Android QR Code / Barcode Scanner

A QR code or barcode scanner is sometimes required in an android application. There are various ways to scan the QR code programmatically:

Using a web-based API solution:

The QR code or barcode is uploaded to the server, and the result is returned by the server.

Using a web-based application:

The camera is accessed to scan the QR code or barcode and the result is returned.

By Integrating the Mobile Vision API of Google Play Service.

Android QR Code Scanner Example:

In the below example, we will use the Mobile Vision API of Google Play Service to scan the QR code that supports the below formats of the barcode.

1D barcodes: EAN-8, UPC-A, EAN-13, EAN-8, UPC-E, Code-93, Code-128, Code-39, Codabar, ITF.
2D barcodes: QR Code, Data Matrix, AZTEC, PDF-417.

activity_main.xml:

In the activity_main.xml file, we will write the below code.

<?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:id="@+id/relativeLayout"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:padding="4dp"
   tools:context=".MainActivity">
<TextView
   android:layout_below="@id/button"
   android:layout_centerInParent="true"
   android:layout_marginBottom="10dp"
   android:text="Bar Code Reader"
   android:textSize="16sp"
   android:textStyle="bold"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:id="@+id/txtContent"/>
<Button
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:text="Scan"
   android:layout_marginTop="50dp"
   android:layout_centerHorizontal="true"
   android:id="@+id/button" />
</RelativeLayout>

build.gradle:

In the build.gradle file, we will add the Google Mobile Vision API.

implementation 'com.google.zxing:core:3.2.1'
implementation 'com.journeyapps:zxing-android-embedded:3.2.0@aar'

MainActivity.java:

In the MainActivity.java file, we will add the code to call the ScannedBarcodeActivity.java class, on the button click.

import androidx.appcompat.app.AppCompatActivity;
import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import com.google.zxing.integration.android.IntentIntegrator;
import com.google.zxing.integration.android.IntentResult;
public class MainActivity extends AppCompatActivity {
   Button btnBarcode;
   TextView textView;
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      btnBarcode = findViewById(R.id.button);
      textView = findViewById(R.id.txtContent);
      btnBarcode.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            IntentIntegrator intentIntegrator = new IntentIntegrator(MainActivity.this);
            intentIntegrator.setDesiredBarcodeFormats(intentIntegrator.ALL_CODE_TYPES);
            intentIntegrator.setBeepEnabled(false);
            intentIntegrator.setCameraId(0);
            intentIntegrator.setPrompt("SCAN");
            intentIntegrator.setBarcodeImageEnabled(false);
            intentIntegrator.initiateScan();
         }
      });
   }
   @Override
   protected void onActivityResult(int requestCode, int resultCode, Intent data) {
      IntentResult Result = IntentIntegrator.parseActivityResult(requestCode, resultCode, data);
      if (Result != null) {
         if (Result.getContents() == null) {
            Toast.makeText(this, "cancelled", Toast.LENGTH_SHORT).show();
         } else {
            Log.d("MainActivity", "Scanned");
            Toast.makeText(this, "Scanned -> " + Result.getContents(), Toast.LENGTH_SHORT).show();
textView.setText(String.format("Scanned Result: %s", Result));
         }
      } else {
         super.onActivityResult(requestCode, resultCode, data);
      }
   }
}

AndroidManifest.xml:

In the AndroidManifest.xml file, we will add the below code that includes these uses-features and uses permissions.

<uses-feature android:name="android.hardware.camera.autoFocus" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

File: AndroidManifest.xml:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example.radioapp">
   <application
      android:allowBackup="true"
      android:icon="@mipmap/ic_launcher"
      android:label="@string/app_name"
      android:roundIcon="@mipmap/ic_launcher_round"
      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>
</application>
<uses-feature android:name="android.hardware.camera.autoFocus" />
<uses-feature android:name="android.hardware.camera" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
</manifest>

Output 1:

Output 2:

Output 3:

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