CODEWITHSUNDEEP
javaandroid
k-s-b
k-s-b

Reputation: 23

java android programing.. obtain ip address from user

i wrote android code to obtain an IP address from user in EditText, then communicate the mobile with a computer ip which obtained by user in EditText.

this is my code, when I click on button nothing work:

public class MainActivity extends Activity {

Button b;
EditText et;
TextView tv;
private Socket socket;
int PORT = 4003;
String HOST; //HOST = " 192.168.2.1"

private Handler textview_handler_thread;
class ClientThread implements Runnable {

    @Override
    public void run()
    {
        try {
            socket = new Socket(HOST, PORT);
            Message msg = null;
            while(true) {      
                msg = textview_handler_thread.obtainMessage();
                msg.obj = "Process Completed Succesfully";
                textview_handler_thread.sendMessage(msg);
            } 
        }
        catch (Exception e){
            e.printStackTrace();
        } 
    }
}

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    b = (Button) findViewById(R.id.button1);
    et = (EditText) findViewById(R.id.editText1);
    HOST = et.getText().toString();

    new Thread(new ClientThread()).start();

    textview_handler_thread = new Handler() {
        public void handleMessage(Message msg) {
            Object o = msg.obj;

            if (o == null) 
                o = "";

            TextView tv = (TextView)findViewById(R.id.textView1);
            tv.setText(o.toString());
        }
        };

    b.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            try {
                DataOutputStream output_to_server = new DataOutputStream(socket.getOutputStream());
                String client_str = et.getText().toString();
                    output_to_server.writeBytes(client_str);
                    output_to_server.flush();

            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    });

}

The problem in HOST variable it shoul contain IP address from user. At first i wrote HOST = "192.168.2.1"; But now i want the user do that.

NOTE : if i wrote HOST = "192.168.2.1"; it is executed successfully. when I assigned the valu of HOST to edit Text CANT communicate with the computer WHY?

Upvotes: 1

Views: 64

Answers (1)

Ethan F.
Ethan F.

Reputation: 251

That's because you assign the value to HOST at OnCreate. At that time, that text box is still empty yet.

You may want to do it in the OnClick event

String client_str = et.getText().toString();
HOST = Client_str;

At this time, HOST shall contain the IP address the user typed. Also, you shall not start the thread at OnCreate. At that time, HOST has nothing yet.

Upvotes: 1

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