Android Application to understand Activity - Intent

Question -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

---

Step 1: Create New Project in eclipse 
Step 2: Edit main activity layout xml file.

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:stretchColumns="1"
     >
 <TableRow
        android:id="@+id/tableRow0"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
<TextView android:text="Login Form" android:textSize="30dp"/>
    </TableRow>
    <TableRow
        android:id="@+id/tableRow1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
<TextView android:text="UserName : " android:textSize="20dp"/>
<EditText android:id="@+id/etUname"/>
    </TableRow>
<TableRow
        android:id="@+id/tableRow2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
<TextView android:text="PassWord : " android:textSize="20dp"/>
<EditText android:id="@+id/etPwd"/>
    </TableRow>
    <Button
        android:id="@+id/btnLogin"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Login" />
</TableLayout>

Step 3: Add new layout xml file sucess.xml in res/layout folder.

<?xml version="1.0" encoding="utf-8"?>

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="match_parent"

    android:layout_height="match_parent" >

    <TableRow

        android:id="@+id/tableRow1"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" >

        <TextView android:text="Login Sucessfull" android:textSize="30dp"/>

    </TableRow>

    <TableRow

        android:id="@+id/tableRow2"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" >

        <TextView android:text="WellCome :" android:textSize="25dp"/>

        <TextView android:text="" android:id="@+id/tvUser" android:textSize="25dp"/>

    </TableRow>

</TableLayout>

Step 4: Edit Main Activity Java File from src/package/MainActivity.java

package myLab.Pack;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
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{
    /** Called when the activity is first created. */
EditText uname;
EditText pwd;
Button login;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
     
        uname = (EditText)findViewById(R.id.etUname);
        pwd = (EditText)findViewById(R.id.etPwd);
        login = (Button)findViewById(R.id.btnLogin);
 
        login.setOnClickListener(this);
    }
    public void onClick(View v)
{
String un = uname.getText().toString();
String pd = pwd.getText().toString();
try
{
if(un.equalsIgnoreCase("sahin") && pd.equalsIgnoreCase("raj"))
{
Intent i = new Intent(this,Sucess.class);
i.putExtra("user", un);
startActivity(i);
}
else
{
Toast.makeText(this,"Usernae & Passward Mismatch",Toast.LENGTH_LONG).show();
}

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

}

     
    }
   

Step 5: Add new Java file in src/package/sucess.java

package myLab.Pack;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class Sucess extends Activity
{

TextView tv;
@Override
protected void onCreate(Bundle s)
{
// TODO Auto-generated method stub
super.onCreate(s);
setContentView(R.layout.sucess);
Intent i = getIntent();
String uname = i.getStringExtra("user");
tv = (TextView)findViewById(R.id.tvUser);
tv.setText(""+uname);

}

}

---