1 package com.android.server.location; 2 3 import android.content.ContentResolver; 4 import android.content.Context; 5 import android.database.ContentObserver; 6 import android.os.Handler; 7 import android.os.Looper; 8 import android.os.UserHandle; 9 import android.provider.Settings; 10 import android.util.Log; 11 12 import com.android.internal.annotations.VisibleForTesting; 13 14 import java.util.ArrayList; 15 import java.util.List; 16 17 /** 18 * Detects blacklist change and updates the blacklist. 19 */ 20 class GnssSatelliteBlacklistHelper { 21 22 private static final String TAG = "GnssBlacklistHelper"; 23 private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG); 24 private static final String BLACKLIST_DELIMITER = ","; 25 26 private final Context mContext; 27 private final GnssSatelliteBlacklistCallback mCallback; 28 29 interface GnssSatelliteBlacklistCallback { 30 void onUpdateSatelliteBlacklist(int[] constellations, int[] svids); 31 } 32 33 GnssSatelliteBlacklistHelper(Context context, Looper looper, 34 GnssSatelliteBlacklistCallback callback) { 35 mContext = context; 36 mCallback = callback; 37 ContentObserver contentObserver = new ContentObserver(new Handler(looper)) { 38 @Override 39 public void onChange(boolean selfChange) { 40 updateSatelliteBlacklist(); 41 } 42 }; 43 mContext.getContentResolver().registerContentObserver( 44 Settings.Global.getUriFor( 45 Settings.Global.GNSS_SATELLITE_BLACKLIST), 46 true, 47 contentObserver, UserHandle.USER_ALL); 48 } 49 50 void updateSatelliteBlacklist() { 51 ContentResolver resolver = mContext.getContentResolver(); 52 String blacklist = Settings.Global.getString( 53 resolver, 54 Settings.Global.GNSS_SATELLITE_BLACKLIST); 55 if (blacklist == null) { 56 blacklist = ""; 57 } 58 if (DEBUG) { 59 Log.d(TAG, String.format("Update GNSS satellite blacklist: %s", blacklist)); 60 } 61 62 List<Integer> blacklistValues; 63 try { 64 blacklistValues = parseSatelliteBlacklist(blacklist); 65 } catch (NumberFormatException e) { 66 Log.e(TAG, "Exception thrown when parsing blacklist string.", e); 67 return; 68 } 69 70 if (blacklistValues.size() % 2 != 0) { 71 Log.e(TAG, "blacklist string has odd number of values." 72 + "Aborting updateSatelliteBlacklist"); 73 return; 74 } 75 76 int length = blacklistValues.size() / 2; 77 int[] constellations = new int[length]; 78 int[] svids = new int[length]; 79 for (int i = 0; i < length; i++) { 80 constellations[i] = blacklistValues.get(i * 2); 81 svids[i] = blacklistValues.get(i * 2 + 1); 82 } 83 mCallback.onUpdateSatelliteBlacklist(constellations, svids); 84 } 85 86 @VisibleForTesting 87 static List<Integer> parseSatelliteBlacklist(String blacklist) throws NumberFormatException { 88 String[] strings = blacklist.split(BLACKLIST_DELIMITER); 89 List<Integer> parsed = new ArrayList<>(strings.length); 90 for (String string : strings) { 91 string = string.trim(); 92 if (!"".equals(string)) { 93 int value = Integer.parseInt(string); 94 if (value < 0) { 95 throw new NumberFormatException("Negative value is invalid."); 96 } 97 parsed.add(value); 98 } 99 } 100 return parsed; 101 } 102 } 103
