Create new user credential from Android to save in Online Database

This tutorial is to insert a new record from Android apps, to be stored at onine database.

Full code for the backend available at bit.ly/gitjson

The Android Studio project full code also available at GITHUB.

The previous tutorials also available at

+ Login facilities http://bit.ly/loginkerul

+ Insert a new record http://bit.ly/insertkerul

+ Listing & Search http://bit.ly/jsonsearch

+ Complete Android tutorials is available at http://fstm.kuis.edu.my/blog/android/

BACKEND

createuser.php – The backend code to accept the record/data. This PHP script will fetch data from Android form, and send to the database thru SQL.

<?php
include "formcreateuser.php";
// code @GITHUB
// bit.ly/gitjson
// insert.php
include "connect.php";

//$id=$_POST['id'];
if (isset($_POST['uname']) && $_POST['uname']!=null && $_POST['pwd']!=null){
	$uname=$_POST['uname'];
	$pwd=$_POST['pwd'];
	$userlevel=$_POST['userlevel'];
	$fullname=$_POST['fullname'];
	$email=$_POST['email'];

	$rs = mysqli_query($db,
		"INSERT INTO a_training_user
		(uname, pwd, userlevel, fullname, email)
		VALUES 
		('$uname', md5('$pwd'),
		'$userlevel','$fullname','$email')");

	//echo (mysql_error());

	// check for empty result

	if ($rs==true) {
	//insert successfull

		echo "success";

	}//end match found

	else{//no match found

		//send status fail

		echo "error";

	}
}//end null
else{
	echo "error";
}

?>

<?php

include "formcreateuser.php";

// code @GITHUB

// bit.ly/gitjson

// insert.php

include "connect.php";

//$id=$_POST['id'];

if (isset($_POST['uname']) && $_POST['uname']!=null && $_POST['pwd']!=null){

$uname=$_POST['uname'];

$pwd=$_POST['pwd'];

$userlevel=$_POST['userlevel'];

$fullname=$_POST['fullname'];

$email=$_POST['email'];

$rs = mysqli_query($db,

"INSERT INTO a_training_user

(uname, pwd, userlevel, fullname, email)

VALUES

('$uname', md5('$pwd'),

'$userlevel','$fullname','$email')");

//echo (mysql_error());

// check for empty result

if ($rs==true) {

//insert successfull

echo "success";

}//end match found

else{//no match found

//send status fail

echo "error";

}

}//end null

else{

echo "error";

}

FRONT-END (MOBILE APP)

In Android Studio, add a new activity screen to display the insert new record form. As in the picture below, this screen Activity will provide input form for the user to fill in username, password, userlevel, fullname & email.

Android app create new user and save to online database form input screen

The XML for the UI layout.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".CreateUser">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:padding="40dp">

        <ImageView
            android:id="@+id/imageView2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:srcCompat="@drawable/create_user" />

        <EditText
            android:id="@+id/txtusername"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Username*"
            android:inputType="text" />

        <EditText
            android:id="@+id/txtpassword"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Password*"
            android:inputType="textPassword" />

        <EditText
            android:id="@+id/txtpassword2"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Repeat password*"
            android:inputType="textPassword" />

        <Switch
            android:id="@+id/txtadmin"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Admin?" />

        <EditText
            android:id="@+id/txtfullname"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Fullname*"
            android:inputType="textPersonName" />

        <EditText
            android:id="@+id/txtemail"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:ems="10"
            android:hint="Email*"
            android:inputType="textEmailAddress" />

        <Button
            android:id="@+id/bntcreateuser"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="Create User" />

    </LinearLayout>
</android.support.constraint.ConstraintLayout>

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

<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".CreateUser">

<LinearLayout

android:layout_width="match_parent"

android:layout_height="match_parent"

android:orientation="vertical"

android:padding="40dp">

<ImageView

android:id="@+id/imageView2"

android:layout_width="match_parent"

android:layout_height="wrap_content"

app:srcCompat="@drawable/create_user" />

<EditText

android:id="@+id/txtusername"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Username*"

android:inputType="text" />

<EditText

android:id="@+id/txtpassword"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Password*"

android:inputType="textPassword" />

<EditText

android:id="@+id/txtpassword2"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Repeat password*"

android:inputType="textPassword" />

<Switch

android:id="@+id/txtadmin"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="Admin?" />

<EditText

android:id="@+id/txtfullname"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Fullname*"

android:inputType="textPersonName" />

<EditText

android:id="@+id/txtemail"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:ems="10"

android:hint="Email*"

android:inputType="textEmailAddress" />

<Button

android:id="@+id/bntcreateuser"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="Create User" />

</LinearLayout>

</android.support.constraint.ConstraintLayout>

CreateUser.java – The complete code

package com.khirulnizam.json;

import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.CompoundButton;
import android.widget.EditText;
import android.widget.Switch;
import android.widget.Toast;

import org.json.JSONObject;

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.Iterator;

import javax.net.ssl.HttpsURLConnection;

public class CreateUser extends AppCompatActivity
        implements View.OnClickListener{
    String uname, pwd,pwd2, userlevel="regular", fullname, email;
    EditText txtuname, txtpwd,txtpwd2,txtfullname, txtemail;
    Button btncreateuser;
    Switch txtadmin;
    @Override
    protected void onCreate(Bundle savedInstanceState)
        {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_create_user);

        //UI declarations
        txtuname = (EditText)findViewById(R.id.txtusername);
        txtpwd= (EditText)findViewById(R.id.txtpassword);
        txtpwd2= (EditText)findViewById(R.id.txtpassword2);
        txtadmin=(Switch)findViewById(R.id.txtadmin);
        //userlevel
        txtadmin.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if (isChecked) {
                    userlevel = "admin";
                } else {
                    userlevel = "regular";
                }
            }
        });

        txtfullname= (EditText)findViewById(R.id.txtfullname);
        txtemail=(EditText)findViewById(R.id.txtemail);
        btncreateuser=(Button)findViewById(R.id.bntcreateuser);
        btncreateuser.setOnClickListener(this);

    }//end onCreate

    //variables to hold newuser data
    public void onClick(View v){
        if (v.getId()==R.id.bntcreateuser) {

            uname = txtuname.getText().toString();
            //check password repeat same
            pwd = txtpwd.getText().toString();
            pwd2=txtpwd2.getText().toString();
            if (pwd.equals(pwd2)){
                pwd=pwd2;
            }//check password repeat same value
            else{
                pwd="";
            }

            //userlevel = txtadmin.getText().toString();
            fullname = txtfullname.getText().toString();
            email = txtemail.getText().toString();


            //check all fields provided with data
            if(!uname.equals("") && !pwd.equals("") &&
                    !email.equals("") && !fullname.equals("")){

                        //call the AsyncTask if username,password,email provided data
                        new SaveNewRecord().execute();
            }
        }//end btnsave
    }//onClick

    //****************************** Save record process ASYNCTASK, starts here
    public class SaveNewRecord extends AsyncTask<String, Void, String> {
        //the progressdialog
        ProgressDialog progress = new ProgressDialog(CreateUser.this);
        protected void onPreExecute(){
            //set message of the dialog
            progress.setMessage("Saving record to online database...");
            //show dialog
            progress.show();
            super.onPreExecute();
        }

        protected String doInBackground(String... arg0) {

            try {
                // here is your URL path, change the IP number to
                // point to your own server
                URL url = new URL("http://khirulnizam.com/training/createuser.php");

                JSONObject postDataParams = new JSONObject();
                //add name pair values to the connection
                postDataParams.put("uname", uname);
                postDataParams.put("pwd", pwd);
                postDataParams.put("userlevel", userlevel);
                postDataParams.put("fullname", fullname);
                postDataParams.put("email", email);

                Log.e("params",postDataParams.toString());
                Log.e("URL",url.toString());

                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setReadTimeout(15000 /* milliseconds */);
                conn.setConnectTimeout(15000 /* milliseconds */);
                conn.setRequestMethod("POST");//method=post
                conn.setDoInput(true);
                conn.setDoOutput(true);
                conn.connect();//execute the connection

                OutputStream os = conn.getOutputStream();
                BufferedWriter writer = new BufferedWriter(
                        new OutputStreamWriter(os, "UTF-8"));
                writer.write(getPostDataString(postDataParams));

                writer.flush();
                writer.close();
                os.close();

                int responseCode=conn.getResponseCode();
                Log.e("responseCode", "responseCode "+responseCode);
                if (responseCode == HttpsURLConnection.HTTP_OK) {
                    //code 200 connection OK
                    //code 500 server not responding
                    //code 404 file not found
                    //this part is to capture the server response
                    BufferedReader in=new BufferedReader(new
                            InputStreamReader(
                            conn.getInputStream()));
                    //Log.e("response",conn.getInputStream().toString());

                    StringBuffer sb = new StringBuffer("");
                    String line="";

                    do{
                        sb.append(line);
                        Log.e("MSG sb",sb.toString());
                    }while ((line = in.readLine()) != null) ;

                    in.close();
                    Log.e("response",conn.getInputStream().toString());
                    Log.e("textmessage",sb.toString());
                    return sb.toString();//server response message

                }
                else {

                    return new String("false : "+responseCode);
                }
            }
            catch(Exception e){
                //error on connection
                return new String("Exception: " + e.getMessage());
            }
        }

        @Override
        protected void onPostExecute(String result) {
            //Toast.makeText(getApplicationContext(), result,
            //Toast.LENGTH_LONG).show();
            //return result;
            //call method to handle after verification
            if(progress != null && progress.isShowing()){
                progress.dismiss();
            }
            saveVerification(result);//call saveVerification to display dialog
        }
    }//end

    public String getPostDataString(JSONObject params) throws Exception {

        StringBuilder result = new StringBuilder();
        boolean first = true;

        Iterator<String> itr = params.keys();

        while(itr.hasNext()){
            String key= itr.next();
            Object value = params.get(key);

            if (first)
                first = false;
            else
                result.append("&");

            result.append(URLEncoder.encode(key, "UTF-8"));
            result.append("=");
            result.append(URLEncoder.encode(value.toString(), "UTF-8"));

        }
        //Log.i("result",result.toString());
        return result.toString();
    }//end sendPostData

    public void saveVerification(String svrmsg){
        String savemsg="";
        //if new record successfully saved
        Toast.makeText(this, "svrmsg:"+svrmsg, Toast.LENGTH_LONG).show();
        if (svrmsg.equals("success")){

            savemsg="New record succesfully saved.";

        }
        else {//save attempt failed
            savemsg="Fail to save new record!";
        }

        //**********common dialog box
        AlertDialog.Builder builder1 = new AlertDialog.Builder(this);
        builder1.setTitle("Saving Record");
        builder1.setMessage(savemsg);
        builder1.setCancelable(false);
        builder1.setPositiveButton("ok", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        }).create().show();
    }
    //****************************** Save record ASYNCTASK, ends here
}

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package com.khirulnizam.json;

import android.app.ProgressDialog;

import android.content.DialogInterface;

import android.os.AsyncTask;

import android.support.v7.app.AlertDialog;

import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.util.Log;

import android.view.View;

import android.widget.Button;

import android.widget.CompoundButton;

import android.widget.EditText;

import android.widget.Switch;

import android.widget.Toast;

import org.json.JSONObject;

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.InputStreamReader;

import java.io.OutputStream;

import java.io.OutputStreamWriter;

import java.net.HttpURLConnection;

import java.net.URL;

import java.net.URLEncoder;

import java.util.Iterator;

import javax.net.ssl.HttpsURLConnection;

public class CreateUser extends AppCompatActivity

implements View.OnClickListener{

String uname, pwd,pwd2, userlevel="regular", fullname, email;

EditText txtuname, txtpwd,txtpwd2,txtfullname, txtemail;

Button btncreateuser;

Switch txtadmin;

@Override

protected void onCreate(Bundle savedInstanceState)

{

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_create_user);

//UI declarations

txtuname = (EditText)findViewById(R.id.txtusername);

txtpwd= (EditText)findViewById(R.id.txtpassword);

txtpwd2= (EditText)findViewById(R.id.txtpassword2);

txtadmin=(Switch)findViewById(R.id.txtadmin);

//userlevel

txtadmin.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {

if (isChecked) {

userlevel = "admin";

} else {

userlevel = "regular";

}

});

txtfullname= (EditText)findViewById(R.id.txtfullname);

txtemail=(EditText)findViewById(R.id.txtemail);

btncreateuser=(Button)findViewById(R.id.bntcreateuser);

btncreateuser.setOnClickListener(this);

}//end onCreate

//variables to hold newuser data

public void onClick(View v){

if (v.getId()==R.id.bntcreateuser) {

uname = txtuname.getText().toString();

//check password repeat same

pwd = txtpwd.getText().toString();

pwd2=txtpwd2.getText().toString();

if (pwd.equals(pwd2)){

pwd=pwd2;

}//check password repeat same value

else{

pwd="";

}

//userlevel = txtadmin.getText().toString();

fullname = txtfullname.getText().toString();

email = txtemail.getText().toString();

//check all fields provided with data

if(!uname.equals("") && !pwd.equals("") &&

!email.equals("") && !fullname.equals("")){

//call the AsyncTask if username,password,email provided data

new SaveNewRecord().execute();

}

}//end btnsave

}//onClick

//****************************** Save record process ASYNCTASK, starts here

public class SaveNewRecord extends AsyncTask<String, Void, String> {

//the progressdialog

ProgressDialog progress = new ProgressDialog(CreateUser.this);

protected void onPreExecute(){

//set message of the dialog

progress.setMessage("Saving record to online database...");

//show dialog

progress.show();

super.onPreExecute();

}

protected String doInBackground(String... arg0) {

try {

// here is your URL path, change the IP number to

// point to your own server

URL url = new URL("http://khirulnizam.com/training/createuser.php");

JSONObject postDataParams = new JSONObject();

//add name pair values to the connection

postDataParams.put("uname", uname);

postDataParams.put("pwd", pwd);

postDataParams.put("userlevel", userlevel);

postDataParams.put("fullname", fullname);

postDataParams.put("email", email);

Log.e("params",postDataParams.toString());

Log.e("URL",url.toString());

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setReadTimeout(15000 /* milliseconds */);

conn.setConnectTimeout(15000 /* milliseconds */);

conn.setRequestMethod("POST");//method=post

conn.setDoInput(true);

conn.setDoOutput(true);

conn.connect();//execute the connection

OutputStream os = conn.getOutputStream();

BufferedWriter writer = new BufferedWriter(

new OutputStreamWriter(os, "UTF-8"));

writer.write(getPostDataString(postDataParams));

writer.flush();

writer.close();

os.close();

int responseCode=conn.getResponseCode();

Log.e("responseCode", "responseCode "+responseCode);

if (responseCode == HttpsURLConnection.HTTP_OK) {

//code 200 connection OK

//code 500 server not responding

//code 404 file not found

//this part is to capture the server response

BufferedReader in=new BufferedReader(new

InputStreamReader(

conn.getInputStream()));

//Log.e("response",conn.getInputStream().toString());

StringBuffer sb = new StringBuffer("");

String line="";

do{

sb.append(line);

Log.e("MSG sb",sb.toString());

}while ((line = in.readLine()) != null) ;

in.close();

Log.e("response",conn.getInputStream().toString());

Log.e("textmessage",sb.toString());

return sb.toString();//server response message

}

else {

return new String("false : "+responseCode);

}

catch(Exception e){

//error on connection

return new String("Exception: " + e.getMessage());

}

@Override

protected void onPostExecute(String result) {

//Toast.makeText(getApplicationContext(), result,

//Toast.LENGTH_LONG).show();

//return result;

//call method to handle after verification

if(progress != null && progress.isShowing()){

progress.dismiss();

}

saveVerification(result);//call saveVerification to display dialog

}

}//end

public String getPostDataString(JSONObject params) throws Exception {

StringBuilder result = new StringBuilder();

boolean first = true;

Iterator<String> itr = params.keys();

while(itr.hasNext()){

String key= itr.next();

Object value = params.get(key);

if (first)

first = false;

else

result.append("&");

result.append(URLEncoder.encode(key, "UTF-8"));

result.append("=");

result.append(URLEncoder.encode(value.toString(), "UTF-8"));

}

//Log.i("result",result.toString());

return result.toString();

}//end sendPostData

public void saveVerification(String svrmsg){

String savemsg="";

//if new record successfully saved

Toast.makeText(this, "svrmsg:"+svrmsg, Toast.LENGTH_LONG).show();

if (svrmsg.equals("success")){

savemsg="New record succesfully saved.";

}

else {//save attempt failed

savemsg="Fail to save new record!";

}

//**********common dialog box

AlertDialog.Builder builder1 = new AlertDialog.Builder(this);

builder1.setTitle("Saving Record");

builder1.setMessage(savemsg);

builder1.setCancelable(false);

builder1.setPositiveButton("ok", new DialogInterface.OnClickListener() {

@Override

public void onClick(DialogInterface dialog, int which) {

dialog.cancel();

}

}).create().show();

}

//****************************** Save record ASYNCTASK, ends here

}

HttpHandler.java class – this is a helper class to handle data communication to the online server.

package com.khirulnizam.json;

//HttpHandler.java

import android.util.Log;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.ProtocolException;
import java.net.URL;

public class HttpHandler {

    private static final String TAG = HttpHandler.class.getSimpleName();

    public HttpHandler() {
    }

    public String makeServiceCall(String reqUrl) {
        String response = null;
        try {
            URL url = new URL(reqUrl);
            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.setRequestMethod("GET");//method type
            // read the response
            InputStream in = new BufferedInputStream(conn.getInputStream());
            response = convertStreamToString(in);
        } catch (MalformedURLException e) {
            Log.e(TAG, "MalformedURLException: " + e.getMessage());
        } catch (ProtocolException e) {
            Log.e(TAG, "ProtocolException: " + e.getMessage());
        } catch (IOException e) {
            Log.e(TAG, "IOException: " + e.getMessage());
        } catch (Exception e) {
            Log.e(TAG, "Exception: " + e.getMessage());
        }
        return response;
    }

    private String convertStreamToString(InputStream is) {
        BufferedReader reader = new BufferedReader(new InputStreamReader(is));
        StringBuilder sb = new StringBuilder();

        String line;
        try {
            while ((line = reader.readLine()) != null) {
                sb.append(line).append('\n');
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                is.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
        return sb.toString();
    }
}

package com.khirulnizam.json;

//HttpHandler.java

import android.util.Log;

import java.io.BufferedInputStream;

import java.io.BufferedReader;

import java.io.IOException;

import java.io.InputStream;

import java.io.InputStreamReader;

import java.net.HttpURLConnection;

import java.net.MalformedURLException;

import java.net.ProtocolException;

import java.net.URL;

public class HttpHandler {

private static final String TAG = HttpHandler.class.getSimpleName();

public HttpHandler() {

}

public String makeServiceCall(String reqUrl) {

String response = null;

try {

URL url = new URL(reqUrl);

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.setRequestMethod("GET");//method type

// read the response

InputStream in = new BufferedInputStream(conn.getInputStream());

response = convertStreamToString(in);

} catch (MalformedURLException e) {

Log.e(TAG, "MalformedURLException: " + e.getMessage());

} catch (ProtocolException e) {

Log.e(TAG, "ProtocolException: " + e.getMessage());

} catch (IOException e) {

Log.e(TAG, "IOException: " + e.getMessage());

} catch (Exception e) {

Log.e(TAG, "Exception: " + e.getMessage());

}

return response;

}

private String convertStreamToString(InputStream is) {

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

StringBuilder sb = new StringBuilder();

String line;

try {

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

sb.append(line).append('\n');

}

} catch (IOException e) {

e.printStackTrace();

} finally {

try {

is.close();

} catch (IOException e) {

e.printStackTrace();

}

return sb.toString();

}

Trainer:
KHIRULNIZAM ABD RAHMAN, Department of Computer Science, FSTM KUIS.

He is a certified HRDF Trainer – specializing in client-side and back-end web based system development since 2000. His main programming language ingterests are Java, Android, PHP, Laravel JSON, MySQL, and currently Flutter.

Among short-courses he conducted are;

His personal blog is at KERUL.net . You could email him at khirulnizam@gmail.com , or Whatsapp: http://wasap.my/60129034614

Create new user credential from Android to save in Online Database

BACKEND

FRONT-END (MOBILE APP)

Khirulnizam Abd Rahman

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