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Example of using PDF417 recognition component for Android
Java
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Latest commit 147a507 Sep 9, 2019

README.md

ScanPdf417 Library

Setup

  1. Add idscan-public maven repository to the project build.gradle file.
allprojects {
    repositories {
        ...
        maven {
            url 'https://www.myget.org/F/idscan-public/maven/'
        }
        ...
    }
}
  1. Add the following to the module build.gradle file:
dependencies {
    ...
    implementation 'net.idscan.components.android:scanpdf417:3.0.0'
    ...
}

Note if you have already installed version before 3.0.0 you have to remove it from the project.

Using

For scanning you need to call PDF417ScanActivity:

Intent i = new Intent(MainActivity.this, PDF417ScanActivity.class);
i.putExtra(PDF417ScanActivity.EXTRA_LICENSE_KEY, "** LICENSE KEY **");
startActivityForResult(i, SCAN_ACTIVITY_CODE);

Note need to replace ** LICENSE KEY ** by your License Key.

To process the result you need to override onActivityResult() of your Activity.

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
  super.onActivityResult(requestCode, resultCode, data);

  if (requestCode == SCAN_ACTIVITY_CODE) {
    switch (resultCode) {
      case PDF417ScanActivity.RESULT_OK:
        if (data != null) {
          PDF417Data result =
                  data.getParcelableExtra(PDF417ScanActivity.DOCUMENT_DATA);
          if (result != null) {
            // TODO: Handle the data.
          }
        }
        break;

    case PDF417ScanActivity.ERROR_RECOGNITION:
      if (data != null) {
        String desc = data.getStringExtra(MrzScanActivity.ERROR_DESCRIPTION);
        // TODO: Handle the error.
      }
      break;

    case PDF417ScanActivity.ERROR_INVALID_CAMERA_NUMBER:
    case PDF417ScanActivity.ERROR_CAMERA_NOT_AVAILABLE:
    case PDF417ScanActivity.ERROR_INVALID_CAMERA_ACCESS:
    case PDF417ScanActivity.RESULT_CANCELED:
      // TODO: Handle the error.
      break;
    }
  }
}

Error codes:

  • ERROR_RECOGNITION License Key invalid or expired or any internal error.

  • ERROR_CAMERA_NOT_AVAILABLE device has no camera.

  • ERROR_INVALID_CAMERA_NUMBER invalid camera number is selected.

  • ERROR_INVALID_CAMERA_ACCESS application cannot access the camera. For example, camera can be captured by the other application or application has no permission to use the camera.

Customization

For customization scanning activity you need to extend PDF417ScanActivity and override some methods.

Custom Viewfinder

The scanning activity has the following structure: Viewfinder structure

By default, Viewfinder layer is a simple view with a frame. You can replace it with a custom view. For that you need to override getViewFinder(LayoutInflater inflater) method. Also, you can add any views to Viewfinder layer.

@Override
protected View getViewFinder(LayoutInflater inflater) {
  View v = inflater.inflate(R.layout.custom_viewfinder, null);

  // TODO: setup view.

  return v;
}

Note Viewfinder layer is drawn as an overlay above the camera preview layer, so it should has a transparent background color.

Select camera

You have two ways to select active camera in the scanning activity:

  1. You can override selectCamera(int number_of_cameras) method and return the number of desired camera.
@Override
protected int selectCamera(int number_of_cameras) {
    // TODO: Return number of camera in range [0, number_of_cameras).
}
  1. You can call setCamera(int id) method to change the current active camera.

Setup camera

You can setup camera settings by overriding customizeCamera(Camera camera, int camera_id) method. This method gets selected camera as input parameter and returns an implementation of ICameraCustomizer interface. This method is invoked every time when activity is recreated or current camera is changed.

onCameraSetup(Camera camera, int format, int width, int height, CameraSettings settings) method of ICameraCustomizer interface is invoked every time when preview layout is changed. You can find reference implementation of ICameraCustomizer at CameraCustomizer.java.

Handle scanned data

By default, when barcode is recognized it returns via onActivityResult method. But you can change this behavior by overriding onData(PDF417Data result) method. That is default implementation of this method:

protected void onData(@NonNull PDF417Data result) {
  finish(result);
}

But you can process scanned data in a different way. For example, you can display barcode on Viewfiender layer. Also you don't have to return the result immediately. Instead of, you can return scanned data at any time in future by calling void finish(PDF417Data result) method.

Flashlight

Since v2.0.6 version, you have two ways to control flashlight:

  1. You can call scanning activity with EXTRA_FLASH_STATE parameter with true value and if flashlight is available it will be turned on.
Intent i = new Intent(MainActivity.this, PDF417ScanActivity.class);
i.putExtra(PDF417ScanActivity.EXTRA_LICENSE_KEY, LIC_KEY);
i.putExtra(PDF417ScanActivity.EXTRA_FLASH_STATE, true);
startActivityForResult(i, SCAN_ACTIVITY_CODE);
  1. You can change state of the flashlight by calling setFlashState(booelan state).
public class CustomScanActivity extends PDF417ScanActivity {
    ...
    void switchFlashlight() {
        setFlashState(!getFlashState());
    }
    ...
}
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