I am fairly new to Android, i want to write a telnet client app for my Android. I have written the code using Apache commons library for telnet. Now i am able to connect to telnet server (for that i have used Asyctask concept) and able to read login banner after a long time i don't know what is causing that. I have modified the example given in Apache commons to work with my android code.I have two java codes in my "src" folder (MainActivity.java and TelnetClientExample.java). First, i want to get the login prompt and then i want user to interact with it please help, Thanks in advance :)
I am posting my screen capture of what i am getting.
MainActivity.java
package com.example.telnetapp;
import java.io.BufferedInputStream;
import java.io.InputStream;
import java.io.PrintWriter;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class MainActivity extends Activity{
public static int port_int_address;
private EditText server,port;
private Button connect;
public static String ip,port_address;
public PrintWriter out;
public static TextView textResponse;
static String response;
public InputStream instr;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
server = (EditText)findViewById(R.id.edittext1);
port = (EditText)findViewById(R.id.edittext2);
connect = (Button)findViewById(R.id.connect);
textResponse = (TextView)findViewById(R.id.response);
connect.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
ip = server.getText().toString();
port_address = port.getText().toString();
port_int_address = Integer.parseInt(port_address);
try{
MyClientTask task = new MyClientTask(ip, port_int_address);
task.execute();
}
catch(Exception e){Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_LONG).show();}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public class MyClientTask extends AsyncTask<Void, Void, Void> {
String dstAddress;
int dstPort;
TelnetClientExample job;
MyClientTask(String inetAddress, int port){
dstAddress = inetAddress;
dstPort = port;
}
#Override
protected Void doInBackground(Void... arg0) {
try {
job = new TelnetClientExample();
job.backgroundjob();
}
catch (Exception e)
{
Toast.makeText(getApplicationContext(), e.toString(), Toast.LENGTH_SHORT).show();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
try {
instr = TelnetClientExample.tc.getInputStream();
byte[] buff = new byte[1024];
int ret_read = 0;
do
{
ret_read = instr.read(buff);
if(ret_read > 0)
{
MainActivity.response += new String(buff, 0, ret_read);
}
}
while (ret_read >= 0);
}
catch (Exception e) {
MainActivity.response += e.toString();
MainActivity.response += "From reading from telnet server ! \n";
}
textResponse.setText(response);
super.onPostExecute(result);
}
}
}
TelnetClientExample.java
package com.example.telnetapp;
import java.io.IOException;
import java.io.InputStream;
import org.apache.commons.net.telnet.TelnetClient;
public class TelnetClientExample {
public String remoteip = MainActivity.ip;
public int remoteport= MainActivity.port_int_address;
public static TelnetClient tc = null;
public void backgroundjob() throws IOException {
tc = new TelnetClient();
try {
tc.connect(remoteip, remoteport);
}
catch (Exception e) {
}
}
public void close_con(){
try {
tc.disconnect();
}
catch (Exception e) {
MainActivity.response += e.toString();
MainActivity.response += "From reading from disconnecting telnet server ! \n";
}
}
}
The problem is in this code snippet . please look into this and help me to get an interactive session.
protected void onPostExecute(Void result) {
try {
instr = TelnetClientExample.tc.getInputStream();
byte[] buff = new byte[1024];
int ret_read = 0;
do
{
ret_read = instr.read(buff);
if(ret_read > 0)
{
MainActivity.response += new String(buff, 0, ret_read);
}
}
while (ret_read >= 0);
}
catch (Exception e) {
MainActivity.response += e.toString();
MainActivity.response += "From reading from telnet server ! \n";
}
textResponse.setText(response);
super.onPostExecute(result);
}
The problem i am getting -
Related
So another one from the same code with another problem.
here is the code
package com.test.aplikasirevisi;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;
import android.app.Activity;
import android.app.ProgressDialog;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothSocket;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.EditText;
import android.widget.ScrollView;
import android.widget.TextView;
import android.widget.Toast;
import static com.test.aplikasirevisi.Information.Highest;
import static com.test.aplikasirevisi.Information.Lowest;
import static com.test.aplikasirevisi.Information.mypreference;
public class MonitoringScreen extends Activity {
private static final String TAG = "BlueTest5-MainActivity";
private int mMaxChars = 50000;//Default
private UUID mDeviceUUID;
private BluetoothSocket mBTSocket;
private ReadInput mReadThread = null;
TextView highest;
TextView lowest;
private boolean mIsUserInitiatedDisconnect = false;
private TextView mTxtReceive;
private Button mBtnClearInput;
private Button mBtnGetBPM;
private ScrollView scrollView;
private CheckBox chkScroll;
private CheckBox chkReceiveText;
private boolean mIsBluetoothConnected = false;
private BluetoothDevice mDevice;
private ProgressDialog progressDialog;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_monitoring_screen);
ActivityHelper.initialize(this);
Intent intent = getIntent();
Bundle b = intent.getExtras();
mDevice = b.getParcelable(MainActivity.DEVICE_EXTRA);
mDeviceUUID = UUID.fromString(b.getString(MainActivity.DEVICE_UUID));
mMaxChars = b.getInt(MainActivity.BUFFER_SIZE);
Log.d(TAG, "Ready");
mTxtReceive = (TextView) findViewById(R.id.txtReceive);
chkScroll = (CheckBox) findViewById(R.id.chkScroll);
chkReceiveText = (CheckBox) findViewById(R.id.chkReceiveText);
scrollView = (ScrollView) findViewById(R.id.viewScroll);
mBtnClearInput = (Button) findViewById(R.id.btnClearInput);
mBtnGetBPM = (Button) findViewById(R.id.mBtnGetBPM);
mTxtReceive.setMovementMethod(new ScrollingMovementMethod());
highest = (TextView) findViewById(R.id.etHighest);
lowest = (TextView) findViewById(R.id.etLowest);
SharedPreferences sharedpreferences = getSharedPreferences(mypreference,
Context.MODE_PRIVATE);
if (sharedpreferences.contains(Highest)) {
highest.setText(sharedpreferences.getString(Highest, ""));
}
if (sharedpreferences.contains(Lowest)) {
lowest.setText(sharedpreferences.getString(Lowest, ""));
}
mBtnClearInput.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
mTxtReceive.setText("");
}
});
}
private class ReadInput implements Runnable{
private boolean bStop = false;
private Thread t;
public ReadInput() {
t = new Thread(this, "Input Thread");
t.start();
}
public boolean isRunning() {
return t.isAlive();
}
#Override
public void run() {
InputStream inputStream;
try {
inputStream = mBTSocket.getInputStream();
while (!bStop) {
byte[] buffer = new byte[256];
if (inputStream.available() > 0) {
inputStream.read(buffer);
int i;
/*
* This is needed because new String(buffer) is taking the entire buffer i.e. 256 chars on Android 2.3.4 http://stackoverflow.com/a/8843462/1287554
*/
for (i = 0; i < buffer.length && buffer[i] != 0; i++) {
}
final String strInput = new String(buffer, 0, i);
String getHi = null;
SharedPreferences sharedpreferences = getSharedPreferences(mypreference,
Context.MODE_PRIVATE);
if (sharedpreferences.contains(Highest)) {
highest.setText(sharedpreferences.getString(Highest, ""));
getHi=highest.getText().toString();
}
if (sharedpreferences.contains(Lowest)) {
lowest.setText(sharedpreferences.getString(Lowest, ""));
}
int hi = Integer.parseInt(getHi);
/*
* If checked then receive text, better design would probably be to stop thread if unchecked and free resources, but this is a quick fix
*/
if (chkReceiveText.isChecked()) {
mTxtReceive.post(new Runnable() {
#Override
public void run() {
mTxtReceive.append(strInput);
System.out.println(strInput);
if(data < hi){
Log.d(TAG, "succes");
}
int txtLength = mTxtReceive.getEditableText().length();
if(txtLength > mMaxChars){
mTxtReceive.getEditableText().delete(0, txtLength - mMaxChars);
Log.d(TAG, "text longer than allowed:" + mTxtReceive.getEditableText().delete(0, txtLength - mMaxChars));
}
if (chkScroll.isChecked()) { // Scroll only if this is checked
scrollView.post(new Runnable() { // Snippet from http://stackoverflow.com/a/4612082/1287554
#Override
public void run() {
scrollView.fullScroll(View.FOCUS_DOWN);
}
});
}
}
});
}
}
Thread.sleep(500);
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
public void stop() {
bStop = true;
}
}
private class DisConnectBT extends AsyncTask<Void, Void, Void> {
#Override
protected void onPreExecute() {
}
#Override
protected Void doInBackground(Void... params) {
if (mReadThread != null) {
mReadThread.stop();
while (mReadThread.isRunning())
; // Wait until it stops
mReadThread = null;
}
try {
mBTSocket.close();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
mIsBluetoothConnected = false;
if (mIsUserInitiatedDisconnect) {
finish();
}
}
}
private void msg(String s) {
Toast.makeText(getApplicationContext(), s, Toast.LENGTH_SHORT).show();
}
#Override
protected void onPause() {
if (mBTSocket != null && mIsBluetoothConnected) {
new DisConnectBT().execute();
}
Log.d(TAG, "Paused");
super.onPause();
}
#Override
protected void onResume() {
if (mBTSocket == null || !mIsBluetoothConnected) {
new ConnectBT().execute();
}
Log.d(TAG, "Resumed");
super.onResume();
}
#Override
protected void onStop() {
Log.d(TAG, "Stopped");
super.onStop();
}
#Override
protected void onSaveInstanceState(Bundle outState) {
// TODO Auto-generated method stub
super.onSaveInstanceState(outState);
}
private class ConnectBT extends AsyncTask<Void, Void, Void> {
private boolean mConnectSuccessful = true;
#Override
protected void onPreExecute() {
progressDialog = ProgressDialog.show(MonitoringScreen.this, "Hold on", "Connecting");// http://stackoverflow.com/a/11130220/1287554
}
#Override
protected Void doInBackground(Void... devices) {
try {
if (mBTSocket == null || !mIsBluetoothConnected) {
mBTSocket = mDevice.createInsecureRfcommSocketToServiceRecord(mDeviceUUID);
BluetoothAdapter.getDefaultAdapter().cancelDiscovery();
mBTSocket.connect();
}
} catch (IOException e) {
// Unable to connect to device
e.printStackTrace();
mConnectSuccessful = false;
}
return null;
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (!mConnectSuccessful) {
Toast.makeText(getApplicationContext(), "Could not connect to device. Is it a Serial device? Also check if the UUID is correct in the settings", Toast.LENGTH_LONG).show();
finish();
} else {
msg("Connected to device");
mIsBluetoothConnected = true;
mReadThread = new ReadInput(); // Kick off input reader
}
progressDialog.dismiss();
}
}
}
i want to change the String to int from this part:
final String strInput = new String(buffer, 0, i);
so i can use it on this part :
if(data < hi){
Log.d(TAG, "succes");
}
i tried to use
int data = Integer.parseInt(strInput);
but well of course it span error because its string buffer and only the first one is changed
so how do i solve this prob?if any one can help
I already tried using arraylist but still error
Here is the error code :
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.test.aplikasirevisi, PID: 21905
java.lang.NumberFormatException: For input string: "40
"
at java.lang.Integer.parseInt(Integer.java:615)
at java.lang.Integer.parseInt(Integer.java:650)
at com.test.aplikasirevisi.MonitoringScreen$ReadInput$1.run(MonitoringScreen.java:152)
at android.os.Handler.handleCallback(Handler.java:873)
at android.os.Handler.dispatchMessage(Handler.java:99)
at android.os.Looper.loop(Looper.java:201)
at android.app.ActivityThread.main(ActivityThread.java:6810)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:873)
I/Process: Sending signal. PID: 21905 SIG: 9
The error message is telling you what is wrong. Your input appears to be "40 and " is not a numeric character. You need make sure your inputted strings are numeric OR you need to extract the numeric component from the string BEFORE attempting to convert it into an integer. You could try new String(buffer, 1, i) if the character at index 0 is always the double quote character.
UPDATE:
Based on your last comment posted here, you need to initialize your strInput as follows (This is an example):
byte[] bytes = new byte[5];
bytes[0] = 49; // this is the ASCII value of the number "1"
bytes[1] = '\u0000'; // These are null characters
bytes[2] = '\u0000';
bytes[3] = '\u0000';
bytes[4] = '\u0000';
String temp = new String(bytes); // convert the byte array to String
String str = temp.substring(0, temp.indexOf('\u0000')); // parse the numeric contents
System.out.println(str); // You should see "1" printed out
int number = Integer.parseInt(str); // Because I parsed the numeric contents, it is safe to convert the String to a number.
import android.annotation.TargetApi;
import android.bluetooth.BluetoothAdapter;
import android.bluetooth.BluetoothDevice;
import android.bluetooth.BluetoothServerSocket;
import android.bluetooth.BluetoothSocket;
import android.content.Intent;
import android.content.res.Configuration;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Set;
import java.util.UUID;
#TargetApi(18)
public class MainActivity extends AppCompatActivity{
`int b = 0;
BluetoothAdapter BA = BluetoothAdapter.getDefaultAdapter();
BluetoothDevice device;
BluetoothSocket BS;
BluetoothServerSocket server;
UUID uuid = UUID.fromString("f63b93f5-56e0-47bb-8972-996e34cfb9a8");`
`#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);`
`Intent i = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivity(i);`
`Accept accept = new Accept();
accept.start();`
Set<BluetoothDevice> devices = BA.getBondedDevices();
for(BluetoothDevice bt : devices) {
try {
if (bt.getName().equals("Overlord")) {
device = BA.getRemoteDevice(bt.getAddress());
BS = device.createRfcommSocketToServiceRecord(uuid);
} else if (bt.getName().equals("Huawei Y5")) {
device = BA.getRemoteDevice(bt.getAddress());
BS = device.createRfcommSocketToServiceRecord(uuid);
}
}catch(IOException IOE){}
}
}
public interface MessageContents{
int MSG_MESSAGE = 0;
}
Handler handler = new Handler(){
public void handleMessage(Message msg) {
TextView tx = (TextView)findViewById(R.id.textView2);
switch(msg.what){
case MessageContents.MSG_MESSAGE:
byte[] readBuf = (byte[]) msg.obj;
// construct a string from the valid bytes in the buffer
String readMessage = new String(readBuf, 0, msg.arg1);
Log.d("TAG", readMessage);
tx.setText(readMessage);
break;
default:
tx.setText("No text");
}
}
};
class Connect extends Thread{
public void run(){
try {
try {
BS.connect();
Log.d("LOG", " e");
Log.d("LOG", "r" + BS.isConnected());
DataTransfer dataTransfer = new DataTransfer();
dataTransfer.start();
}catch(NullPointerException e){
Log.d("LOG", " meezaan");
}
}catch(IOException e){
Log.d("LOG", "t");
}
}
}
class Accept extends Thread{
public void run() {
try {
while (true) {
server = BA.listenUsingRfcommWithServiceRecord("Secure Connection", uuid);
server.accept();
Log.d("LOG", "accept");
}
}catch(IOException E) {
}
}
}
class DataTransfer extends Thread{
#Override
public void run() {
int d = 1;
InputStream receive = null;
Log.d("LOG", "On");
int numBytes;
byte[] buffer = new byte[1024];
try {
receive = BS.getInputStream();
Log.d("LOG", "pn");
while (BS.isConnected()) {
try {
if (d <= 5) {
Log.d("LOG", "did");
++d;
}
numBytes = receive.read(buffer);
handler.obtainMessage(MessageContents.MSG_MESSAGE, numBytes, -1, buffer).sendToTarget();
} catch (NullPointerException e) {
Log.d("LOG", "error read(null)");
}
}
Log.d("LOG", "pnA");
} catch (IOException IOE) {
Log.d("LOG", "error read(IOE)");
}
}
}
public void onOne(View view){
write("1".getBytes());
}
public void onClick(View view){
Button b1 = (Button) findViewById(R.id.button);
EditText pin = (EditText) findViewById(R.id.editText);
pin.setRawInputType(Configuration.KEYBOARD_QWERTY);
pin.setVisibility(View.VISIBLE);
b1.setVisibility(View.VISIBLE);
}
public void pin (View view) {
Button b1 = (Button)findViewById(R.id.button);
EditText pin = (EditText)findViewById(R.id.editText);
String pin1 = pin.getText().toString();
if (pin1.equals("")) {
Connect connect = new Connect();
connect.run();
pin.setVisibility(View.INVISIBLE);
b1.setVisibility(View.INVISIBLE);
} else {
Toast.makeText(getApplicationContext(), "Wrong Pin!"+pin1, Toast.LENGTH_SHORT).show();
pin.setVisibility(View.INVISIBLE);
b1.setVisibility(View.INVISIBLE);
}
}
public void onTwo(View v){
Toast.makeText(getApplicationContext(), "" + handler.hasMessages(MessageContents.MSG_MESSAGE) + " " + BS.isConnected(), Toast.LENGTH_SHORT).show();
}
public void write(byte[] Byte){
try {
OutputStream transfer = BS.getOutputStream();
try {
transfer.write(Byte);
}catch(NullPointerException e){
Log.d("LOG", "error write(null) " + BS.isConnected());}
}catch (IOException IOE){ Log.d("LOG", "b");
Log.d("LOG", "error write(IOE) " + BS.isConnected());}
}
}`
Hi, this is my code. After writing Bytes[] I don't receive anything on second device. When I remove 'numBytes = receive.read(buffer)' handler would work or display
'no text'
I think receive.read(buffer) waits for an input which means write is a problem or receive.read(buffer) is the problem. Please ignore names, logs with random letters in or device names or unnecessary imports or variables. Thank You :) Sorry I did not have time to indent everything. If you are viewing please put something like don't know.Thank you.
i have my code that sucessfuly send my client message to server.. can anyone help pls ? i'm new in socket programming. i want to establish a server that sends the message of my android client to other android client... here is my code
CLIENT ANDROID :
package com.example.websocketclient;
import java.io.BufferedWriter;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import android.os.AsyncTask;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
public class Chatroom extends Activity {
public static String msgToServer = null;
TextView uname;
EditText in;
Button snd;
TextView out;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chatroom);
uname = (TextView) findViewById(R.id.textViewmynam);
in = (EditText) findViewById(R.id.editTextInput);
snd = (Button) findViewById(R.id.buttonSend);
out = (TextView) findViewById(R.id.textViewOutput);
Bundle bundle = getIntent().getExtras();
String urname = bundle.getString("myname");
uname.setText(urname);
MyClientTask clientTask = new MyClientTask();
clientTask.execute();
}
public class MyClientTask extends AsyncTask<Void, Void, Void> {
#Override
protected Void doInBackground(Void... arg0) {
connect();
return null;
}
}
public void connect() {
Socket sock;
int[] allports = {1111,1919,2020};
int portnum;
for(int i=1;i<allports.length;i++) {
try {
portnum = allports[i];
boolean socketno = Middleware.available(portnum);
String ad = "192.168.149.1";
if(socketno = true) {
sock = new Socket(ad,portnum);
while(socketno) {
sendmsg(sock);
}//while
// sock.close();
}//if
}catch (UnknownHostException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
public void sendmsg (final Socket s) {
snd.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View arg0) {
//boolean listening = true;
String inmsg = ""+in.getText().toString();
String response = "";
msgToServer = inmsg;
//out.append("you:"+msgToServer+"\n");
try {
DataOutputStream outToServer = new DataOutputStream(s.getOutputStream());
DataInputStream inToServer = new DataInputStream(s.getInputStream());
if(outToServer != null){
outToServer.writeBytes(msgToServer+"\n");
}
}
catch (Exception e) {
}
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.chatroom, menu);
return true;
}
}
Here is my PC Server side :
package Server;
import java.net.*;
import java.io.*;
import java.util.Scanner;
import java.net.ServerSocket;
import java.net.Socket;
import java.sql.*;
public class SocketServer extends Thread {
final static int _portNumber = 1919; //Arbitrary port number
public static void main(String[] args)
{
try {
new SocketServer().startServer();
} catch (Exception e) {
System.out.println("I/O failure: " + e.getMessage());
}
}
public void startServer() throws Exception {
ServerSocket serverSocket = null;
boolean listening = true;
try {
serverSocket = new ServerSocket(_portNumber);
} catch (IOException e) {
System.err.println("Could not listen on port: " + _portNumber);
System.exit(-1);
}
while (listening) {
System.out.println("Huwat huwat kang client..!");
handleClientRequest(serverSocket);
}
serverSocket.close();
}
private void handleClientRequest(ServerSocket serverSocket) {
try {
new Thread(new ConnectionRequestHandler(serverSocket.accept())).start();
} catch (IOException e) {
e.printStackTrace();
}
}
/**
* Handles client connection requests.
*/
public class ConnectionRequestHandler implements Runnable{
private Socket _socket;
private PrintWriter _out;
private BufferedReader _in;
public ConnectionRequestHandler(Socket socket) {
_socket = socket;
}
public void run() {
String info;
int maxid;
System.out.println("Client connected to socket: " + _socket.toString());
info = _socket.toString();
//incrementing the msg_id
try {
BufferedWriter out = new BufferedWriter(new OutputStreamWriter(
_socket.getOutputStream()));
_in = new BufferedReader(new InputStreamReader(_socket.getInputStream()));
String inputLine;
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost/finalclient","root","");
PreparedStatement st = con.prepareStatement("select *from msgs order by msg_id desc");
ResultSet r1 = st.executeQuery();
r1.first(); // or r1.next()
maxid = r1.getInt("msg_id") + 1;
while ((inputLine = _in.readLine()) != null) {
System.out.println("Message from Client: "+inputLine);
out.write(inputLine);
try {
PreparedStatement st1=con.prepareStatement("insert into msgs values(?,?,?)");
st1.setInt(1,maxid);
st1.setString(2,info);
st1.setString(3,inputLine);
int count = st1.executeUpdate ();
System.out.println (count + " rows were inserted to Database");
}
catch (Exception e) {
System.out.println("Failed to Insert from DB"+e);
}
}
}
catch (Exception e) {
System.out.println("Failed to Select from DB"+e);
}
}
}
}
Could you help me figure out how to implement Threads to this, so it won't freeze while it waits for the answer from the server?
I've tried for 5 hours or so, i simple can't find a way to use it in a thread, and then return it to set the text with tv.setText();
package zee.rhs.dk;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.net.Socket;
import java.net.UnknownHostException;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class AndroidClientActivity extends Activity {
private String ip = "90.184.254.246";
private int port = 8081;
private String line;
private TextView tv;
private Button btn;
private Socket socket;
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
tv = (TextView) findViewById(R.id.tv);
btn = (Button) findViewById(R.id.btn);
btn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
BufferedReader in = null;
PrintWriter out = null;
try {
socket = new Socket(ip, port);
out = new PrintWriter(socket.getOutputStream(), true);
out.println("update");
in = new BufferedReader(new InputStreamReader(socket
.getInputStream()));
while ((line = in.readLine()) == null) {
}
tv.setText(line);
} catch (UnknownHostException e) {
Toast.makeText(AndroidClientActivity.this,
"Can't reach ip: " + ip, Toast.LENGTH_LONG).show();
e.printStackTrace();
} catch (IOException e) {
Toast.makeText(AndroidClientActivity.this,
"Accept failed at port: " + port, Toast.LENGTH_LONG)
.show();
e.printStackTrace();
} finally {
out.close();
}
}
});
}
}
AsyncTask is what you're looking for. From the help page:
private class DownloadFilesTask extends AsyncTask<URL, Integer, Long> {
protected Long doInBackground(URL... urls) {
int count = urls.length;
long totalSize = 0;
for (int i = 0; i < count; i++) {
totalSize += Downloader.downloadFile(urls[i]);
publishProgress((int) ((i / (float) count) * 100));
}
return totalSize;
}
protected void onProgressUpdate(Integer... progress) {
setProgressPercent(progress[0]);
}
protected void onPostExecute(Long result) {
showDialog("Downloaded " + result + " bytes");
}
}
Remember that doInBackground runs in a separate thread, and onPostExecute runs in the UI thread after doInBackground completes.
Put your code, that is responsible for request to server into a separate thread:
Thread thread = new Thread() {
#Override
public void run() {
try {
// put your socket operations here
} catch (InterruptedException e) {
// handle exception if you need
}
}
};
thread.start();
I have a working FTP system with android, but I want to be able to track the bytes as they get uploaded, so I can update a progress bar as the upload progresses. Is this possible with Android? Right now, I'm using org.apache.common.net.ftp and the code I'm using is below. Also, I am running this in an AsyncTask.
package com.dronnoc.ftp.complex;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.SocketException;
import org.apache.commons.net.ftp.FTPClient;
import org.apache.commons.net.io.CopyStreamEvent;
import org.apache.commons.net.io.CopyStreamListener;
import org.apache.commons.net.io.Util;
import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.Window;
public class Main extends Activity {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
setContentView(R.layout.main);
String text = "BIGFILE"; //Big file here
InputStream data = new ByteArrayInputStream(text.getBytes());
new ComplexFTPTransfer().execute(data);
}
private class ComplexFTPTransfer extends AsyncTask<InputStream, Long[], Void>
{
private FTPClient ftp = null;
#Override
protected void onPreExecute() {
super.onPreExecute();
try {
ftp = new FTPClient();
ftp.connect("hostname");
} catch (SocketException e) {
this.cancel(true);
} catch (IOException e) {
this.cancel(true);
}
Main.this.setProgressBarIndeterminateVisibility(true);
}
#Override
protected Void doInBackground(InputStream... params) {
if(!this.isCancelled())
{
try
{
if(ftp.login("user", "pass"))
{
ftp.enterLocalPassiveMode();
InputStream item = params[0];
int streamSize = 0;
while(item.read() != -1)
{
streamSize++;
}
InputStream is = new BufferedInputStream(params[0], streamSize);
OutputStream os = ftp.storeFileStream("/test.txt");
Util.copyStream(is, os, streamSize, streamSize, new CopyStreamListener() {
#Override
public void bytesTransferred(long totalBytesTransferred, int bytesTransferred, long streamSize) {
publishProgress(new Long[] {totalBytesTransferred, streamSize});
}
#Override
public void bytesTransferred(CopyStreamEvent event) {
}
});
ftp.completePendingCommand();
}
ftp.logout();
ftp.disconnect();
}
catch (IOException e) {
}
catch (Exception e) {
}
}
return null;
}
#Override
protected void onProgressUpdate(Long[]... values) {
super.onProgressUpdate(values);
Log.d("UPDATE", values[0] + " of " + values[1] + " copied.");
//TODO Put code here
}
#Override
protected void onPostExecute(Void result) {
// TODO Auto-generated method stub
super.onPostExecute(result);
Main.this.setProgressBarIndeterminateVisibility(false);
}
}
}
What I want to know is if I can run a progress bar, updating every few uploaded bytes?
Cheers
This question has an implementation of an InputStream that includes a progress callback. Use that InputStream and call publishProgress from that callback for incremental updates during the file upload.
Download this .jar file
httpmime-4.1.1.jar and commons-net.jar
try {
FTPClient ftpClient = new FTPClient();
ftpClient.connect(InetAddress
.getByName(Your host Url));
ftpClient.login(loginName, password);
System.out.println("status :: " + ftpClient.getStatus());
ftpClient.changeWorkingDirectory(your directory name);
ftpClient.setFileType(FTP.IMAGE_FILE_TYPE);
//Your File path set here
File file = new File("/sdcard/my pictures/image.png");
BufferedInputStream buffIn = new BufferedInputStream(
new FileInputStream(myImageFile));
ftpClient.enterLocalPassiveMode();
ProgressInputStream progressInput = new ProgressInputStream(
buffIn);
boolean result = ftpClient.storeFile(UPLOADFILENAME + ".png",
progressInput);
System.out.println("result is :: " + result);
buffIn.close();
ftpClient.logout();
ftpClient.disconnect();
} catch (Exception e) {
e.printStackTrace();
}
//ProgressInputStream
import java.io.IOException;
import java.io.InputStream;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
public class ProgressInputStream extends InputStream {
/* Key to retrieve progress value from message bundle passed to handler */
public static final String PROGRESS_UPDATE = "progress_update";
private static final int TEN_KILOBYTES = 1024 * 40;
private InputStream inputStream;
//private Handler handler;
private long progress;
private long lastUpdate;
private boolean closed;
public ProgressInputStream(InputStream inputStream) {
this.inputStream = inputStream;
this.progress = 0;
this.lastUpdate = 0;
this.closed = false;
}
#Override
public int read() throws IOException {
int count = inputStream.read();
return incrementCounterAndUpdateDisplay(count);
}
#Override
public int read(byte[] b, int off, int len) throws IOException {
int count = inputStream.read(b, off, len);
return incrementCounterAndUpdateDisplay(count);
}
#Override
public void close() throws IOException {
super.close();
if (closed)
throw new IOException("already closed");
closed = true;
}
private int incrementCounterAndUpdateDisplay(int count) {
if (count < 0)
progress += count;
lastUpdate = maybeUpdateDisplay(progress, lastUpdate);
return count;
}
private long maybeUpdateDisplay(long progress, long lastUpdate) {
if (progress - lastUpdate < TEN_KILOBYTES) {
lastUpdate = progress;
sendLong(PROGRESS_UPDATE, progress);
}
return lastUpdate;
}
public void sendLong(String key, long value) {
Bundle data = new Bundle();
data.putLong(key, value);
Message message = Message.obtain();
message.setData(data);
//handler.sendMessage(message);
}
}
This can be done using Secure FTP Factory library.
You just need to implement an instance of the com.jscape.inet.ftp.FtpListener interface, register the instance with the Ftp class and overload the progress(FtpProgressEvent event) method to capture progress information.
JavaDoc: Overview (secure FTP Factory API)
Download: Java FTP, Java FTPS and Java SFTP Components