Create login application where you will have to validate EmailID(UserName). Till the username and password is not validated, login button should remain disabled.

Question -3

Create login application where you will have to validate EmailID(UserName). Till the username and password is not validated, login button should remain disable.

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Step 1: Create New Project in Eclipse.
Step 2: Edit Main Layout XML file from res/layout folder

<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:stretchColumns="1" >
 
    <TableRow
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:textSize="30dp"
        android:text="@string/username" />
</TableRow>

<TableRow
   android:layout_width="match_parent"
   android:layout_height="wrap_content" >

    <EditText
        android:id="@+id/uid"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/username" />
</TableRow>

<TableRow
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="30dp"
        android:text="@string/password" />
</TableRow>

<TableRow
    android:layout_width="match_parent"
    android:layout_height="wrap_content" >

    <EditText
        android:id="@+id/pwd"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:hint="@string/password" />
</TableRow>
<TableRow>
    <Button android:text="@string/login" android:id="@+id/btnlogin"  android:enabled="false"/>
</TableRow>
</TableLayout>

Step 3: Edit MainActivity.java file from scr/package/ folder

package com.example.login;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.support.v4.app.NavUtils;
import android.text.Editable;
import android.text.TextWatcher;

public class MainActivity extends Activity implements OnClickListener,TextWatcher
{

Button login;
EditText uname;
EditText pwd;

    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
     
        uname = (EditText)findViewById(R.id.uid);
        pwd = (EditText)findViewById(R.id.pwd);
        login = (Button)findViewById(R.id.btnlogin);      
     
        login.setOnClickListener(this);
        uname.addTextChangedListener(this);
        pwd.addTextChangedListener(this);
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }

@Override
public void onClick(View v)
{
Toast.makeText(this,"Sucess",Toast.LENGTH_LONG).show();
}

@Override
public void afterTextChanged(Editable e)
{

if(uname.getText().toString().equalsIgnoreCase("sahin") && pwd.getText().toString().equalsIgnoreCase("raj"))
{
login.setEnabled(true);
}


}

@Override
public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
int arg3) {
// TODO Auto-generated method stub

}

@Override
public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3)
{

}    
}

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