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";
}
?>
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>
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
}
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();
}
}
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