How to Create QR code scanner Android app

May 9, 2022, Originally published at cambotutorial.com ・4 min read

In this article, we will build a QR code and barcode reader in an Android app. You may follow the steps below, and I believe you would finish it quickly.

Completed Implementation Bar Code Scanner Android App

Step 1: Create a new project

Go to File -> New -> Project -> Select Empty Activity -> Name project QRScanner -> Finish

Also Read: Extract Website Data with Java using Jsoup Library

Step 2: Insert Dependency

Go to build.gradle file (Module: app). app -> build.gradle(Module: app)

implementation 'com.journeyapps:zxing-android-embedded:4.3.0'

Then press the Sync link to download the library and wait for it to finish.

Step 3: Design Layout

Open the following to edit the layout app -> res -> layout -> activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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=".MainActivity">
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Scan"
        android:layout_centerInParent="true"
        android:id="@+id/btn_scan"
        />
</RelativeLayout>

Also Read: How to Setup Firebase Database Connect to Android Project

Step 4: Java Implementation

Open file the following app -> java -> MainActivity.java

package com.cambotutorial.sovary.qrscanner;
import androidx.activity.result.ActivityResultLauncher;
import androidx.appcompat.app.AppCompatActivity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.Button;
import com.journeyapps.barcodescanner.ScanContract;
import com.journeyapps.barcodescanner.ScanOptions;
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public class MainActivity extends AppCompatActivity
{
    Button btn_scan;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn_scan =findViewById(R.id.btn_scan);
        btn_scan.setOnClickListener(v->
        {
            scanCode();
        });
    }
private void scanCode()
    {
        ScanOptions options = new ScanOptions();
        options.setPrompt("Volume up to flash on");
        options.setBeepEnabled(true);
        options.setOrientationLocked(true);
        options.setCaptureActivity(CaptureAct.class);
        barLaucher.launch(options);
    }
ActivityResultLauncher<ScanOptions> barLaucher = registerForActivityResult(new ScanContract(), result->
    {
        if(result.getContents() !=null)
        {
            AlertDialog.Builder builder = new AlertDialog.Builder(MainActivity.this);
            builder.setTitle("Result");
            builder.setMessage(result.getContents());
            builder.setPositiveButton("OK", new DialogInterface.OnClickListener()
            {
                @Override
                public void onClick(DialogInterface dialogInterface, int i)
                {
                    dialogInterface.dismiss();
                }
            }).show();
        }
    });
}

Also Read: Android — Firebase Realtime Database with CRUD Operation

Step 5: Implement CaptureActivity

Create new Class and implement nothing

package com.cambotutorial.sovary.qrscanner;
import com.journeyapps.barcodescanner.CaptureActivity;

public class CaptureAct extends CaptureActivity
{
}

Step 6: Add Theme & Register Activity

Open and edit file in app -> manifests -> AndroidManifest.xml

<activity android:name=".CaptureAct"
            android:screenOrientation="portrait"
            android:stateNotNeeded="true"
            android:theme="@style/zxing_CaptureTheme"/>

Also Read: How to Pass Data From One Activity to Second Activity

Step 7: Run App

Finally we can run test application

Scan Barcode Example

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