tried to solve sync issue

src/de/tudarmstadt/informatik/hostage/logging/SyncDevice.java

@@ -62,7 +62,7 @@ public class SyncDevice {
                     + " WHERE " + " D." + HostageDBContract.SyncDeviceEntry.COLUMN_NAME_DEVICE_ID + " = " + "'"+deviceUUID+"'";
             HostageDBOpenHelper dbh = new HostageDBOpenHelper(MainActivity.context);
 
-            SQLiteDatabase db = dbh.getReadableDatabase();
+            SQLiteDatabase db = dbh.getWritableDatabase();
             Cursor cursor = db.rawQuery(selectQuery, null);
 
             // IF WE ALREADY HAVE A SYNC DEVICE FOR THE GIVEN DEVICE UUID
@@ -72,8 +72,9 @@ public class SyncDevice {
                 record.setLast_sync_timestamp(cursor.getLong(1));
                 record.setHighest_attack_id(cursor.getLong(2));
                 thisDevice = record;
-
+                cursor.close();
             } else {
+                cursor.close();
             // CREATE A NEW SYNC DEVICE
                 thisDevice = new SyncDevice();
                 // ITS IMPORTANT TO CREATE A COMPLETE NEW DEVICE UUID
@@ -88,7 +89,6 @@ public class SyncDevice {
                 devices.add(thisDevice);
                 dbh.insertSyncDevices(devices);
             }
-            cursor.close();
 
             // return record list
             db.close();

src/de/tudarmstadt/informatik/hostage/persistence/HostageDBOpenHelper.java

@@ -836,7 +836,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
 		return networkInformation;
 	}
 
-    private NetworkRecord createNetworkRecord(Cursor cursor){
+    private synchronized NetworkRecord createNetworkRecord(Cursor cursor){
         NetworkRecord record = new NetworkRecord();
         record.setBssid(cursor.getString(0));
         record.setSsid(cursor.getString(1));
@@ -852,7 +852,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
 	 * @param networkInformation ArrayList of {@link NetworkRecord NetworkRecords}
 	 * @see  {@link HostageDBOpenHelper#updateNetworkInformation(NetworkRecord record)}
 	 */
-	public void updateNetworkInformation(ArrayList<NetworkRecord> networkInformation) {
+	public synchronized void updateNetworkInformation(ArrayList<NetworkRecord> networkInformation) {
         SQLiteDatabase db = this.getReadableDatabase();
 
         db.beginTransaction();
@@ -888,7 +888,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
 	 * has a newer location time stamp.
 	 * @param record The new {@link NetworkRecord}.
 	 */
-	public void updateNetworkInformation(NetworkRecord record) {
+	public synchronized void updateNetworkInformation(NetworkRecord record) {
 		SQLiteDatabase db = this.getReadableDatabase();
 		String bssid = record.getBssid();
 		String bssidQuery = "SELECT  * FROM " +  NetworkEntry.TABLE_NAME + " WHERE " +  NetworkEntry.COLUMN_NAME_BSSID + " = ?";
@@ -913,7 +913,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
 	 * @param deviceID The Device id
 	 * @param timestamp The synchronization timestamp
 	 */
-	public void updateTimestampOfSyncDevice(String deviceID, long timestamp){
+	public synchronized void updateTimestampOfSyncDevice(String deviceID, long timestamp){
 		SQLiteDatabase db = this.getReadableDatabase();		
 		ContentValues deviceValues = new ContentValues();
 		deviceValues.put(SyncDeviceEntry.COLUMN_NAME_DEVICE_ID, deviceID);
@@ -926,7 +926,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
 	 * Updates the Timestamps of synchronization devices from a HashMap.
 	 * @param devices HashMap of device ids and their synchronization timestamps.
 	 */
-	public void updateSyncDevices(HashMap<String, Long> devices){
+	public synchronized void updateSyncDevices(HashMap<String, Long> devices){
 		SQLiteDatabase db = this.getReadableDatabase();
         db.beginTransaction();
 
@@ -945,13 +945,13 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
 		db.close();
 	}
 
-    public void updateSyncDevices(ArrayList<SyncDevice> devices){
+    public synchronized void updateSyncDevices(ArrayList<SyncDevice> devices){
         SQLiteDatabase db = this.getReadableDatabase();
         this.updateSyncDevices(devices, db);
         db.close();
     }
 
-    public void updateSyncDevices(ArrayList<SyncDevice> devices, SQLiteDatabase db){
+    public synchronized void updateSyncDevices(ArrayList<SyncDevice> devices, SQLiteDatabase db){
         db.beginTransaction();
 
         try {
@@ -972,7 +972,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
      * Returns the own state containing all registered devices ids and their max sync_id
      * @return {@link de.tudarmstadt.informatik.hostage.logging.SyncInfo}
      */
-    public SyncInfo getOwnState(){
+    public synchronized SyncInfo getOwnState(){
         ArrayList<SyncDevice> devices = this.getSyncDevices();
 
         HashMap<String, Long> deviceMap = new HashMap<String, Long>();
@@ -1107,7 +1107,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
 	/**
 	 * Deletes a device with given id from the device {@link de.tudarmstadt.informatik.hostage.persistence.HostageDBContract.SyncDeviceEntry} and also all data captured by this device in  {@link SyncInfoEntry}
 	 */
-	public void clearSyncInfos(){
+	public synchronized void clearSyncInfos(){
 		SQLiteDatabase db = this.getReadableDatabase();
 		db.delete(SyncDeviceEntry.TABLE_NAME, null, null);
 		db.delete(SyncInfoEntry.TABLE_NAME, null, null);
@@ -1118,7 +1118,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
 	/**
 	 * Deletes all records from {@link PacketEntry}s and {@link de.tudarmstadt.informatik.hostage.logging.AttackRecord}.
 	 */
-	public void clearData() {
+	public synchronized void clearData() {
 		SQLiteDatabase db = this.getReadableDatabase();
 		db.delete(PacketEntry.TABLE_NAME, null, null);
 		db.delete(AttackEntry.TABLE_NAME, null, null);
@@ -1800,7 +1800,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
      * @param includeMissing boolean
      * @return array of {@link de.tudarmstadt.informatik.hostage.logging.SyncDevice}s
      */
-    public ArrayList<SyncDevice> getUpdatedDevicesFor(HashMap<String, Long> oldDeviceMap, boolean includeMissing){
+    public synchronized  ArrayList<SyncDevice> getUpdatedDevicesFor(HashMap<String, Long> oldDeviceMap, boolean includeMissing){
 
         ArrayList<SyncDevice> recordList = new ArrayList<SyncDevice>();
         String selectQuery = "SELECT * FROM " + SyncDeviceEntry.TABLE_NAME;
@@ -1834,7 +1834,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
      * Returns all device ids.
      * @return list of all device ids.
      */
-    public ArrayList<String> getAllDevicesIds(){
+    public synchronized  ArrayList<String> getAllDevicesIds(){
 
         String selectQuery = "SELECT "+ SyncDeviceEntry.COLUMN_NAME_DEVICE_ID+" FROM " + SyncDeviceEntry.TABLE_NAME;
         SQLiteDatabase db = this.getReadableDatabase();
@@ -1860,7 +1860,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
      * @param devices owned device ids
      * @return list of missing devices ids
      */
-    public ArrayList<String> getMissingDeviceIds(ArrayList<String> devices){
+    public synchronized  ArrayList<String> getMissingDeviceIds(ArrayList<String> devices){
         ArrayList<String> ids = new ArrayList<String>();
         String prefix = " D WHERE " + SyncDeviceEntry.COLUMN_NAME_DEVICE_ID + " NOT IN ";
         String selectQuery = "SELECT "+ SyncDeviceEntry.COLUMN_NAME_DEVICE_ID +" FROM " + SyncDeviceEntry.TABLE_NAME + this.arrayToSQLString(devices,prefix);
@@ -1886,7 +1886,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
      * @param includeMissingDevices boolean
      * @return list of {@link de.tudarmstadt.informatik.hostage.logging.AttackRecord}s
      */
-    public ArrayList<SyncRecord> getUnsyncedAttacksFor(HashMap<String,Long> deviceMap, boolean includeMissingDevices){
+    public synchronized  ArrayList<SyncRecord> getUnsyncedAttacksFor(HashMap<String,Long> deviceMap, boolean includeMissingDevices){
 
         ArrayList<SyncDevice> updatedDevices = this.getUpdatedDevicesFor(deviceMap, includeMissingDevices);
 
@@ -1968,7 +1968,7 @@ public class HostageDBOpenHelper extends SQLiteOpenHelper {
      * Inserts the given devices in the database with save.
      * @param devices list of {@link de.tudarmstadt.informatik.hostage.logging.SyncDevice}s
      */
-    public void insertSyncDevices(List<SyncDevice> devices){
+    public synchronized void insertSyncDevices(List<SyncDevice> devices){
         SQLiteDatabase db = this.getWritableDatabase();
 
         db.beginTransaction();

src/de/tudarmstadt/informatik/hostage/sync/bluetooth/BluetoothSyncActivity.java

@@ -50,17 +50,12 @@ public class BluetoothSyncActivity extends Activity{
 	private TextView mInfoText;
 	private ListView listView;
 
-    private HostageDBOpenHelper mDbHelper;
-    private Synchronizer synchronizer;
 
 	@Override
 	public void onCreate(Bundle savedInstanceState){
 		super.onCreate(savedInstanceState);
 		setContentView(R.layout.activity_bluetooth);
 
-        mDbHelper = new HostageDBOpenHelper(getApplicationContext());
-        synchronizer = new Synchronizer(mDbHelper);
-
 		serviceUUID = UUID.fromString(getResources().getString(R.string.UUID));
 		mBluetoothAdapter = BluetoothAdapter.getDefaultAdapter();	
 		arrayAdapter = new ArrayAdapter<String>(this, R.layout.list_view_bluetooth_devices);