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ext {
    okHttpVersion = '3.14.4'
    retrofitVersion = '2.6.2'
}

dependencies {
    implementation 'androidx.appcompat:appcompat:1.2.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation "com.squareup.okhttp3:okhttp:$okHttpVersion"
    implementation "com.squareup.okhttp3:logging-interceptor:$okHttpVersion"
    implementation "com.squareup.retrofit2:retrofit:$retrofitVersion"
    implementation "com.squareup.retrofit2:converter-gson:$retrofitVersion"
    implementation 'com.jakewharton.timber:timber:4.7.1'
    implementation 'com.otaliastudios:cameraview:2.6.4'
    implementation fileTree(include: ['*.aar'], dir: '../libs')
}

android {

  splits {
    abi {
        enable true
        reset()
        include 'x86', 'x86_64', 'arm64-v8a', 'armeabi-v7a'
        universalApk false
    }
  }
}

ZenId zenId = new ZenId.Builder()
        .applicationContext(getApplicationContext())
        .modules(new DocumentModule(), new SelfieModule(), new FaceLivenessModule())
        .build();

// Make the instance globally accessible.
ZenId.setSingletonInstance(zenId);

// This may take a few seconds. Please do it as soon as possible.
zenId.initialize();

ApiConfig apiConfig = new ApiConfig.Builder()
        .baseUrl("http://your.frauds.zenid.cz/api/") 
        .apiKey("your_api_key")
        .build();

OkHttpClient okHttpClient = new OkHttpClient().newBuilder()
        // .addInterceptor() if you want to add a logging interceptor and so on
        .build();

ApiService apiService = new ApiService.Builder()
        .apiConfig(apiConfig)
        .okHttpClient(okHttpClient)
        .build();

String challengeToken = ZenId.get().getSecurity().getChallengeToken();
Timber.i("challengeToken: %s", challengeToken);
apiService.getInitSdk(challengeToken).enqueue(new Callback<InitResponseJson>() {

    @Override
    public void onResponse(Call<InitResponseJson> call, Response<InitResponseJson> response) {
        String responseToken = response.body().getResponse();
        Timber.i("responseToken: %s", responseToken);
        boolean authorized = ZenId.get().getSecurity().authorize(getApplicationContext(), responseToken);
        Timber.i("Authorized: %s", authorized);
    }

    @Override
    public void onFailure(Call<InitResponseJson> call, Throwable t) {
        Timber.e(t);
    }
});

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <cz.trask.zenid.sdk.DocumentPictureView
        android:id="@+id/documentPictureView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</FrameLayout>

// For activities
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    DocumentPictureView documentPictureView = findViewById(R.id.documentPictureView);
    documentPictureView.setLifecycleOwner(this);
}

// For fragments
@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);
    DocumentPictureView documentPictureView = findViewById(R.id.documentPictureView);
    documentPictureView.setLifecycleOwner(getViewLifecycleOwner());
}

documentPictureView.setCallback(new DocumentPictureView.Callback() {

    @Override
    public void onStateChanged(DocumentPictureState state) {
        Timber.i("state: %s", state);
    }

    @Override
    public void onPictureTaken(DocumentResult result) {
        Timber.i("result: %s", result);
    }
});

@Override
public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if (isCameraPermissionDenied(grantResults)) {
        if (shouldShowRequestPermissionRationale()) {
            Timber.i("Camera permission denied but selfieView will immediately request camera permission again.");
        } else {
            selfieView.setAutoRequestPermissions(false);
            Timber.i("Camera permission denied with -don't ask again- option.");
        }
    } else {
        Timber.i("Camera permission granted!");
    }
}

private boolean isCameraPermissionDenied(int[] grantResults) {
    return grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_DENIED;
}

private boolean shouldShowRequestPermissionRationale() {
    return ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.CAMERA);
}

DocumentPictureSettings documentPictureSettings = new DocumentPictureSettings.Builder()
        .specularAcceptableScore(15)
        .build();

documentPictureView.setDocumentPictureSettings(documentPictureSettings);

// Toggles displaying an aiming circle while searching for cards.
Boolean enableAimingCircle;

// Toggles displaying timer that shows seconds remaining for the validators to become max tolerant.
Boolean showTimer;

// Can be used for fine tuning the sensitivity of the specular validator. Value range 0-100. Default value is 50.
Integer specularAcceptableScore;

// Can be used for fine tuning the sensitivity of the document blur validator. Value range 0-100. Default value is 50.
Integer documentBlurAcceptableScore;

// The time delay for the blur validator to become max tolerant. Default value is 10.
Integer timeToBlurMaxToleranceInSeconds;

HologramSettings hologramSettings = new HologramSettings.Builder()
        .enableAimingCircle(true)
        .build();

hologramView.setHologramSettings(hologramSettings);

for (byte[] arr : result.getAuxiliaryImages()) {
    File file = new File("picture_" + System.currentTimeMillis() + ".jpg");
    try (FileOutputStream fos = new FileOutputStream(file)) {
        file.createNewFile();
        fos.write(arr);
    }
}

[
   {
      "checkName":"Angle",
      "isoTimeUtc":"2021-11-11T19:20:10.826Z",
      "parameter":"Up",
      "unixEpoch":"1636658410"
   },
   {
      "checkName":"Smile",
      "isoTimeUtc":"2021-11-11T19:20:15.146Z",
      "parameter":"",
      "unixEpoch":"1636658415"
   },
   {
      "checkName":"Angle",
      "isoTimeUtc":"2021-11-11T19:20:19.536Z",
      "parameter":"Right",
      "unixEpoch":"1636658419"
   },
   {
      "checkName":"Angle",
      "isoTimeUtc":"2021-11-11T19:20:23.787Z",
      "parameter":"Left",
      "unixEpoch":"1636658423"
   },
   {
      "checkName":"Angle",
      "isoTimeUtc":"2021-11-11T19:20:28.145Z",
      "parameter":"Down",
      "unixEpoch":"1636658428"
   }
]      

FaceLivenessSettings faceLivenessSettings = new FaceLivenessSettings.Builder()
        .enableLegacyMode(false) 
        .maxAuxiliaryImageSize(300)
        .build();

faceLivenessView.setFaceLivenessSettings(faceLivenessSettings);

// Use the pre-1.6.3 behavior: turn in any direction then smile. Default value is false.
boolean enableLegacyMode;

// Auxiliary images will be resized to fit into this size while preserving the aspect ratio. Default value is 300.
int maxAuxiliaryImageSize;

apiService.postDocumentPictureSample(documentCountry, documentRole, documentCode, documentPage, documentPicturePath).enqueue(new retrofit2.Callback<SampleJson>() {

    @Override
    public void onResponse(Call<SampleJson> call, Response<SampleJson> response) {
        String sampleId = response.body().getSampleId();
        Timber.i("sampleId: %s", sampleId);
    }

    @Override
    public void onFailure(Call<SampleJson> call, Throwable t) {
        Timber.e(t);
    }
}); 

apiService.getInvestigateSamples(sampleIds).enqueue(new Callback<InvestigationResponseJson>() {

    @Override
    public void onResponse(Call<InvestigationResponseJson> call, Response<InvestigationResponseJson> response) {
        Timber.i("investigationId: %s", response.body().getInvestigationId() );
        InvestigationResponseJson investigationResponse = response.body();
        showMinedData(investigationResponse);
        showValidatorResults(investigationResponse);
    }

    @Override
    public void onFailure(Call<InvestigationResponseJson> call, Throwable t) {
        Timber.e(t);
    }
});