Android

Android TutorialAdding a FuseView to an Android ProjectAndroid 9-Patch ImagesAndroid Accessing SQLite databases using the ContentValues classAndroid Accounts and AccountManagerAndroid ACRAAndroid ActivityAndroid Activity RecognitionAndroid adb (Android Debug Bridge)Android adb shellAndroid AdMobAndroid AIDLAndroid AlarmManagerAndroid Android-x86 in VirtualBoxAndroid Animated AlertDialog BoxAndroid AnimatorsAndroid Annotation ProcessorAndroid Architecture ComponentsAndroid AsyncTaskAndroid AudioManagerAndroid AudioTrackAndroid AuthenticatorAndroid AutoCompleteTextViewAndroid Autosizing TextViewsAndroid Barcode and QR code readingAndroid Bitmap CacheAndroid Bluetooth and Bluetooth LE APIAndroid Bluetooth Low EnergyAndroid Bottom SheetsAndroid BottomNavigationViewAndroid BroadcastReceiverAndroid Building Backwards Compatible AppsAndroid ButterKnifeAndroid ButtonAndroid Callback URLAndroid Camera 2 APIAndroid Camera and GalleryAndroid Canvas drawing using SurfaceViewAndroid Capturing ScreenshotsAndroid CardViewAndroid Check Data ConnectionAndroid Check Internet ConnectivityAndroid CleverTapAndroid ColorsAndroid ConstraintLayoutAndroid ConstraintSetAndroid ContentProviderAndroid ContextAndroid CoordinatorLayout and BehaviorsAndroid Count Down TimerAndroid Crash Reporting ToolsAndroid Create Singleton Class for Toast MessageAndroid Creating Custom ViewsAndroid Creating Overlay (always-on-top) WindowsAndroid Creating Splash screenAndroid Custom FontsAndroid Dagger 2Android Data Binding LibraryAndroid Data Encryption/DecryptionAndroid Data Synchronization with Sync AdapterAndroid Date and Time PickersAndroid DayNight Theme (AppCompat v23.2 / API 14+)Android Define step value (increment) for custom RangeSeekBarAndroid Design PatternsAndroid Device Display MetricsAndroid DialogAndroid Displaying Google AdsAndroid Doze ModeAndroid DrawablesAndroid EditTextAndroid Email ValidationAndroid EmulatorAndroid Enhancing Alert DialogsAndroid ExceptionsAndroid ExoPlayerAndroid FastjsonAndroid fastlaneAndroid FileProviderAndroid FirebaseAndroid Firebase App IndexingAndroid Firebase Cloud MessagingAndroid Firebase Crash ReportingAndroid Firebase Realtime DataBaseAndroid FloatingActionButtonAndroid Formatting phone numbers with pattern.Android Formatting StringsAndroid FragmentsAndroid FrescoAndroid game developmentAndroid Gesture Detection



Android Barcode and QR code reading

From WikiOD

Remarks[edit | edit source]

QRCodeReaderView

Zxing

Using QRCodeReaderView (based on Zxing)[edit | edit source]

QRCodeReaderView implements an Android view which show camera and notify when there's a QR code inside the preview.

It uses the zxing open-source, multi-format 1D/2D barcode image processing library.

Adding the library to your project[edit | edit source]

Add QRCodeReaderView dependency to your build.gradle

dependencies{
    compile 'com.dlazaro66.qrcodereaderview:qrcodereaderview:2.0.0'
}

First use[edit | edit source]

  • Add to your layout a QRCodeReaderView
 <com.dlazaro66.qrcodereaderview.QRCodeReaderView
        android:id="@+id/qrdecoderview"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

Then in your Activity, you can use it as follows:

    public class DecoderActivity extends Activity implements OnQRCodeReadListener {

    private TextView resultTextView;
    private QRCodeReaderView qrCodeReaderView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_decoder);

        qrCodeReaderView = (QRCodeReaderView) findViewById(R.id.qrdecoderview);
        qrCodeReaderView.setOnQRCodeReadListener(this);

        // Use this function to enable/disable decoding
        qrCodeReaderView.setQRDecodingEnabled(true);

        // Use this function to change the autofocus interval (default is 5 secs)
        qrCodeReaderView.setAutofocusInterval(2000L);

        // Use this function to enable/disable Torch
        qrCodeReaderView.setTorchEnabled(true);

        // Use this function to set front camera preview
        qrCodeReaderView.setFrontCamera();

        // Use this function to set back camera preview
        qrCodeReaderView.setBackCamera();
    }

    // Called when a QR is decoded
    // "text" : the text encoded in QR
    // "points" : points where QR control points are placed in View
    @Override
    public void onQRCodeRead(String text, PointF[] points) {
        resultTextView.setText(text);
    }

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

    @Override
    protected void onPause() {
        super.onPause();
        qrCodeReaderView.stopCamera();
    }
}

Credit:Stack_Overflow_Documentation