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package com.clarkson.sensormodeldatacollector; import java.io.BufferedReader; import java.io.File; import java.io.FileOutputStream; import java.io.FileWriter; import java.io.IOException; import java.io.InputStreamReader; import java.io.OutputStreamWriter; import java.net.URL; import java.net.URLConnection; import java.util.ArrayList; import java.util.Collections; import java.util.HashMap; import java.util.HashSet; import java.util.Iterator; import java.util.List; import java.util.Queue; import java.util.Random; import java.util.Timer; import java.util.TimerTask; /*from w ww . j a v a2s .c o m*/ import android.annotation.SuppressLint; import android.app.Activity; import android.app.AlertDialog; import android.content.BroadcastReceiver; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.content.IntentFilter; import android.content.res.Resources; import android.net.wifi.ScanResult; import android.net.wifi.WifiConfiguration; import android.net.wifi.WifiManager; import android.os.Bundle; import android.os.Environment; import android.os.Handler; import android.os.SystemClock; import android.util.Log; import android.view.View; import android.view.View.OnClickListener; import android.widget.AdapterView; import android.widget.Button; import android.widget.CheckBox; import android.widget.EditText; import android.widget.ListView; import android.widget.SimpleAdapter; import android.widget.TextView; import android.widget.Toast; /** * Wi-Fi Scan Activity. * * <P>Controls starting and stopping the wi-fi scan activity for data collection * * <P>Note that a timer activity thread is used to schedule the repeating Wi-Fi scans. * * @author James Licata * @version 1.0 */ public class WiFiScanActivity extends Activity implements OnClickListener { //The wifi manager provides the system level API calls to the wifi hardware WifiManager mWifiManager; Bundle mMainMenuExtras; //Member variable to hold the AP count for a given scan int mWifiManagerScanResultsCount = 0; //List member variable to store wifi scan results List<ScanResult> mWifiManagerScanResults; //Placeholder value for hash key for a wifi scan result String ITEM_KEY = "key"; //Placeholder array list using hash keys for wifi scan results ArrayList<HashMap<String, WiFiScanResult>> mScanResultHash = new ArrayList<HashMap<String, WiFiScanResult>>(); //Arraylist to store wifi scan results ArrayList<WiFiScanResult> mScanResultsArrayList = new ArrayList<WiFiScanResult>(); //Custom Android Adapter for updating list views with wifi scan results WiFiScanResultAdapter mWifiScanResultAdapter; //Public member variable tracking the current number of scans count public int mNumberOfScansCounter = 0; AlertDialog.Builder mWriteToFileDialog; AlertDialog.Builder mResetScanResultsDialog; AlertDialog.Builder mServerConnectionDialog; public int mCurrentlySelectedItemIndex = -1; public String mCurrentlySelectedItemRSSString = ""; final int NUMBER_DEFAULT_SCAN_ITEMS = 2; private final String mDefaultServerURL = "http://192.168.1.6:9999/SensorModelServletProject/SensorModelServlet"; //Historical hashmap to continue to collect RSS values for APs we encounter in multiple scans WiFiScanResultHashMap mScanResultsHashMap = new WiFiScanResultHashMap(); //Indicator for weather scan is running or not public boolean mScanRunning = false; public boolean mResetScanResults = false; public boolean mReceiverRegistered = false; //The list view object gives a handle to the list that appears to the user on the Wi-Fi activity page ListView mScanResultsListView; //The button object provides a handle to the Start/Stop scan button that appears to the user on the Wi-Fi activity page Button mStartStopScanButton; //The button object provides a handle to the one shot scan button that appears to the user on the Wi-Fi activity page Button mOneShotScanButton; //Wifi Scan Timer Task Members //Wifi scheduled timer task TimerTask mTimerTask; //Wifi scan timer Timer mScanTimer = new Timer(); //Defined handler for the wifi scan timer task private Handler mScanTimerHandler = new Handler(); BroadcastReceiver mBroadcastReceiver; public long mMillisecondsSinceBoot = 0; public long mWifiScanIntervalMilliseconds = 5000; //Default 5 seconds public boolean mSSIDFilterEnabled = false; public String mSSIDFilter = "CiscoLinksys"; public boolean mWriteToCSVFile = false; public boolean mConnectToServer = false; //Default to not connecting to server public enum ServerStatus{ SENSOR_MODEL_SERVER_CONNECTED(4), SENSOR_MODEL_SERVER_DISCONNECTED(0); private ServerStatus(int connection_status){ this.connection_status = connection_status; } private int connection_status; public int getStatus(){ return this.connection_status; } public String toString(){ return String.valueOf(this.connection_status); } } public ServerStatus mServerConnectionCode; /** * Called when the activity is first created * * This method is basically the "constructor" for the activity. * @param savedInstanceState - top level android application instance */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.wifi_scan_layout); Log.d(getLocalClassName(), "Step 3"); mStartStopScanButton = (Button) findViewById(R.id.start_scan_button); mStartStopScanButton.setOnClickListener(this); mOneShotScanButton = (Button) findViewById(R.id.one_shot_scan_button); mOneShotScanButton.setOnClickListener(this); mScanResultsListView = (ListView)findViewById(R.id.AP_list); mMainMenuExtras = getIntent().getExtras(); if(mMainMenuExtras != null) { mConnectToServer = mMainMenuExtras.getBoolean("mConnectToServer"); mWifiScanIntervalMilliseconds = 1000*mMainMenuExtras.getLong("mWifiScanIntervalSeconds"); this.mSSIDFilter = mMainMenuExtras.getString("mSSIDFilter"); this.mSSIDFilterEnabled = mMainMenuExtras.getBoolean("mSSIDFilterEnabled"); }//if Resources application_resources =getResources(); mWifiManager = (WifiManager) getSystemService(Context.WIFI_SERVICE); if (mWifiManager.isWifiEnabled() == false) { Toast.makeText(getApplicationContext(), "wifi is disabled..making it enabled", Toast.LENGTH_LONG).show(); mWifiManager.setWifiEnabled(true); }//if //Initialize the list view with default data setWiFiScanListData(); mWifiScanResultAdapter = new WiFiScanResultAdapter(this, mScanResultsArrayList, application_resources); mScanResultsListView.setAdapter(mWifiScanResultAdapter); buildAlertDialogs(); checkServerConnection(); }//onCreate public void checkServerConnection() { if(mConnectToServer == true) { mServerConnectionDialog.show(); }//if else { //Do nothing }//else }//checkServerConnection /** * Called when the WiFi scan activity exits back to the main menu */ @Override protected void onStop() { Log.d(getLocalClassName(), "OnStop, unregistering receiver"); unregisterReceiver(mBroadcastReceiver); super.onStop(); }//onStop /** * Creates all Dialogs that appear during user interaction with Wifi Scan Activity */ private void buildAlertDialogs() { //Set up our write to file dialog mWriteToFileDialog = new AlertDialog.Builder( WiFiScanActivity.this); // Setting Dialog Title mWriteToFileDialog.setTitle("Confirm Write To File"); // Setting Dialog Message mWriteToFileDialog.setMessage("Would you like to capture this AP's scan results in a CSV file?"); // Setting Icon to Dialog mWriteToFileDialog.setIcon(R.drawable.new_document); // Setting Positive "Yes" button mWriteToFileDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Write your code here to execute after dialog mWriteToCSVFile = true; Toast.makeText(getApplicationContext(), "Writing to SD Card...", Toast.LENGTH_SHORT) .show(); if(writeAPDataToCSVFile() == true) { //Let user know file written successfully Toast.makeText(getApplicationContext(), "File written successfully!", Toast.LENGTH_SHORT) .show(); }//if else { Toast.makeText(getApplicationContext(), "Writing file to SD card failed!", Toast.LENGTH_SHORT) .show(); }//else }//onClick });//setPositiveButton // Setting Negative "NO" Button mWriteToFileDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Write your code here to execute after dialog mWriteToCSVFile = false; /*Toast.makeText(getApplicationContext(), "You clicked on NO", Toast.LENGTH_SHORT) .show();*/ dialog.cancel(); }//onClick });//setNegativeButton //Set up our reset scan results dialog mResetScanResultsDialog = new AlertDialog.Builder( WiFiScanActivity.this); // Setting Dialog Title mResetScanResultsDialog.setTitle("Reset all scan results?"); // Setting Dialog Message mResetScanResultsDialog.setMessage("Would you like reset the scan counter and collected AP data?"); // Setting Icon to Dialog mResetScanResultsDialog.setIcon(R.drawable.ic_delete); // Setting Positive "Yes" button mResetScanResultsDialog.setPositiveButton("YES", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Write your code here to execute after dialog mResetScanResults = true; Toast.makeText(getApplicationContext(), "Resetting scan results...", Toast.LENGTH_SHORT) .show(); resetScanResults(); try { Thread.sleep(500); } catch (InterruptedException e) { // TODO Auto-generated catch block e.printStackTrace(); } //Let user know file written successfully Toast.makeText(getApplicationContext(), "Scan results reset!", Toast.LENGTH_SHORT) .show(); }//onClick });//setPositiveButton // Setting Negative "NO" Button mResetScanResultsDialog.setNegativeButton("NO", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Write your code here to execute after dialog mResetScanResults = false; /*Toast.makeText(getApplicationContext(), "You clicked on NO", Toast.LENGTH_SHORT) .show();*/ dialog.cancel(); }//onClick });//setNegativeButton //Set up our server connection dialog mServerConnectionDialog = new AlertDialog.Builder( WiFiScanActivity.this); // Setting Dialog Title mServerConnectionDialog.setTitle("Server Connection"); // Setting Dialog Message mServerConnectionDialog.setMessage("Click OK to check server connection"); // Setting Icon to Dialog mServerConnectionDialog.setIcon(R.drawable.ic_launcher); // Setting Positive "Yes" button mServerConnectionDialog.setPositiveButton("Ok", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Write your code here to execute after dialog Toast.makeText(getApplicationContext(), "Testing server connection...", Toast.LENGTH_SHORT) .show(); if(testServerConnection() == true) { //Let user know file written successfully Toast.makeText(getApplicationContext(), "Server connected successfully", Toast.LENGTH_SHORT) .show(); }//if else { Toast.makeText(getApplicationContext(), "Problem connecting to server, please check your settings!", Toast.LENGTH_SHORT) .show(); }//else }//onClick });//setPositiveButton // Setting Negative "Cancel" Button mServerConnectionDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { // Write your code here to execute after dialog /*Toast.makeText(getApplicationContext(), "You clicked on NO", Toast.LENGTH_SHORT) .show();*/ dialog.cancel(); }//onClick });//setNegativeButton }//buildAlertDialogs /** * Tests the apps ability to connect to the Servlet */ boolean testServerConnection() { boolean server_status = false; Random test_code_generator = new Random(); int test_code_number = test_code_generator.nextInt(10); //Generate random number between 0 and 10 int test_code_response = 0; try{ //108.26.49.81 URL url = new URL(mDefaultServerURL); //URL url = new URL("http://108.26.49.81:9999/SensorModelServletProject/SensorModelServlet"); URLConnection sensor_model_servlet = url.openConnection(); //inputString = URLEncoder.encode(inputString, "UTF-8"); String test_code_input_string = String.valueOf(test_code_number); Log.d(getLocalClassName(), "Test code input: " + test_code_input_string); sensor_model_servlet.setDoOutput(true); OutputStreamWriter out = new OutputStreamWriter(sensor_model_servlet.getOutputStream()); out.write(test_code_input_string); out.close(); BufferedReader in = new BufferedReader(new InputStreamReader(sensor_model_servlet.getInputStream())); String returnString=""; mServerConnectionCode = ServerStatus.SENSOR_MODEL_SERVER_DISCONNECTED; while ((returnString = in.readLine()) != null) { Log.d("returnString", returnString); Log.d("enum value connected: ", ServerStatus.SENSOR_MODEL_SERVER_CONNECTED.toString()); test_code_response = Integer.valueOf(returnString); } in.close(); } catch(Exception e) { Log.d("Exception",e.toString()); } if(test_code_response == test_code_number*2 && test_code_response <= 20) { server_status = true; Log.d(getLocalClassName(), "Test code response: " + String.valueOf(test_code_response)); } return server_status; } /** * Called when the activity is first created * * This method initializes the wifi scan result list view with default values to orient * the user to the displayed data format */ public void setWiFiScanListData() { for (int i = 0; i < NUMBER_DEFAULT_SCAN_ITEMS; i++) { Log.d(getLocalClassName(), "Filling default item#"+i); final WiFiScanResult default_wifi_scan_result = new WiFiScanResult(); //Set the wifi scan result members Log.d(getLocalClassName(), "SystemClock: "+mMillisecondsSinceBoot); default_wifi_scan_result.setSSID("Test SSID#"+i); default_wifi_scan_result.setRSS(i, mMillisecondsSinceBoot); //dummy_item.setFrequency(i*1000); //Add default item to the array list mScanResultsArrayList.add( default_wifi_scan_result ); }//for }//setWiFiScanListData /** * Called when a button on the WiFiScanActivity view is pressed * * Decides which method to call based on the buton type pressed * @param view - the view shed for the current activity */ public void onClick(View view) { Log.d(getLocalClassName(), "Step 5"); switch (view.getId()) { case R.id.one_shot_scan_button: onOneShotScanClick(); break; case R.id.start_scan_button: onStartScanningClick(); break; default: onStartScanningClick(); break; }//switch }//onClick public void registerWifiScanReceiver() { registerReceiver(mBroadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context c, Intent intent) { mWifiManagerScanResults = mWifiManager.getScanResults(); mWifiManagerScanResultsCount = mWifiManagerScanResults.size(); Log.d(getLocalClassName(), "Step 4: HandleScanResults"); handleScanResults(); } }, new IntentFilter(WifiManager.SCAN_RESULTS_AVAILABLE_ACTION)); mReceiverRegistered = true; } public void unregisterWifiScanReceiver() { unregisterReceiver(mBroadcastReceiver); mReceiverRegistered = false; }//unregisterWifiScanReceiver /** * Called when the Start/Stop scan button is pressed * * This method clears out any previous scan results and schedules a new wifi scan timer task * If the scan is already running, then this method halts the timer task and resets the scan counter * If the one shot scan button is clicked, scan results are cleared out and a single scan is performed */ public void onStartScanningClick() { if(mStartStopScanButton.getText().toString().equals(getResources().getString(R.string.perform_scan))) { if(mNumberOfScansCounter == 0) { //Set time to normalize scan results to if this is the first scan mMillisecondsSinceBoot = SystemClock.uptimeMillis(); }//if mScanResultsArrayList.clear(); mWifiScanResultAdapter.disableItemsSelection(); Log.d(getLocalClassName(), "Step 5.1"); //startTime = SystemClock.uptimeMillis(); mStartStopScanButton.setText(R.string.stop_scan); mScanRunning = true; if(mReceiverRegistered == false) { registerWifiScanReceiver(); }//if scheduleWifiScanTimerTask(false); }//if else { mWifiScanResultAdapter.enableItemsSelection(); Log.d(getLocalClassName(), "Step 5.2"); //Halt the wifi scan timer task mTimerTask.cancel(); mScanRunning = false; //Set the Scan button text back to performing the scan mStartStopScanButton.setText(R.string.perform_scan); mResetScanResultsDialog.show(); if(mReceiverRegistered) { unregisterWifiScanReceiver(); }//if }//else }//onStartScanningClick public void onOneShotScanClick() { Log.d(getLocalClassName(), "Step 5(one shot)"); if(mScanRunning == true) { mWifiScanResultAdapter.enableItemsSelection(); Log.d(getLocalClassName(), "Step 5.2"); //Halt the wifi scan timer task mTimerTask.cancel(); mScanRunning = false; //Set the Scan button text back to performing the scan mStartStopScanButton.setText(R.string.perform_scan); mResetScanResultsDialog.show(); }//if mMillisecondsSinceBoot = SystemClock.uptimeMillis(); mWifiScanResultAdapter.disableItemsSelection(); Log.d(getLocalClassName(), "Step 5.1"); mScanRunning = true; if(mReceiverRegistered == false) { registerWifiScanReceiver(); }//if scheduleWifiScanTimerTask(true); unregisterWifiScanReceiver(); mScanRunning = false; }//onClick /** * Called when user requests after a stop scan * * Resets all necessary parameters involved with scan management */ public void resetScanResults() { //Reset the scan counter mNumberOfScansCounter = 0; //Reset the time of reference clock //Clear out the associated scan result arrays mScanResultsArrayList.clear(); mScanResultHash.clear(); mWifiManagerScanResults.clear(); mScanResultsHashMap.clear(); mWifiScanResultAdapter.notifyDataSetChanged(); }//resetScanResults /** * Called to schedule a wifi scan timer task * * This method initializes the wifi scan timer task and calls the performScan method. */ public void scheduleWifiScanTimerTask(boolean oneShot) { mTimerTask = new TimerTask() { public void run() { mScanTimerHandler.post(new Runnable() { public void run() { performScan(); Log.d("TIMER", "TimerTask run"); }//run });//Runnable }};//TimerTask // public void schedule (TimerTask task, long delay, long period) //mScanTimer.schedule(mTimerTask, 500, Integer.parseInt(scanText.getText().toString())); if(oneShot == true) { mScanTimer.schedule(mTimerTask, 500); try { synchronized (this) { wait(1002); } } catch (InterruptedException e) { Log.d(getLocalClassName(), "Waiting didnt work!!"); e.printStackTrace(); } }//if else { mScanTimer.schedule(mTimerTask, 500, 5000); }//else }//scheduleWifiScanTimerTask /** * Called to start a wifi scan * * This method utilizes the wifi manager to start a wifi scan */ public void performScan() { mWifiManager.startScan(); }//performScan /** * Called from within the registered system broadcast receiver * to handle a completed wifi scan's results * * This method iterates through the wifi AP scan results and creates WiFiScanResult objects. * These objects are added to a HashSet, duplicates are removed, and added to the array list * that is connected to the Activity list view through our custom adapter. */ public void handleScanResults() { Log.d(getLocalClassName(), "Step 4"); //Increase the scan counter mNumberOfScansCounter++; //Alert user what the current scan number is so he/she knows wifi scans are continuing to complete successfully Toast.makeText(this, "Scanning...Scan #"+mNumberOfScansCounter, Toast.LENGTH_SHORT).show(); //Log our current scan count Log.d(getLocalClassName(), "STEP 5A: scan #"+mNumberOfScansCounter); try { //Scan results are 0 indexed, so subtract one for our while mWifiManagerScanResultsCount = mWifiManagerScanResultsCount - 1; //Loop through the scan results and add them to our array list while (mWifiManagerScanResultsCount >= 0) { //Need to utilize hash functionality and update RSS/keep history //HashMap<String, String> item = new HashMap<String, String>(); WiFiScanResult scan_result_item = new WiFiScanResult(); //item.put(ITEM_KEY, results.get(size).SSID + " " + results.get(size).capabilities); //Set the SSID (Name) for the scan result scan_result_item.setSSID(mWifiManagerScanResults.get(mWifiManagerScanResultsCount).SSID); //Set the RSS (signal strength level) and timestamp normalized to program start time scan_result_item.setRSS(mWifiManagerScanResults.get(mWifiManagerScanResultsCount).level, SystemClock.uptimeMillis()-mMillisecondsSinceBoot); //Set the BSSID (Mac Address) scan_result_item.setMac_address(mWifiManagerScanResults.get(mWifiManagerScanResultsCount).BSSID); //Set the frequency scan_result_item.setFrequency(mWifiManagerScanResults.get(mWifiManagerScanResultsCount).frequency); //Log the scan result fields Log.d(getLocalClassName(), "STEP 5B: " + scan_result_item.printMe()); //Add the scan result item to the results Array List only if matches SSID filter if(this.mSSIDFilterEnabled == true) { Log.d(getLocalClassName(), "SSID: " + scan_result_item.getSSID()); Log.d(getLocalClassName(), "SSID Filter: " + this.mSSIDFilter + "*"); if (scan_result_item.getSSID().matches(this.mSSIDFilter + "(.*)")) { mScanResultsHashMap.addItem(scan_result_item); }//if }//if else { mScanResultsHashMap.addItem(scan_result_item); }//else //mScanResultsArrayList.add(scan_result_item); //Use a hash set to remove duplicates //HashSet<WiFiScanResult> duplicate_filter = new HashSet<WiFiScanResult>(); //duplicate_filter.addAll(mScanResultsArrayList); mScanResultsArrayList.clear(); mScanResultsArrayList.addAll(mScanResultsHashMap.values()); Collections.sort(mScanResultsArrayList); mWifiManagerScanResultsCount--; mWifiScanResultAdapter.notifyDataSetChanged(); Log.d(getLocalClassName(), "Step 6.2: (Size= " + mScanResultsArrayList.size()); }//while }//try catch (Exception e) { Log.d(getLocalClassName(), "Step 6.2A: Errors"); }//catch }//handleScanResults /***************** This function used by WiFiScanResultAdapter ****************/ public void onItemClick(int itemPosition) { Log.d(getLocalClassName(), "Step 10: OnItemClick"); if(mScanRunning == false && mScanResultsArrayList.isEmpty() == false) { WiFiScanResult tempValues = ( WiFiScanResult ) mScanResultsArrayList.get(itemPosition); Queue<TimestampedRSS> all_rss_values = tempValues.getAllRSS(); String rss_string = ""; Iterator<TimestampedRSS> rss_iterator = all_rss_values.iterator(); while (rss_iterator.hasNext() == true) { Log.d(getLocalClassName(), "Step 10A: RSS Strings Assembled"); rss_string = rss_string + (rss_iterator.next().toString()) + ","; } setItemClickAttributes(itemPosition, rss_string); // SHOW ALERT // Showing Alert Dialog mWriteToFileDialog.show(); Toast.makeText(this, ""+tempValues.getSSID() + "\nRSS: " + rss_string +"\nFreq: "+tempValues.getFrequency() + "\nChan: "+tempValues.getChannel() + "\nMAC: " + tempValues.getMac_address(), Toast.LENGTH_LONG) .show(); }//if }//onItemClick void setItemClickAttributes(int index, String rssString) { mCurrentlySelectedItemIndex = index; mCurrentlySelectedItemRSSString = rssString; } @SuppressLint("SdCardPath") boolean writeAPDataToCSVFile() { boolean file_written_successfully = false; WiFiScanResult selected_AP_scan_result_data = ( WiFiScanResult ) mScanResultsArrayList.get(mCurrentlySelectedItemIndex); if(mWriteToCSVFile == true && Environment.getExternalStorageState() != Environment.MEDIA_MOUNTED_READ_ONLY) { try { String output_string="SSID,Channel,Frequency,MAC,RSS,Timestamp,(1:N)\n"; Log.d(getLocalClassName(), "Step 11A: Logging to CSV file"); //File output_folder = new File(Environment.getExternalStorageDirectory() + File.separator + "SensorModelDataCollector"); File new_file = getFilesDir(); boolean folder_success = true; if (!new_file.exists()) { //folder_success = output_folder.mkdir(); folder_success |= new_file.mkdir(); } if(folder_success == true) { String output_filename = selected_AP_scan_result_data.mSSID+"_"+selected_AP_scan_result_data.getLatestTimestampedRSS().mTimestamp+".csv"; //File output_file = new File(output_folder, output_filename); File output_file = new File(new_file, output_filename); if (output_file.exists() == false) { output_file.createNewFile(); //output_file2.createNewFile(); }//if - file doesn't exist, create it if(output_file.canWrite() == true) { FileWriter output_file_writer = new FileWriter(output_file); output_string += selected_AP_scan_result_data.mSSID + ","; output_string += selected_AP_scan_result_data.channel + ","; output_string += selected_AP_scan_result_data.frequency_MHz + ","; output_string += selected_AP_scan_result_data.getMac_address() + ","; Queue<TimestampedRSS> all_rss_values = selected_AP_scan_result_data.getAllRSS(); String rss_string = ""; Iterator<TimestampedRSS> rss_iterator = all_rss_values.iterator(); while (rss_iterator.hasNext() == true) { Log.d(getLocalClassName(), "Step 10A: RSS Strings Assembled"); rss_string = rss_string + rss_iterator.next().rssTimestampPair() + ","; } output_string += rss_string + "\n"; Log.d(getLocalClassName(), "Step 10C: "+output_string); output_file_writer.append(output_string); output_file_writer.flush(); output_file_writer.close(); file_written_successfully = true; } else { Log.d(getLocalClassName(), "Step 10C: No file write access permission"); } } } catch (IOException ioe) {ioe.printStackTrace();} } else { Log.d(getLocalClassName(), "Step 11B: mWriteToCSVFile set to false or media not mounted for write"); } return file_written_successfully; }//writeAPDataToCSVFile }