Code scanner library for Android, based on ZXing

Features

• Auto focus and flash light control
• Portrait and landscape screen orientations
• Back and front facing cameras
• Customizable viewfinder
• Kotlin-friendly

Supported formats

1D product	1D industrial	2D
UPC-A	Code 39	QR Code
UPC-E	Code 93	Data Matrix
EAN-8	Code 128	Aztec
EAN-13	Codabar	PDF 417
	ITF	MaxiCode
	RSS-14
	RSS-Expanded

Usage (sample)

Add dependency:

dependencies {
    implementation 'com.budiyev.android:code-scanner:1.9.4'
}

Add camera permission to AndroidManifest.xml (Don't forget about dynamic permissions on API >= 23):

<uses-permission android:name="android.permission.CAMERA"/>

Define a view in your layout file:

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <com.budiyev.android.codescanner.CodeScannerView
        android:id="@+id/scanner_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        app:autoFocusButtonColor="@android:color/white"
        app:autoFocusButtonVisible="true"
        app:flashButtonColor="@android:color/white"
        app:flashButtonVisible="true"
        app:frameColor="@android:color/white"
        app:frameCornersSize="50dp"
        app:frameAspectRatioWidth="1"
        app:frameAspectRatioHeight="1"
        app:frameSize="0.75"
        app:frameThickness="2dp"
        app:maskColor="#77000000"/>
</FrameLayout>

And add following code to your activity:

Kotlin

class MainActivity : AppCompatActivity() {
    private lateinit var codeScanner: CodeScanner

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        val scannerView = findViewById<CodeScannerView>(R.id.scanner_view)
        
        codeScanner = CodeScanner(this, scannerView)
        
        // Parameters (default values)
        codeScanner.camera = CodeScanner.CAMERA_BACK // or CAMERA_FRONT or specific camera id
        codeScanner.formats = CodeScanner.ALL_FORMATS // list of type BarcodeFormat,
                                                      // ex. listOf(BarcodeFormat.QR_CODE)
        codeScanner.autoFocusMode = AutoFocusMode.SAFE // or CONTINUOUS
        codeScanner.scanMode = ScanMode.SINGLE // or CONTINUOUS or PREVIEW
        codeScanner.isAutoFocusEnabled = true // Whether to enable auto focus or not
        codeScanner.isFlashEnabled = false // Whether to enable flash or not
        
        // Callbacks
        codeScanner.decodeCallback = DecodeCallback {
            runOnUiThread {
                Toast.makeText(this, "Scan result: ${it.text}", Toast.LENGTH_LONG).show()
            }
        }
        codeScanner.errorCallback = ErrorCallback { // or ErrorCallback.SUPPRESS
            runOnUiThread {
                Toast.makeText(this, "Camera initialization error: ${it.message}",
                        Toast.LENGTH_LONG).show()
            }
        }
        
        scannerView.setOnClickListener {
            codeScanner.startPreview()
        }
    }

    override fun onResume() {
        super.onResume()
        codeScanner.startPreview()
    }

    override fun onPause() {
        codeScanner.releaseResources()
        super.onPause()
    }
}

Java

public class MainActivity extends AppCompatActivity {
    private CodeScanner mCodeScanner;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        CodeScannerView scannerView = findViewById(R.id.scanner_view);
        mCodeScanner = new CodeScanner(this, scannerView);
        mCodeScanner.setDecodeCallback(new DecodeCallback() {
            @Override
            public void onDecoded(@NonNull final Result result) {
                activity.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(activity, result.getText(), Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
        scannerView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mCodeScanner.startPreview();
            }
        });       
    }

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

    @Override
    protected void onPause() {
        mCodeScanner.releaseResources();
        super.onPause();
    }
}

or fragment:

Kotlin

class MainFragment : Fragment() {
    private lateinit var codeScanner: CodeScanner

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, 
            savedInstanceState: Bundle?): View? {
        return inflater.inflate(R.layout.fragment_main, container, false)
    }

    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
        val scannerView = view.findViewById<CodeScannerView>(R.id.scanner_view)
        val activity = requireActivity()
        codeScanner = CodeScanner(activity, scannerView)
        codeScanner.decodeCallback = DecodeCallback {
            activity.runOnUiThread {
                Toast.makeText(activity, it.text, Toast.LENGTH_LONG).show()
            }
        }
        scannerView.setOnClickListener {
            codeScanner.startPreview()
        }
    }

    override fun onResume() {
        super.onResume()
        codeScanner.startPreview()
    }

    override fun onPause() {
        codeScanner.releaseResources()
        super.onPause()
    }
}

Java

public class MainFragment extends Fragment {
    private CodeScanner mCodeScanner;

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
            @Nullable Bundle savedInstanceState) {
        final Activity activity = getActivity();
        View root = inflater.inflate(R.layout.fragment_main, container, false);
        CodeScannerView scannerView = root.findViewById(R.id.scanner_view);
        mCodeScanner = new CodeScanner(activity, scannerView);
        mCodeScanner.setDecodeCallback(new DecodeCallback() {
            @Override
            public void onDecoded(@NonNull final Result result) {
                activity.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Toast.makeText(activity, result.getText(), Toast.LENGTH_SHORT).show();
                    }
                });
            }
        });
        scannerView.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                mCodeScanner.startPreview();
            }
        });        
        return root;
    }

    @Override
    public void onResume() {
        super.onResume();
        mCodeScanner.startPreview();
    }

    @Override
    public void onPause() {
        mCodeScanner.releaseResources();
        super.onPause();
    }
}

Preview