Hi,
I'm doing a desktop server application in java with android clients. I'm using sockets to provide the communication.
I have create an instance of tcpClient on MainActivity and I would like to know how could I call the method 'sendMessage' on other activities.
Should I create an instance of tcpClient on all activities?
Thanks
Server class
import java.net.*;
import java.io.*;
public class Server {
public static void main(String[] args) throws IOException{
boolean listening = true;
try (ServerSocket serverSocket = new ServerSocket(4444)){
while(listening){
new ServerThread(serverSocket.accept()).start();
}
} catch (IOException e) {
System.out.println("Could not listen on port: 4444");
System.exit(-1);
}
}
}
ServerThread
import java.net.*;
import java.io.*;
public class ServerThread extends Thread {
private Socket socket = null;
public ServerThread(Socket socket) {
super("ServerThread");
this.socket = socket;
}
public void run() {
try (
PrintWriter out = new PrintWriter(socket.getOutputStream(), true);
BufferedReader in = new BufferedReader(
new InputStreamReader(
socket.getInputStream()));
) {
String inputLine, outputLine;
GameProtocol gp = new GameProtocol();
outputLine = gp.processInput(null);
//System.out.println(outputLine);
//out.println(outputLine);
while ((inputLine = in.readLine()) != null) {
//System.out.println(outputLine);
outputLine = gp.processInput(inputLine);
System.out.println(outputLine);
out.println(outputLine);
if (outputLine.equals("Bye"))
break;
}
socket.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
TcpClient class
import android.util.Log;
import java.io.*;
import java.net.*;
/**
* Created by andrecorreia on 03/06/16.
*/
public class TcpClient {
public static final String SERVER_IP = "10.0.2.2"; // computer IP address
public static final int SERVER_PORT = 4444;
// message to send to the server
private String mServerMessage;
// sends message received notifications
private OnMessageReceived mMessageListener = null;
// while this is true, the server will continue running
private boolean mRun = false;
// used to send messages
private PrintWriter mBufferOut;
// used to read messages from the server
private BufferedReader mBufferIn;
/**
* Constructor of the class. OnMessagedReceived listens for the messages received from server
*/
public TcpClient(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 (mBufferOut != null && !mBufferOut.checkError()) {
mBufferOut.println(message);
mBufferOut.flush();
}
}
/**
* Close the connection and release the members
*/
public void stopClient() {
Log.i("Debug", "stopClient");
// send mesage that we are closing the connection
//sendMessage(Constants.CLOSED_CONNECTION + "Kazy");
mRun = false;
if (mBufferOut != null) {
mBufferOut.flush();
mBufferOut.close();
}
mMessageListener = null;
mBufferIn = null;
mBufferOut = null;
mServerMessage = null;
}
public void run() {
mRun = true;
try {
//here you must put your computer's IP address.
InetAddress serverAddr = InetAddress.getByName(SERVER_IP);
//InetAddress serverAddr = InetAddress.getLocalHost();
Log.e("TCP Client", "C: Connecting...");
//create a socket to make the connection with the server
Socket socket = new Socket("192.168.1.92", SERVER_PORT);
try {
Log.i("Debug", "inside try catch");
//sends the message to the server
mBufferOut = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket.getOutputStream())), true);
//receives the message which the server sends back
mBufferIn = new BufferedReader(new InputStreamReader(socket.getInputStream()));
// send login name
//sendMessage(Constants.LOGIN_NAME + PreferencesManager.getInstance().getUserName());
//sendMessage("Hi");
//in this while the client listens for the messages sent by the server
while (mRun) {
mServerMessage = mBufferIn.readLine();
if (mServerMessage != null && mMessageListener != null) {
//call the method messageReceived from MyActivity class
mMessageListener.messageReceived(mServerMessage);
}
}
Log.e("RESPONSE FROM SERVER", "S: Received Message: '" + mServerMessage + "'");
} 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);
}
}
Main Activity
import android.app.Activity;
import android.content.Intent;
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;
public class MainActivity extends Activity implements OnClickListener {
public static TcpClient tcpClient;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
new ConnectTask().execute("");
// Set up click listeners for all the buttons
View playNowButton = findViewById(R.id.playNow_button);
playNowButton.setOnClickListener(this);
View optionsButton = findViewById(R.id.options_button);
optionsButton.setOnClickListener(this);
View helpButton = findViewById(R.id.help_button);
helpButton.setOnClickListener(this);
View exitButton = findViewById(R.id.exit_button);
exitButton.setOnClickListener(this);
//---------------------------------------------
}
@Override
public void onClick(View v) {
Intent i;
switch (v.getId()){
case R.id.playNow_button:
i = new Intent(this, PlayNowActivity.class);
startActivity(i);
break;
case R.id.options_button:
i = new Intent(this, OptionsActivity.class);
tcpClient.sendMessage("options");
startActivity(i);
break;
case R.id.help_button:
i = new Intent(this, HelpActivity.class);
tcpClient.sendMessage("help");
startActivity(i);
break;
case R.id.exit_button:
finish();
break;
}
}
public class ConnectTask extends AsyncTask<String,String,TcpClient> {
@Override
protected TcpClient doInBackground(String... message) {
//we create a TCPClient object and
tcpClient = new TcpClient(new TcpClient.OnMessageReceived() {
@Override
//here the messageReceived method is implemented
public void messageReceived(String message) {
//this method calls the onProgressUpdate
publishProgress(message);
}
});
tcpClient.run();
return null;
}
@Override
protected void onProgressUpdate(String... values) {
super.onProgressUpdate(values);
/*View view = adapter.getChildView(0, 0, false, null, null);
TextView text = (TextView) view.findViewById(R.id.betChildOdd);
child2.get(0).get(0).put("OLD", text.getText().toString());
child2.get(0).get(0).put(CONVERTED_ODDS, values[0].toString());
child2.get(0).get(0).put("CHANGE", "TRUE");
adapter.notifyDataSetChanged();*/
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
Options Activity
import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import java.io.PrintWriter;
import java.net.Socket;
public class OptionsActivity extends Activity implements OnClickListener{
private PrintWriter printwriter;
private EditText textField;
private String message;
private String pieceSelected;
TextView response;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_options);
textField = (EditText) findViewById(R.id.name_editText);
// Set up click listeners for all the buttons
View saveButton = findViewById(R.id.saveOptions_button);
//saveButton.setOnClickListener(this);
View backOptionsButton = findViewById(R.id.backOptions_button);
backOptionsButton.setOnClickListener(this);
View choosePieceButton = findViewById(R.id.choosePiece_button);
choosePieceButton.setOnClickListener(this);
saveButton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
message = textField.getText().toString(); // get the text message on the text field
message+=";";
message+=pieceSelected;
MainActivity.tcpClient.sendMessage(message);
}
});
}
//@Override
public void onClick(View v) {
if (v.getId() == R.id.backOptions_button) {
finish();
} else if (v.getId() == R.id.saveOptions_button) {
} else if (v.getId() == R.id.choosePiece_button) {
Intent i = new Intent(this, GridViewPiecesActivity.class);
startActivityForResult(i,1);
}
}
public void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == 1) {
if(resultCode == RESULT_OK){
pieceSelected=data.getStringExtra("edittextvalue");
}
}
}
}