where to set data received from wifi hotspot server

[NeelNisha Singh]

Hello JavaRanch,

Here Scenario is I'm able to establish communication with WiFi Hotspot server with my android client application,if I'm sending data to server it's getting received by server,
But server sent data not showing inside the text(txtrecv)I've tried to set received data from server inside the method onProgressUpdate()

Here is the code what I'm have tried,


1.

public class WIFIMainActivity extends Activity implements OnClickListener {

	protected static final int CHOOSE_FILE_RESULT_CODE = 20;
	TextView mainText, txtResult, txtSendingMsg, txtRecMsg;
	Button btnSend, btnRec;
	ListView lv;
	WifiManager mainWifi;
	WifiReceiver receiverWifi;
	List<ScanResult> wifiList;
	List<WifiConfiguration> wifiList2;
	ArrayList<String> connections = new ArrayList<String>();
	ArrayAdapter<String> adapter;
	WifiInfo info;
	StringBuilder sb = new StringBuilder();
	int scanSize = 0;
	int configuredSize = 0;
	ProgressDialog progressDialog = null;
	WifiInfo wifiInfo;
	public static String ipAddress = null;// ur ip
	public static int portNumber = 502;// portnumber
	private TCPAndroidClient mTcpClient;

	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		initialize();

		Toast.makeText(getApplicationContext(), "oncreate() method completed ",
				Toast.LENGTH_LONG).show();

	}

	private void initialize() {
		mainText = (TextView) findViewById(R.id.textStatus);
		txtSendingMsg = (TextView) findViewById(R.id.txtSendingMsg);
		txtResult = (TextView) findViewById(R.id.textStatusResult);
		txtRecMsg = (TextView) findViewById(R.id.txtRecMsg);
		btnSend = (Button) findViewById(R.id.btnSend);
		btnSend.setOnClickListener(this);
		btnRec = (Button) findViewById(R.id.btnRec);
		btnRec.setOnClickListener(this);
		lv = (ListView) findViewById(R.id.list);

		mainWifi = (WifiManager) getSystemService(Context.WIFI_SERVICE);

		if (mainWifi.isWifiEnabled() == false) {
			Toast.makeText(getApplicationContext(),
					"wifi is disabled..making it enabled", Toast.LENGTH_LONG)
					.show();
			mainWifi.setWifiEnabled(true);
		}
		receiverWifi = new WifiReceiver();

		registerReceiver(receiverWifi, new IntentFilter(
				WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));

		mainWifi.startScan();
		mainText.setText("\\nStarting Scan...\\n");

		adapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, connections);

		lv.setAdapter(this.adapter);

		// connect to the server
		new connectTask().execute("");

		// String receivedMsg=mTcpClient.serverMessage;
		// txtRecMsg.setText(receivedMsg);
		// mTcpClient.serverMessage=null;

	}

	public boolean onCreateOptionsMenu(Menu menu) {
		menu.add(0, 0, 0, "Refresh");
		return super.onCreateOptionsMenu(menu);

	}

	public boolean onMenuItemSelected(int featureId, MenuItem item) {// on
																		// selecting
																		// refresh
																		// menu
																		// from
																		// MenuItem

		mainWifi.startScan();
		mainText.setText("WIFI Scanning Result:");

		// if (mTcpClient != null) {
		// txtRecMsg.setText(mTcpClient.receiveMessage());
		// }

		return super.onMenuItemSelected(featureId, item);
	}

	protected void onPause() {
		unregisterReceiver(receiverWifi);
		super.onPause();
	}

	protected void onResume() {
		registerReceiver(receiverWifi, new IntentFilter(
				WifiManager.SCAN_RESULTS_AVAILABLE_ACTION));
		super.onResume();
	}

	class WifiReceiver extends BroadcastReceiver {
		public void onReceive(Context c, Intent intent) {
			sb = new StringBuilder();
			wifiList = mainWifi.getScanResults();

			wifiList2 = mainWifi.getConfiguredNetworks();

			scanSize = wifiList.size();

			configuredSize = wifiList2.size();
			connections.clear();

			Toast.makeText(getApplicationContext(),
					"size mainWifi.getScanResults();" + scanSize,
					Toast.LENGTH_LONG).show();
			Toast.makeText(
					getApplicationContext(),
					"ConfiguredNetwork size mainWifi.getConfiguredNetworks();"
							+ configuredSize, Toast.LENGTH_LONG).show();

			for (int i = 0; i < wifiList.size(); i++) {

				String resultwifiInfo = "configuredSSID: "
						+ wifiList.get(i).SSID;

				sb.append(new Integer(i + 1).toString() + ".");
				sb.append((wifiList.get(i)).toString() + ",");
				sb.append(resultwifiInfo + ",\\n");
				sb.append("\\n");

				connections.add(resultwifiInfo);
			}
			txtResult.setText(sb);
		}
	}

	@Override
	public void onClick(View v) {
		switch (v.getId()) {
		case R.id.btnSend:

			String message = txtSendingMsg.getText().toString();

			// add the text in the arrayList
			// arrayList.add("c: " + message);

			// sends the message to the server
			if (mTcpClient != null) {
				mTcpClient.sendMessage(message);
			}

			// refresh the list
			// mAdapter.notifyDataSetChanged();
			txtSendingMsg.setText("");

			break;

		case R.id.btnRec:
			txtRecMsg.setText("");
			String recvdData = "";
			if (mTcpClient != null) {
				recvdData = mTcpClient.receiveMessage();

			}
			txtRecMsg.setText(recvdData);

			break;

		default:
			break;
		}

	}

	public String intToIp(int addr) {
		return ((addr & 0xFF) + "." + ((addr >>>= 8) & 0xFF) + "."
				+ ((addr >>>= 8) & 0xFF) + "." + ((addr >>>= 8) & 0xFF));
	}

	public class connectTask extends
			AsyncTask<String, String, TCPAndroidClient> {

		@Override
		protected TCPAndroidClient doInBackground(String... message) {

			// we create a TCPClient object and
			mTcpClient = new TCPAndroidClient(
					new TCPAndroidClient.OnMessageReceived() {
						@Override
						// here the messageReceived method is implemented
						public void messageReceived(String message) {
							// this method calls the onProgressUpdate
							publishProgress(message);
							// here progress task will keep on running
						}
					});
			mTcpClient.run();

			return null;
		}

		@Override
		protected void onProgressUpdate(String... values) {
			super.onProgressUpdate(values);

			StringBuilder sb = new StringBuilder();

			for (int i = 0; i < values.length; i++) {
				sb.append(values[i]);

			}

			txtRecMsg.setText(sb);
			sb = null;
		}

		@Override
		protected void onPreExecute() {
			// TODO Auto-generated method stub
			super.onPreExecute();
		}

		@Override
		protected void onPostExecute(TCPAndroidClient result) {
			// TODO Auto-generated method stub
			super.onPostExecute(result);
		}

	}

	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		// TODO Auto-generated method stub
		super.onActivityResult(requestCode, resultCode, data);
	}
}

2.

public class TCPAndroidClient {

	public static String serverMessage;
	public static final String SERVERIP ="192.168.137.1"; //"192.168.173.1";// //"10.212.11.188";//"192.168.0.102";
															// //your computer
															// IP address
	public static final int SERVERPORT = 502;// 4444;
	private OnMessageReceived mMessageListener = null;
	private boolean mRun = false;

	PrintWriter out;
	BufferedReader in;

	/**
	 * Constructor of the class. OnMessagedReceived listens for the messages
	 * received from server
	 */
	public TCPAndroidClient(OnMessageReceived listener) {
		mMessageListener = listener;
	}

	/**
	 * Sends the message entered by client to the server
	 * 
	 * @param message
	 *            text entered by client
	 */
	public void sendMessage(String message) {
		if (out != null && !out.checkError()) {
			out.println(message);
			out.flush();
			
			
		

		}
	}

	public String receiveMessage() {

		if (in != null) {

			try {
				serverMessage = in.readLine();

			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}

		}
		return serverMessage;
	}

	public void stopClient() {
		mRun = false;
	}

	public void run() {

		mRun = true;

		try {
			// here you must put your computer's IP address.
			// InetAddress serverAddr = InetAddress.getByName(SERVERIP);
			// ipAddress="192.168.137.1";

			Log.e("TCP Client", "C: Connecting...");

			// create a socket to make the connection with the server
			Socket socket = new Socket(SERVERIP, SERVERPORT);

			try {

				// send the message to the server
				out = new PrintWriter(new BufferedWriter(
						new OutputStreamWriter(socket.getOutputStream())), true);

				Log.e("TCP Client", "C: Sent.");

				Log.e("TCP Client", "C: Done.");

				// receive the message which the server sends back
				in = new BufferedReader(new InputStreamReader(
						socket.getInputStream()));

				// in this while the client listens for the messages sent by the
				// server
				while (mRun) {
					serverMessage = in.readLine();

					if (serverMessage != null && mMessageListener != null) {
						// call the method messageReceived from MyActivity class
						mMessageListener.messageReceived(serverMessage);
					}
					// serverMessage = null;

				}

				Log.e("RESPONSE FROM SERVER", "S: Received Message: '"
						+ serverMessage + "'");

			} catch (Exception e) {

				Log.e("TCP", "S: Error", e);

			} finally {
				// the socket must be closed. It is not possible to reconnect to
				// this socket
				// after it is closed, which means a new socket instance has to
				// be created.
				// socket.close();
			}

		} catch (Exception e) {

			Log.e("TCP", "C: Error", e);

		}

	}

	// Declare the interface. The method messageReceived(String message) will
	// must be implemented in the MyActivity
	// class at on asynckTask doInBackground
	public interface OnMessageReceived {
		public void messageReceived(String message);
	}

}

3.xml file

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">

    <LinearLayout
        android:id="@+id/frstlin"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

       <TextView
           android:id="@+id/textStatus"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"/>
       
        <TextView
            android:id="@+id/textStatusResult"
            android:layout_width="match_parent"
            android:layout_height="40dp"
            android:layout_below="@+id/textStatus" />
     
    </LinearLayout>
    
    <ListView
        android:id="@+id/list"
        android:layout_width="wrap_content"
        android:layout_height="198dp"
        android:layout_alignParentRight="true"
        android:layout_below="@+id/frstlin" >
        
    </ListView>
    
    <LinearLayout
        android:id="@+id/secondlin"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/list"
        android:orientation="horizontal" >
     <EditText
            android:id="@+id/txtRecMsg"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="0.46"
            android:gravity="center_horizontal"
            android:hint="Message Received from server" />
     <Button
            android:id="@+id/btnRec"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:text="Refresh" />
     </LinearLayout>

    <LinearLayout
        android:id="@+id/secondlin"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/txtRecMsg"
        android:orientation="horizontal" >

        <EditText
            android:id="@+id/txtSendingMsg"
            android:layout_width="wrap_content"
            android:layout_height="match_parent"
            android:layout_weight="0.46"
            android:gravity="center_horizontal"
            android:hint="Type Message and send" />

        <Button
            android:id="@+id/btnSend"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:gravity="center_horizontal"
            android:text="SEND" />
    </LinearLayout>

</LinearLayout>

Please give some idea or correct me ,Thanks in Advance.

[Ulf Dittmer]

Make sure you're not running into this problem: Don't println to a Socket (no, it's not Mac-specific). Using println and readLine would trigger it.

[NeelNisha Singh]

Hi Ulf,
Thanks for your reply,I'm not getting what exactly I need to do,I'm new to android technology,

Problem is server sent data or message i'm getting into
in = new BufferedReader(new InputStreamReader(socket.getInputStream()));



Have tried to set received data like this


@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);

StringBuilder sb = new StringBuilder();

for (int i = 0; i < values.length; i++) {
sb.append(values[i]);

}

txtRecMsg.setText(sb);
sb = null;
}

But txtRecMsg is still blank
Please Help

[Ulf Dittmer]

A sufficient solution would be not to use Readers and Writers with sockets.

There could be other problems, though - I have not looked through the entire code.

[NeelNisha Singh]

Thanks for the reply

I have tried if I'm saving content in some text file and then if sending to android application client app,then it received content/data and shows also in txtRecv,
But,why not in normal case its showing data

[Ulf Dittmer]

In that case, start by investigating what is different between both scenarios.

[NeelNisha Singh]

I have tried alot from yesterday and thought may be data was not trim so used

serverMessage = "DataRecvd"+in.readLine().trim();

but still while receiving at android client inside onprogressupdate method not getting data inside txtRecv

@Override
		protected void onProgressUpdate(String... values) {
			super.onProgressUpdate(values);

			StringBuilder sb = new StringBuilder();

			for (int i = 0; i < values.length; i++) {
				sb.append(values[i]);
				

			}
			
			Toast.makeText(getApplicationContext(),
					"1:onprogressupdate dataRecvd from server;" + sb.toString(),
					Toast.LENGTH_LONG).show();
			
			Toast.makeText(getApplicationContext(),
					"2:onprogressupdate dataRecvd from server;" + values[0].toString().trim(),
					Toast.LENGTH_LONG).show();
			
			Log.d("3 received msg onprogressupdate of stringBuilder", values[0]);
//			txtRecMsg.setText(sb);
			Log.d("4 received msg onprogressupdate", values[0]);
			connections.add(values[0].toString().trim());
			adapter.notifyDataSetChanged();
			
			txtRecMsg.setText(values[0].toString().trim());

Please help