Mr. Bipin S. Rupadiya

package bsr.e2;

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

public class E2Activity extends Activity {
    /** @author Bipin S Rupadiya , www.gtu-android.blogspot.com
     *
     *  2) To understand Activity, Intent
     *   a. Create sample application with login module.(Check username and password)
     *   b. On successful login, go to next screen. And on failing login, alert user using Toast.
     *   c. Also pass username to next screen.
     **/
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
             
        //create an intent
        final Intent intent=new Intent(this,Screen2.class);
     

        //login event
        final Button btnLogin = (Button)findViewById(R.id.cmdLogin);
        btnLogin.setOnClickListener(new Button.OnClickListener()
        {
        @Override
        public void onClick(View v)
        {
        EditText fldu=(EditText)findViewById(R.id.txtusr);
        EditText fldp=(EditText)findViewById(R.id.txtPwd);
        String un= fldu.getText().toString();
       
        if((fldu.getText().toString().equals("bipin"))&&(fldp.getText().toString().equals("rupadiya")))
        {  
        intent.putExtra("uname", fldu.getText().toString());
        startActivity(intent);
        }
        else
        {
        Toast.makeText(E2Activity.this, "sorry  ".concat(un).toString().concat(" you are unauthenticated user!  "), Toast.LENGTH_LONG).show();
        }
        }      
        });
        //clear event
       final Button btnClear = (Button)findViewById(R.id.cmdClear);
       btnClear.setOnClickListener(new Button.OnClickListener()
        {
        @Override
        public void onClick(View v)
        {
        EditText fldu=(EditText)findViewById(R.id.txtusr);
        EditText fldp=(EditText)findViewById(R.id.txtPwd);
        fldu.setText("");
        fldp.setText("");        
        }      
        });

    }
 }

package bsr.e2;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;
/** @author Bipin S Rupadiya , www.gtu-android.blogspot.com
 **/
public class Screen2 extends Activity
{
public void onCreate(Bundle savedInstanceState)
{
        super.onCreate(savedInstanceState);
     
        Intent intent=getIntent();
        String uname=intent.getStringExtra("uname");    
        TextView tv=new TextView(this);
        Button btnBack = new Button(this);
     
        btnBack.setText("<<Back");
        tv.setText("Welcome "+uname+" !");

        tv.setTextColor(Color.rgb(255, 255, 255));
         
        tv.setTextSize(25);
     
        LinearLayout ll = new LinearLayout(this);
     
        ll.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
        ll.setOrientation(LinearLayout.VERTICAL);
        ll.addView(tv);
        ll.addView(btnBack);
     
        setContentView(ll);
     
        //back event
        btnBack.setOnClickListener(new Button.OnClickListener()
        {
        @Override
        public void onClick(View v)
        {
        setContentView(R.layout.main);
        }      
        });
            
}
}