Android has deprecated the Apache module(HttpPost and HttpGet) since API level 22, Now the alternate way is to use JAVA's built in library HttpURLConnection Class. This tutorial does not involves any library to send and recieve data like Volley, HttpOk etc.
Table ‘tbl_login’ contains username and password of user.
CREATE TABLE 'tbl_login' (
'email' varchar(255) NOT NULL,
'password' varchar(255) NOT NULL
);
Table holds data row like this.
INSERT INTO 'tbl_login' ('email', 'password') VALUES
('16bcah06@gmail.com', 'password'),('nilenp22@gmail.com','pw');
include config.inc.php file to connect database. Check if POST data is set from android. Query the database to see row exist or not. Return the result.
<?php
include 'config.inc.php';
// Check whether username or password is set from android
if(isset($_POST['username']) && isset($_POST['password']))
{
// Innitialize Variable
$result='';
$username = $_POST['username'];
$password = $_POST['password'];
// Query database for row exist or not
$sql = 'SELECT * FROM tbl_login WHERE email = :username AND password = :password';
$stmt = $conn->prepare($sql);
$stmt->bindParam(':username', $username, PDO::PARAM_STR);
$stmt->bindParam(':password', $password, PDO::PARAM_STR);
$stmt->execute();
if($stmt->rowCount())
{
$result="true";
}
elseif(!$stmt->rowCount())
{
$result="false";
}
// send result back to android
echo $result;
}
?>
<?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "9tutorials";
try {
$conn = new PDO("mysql:host=$servername;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
}
catch(PDOException $e)
{
die("OOPs something went wrong");
}
?>
The image on the top of page shows both MainActivity.java and SuccessActivity.java respectively. MainActivity.java On LogIn button click checkLogin() function is triggered. Which innitiate AsyncLogin class to carry out Asynchronous task. onPreExecute(), invoked on the UI thread before the task is executed. Here We are displaying loading message. doInBackground(Params…), invoked on the background thread immediately after onPreExecute() finishes executing. The sending and recieving data from and to php file using HttpURLConnection class has done in this function. onPostExecute(Result), invoked on the UI thread after the background computation finishes. Here we are checking for recieved result. The parameters params[0] and params[1] is from AsyncLogin’s execute method.
package com.guru.login;
import android.app.ProgressDialog;
import android.content.Intent;
import android.content.SharedPreferences;
import android.net.Uri;
import android.os.AsyncTask;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
public class MainActivity extends AppCompatActivity {
// CONNECTION_TIMEOUT and READ_TIMEOUT are in milliseconds
public static final int CONNECTION_TIMEOUT=10000;
public static final int READ_TIMEOUT=15000;
private EditText etEmail;
private EditText etPassword;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Get Reference to variables
etEmail = (EditText) findViewById(R.id.email);
etPassword = (EditText) findViewById(R.id.password);
}
// Triggers when LOGIN Button clicked
public void checkLogin(View arg0) {
// Get text from email and passord field
final String email = etEmail.getText().toString();
final String password = etPassword.getText().toString();
// Initialize AsyncLogin() class with email and password
new AsyncLogin().execute(email,password);
}
private class AsyncLogin extends AsyncTask<String, String, String>
{
ProgressDialog pdLoading = new ProgressDialog(MainActivity.this);
HttpURLConnection conn;
URL url = null;
@Override
protected void onPreExecute() {
super.onPreExecute();
//this method will be running on UI thread
pdLoading.setMessage("\tLoading...");
pdLoading.setCancelable(false);
pdLoading.show();
}
@Override
protected String doInBackground(String... params) {
try {
// Enter URL address where your php file resides
url = new URL("http://localhost/test/login.inc.php");
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
return "exception";
}
try {
// Setup HttpURLConnection class to send and receive data from php and mysql
conn = (HttpURLConnection)url.openConnection();
conn.setReadTimeout(READ_TIMEOUT);
conn.setConnectTimeout(CONNECTION_TIMEOUT);
conn.setRequestMethod("POST");
// setDoInput and setDoOutput method depict handling of both send and receive
conn.setDoInput(true);
conn.setDoOutput(true);
// Append parameters to URL
Uri.Builder builder = new Uri.Builder()
.appendQueryParameter("username", params[0])
.appendQueryParameter("password", params[1]);
String query = builder.build().getEncodedQuery();
// Open connection for sending data
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(query);
writer.flush();
writer.close();
os.close();
conn.connect();
} catch (IOException e1) {
// TODO Auto-generated catch block
e1.printStackTrace();
return "exception";
}
try {
int response_code = conn.getResponseCode();
// Check if successful connection made
if (response_code == HttpURLConnection.HTTP_OK) {
// Read data sent from server
InputStream input = conn.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(input));
StringBuilder result = new StringBuilder();
String line;
while ((line = reader.readLine()) != null) {
result.append(line);
}
// Pass data to onPostExecute method
return(result.toString());
}else{
return("unsuccessful");
}
} catch (IOException e) {
e.printStackTrace();
return "exception";
} finally {
conn.disconnect();
}
}
@Override
protected void onPostExecute(String result) {
//this method will be running on UI thread
pdLoading.dismiss();
if(result.equalsIgnoreCase("true"))
{
/* Here launching another activity when login successful. If you persist login state
use sharedPreferences of Android. and logout button to clear sharedPreferences.
*/
Intent intent = new Intent(MainActivity.this,SuccessActivity.class);
startActivity(intent);
MainActivity.this.finish();
}else if (result.equalsIgnoreCase("false")){
// If username and password does not match display a error message
Toast.makeText(MainActivity.this, "Invalid email or password", Toast.LENGTH_LONG).show();
} else if (result.equalsIgnoreCase("exception") || result.equalsIgnoreCase("unsuccessful")) {
Toast.makeText(MainActivity.this, "OOPs! Something went wrong. Connection Problem.", Toast.LENGTH_LONG).show();
}
}
}
}
The xml file for MainActivity.java.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin" tools:context=".MainActivity">
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textEmailAddress"
android:ems="10"
android:id="@+id/email"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:hint="Email"
android:layout_marginTop="10dp"/>
<EditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:inputType="textPassword"
android:ems="10"
android:id="@+id/password"
android:layout_below="@+id/email"
android:hint="Password"
android:layout_marginTop="10dp"/>
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="LOGIN"
android:id="@+id/button"
android:layout_below="@+id/password"
android:layout_marginTop="10dp"
android:onClick="checkLogin"/>
</RelativeLayout>
This Activity is launched from onPreExecute() method after login success.
package com.guru.login;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
public class SuccessActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_success);
}
}
# activity_success.xml
The xml file for SuccessActivity.java.
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="WELCOME"
android:id="@+id/textView"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:layout_marginTop="62dp" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceMedium"
android:text="Successfully LoggedIn"
android:id="@+id/textView2"
android:layout_marginTop="46dp"
android:layout_below="@+id/textView"
android:layout_centerHorizontal="true" />
</RelativeLayout>
Don’t forget to add uses-permission and SuccessActivity to your AndroidManifest.xml file.
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.guru.login" >
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"
android:label="@string/app_name"
android:supportsRtl="true"
android:theme="@style/AppTheme" >
<activity android:name=".MainActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".SuccessActivity" >
</activity>
</application>
</manifest>