If the text field is empty, the Android button is disabled

Can someone tell me how to disable buttons in Android unless all three EditText fields are filled? I don't know where to include the conditional statement here and how to put it in the context of the button listener

This is my main activity code

package com.amritayalur.mypowerschool;



import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.method.ScrollingMovementMethod;
import android.view.Gravity;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;



public class MyPowerSchoolActivity extends Activity {
Button buttonSubmit;
TextView textViewTitle;
TextView textViewDesc;
EditText editTextURL, editTextUser, editTextPass;

String url = "";
 String str;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);


    buttonSubmit = (Button) findViewById(R.id.buttonSubmit);
    textViewTitle = (TextView) findViewById(R.id.textViewTitle);
    textViewDesc = (TextView) findViewById(R.id.textViewDesc);

    editTextURL = (EditText) findViewById(R.id.editTextURL);
    editTextUser = (EditText) findViewById(R.id.editTextUser);
    editTextPass = (EditText) findViewById(R.id.editTextPass);
    //Start TextView
    textViewTitle.setText("MyPowerSchool");


    //button listener
    buttonSubmit.setOnClickListener(new View.OnClickListener() {


        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            Intent i = new Intent( MyPowerSchoolActivity.this, creds.class);    
            i.putExtra("pschoolurl", editTextURL.getText().toString());
            i.putExtra("pschooluser", editTextUser.getText().toString());
            i.putExtra("pschoolpass", editTextPass.getText().toString());
            // get the text here
            final int result = 1;
            startActivityForResult(i, result); 

        };




    });




}       
}

resolvent:

It's very simple. Just update your onclick () method with the following code,

    @Override
    public void onClick(View v) 
    {
        if (  ( !editTextURL.getText().toString().equals("")) && ( !editTextUser.getText().toString().equals("")) && ( !editTextPass.getText().toString().equals("") ) ) 
        {
             // TODO Auto-generated method stub
            Intent i = new Intent( MyPowerSchoolActivity.this, creds.class);    
            i.putExtra("pschoolurl", editTextURL.getText().toString());
            i.putExtra("pschooluser", editTextUser.getText().toString());
            i.putExtra("pschoolpass", editTextPass.getText().toString());
           // get the text here
           final int result = 1;
           startActivityForResult(i, result); 
        }
    };

The above if condition does not disable the button, but is allowed only if all EditText is not empty