How to Build a QR Code Android App using Firebase?
Last Updated :
23 Jul, 2025
QR (Quick Response) code is a type of two-dimensional barcode that contains information encoded in a pattern of black and white squares. It was first developed in 1994 by a company named Denso Wave. Qr codes can be scanned by a smartphone or a dedicated QR code scanner, which uses the device's camera to read the code and extract the information stored within it. This can include text, URLs, contact information, and more, depending on what the QR code has been programmed to contain. A sample video is given below to get an idea about what we are going to do in this article.
Note: This Android article covered in both Java and Kotlin languages.
QR Scanner
A QR Scanner is a tool that can read and decode QR codes. QR code scanners are widely available as mobile apps that can be downloaded on smartphones and tablets and can be used to scan QR codes using the device's built-in camera. Our QR code scanner app also includes additional features, such as the ability to generate QR codes and share information with others.
Step-by-Step Implementation
Step 1: Create a New Project in Android Studio
To create a new project in Android Studio please refer to How to Create/Start a New Project in Android Studio. Note that select Java as the programming language.
Step 2:
Create two floating buttons, one for scanning the code and the other for generating the QR code.
QR Generator Code:
XML
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="oval">
<gradient
android:startColor="#FDDC74"
android:endColor="#FBD665">
</gradient>
</shape>
</item>
<item android:gravity="center">
<vector android:height="24dp" android:tint="#FFFFFF"
android:viewportHeight="24" android:viewportWidth="24"
android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
<path android:fillColor="@android:color/white" android:pathData="M3,11h8V3H3V11zM5,5h4v4H5V5z"/>
<path android:fillColor="@android:color/white" android:pathData="M3,21h8v-8H3V21zM5,15h4v4H5V15z"/>
<path android:fillColor="@android:color/white" android:pathData="M13,3v8h8V3H13zM19,9h-4V5h4V9z"/>
<path android:fillColor="@android:color/white" android:pathData="M19,19h2v2h-2z"/>
<path android:fillColor="@android:color/white" android:pathData="M13,13h2v2h-2z"/>
<path android:fillColor="@android:color/white" android:pathData="M15,15h2v2h-2z"/>
<path android:fillColor="@android:color/white" android:pathData="M13,17h2v2h-2z"/>
<path android:fillColor="@android:color/white" android:pathData="M15,19h2v2h-2z"/>
<path android:fillColor="@android:color/white" android:pathData="M17,17h2v2h-2z"/>
<path android:fillColor="@android:color/white" android:pathData="M17,13h2v2h-2z"/>
<path android:fillColor="@android:color/white" android:pathData="M19,15h2v2h-2z"/>
</vector>
</item>
</layer-list>
QR Scanner Code:
XML
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="oval">
<gradint
android:startColor="#43DAA6"
android:endColor="#09855C">
</gradint>
</shape>
</item>
<item android:gravity="center">
<vector android:height="24dp" android:tint="#FFFFFF"
android:viewportHeight="24" android:viewportWidth="24"
android:width="24dp" xmlns:android="http://schemas.android.com/apk/res/android">
<path android:fillColor="@android:color/white" android:pathData="M7,3H4v3H2V1h5V3zM22,6V1h-5v2h3v3H22zM7,21H4v-3H2v5h5V21zM20,18v3h-3v2h5v-5H20zM19,18c0,1.1 -0.9,2 -2,2H7c-1.1,0 -2,-0.9 -2,-2V6c0,-1.1 0.9,-2 2,-2h10c1.1,0 2,0.9 2,2V18zM15,8H9v2h6V8zM15,11H9v2h6V11zM15,14H9v2h6V14z"/>
</vector>
</item>
</layer-list>
Output UI:
Step 3:
Add a gradient to your background.
XML
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:shape="rectangle">
<gradient
android:startColor="#615EE8"
android:endColor="#7F6CEF"/>
</shape>
</item>
</selector>
Step 4:
In your activity main xml file add one CardView, one ImageView, two floating action buttons, and one EditText.
XML
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
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"
android:orientation="vertical"
android:background="@drawable/back_qr"
android:gravity="center_horizontal"
tools:context=".MainActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="MY QR CODE"
android:textSize="24sp"
android:textStyle="bold"
android:fontFamily="@font/bold"
android:textColor="@color/white"
android:layout_marginTop="50dp"/>
<androidx.cardview.widget.CardView
android:layout_marginTop="35dp"
android:layout_width="290dp"
android:layout_height="350dp"
app:cardCornerRadius="25dp">
<ImageView
android:id="@+id/img_qr"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scaleType="fitCenter">
</ImageView>
</androidx.cardview.widget.CardView>
<androidx.cardview.widget.CardView
android:layout_width="300dp"
android:layout_height="80dp"
android:layout_marginTop="20dp"
app:cardCornerRadius="50dp"
android:backgroundTint="#5754D3">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:layout_width="43dp"
android:layout_height="43dp"
android:id="@+id/btnQr"
android:layout_marginLeft="17dp"
android:layout_marginTop="20dp"
style="@style/floating_yellow">
</com.google.android.material.floatingactionbutton.FloatingActionButton>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="15dp"
android:text="Generate Your Qr Code"
android:layout_marginLeft="80dp"
android:textColor="@color/white"
android:textStyle="bold"
android:fontFamily="@font/bold"
android:textSize="16sp">
</TextView>
<EditText
android:id="@+id/edtgen"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Enter your Section Here"
android:background="@null"
android:layout_marginTop="45dp"
android:layout_marginLeft="80dp"
android:textColor="@color/white"
android:textColorHint="@color/white"
android:textSize="12sp" />
</RelativeLayout>
</androidx.cardview.widget.CardView>
<com.google.android.material.floatingactionbutton.FloatingActionButton
android:id="@+id/btnScan"
android:layout_width="50dp"
android:layout_height="50dp"
style="@style/floating_green"
android:layout_marginTop="60dp"
android:outlineSpotShadowColor="@color/black"
android:outlineAmbientShadowColor="@color/black"/>
</LinearLayout>
Step 5:
In your main activity add this code, and create two onclick Listeners for generating and scanning the QR code.
Java
package com.shruti.qrcodescanner;
import androidx.appcompat.app.AppCompatActivity;
import androidx.cardview.widget.CardView;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.media.Image;
import android.os.Bundle;
import android.view.View;
import android.view.inputmethod.InputMethod;
import android.view.inputmethod.InputMethodManager;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;
import com.journeyapps.barcodescanner.BarcodeEncoder;
public class MainActivity extends AppCompatActivity {
FloatingActionButton btnQr;
FloatingActionButton btnScan;
EditText edtgen;
ImageView img_qr;
@SuppressLint("WrongViewCast")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
btnScan =(FloatingActionButton) findViewById(R.id.btnScan);
btnQr = (FloatingActionButton)findViewById(R.id.btnQr);
edtgen = (EditText) findViewById(R.id.edtgen);
img_qr = (ImageView) findViewById(R.id.img_qr);
btnScan.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
startActivity(new Intent(getApplicationContext(),qrScanner.class));
}
});
btnQr.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String Gqr = edtgen.getText().toString().trim();
MultiFormatWriter writer = new MultiFormatWriter();
try {
BitMatrix matrix = writer.encode(Gqr, BarcodeFormat.QR_CODE,
260,320);
BarcodeEncoder encoder = new BarcodeEncoder();
Bitmap bitmap = encoder.createBitmap(matrix);
img_qr.setImageBitmap(bitmap);
InputMethodManager manager = (InputMethodManager)getSystemService(
Context.INPUT_METHOD_SERVICE
);
manager.hideSoftInputFromWindow(edtgen.getApplicationWindowToken(),
0);
} catch (WriterException e) {
e.printStackTrace();
}
}
});
}
}
package com.shruti.qrcodescanner
import android.content.Context
import android.content.Intent
import android.graphics.Bitmap
import android.os.Bundle
import android.view.View
import android.view.inputmethod.InputMethodManager
import androidx.appcompat.app.AppCompatActivity
import com.google.android.material.floatingactionbutton.FloatingActionButton
import com.google.zxing.BarcodeFormat
import com.google.zxing.MultiFormatWriter
import com.google.zxing.WriterException
import com.google.zxing.common.BitMatrix
import com.journeyapps.barcodescanner.BarcodeEncoder
import kotlinx.android.synthetic.main.activity_main.*
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
val btnScan = findViewById<FloatingActionButton>(R.id.btnScan)
val btnQr = findViewById<FloatingActionButton>(R.id.btnQr)
val edtgen = findViewById<EditText>(R.id.edtgen)
val img_qr = findViewById<ImageView>(R.id.img_qr)
btnScan.setOnClickListener {
startActivity(Intent(applicationContext, qrScanner::class.java))
}
btnQr.setOnClickListener {
val Gqr = edtgen.text.toString().trim()
val writer = MultiFormatWriter()
try {
val matrix: BitMatrix = writer.encode(
Gqr,
BarcodeFormat.QR_CODE,
260,
320
)
val encoder = BarcodeEncoder()
val bitmap: Bitmap = encoder.createBitmap(matrix)
img_qr.setImageBitmap(bitmap)
val manager = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
manager.hideSoftInputFromWindow(edtgen.applicationWindowToken, 0)
} catch (e: WriterException) {
e.printStackTrace()
}
}
}
}
Step 6:
Create a new Empty activity in your project. Add this code to your Java folder.
Java
package com.shruti.qrcodescanner;
import android.os.Bundle;
import android.Manifest;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.zxing.Result;
import com.karumi.dexter.Dexter;
import com.karumi.dexter.PermissionToken;
import com.karumi.dexter.listener.PermissionDeniedResponse;
import com.karumi.dexter.listener.PermissionGrantedResponse;
import com.karumi.dexter.listener.PermissionRequest;
import com.karumi.dexter.listener.single.PermissionListener;
import me.dm7.barcodescanner.zxing.ZXingScannerView;
public class qrScanner extends AppCompatActivity implements ZXingScannerView.ResultHandler
{
ZXingScannerView scannerView;
DatabaseReference dref ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
scannerView= new ZXingScannerView(this);
setContentView(scannerView);
dref = FirebaseDatabase.getInstance().getReference("information");
Dexter.withContext(getApplicationContext())
.withPermission(Manifest.permission.CAMERA)
.withListener(new PermissionListener() {
@Override
public void onPermissionGranted(PermissionGrantedResponse permissionGrantedResponse) {
scannerView.startCamera();
}
@Override
public void onPermissionDenied(PermissionDeniedResponse permissionDeniedResponse) {
}
@Override
public void onPermissionRationaleShouldBeShown(PermissionRequest permissionRequest, PermissionToken permissionToken) {
permissionToken.continuePermissionRequest();
}
}).check();
}
@Override
public void handleResult(Result rawResult) {
String data = rawResult.getText().toString();
dref.push().setValue(data)
.addOnCompleteListener(new OnCompleteListener<Void>() {
@Override
public void onComplete(@NonNull Task<Void> task) {
onBackPressed();
}
});
}
@Override
protected void onPause() {
super.onPause();
scannerView.stopCamera();
}
@Override
protected void onResume() {
super.onResume();
scannerView.setResultHandler(this);
scannerView.startCamera();
}
}
package com.shruti.qrcodescanner
import android.Manifest
import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import com.google.android.gms.tasks.OnCompleteListener
import com.google.android.gms.tasks.Task
import com.google.firebase.database.DatabaseReference
import com.google.firebase.database.FirebaseDatabase
import com.google.zxing.Result
import com.karumi.dexter.Dexter
import com.karumi.dexter.PermissionToken
import com.karumi.dexter.listener.PermissionDeniedResponse
import com.karumi.dexter.listener.PermissionGrantedResponse
import com.karumi.dexter.listener.PermissionRequest
import com.karumi.dexter.listener.single.PermissionListener
import me.dm7.barcodescanner.zxing.ZXingScannerView
class qrScanner : AppCompatActivity(), ZXingScannerView.ResultHandler {
private lateinit var scannerView: ZXingScannerView
private lateinit var dref: DatabaseReference
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
scannerView = ZXingScannerView(this)
setContentView(scannerView)
dref = FirebaseDatabase.getInstance().getReference("information")
Dexter.withContext(applicationContext)
.withPermission(Manifest.permission.CAMERA)
.withListener(object : PermissionListener {
override fun onPermissionGranted(permissionGrantedResponse: PermissionGrantedResponse) {
scannerView.startCamera()
}
override fun onPermissionDenied(permissionDeniedResponse: PermissionDeniedResponse) {}
override fun onPermissionRationaleShouldBeShown(
permissionRequest: PermissionRequest,
permissionToken: PermissionToken
) {
permissionToken.continuePermissionRequest()
}
}).check()
}
override fun handleResult(rawResult: Result) {
val data = rawResult.text
dref.push().setValue(data)
.addOnCompleteListener { task: Task<Void?> ->
onBackPressed()
}
}
override fun onPause() {
super.onPause()
scannerView.stopCamera()
}
override fun onResume() {
super.onResume()
scannerView.setResultHandler(this)
scannerView.startCamera()
}
}
Step 7:
Add these dependencies in your gradle file.
implementation 'me.dm7.barcodescanner:zxing:1.9.13'
implementation 'com.karumi:dexter:6.2.2'
implementation 'com.journeyapps:zxing-android-embedded:3.4.0'
Step 8:
Add these styles to your themes.xml.
XML
<style>
<style name="CardView." parent="CardView">
<item name ="android:foreground">@drawable/button_grad</item>
</style>
<style name="floating_yellow" parent="Widget.Design.FloatingActionButton">
<item name="android:foreground">@drawable/qr_button</item>
</style>
<style name="floating_green" parent="Widget.Design.FloatingActionButton">
<item name="android:foreground">@drawable/scan_button</item>
</style>
Note: Make sure your project connects your project with Firebase before running on any device or emulator.
Output:
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How to Open Camera Through Intent and Display Captured Image in Android?The purpose of this article is to show how to open a Camera from inside an App and click the image and then display this image inside the same app. An android application has been developed in this article to achieve this. The opening of the Camera from inside our app is achieved with the help of th
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Toast & RecyclerView
Toasts for Android StudioA toast provides a simple popup message that is displayed on the current activity UI screen (e.g. Main Activity). Example: Syntax:// To get ContextContext context = getApplicationContext(); // Message to displayString text = "Toast message"; // Toast time duration, can also set manual value int dura
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What is Toast and How to Use it in Android with Examples?Pre-requisites: Android App Development Fundamentals for BeginnersGuide to Install and Set up Android StudioAndroid | Starting with the first app/android projectAndroid | Running your first Android appWhat is Toast in Android? A Toast is a feedback message. It takes a very little space for displayin
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Android Toast in KotlinA Toast is a short alert message shown on the Android screen for a short interval of time. Android Toast is a short popup notification which is used to display information when we perform any operation in our app. In this tutorial, we shall not just limit ourselves by creating a lame toast but also
3 min read
How to Change Toast font in Android?A Toast is a feedback message. It takes a very little space for displaying while overall activity is interactive and visible to the user. It disappears after a few seconds. It disappears automatically. If user wants permanent visible message, Notification can be used. Note: Toast disappears automati
3 min read
How to add a custom styled Toast in AndroidA Toast is a feedback message. It takes very little space for displaying and it is displayed on top of the main content of an activity, and only remains visible for a short time period. This article explains how to create Custom Toast messages, which has custom background, image, icon, etc, which ar
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RecyclerView in Android with ExampleRecyclerView is a ViewGroup added to the android studio as a successor of the GridView and ListView. It is an improvement on both of them and can be found in the latest v-7 support packages. It has been created to make possible construction of any lists with XML layouts as an item which can be custo
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Android | Horizontal RecyclerView with ExamplesRecycler View is a ViewGroup added to Android Studio as a successor of the GridView and ListView. It is an improvement on both of them and can be found in the latest v-7 support packages. It has been created to make possible construction of any lists with XML layouts as an item which can be customiz
4 min read
How to create a nested RecyclerView in AndroidA nested RecyclerView is an implementation of a RecyclerView within a RecyclerView. An example of such a layout can be seen in a variety of apps such as the Play Store, where the outer (parent) RecyclerView is of vertical orientation, whereas the inner (child) RecyclerViews are of horizontal orienta
5 min read
How to Create RecyclerView with Multiple ViewType in Android?RecyclerView forms a crucial part of the UI in Android app development. It is especially important to optimize memory consumption when displaying a long list of items. A RecyclerView inflates a customized list of items, which can have either similar layouts or multiple distinct layouts. Here, we dev
6 min read
RecyclerView using ListView in Android With ExampleRecyclerView is a more flexible and advanced version of ListView and GridView. RecyclerView is used for providing a limited window to a large data set, which means it is used to display a large amount of data that can be scrolled very efficiently by maintaining a limited number of Views. In Recycler
5 min read