public void onClick(View v) { // error

[Ethan Bauer]

My problem is fully described:
http://stackoverflow.com/questions/6002756/setcontentviewr-layout-main-error

package com.elfapp;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class MainActivity extends Activity implements OnClickListener {

	private Button btn_Login;
	private EditText et_UserName;

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

		btn_Login = (Button) findViewById(R.id.button_login);
		btn_Login.setOnClickListener(this);

		et_UserName = (EditText) findViewById(R.id.editText_userName);
	}
    
    public void onClick(View v) {
		if (v.equals(btn_Login)) {
				// skriver ut en toast när man klickar på knappen
			Toast.makeText(MainActivity.this, "Ansluter till server...", Toast.LENGTH_SHORT).show();
			
				// används i debuggern för att påvisa att programmet exekverat hit
			Log.v("ThisApp", "onClick Successful");
			
				// TODO skickar det som står i et_UserName till controller (genom TCP/IP), som ska kolla om användaren finns
			// send et_UserName.getText().toString() to controller
			
				// if(username exists)
			Intent intent = new Intent(this, RoomActivity.class);
			this.startActivity(intent);
		}
	}

}

The Problems tab show me 0 errors but 38 warnings, the app crashes when I click on the button.

[Dave MacLean]

It's difficult to troubleshoot this without seeing the stack trace of the error. I'm also suspicious because if the setContentView() method was the problem, you wouldn't have a button to click because the app would have already crashed before you got that far (I'm referring to your post at stackoverflow.com). One thing I see that is not good is how you check which button is clicked. The usual thing that developers do is something like this:

if( v.getId() == R.id.button_login )

or

switch( v.getId() ) {
case R.id.button_login:

- dave