How to Create a QR Code & Bar Code Scanner App in Android

At Below we provide how to integrate barcode functionality in android project .

  • Scanning the QR code can be done programmatically by using many ways:
  • Using a web-based API solution, where the QR code or barcode is uploaded to the server, and the server returns the results.
  • Using a web-based application that accesses your camera and scans the QR code or barcode and returns the results.
  • By Integrating the Mobile Vision API of Google Play Service.

    Following are the major formats that the Vision API supports.

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

Android QR Code Scanner Example :-

In this example, we will scan the QR code of a web URL and Email address, and act on it. Here we will use Google Play Mobile Vision API to scan the QR code.

        Create an activity_main.xml and add the following code.

       activity_main.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:gravity="center"
    android:layout_height="match_parent">

    <Button
        android:id="@+id/btnScanBarcode"
        android:layout_width="300dp"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="44dp"
        android:text="Scan Barcode The Code Hub Demo"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintHorizontal_bias="0.676"
        app:layout_constraintStart_toStartOf="parent" />

</LinearLayout>

 

Create an activity_barcode__scane_.xml layout and add the following code. The SurfaceView widget is used for camera source.

<?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:layout_width="match_parent"
    android:layout_height="match_parent"
    android:padding="10dp">

    <SurfaceView
        android:id="@+id/surfaceView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_above="@+id/btnAction"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:layout_centerVertical="true" />

    <TextView
        android:gravity="center"
        android:id="@+id/txtBarcodeValue"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:text="No Barcode Detected"
        android:textColor="@android:color/white"
        android:textSize="20sp" />


    <Button
        android:id="@+id/btnAction"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:text="ADD CONTENT IN THE MAIL" />
</RelativeLayout>

 

Create an activity_email_.xml layout to perform email action.

activity_email_.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:gravity="center"
    android:orientation="vertical">

    <TextView
        android:id="@+id/txtEmailAddress"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:text="Email Address: "
        android:textSize="16dp"
        android:textStyle="bold" />

    <EditText
        android:id="@+id/inSubject"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/txtEmailAddress"
        android:layout_centerHorizontal="true"
        android:ems="10"
        android:hint="Subject" />

    <EditText
        android:id="@+id/inBody"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/inSubject"
        android:layout_centerHorizontal="true"
        android:ems="10"
        android:hint="Body" />

    <Button
        android:id="@+id/btnSendEmail"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/inBody"
        android:layout_centerHorizontal="true"
        android:layout_marginStart="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginBottom="64dp"
        android:gravity="center"
        android:text="Send Email"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />
</LinearLayout>

 

build.gradle To Add This dependency implementation ‘com.google.android.gms:play-services-vision:20.1.3’

 

MainActivity.java

package com.thecodehub.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {
    Button btnScanBarcode;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btnScanBarcode=findViewById(R.id.btnScanBarcode);
        btnScanBarcode.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent =new Intent(getApplicationContext(),Barcode_Scane_Activity.class);
                startActivity(intent);
            }
        });
    }
}

Barcode_Scane_Activity.Java

package com.thecodehub.myapplication;

import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;

import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.os.Bundle;
import android.util.SparseArray;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.vision.CameraSource;
import com.google.android.gms.vision.Detector;
import com.google.android.gms.vision.barcode.Barcode;
import com.google.android.gms.vision.barcode.BarcodeDetector;

import java.io.IOException;

public class Barcode_Scane_Activity extends AppCompatActivity {
    SurfaceView surfaceView;
    TextView txtBarcodeValue;
    private BarcodeDetector barcodeDetector;
    private CameraSource cameraSource;
    private static final int REQUEST_CAMERA_PERMISSION = 201;
    Button btnAction;
    String intentData = "";
    boolean isEmail = false;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_barcode__scane_);
        initViews();
    }
    private void initViews() {
        txtBarcodeValue = findViewById(R.id.txtBarcodeValue);
        surfaceView = findViewById(R.id.surfaceView);
        btnAction = findViewById(R.id.btnAction);
        btnAction.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                if (intentData.length() > 0) {
                    if (isEmail)
                        startActivity(new Intent(getApplicationContext(), Email_Activity.class).putExtra("email_address", intentData));
                    else {
                        startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(intentData)));
                    }
                }
            }
        });
    }

    private void initialiseDetectorsAndSources() {

        Toast.makeText(getApplicationContext(), "Barcode scanner started", Toast.LENGTH_SHORT).show();
        barcodeDetector = new BarcodeDetector.Builder(this)
                .setBarcodeFormats(Barcode.ALL_FORMATS)
                .build();

        cameraSource = new CameraSource.Builder(this, barcodeDetector)
                .setRequestedPreviewSize(1920, 1080)
                .setAutoFocusEnabled(true) //you should add this feature
                .build();

        surfaceView.getHolder().addCallback(new SurfaceHolder.Callback() {
            @Override
            public void surfaceCreated(SurfaceHolder holder) {
                if (ActivityCompat.checkSelfPermission(Barcode_Scane_Activity.this, Manifest.permission.CAMERA) == PackageManager.PERMISSION_GRANTED) {
                    try {
                        cameraSource.start(surfaceView.getHolder());
                    } catch (IOException e) {
                        e.printStackTrace();
                    }
                } else {
                    ActivityCompat.requestPermissions(Barcode_Scane_Activity.this, new
                            String[]{Manifest.permission.CAMERA}, REQUEST_CAMERA_PERMISSION);
                }

            }

            @Override
            public void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {
            }

            @Override
            public void surfaceDestroyed(SurfaceHolder holder) {
                cameraSource.stop();
            }
        });


        barcodeDetector.setProcessor(new Detector.Processor<Barcode>() {
            @Override
            public void release() {
                Toast.makeText(getApplicationContext(), "To prevent memory leaks barcode scanner has been stopped", Toast.LENGTH_SHORT).show();
            }

            @Override
            public void receiveDetections(Detector.Detections<Barcode> detections) {
                final SparseArray<Barcode> barcodes = detections.getDetectedItems();
                if (barcodes.size() != 0) {
                    txtBarcodeValue.post(new Runnable() {
                        @Override
                        public void run() {

                            if (barcodes.valueAt(0).email != null) {
                                txtBarcodeValue.removeCallbacks(null);
                                intentData = barcodes.valueAt(0).email.address;
                                txtBarcodeValue.setText(intentData);
                                isEmail = true;
                                btnAction.setText("ADD CONTENT TO THE MAIL");
                            } else {
                                isEmail = false;
                                btnAction.setText("LAUNCH URL");
                                intentData = barcodes.valueAt(0).displayValue;
                                txtBarcodeValue.setText(intentData);
                            }
                        }
                    });
                }
            }
        });
    }


    @Override
    protected void onPause() {
        super.onPause();
        cameraSource.release();
    }

    @Override
    protected void onResume() {
        super.onResume();
        initialiseDetectorsAndSources();
    }
}

This class performs the email sending task to the address mention in the QR code.

EmailActivity.java

package com.thecodehub.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class Email_Activity extends AppCompatActivity  implements View.OnClickListener{
    EditText inSubject, inBody;
    TextView txtEmailAddress;
    Button btnSendEmail;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_email_);
        initViews();
    }

    private void initViews() {
        inSubject = findViewById(R.id.inSubject);
        inBody = findViewById(R.id.inBody);
        txtEmailAddress = findViewById(R.id.txtEmailAddress);
        btnSendEmail = findViewById(R.id.btnSendEmail);

        if (getIntent().getStringExtra("email_address") != null) {
            txtEmailAddress.setText("Recipient : " + getIntent().getStringExtra("email_address"));
        }

        btnSendEmail.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent intent = new Intent(Intent.ACTION_SEND);
                intent.setType("text/plain");
                intent.putExtra(Intent.EXTRA_EMAIL, new String[]{txtEmailAddress.getText().toString()});
                intent.putExtra(Intent.EXTRA_SUBJECT, inSubject.getText().toString().trim());
                intent.putExtra(Intent.EXTRA_TEXT, inBody.getText().toString().trim());

                startActivity(Intent.createChooser(intent, "Send Email"));
            }
        });
    }

    @Override
    public void onClick(View v) {

        switch (v.getId()) {
            case R.id.btnScanBarcode:
                startActivity(new Intent(Email_Activity.this, Barcode_Scane_Activity.class));
                break;
        }
    }
}

 

AndroidMenifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.thecodehub.myapplication">
    <uses-feature
        android:name="android.hardware.camera"
        android:required="true" />
    <uses-permission android:name="android.permission.CAMERA" />
    <uses-feature android:name="android.hardware.camera.autofocus" />
    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.CAMERA" />
    <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/Theme.MyApplication">
        <activity android:name=".Email_Activity"></activity>
        <activity android:name=".Barcode_Scane_Activity" />
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

 

Code Resource:-

https://github.com/Keyur88/Qr-Code-The-Code-Hub.git

Now you can run your project.

Output:-

Congratulations!!! you have developed your Bar Code Scanner In Android Example Integration. in Android Studio and now just keep following the rest of the tutorial step by step to become a great Android Developer. All the very best.

 

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