Android Login Screen Using HttpClient

In Android we can use HTTP POST request with org.apache.http.client.HttpClient to post data to a URL. This sample project illustrate how we can post data to a URL and get the response. 

Here is the screen shot of login screen.

Try the same with the below code :

Code

package com.sencide;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.util.ArrayList;

import java.util.List;

import org.apache.http.HttpResponse;

import org.apache.http.NameValuePair;

import org.apache.http.client.ClientProtocolException;

import org.apache.http.client.HttpClient;

import org.apache.http.client.entity.UrlEncodedFormEntity;

import org.apache.http.client.methods.HttpPost;

import org.apache.http.impl.client.DefaultHttpClient;

import org.apache.http.message.BasicNameValuePair;

import android.app.Activity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.view.View.OnClickListener;

import android.widget.Button;

import android.widget.EditText;

import android.widget.TextView;

public class AndroidLogin extends Activity implements OnClickListener {

  

 Button ok,back,exit;

 TextView result;

  

    /** Called when the activity is first created. */

    @Override

    public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.main);

         

        // Login button clicked

        ok = (Button)findViewById(R.id.btn_login);

        ok.setOnClickListener(this);

         

        result = (TextView)findViewById(R.id.lbl_result);

         

    }

     

    public void postLoginData() {

        // Create a new HttpClient and Post Header

        HttpClient httpclient = new DefaultHttpClient();

         

        /* login.php returns true if username and password is equal to saranga */

        HttpPost httppost = new HttpPost("http://localhost_address");

        try {

            // Add user name and password

         EditText uname = (EditText)findViewById(R.id.txt_username);

         String username = uname.getText().toString();

         EditText pword = (EditText)findViewById(R.id.txt_password);

         String password = pword.getText().toString();

          

            List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);

            nameValuePairs.add(new BasicNameValuePair("username", username));

            nameValuePairs.add(new BasicNameValuePair("password", password));

            httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

            // Execute HTTP Post Request

            Log.w("SENCIDE", "Execute HTTP Post Request");

            HttpResponse response = httpclient.execute(httppost);

             

            String str = inputStreamToString(response.getEntity().getContent()).toString();

            Log.w("SENCIDE", str);

             

            if(str.toString().equalsIgnoreCase("true"))

            {

             Log.w("SENCIDE", "TRUE");

             result.setText("Login successful");  

            }else

            {

             Log.w("SENCIDE", "FALSE");

             result.setText(str);            

            }

        } catch (ClientProtocolException e) {

         e.printStackTrace();

        } catch (IOException e) {

         e.printStackTrace();

        }

    }

   

    private StringBuilder inputStreamToString(InputStream is) {

     String line = "";

     StringBuilder total = new StringBuilder();

     // Wrap a BufferedReader around the InputStream

     BufferedReader rd = new BufferedReader(new InputStreamReader(is));

     // Read response until the end

     try {

      while ((line = rd.readLine()) != null) {

        total.append(line);

      }

     } catch (IOException e) {

      e.printStackTrace();

     }

     // Return full string

     return total;

    }

    @Override

    public void onClick(View view) {

      if(view == ok){

        postLoginData();

      }

    }

}

Following code is the content of mail.xml file that is used in the above code.

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

<AbsoluteLayout

android:layout_width="fill_parent"

android:layout_height="fill_parent"

xmlns:android="http://localhost_address"

> 

<EditText android:layout_width="150px" android:layout_height="wrap_content" android:textSize="18sp" android:id="@+id/txt_username" android:layout_y="132dip" android:layout_x="128dip"></EditText>

<EditText android:layout_width="150px" android:layout_height="wrap_content" android:textSize="18sp" android:password="true" android:id="@+id/txt_password" android:layout_x="128dip" android:layout_y="192dip"></EditText>

<Button android:layout_width="100px" android:layout_height="wrap_content" android:id="@+id/btn_login" android:layout_x="178dip" android:layout_y="252dip" android:text="Login"></Button>

<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lbl_username" android:text="User Name" android:layout_x="37dip" android:layout_y="150dip"></TextView>

<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lbl_password" android:text="Password" android:layout_y="207dip" android:layout_x="50dip"></TextView>

<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:id="@+id/lbl_top" android:textSize="16sp" android:typeface="sans" android:text="Please Loggin First" android:layout_x="29dip" android:layout_y="94dip"></TextView>

<TextView android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_y="312dip" android:layout_x="50dip" android:id="@+id/lbl_result"></TextView>

</AbsoluteLayout>

Following code is the content of AndroidManifest.xml file that is used in this project. There note that I have add the line <uses-permission android:name= "android.permission.INTERNET".

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

<manifest xmlns:android="http://localhost_address"

      package="com.sencide"

      android:versionCode="1"

      android:versionName="1.0">

 <uses-permission android:name="android.permission.INTERNET" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">

        <activity android:name=".AndroidLogin"

                  android:label="@string/app_name">

            <intent-filter>

                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />

            </intent-filter>

        </activity>

    </application>

</manifest>