 public class LocationManager { 29 private static final String TAG = "LocationManager"; 30 31 private Context mContext; 32 private Listener mListener; 33 private android.location.LocationManager mLocationManager; 34 private boolean mRecordLocation; 35 36 LocationListener [] mLocationListeners = new LocationListener[] { 37 new LocationListener(android.location.LocationManager.GPS_PROVIDER), 38 new LocationListener(android.location.LocationManager.NETWORK_PROVIDER) 39 }; 40 41 public interface Listener { 42 public void showGpsOnScreenIndicator(boolean hasSignal); 43 public void hideGpsOnScreenIndicator(); 44 } 45 46 public LocationManager(Context context, Listener listener) { 47 mContext = context; 48 mListener = listener; 49 } 50 51 public Location getCurrentLocation() { 52 if (!mRecordLocation) return null; 53 54 // go in best to worst order 55 for (int i = 0; i < mLocationListeners.length; i++) { 56 Location l = mLocationListeners[i].current(); 57 if (l != null) return l; 58 } 59 Log.d(TAG, "No location received yet."); 60 return null; 61 } 62 63 public void recordLocation(boolean recordLocation) { 64 if (mRecordLocation != recordLocation) { 65 mRecordLocation = recordLocation; 66 if (recordLocation) { 67 startReceivingLocationUpdates(); 68 } else { 69 stopReceivingLocationUpdates(); 70 } 71 } 72 } 73 74 private void startReceivingLocationUpdates() { 75 if (mLocationManager == null) { 76 mLocationManager = (android.location.LocationManager) 77 mContext.getSystemService(Context.LOCATION_SERVICE); 78 } 79 if (mLocationManager != null) { 80 try { 81 mLocationManager.requestLocationUpdates( 82 android.location.LocationManager.NETWORK_PROVIDER, 83 1000, 84 0F, 85 mLocationListeners[1]); 86 } catch (SecurityException ex) { 87 Log.i(TAG, "fail to request location update, ignore", ex); 88 } catch (IllegalArgumentException ex) { 89 Log.d(TAG, "provider does not exist " + ex.getMessage()); 90 } 91 try { 92 mLocationManager.requestLocationUpdates( 93 android.location.LocationManager.GPS_PROVIDER, 94 1000, 95 0F, 96 mLocationListeners[0]); 97 if (mListener != null) mListener.showGpsOnScreenIndicator(false); 98 } catch (SecurityException ex) { 99 Log.i(TAG, "fail to request location update, ignore", ex); 100 } catch (IllegalArgumentException ex) { 101 Log.d(TAG, "provider does not exist " + ex.getMessage()); 102 } 103 Log.d(TAG, "startReceivingLocationUpdates"); 104 } 105 } 106 107 private void stopReceivingLocationUpdates() { 108 if (mLocationManager != null) { 109 for (int i = 0; i < mLocationListeners.length; i++) { 110 try { 111 mLocationManager.removeUpdates(mLocationListeners[i]); 112 } catch (Exception ex) { 113 Log.i(TAG, "fail to remove location listners, ignore", ex); 114 } 115 } 116 Log.d(TAG, "stopReceivingLocationUpdates"); 117 } 118 if (mListener != null) mListener.hideGpsOnScreenIndicator(); 119 } 120 121 private class LocationListener 122 implements android.location.LocationListener { 123 Location mLastLocation; 124 boolean mValid = false; 125 String mProvider; 126 127 public LocationListener(String provider) { 128 mProvider = provider; 129 mLastLocation = new Location(mProvider); 130 } 131 132 @Override 133 public void onLocationChanged(Location newLocation) { 134 if (newLocation.getLatitude() == 0.0 135 && newLocation.getLongitude() == 0.0) { 136 // Hack to filter out 0.0,0.0 locations 137 return; 138 } 139 // If GPS is available before start camera, we won't get status 140 // update so update GPS indicator when we receive data. 141 if (mListener != null && mRecordLocation && 142 android.location.LocationManager.GPS_PROVIDER.equals(mProvider)) { 143 mListener.showGpsOnScreenIndicator(true); 144 } 145 if (!mValid) { 146 Log.d(TAG, "Got first location."); 147 } 148 mLastLocation.set(newLocation); 149 mValid = true; 150 } 151 152 @Override 153 public void onProviderEnabled(String provider) { 154 } 155 156 @Override 157 public void onProviderDisabled(String provider) { 158 mValid = false; 159 } 160 161 @Override 162 public void onStatusChanged( 163 String provider, int status, Bundle extras) { 164 switch(status) { 165 case LocationProvider.OUT_OF_SERVICE: 166 case LocationProvider.TEMPORARILY_UNAVAILABLE: { 167 mValid = false; 168 if (mListener != null && mRecordLocation && 169 android.location.LocationManager.GPS_PROVIDER.equals(provider)) { 170 mListener.showGpsOnScreenIndicator(false); 171 } 172 break; 173 } 174 } 175 } 176 177 public Location current() { 178 return mValid ? mLastLocation : null; 179 } 180 } 181 } 182
