DocumentDetectorStep

O código a seguir é um exemplo de referência para a implementação correta da SDK em uma activity:

import com.zaig.documentrecognition.Document;
import com.zaig.documentrecognition.DocumentRecognition;
import com.zaig.documentrecognition.DocumentRecognitionResponse;
import com.zaig.documentrecognition.DocumentRecognitionStep;
import com.zaig.documentrecognition.DocumentRecognitionActivity;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {
    ConstraintLayout constraintLayout;
    ImageView backVector, iconVector;
    TextView textViewBack, textViewTitle, textViewDescription;
    Button buttonCNHfull, buttonCNH, buttonRG;
    DocumentRecognitionStep[] DocumentSteps;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_onboarding1);
        constraintLayout = findViewById(R.id.constraintLayout);
        backVector = findViewById(R.id.backVector);
        iconVector = findViewById(R.id.iconVector);
        textViewBack = findViewById(R.id.textViewBack);
        textViewTitle = findViewById(R.id.textViewTitle);
        textViewDescription = findViewById(R.id.textViewDescription);
        buttonCNH = findViewById(R.id.buttonCNH);
        buttonRG = findViewById(R.id.buttonRG);
        buttonCNHfull = findViewById(R.id.buttonCNHfull);

        constraintLayout.setBackgroundColor(Color.parseColor("#000000"));
        backVector.setColorFilter(Color.parseColor("#FFFFFF"));
        iconVector.setColorFilter(Color.parseColor("#FFFFFF"));
        textViewBack.setTextColor(Color.parseColor("#FFFFFF"));
        textViewTitle.setTextColor(Color.parseColor("#FFFFFF"));
        textViewDescription.setTextColor(Color.parseColor("#FFFFFF"));

        backVector.setOnClickListener(this);
        textViewBack.setOnClickListener(this);
        buttonCNH.setOnClickListener(this);
        buttonRG.setOnClickListener(this);
    }

    @Override
    public void onClick(View view) {
        if (view.getId() == R.id.textViewBack || view.getId() == R.id.backVector) {
            finish();
        }
        else if (view.getId() == R.id.buttonCNH) {
            Log.i("OnboardingActivity1Tag", "CNH document was chosen");
            DocumentSteps = new DocumentRecognitionStep[]{
                    new DocumentRecognitionStep(Document.cnh_front),
                    new DocumentRecognitionStep(Document.cnh_back)};
        } else if (view.getId() == R.id.buttonRG) {
            Log.i("OnboardingActivity1Tag", "RG document was chosen");
            DocumentSteps = new DocumentRecognitionStep[]{
                    new DocumentRecognitionStep(Document.rg_front),
                    new DocumentRecognitionStep(Document.rg_back)};
        } else if (view.getId() == R.id.buttonCNHfull) {
            Log.i("OnboardingActivity1Tag", "CNH full document was chosen");
            DocumentSteps = new DocumentRecognitionStep[]{
                    new DocumentRecognitionStep(Document.cnh)};
        }

        Intent intent = new Intent(getApplicationContext(), DocumentRecognitionActivity.class);
        DocumentRecognition mDocumentRecognition = new DocumentRecognition.Builder("d782a5be-2f96-452b-bf21-4d1bbfd0d710")
                .setDocumentSteps(DocumentSteps)
                .setBackgroundColor("#000000")
                .setFontColor("#FFFFFF")
                .setFontFamily(DocumentRecognition.FontFamily.open_sans)
                .setSessionId(String.valueOf(UUID.randomUUID()))
                .setLogLevel(FaceRecognition.LogLevel.debug)
                .build();
        intent.putExtra("settings", mDocumentRecognition);
        startActivityForResult(intent, 1);
        }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (requestCode == 1){
            if (resultCode == RESULT_OK && data != null){
                Intent resultIntent = new Intent();
                setResult(RESULT_OK, resultIntent);
                ArrayList<DocumentRecognitionResponse> mDocumentRecognitionResponse = data.getParcelableArrayListExtra("DocumentRecognitionResponse");
                resultIntent.putParcelableArrayListExtra("DocumentRecognitionResponse", mDocumentRecognitionResponse);
                finish();
            } else {
                // o usuário fechou a activity
            }
        }
        super.onActivityResult(requestCode, resultCode, data);
    }
}