Exercise : 4
Create and Login application as above . On successful login , open browser with any URL.
Screen Shot:

XML :
main.xml :

JAVA :
FourthActivity.java :

package kmn.Fourth;

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;

public class FourthActivity extends Activity implements OnClickListener,TextWatcher
{
    /** @author Y@@D */
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        EditText username = (EditText)findViewById(R.id.txtusername);
        EditText password = (EditText)findViewById(R.id.txtpassword);
        username.addTextChangedListener(this);
        password.addTextChangedListener(this);
        Button login = (Button)findViewById(R.id.btnlogin);
        login.setOnClickListener(this);
    }
    public void onClick(View v)
    {
     Intent i= new Intent("android.intent.action.VIEW");
  i.setData(Uri.parse("http://www.kevalnagaria.blogspot.com"));
  startActivity(i);
    }
    public void afterTextChanged(Editable s)
    {
     EditText e = (EditText)findViewById(R.id.txtusername);
     EditText p = (EditText)findViewById(R.id.txtpassword);
     Button b = (Button)findViewById(R.id.btnlogin);
     if(e.getText().toString().equals("keval") && p.getText().toString().equals("nagaria"))  
     {
      b.setEnabled(true);
     }
     else
     {
      b.setEnabled(false);
     }
    }
 public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
   int arg3) {
  // TODO Auto-generated method stub
  
 }
 public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
  // TODO Auto-generated method stub
  
 }
}