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User Guide for Android Edition

System Requirements

Operating systems:
- Supported OS: Android 5 or higher
- Supported ABI: armeabi-v7a/arm64-v8a

Installation

Option 1: Download from website

To install Dynamsoft Barcode Reader for Android on your development machine, you can download the SDK from the Dynamsoft website and unzip dbr-android-{version-number}.zip.

After decompression, you can find samples in the DBRSamples folder under the dbr-android-{version-number} folder.

Option 2: Build with Maven

You can add Dynamsoft Barcode Reader like below:

Add download URL in your project’s build.gradle.

 allprojects {
   repositories {
      google()
      jcenter()
      maven {
         url "http://download2.dynamsoft.com/maven/dbr/aar"
      }
   }
}

implement Dynamsoft Barcode Reader at dependencies in your module’s build.gradle.
```
implementation 'com.dynamsoft:dynamsoftbarcodereader:{version-number}@aar'
```

Getting Started: HelloWorld

Create a new Android project in Android Studio.
Import the DynamsoftBarcodeReaderAndroid.aar package into the new project. You can manually import the .aar file or use maven import.

To manually import the .aar :

i. Decompress the dbr-android-{version number}.zip file and you will find DynamsoftBarcodeReaderAndroid.aar in the decompressed folder. ii. Put the .aar file under the directory libs in the project. iii. In the project, open build.gradle(Module: app) and add the following code:
```
   repositories {
      flatDir {
         dirs 'libs'
      }
   }
```
ii. Add .aar reference in the dependencies:
```
   implementation(name: 'DynamsoftBarcodeReaderAndroid', ext: 'aar')
```
iii. Click Sync Now. After the synchronization completes, DynamsoftBarcodeReaderAndroid.aar is added to the project.

Or you can use maven import the .aar file into the project.

i. In the new project, open build.gradle(module:app) and add the following code:
```
   allprojects {
      repositories {
         maven {
            url "http://download.dynamsoft.com/maven/dbr/aar"
         }
      }
   }
```
ii. Then add .aar reference in the dependencies as below:
```
   implementation 'com.dynamsoft:dynamsoftbarcodereader:{version number}@aar'
```
iii. Click Sync Now. After the synchronization completes, DynamsoftBarcodeReaderAndroid.aar is added to the project.

Add the following code to initiate and use the Dynamsoft Barcode Reader SDK.

import com.dynamsoft.barcode.BarcodeReader;
import com.dynamsoft.barcode.TextResult;
import android.util.Log;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      try {
         BarcodeReader dbr = new BarcodeReader("your license here");
         // Note: If you do not have a valid license for the SDK, some characters of the barcode results will be replaced with "***".
         // Leave the template name empty ("") will use the settings from PublicRuntimeSettings.
         TextResult[] results = dbr.decodeFile("put your file path here", "");
         if (results.length > 0) {
            String resultContent = "Found " + results.length + " barcode(s):\n";
            for (int i = 0; i < results.length; i++) {
               resultContent += results[i].barcodeText + "\n";
            }
            Log.i("DBR", resultContent);
         } else {
            Log.i("DBR", "No barcode found");
         }
      } catch (Exception ex) {
         ex.printStackTrace();
      }
   }
}

Run the project.

Decoding Methods

The SDK provides multiple decoding methods that support reading barcodes from different sources, including static images, video stream, files in memory, base64 string, bitmap, etc. Here is a list of all decoding methods:

DecodeFile: Reads barcodes from a specified file (BMP, JPEG, PNG, GIF, TIFF or PDF).
DecodeBase64String: Reads barcodes from a base64 encoded string of a file.
DecodeBitmap: Reads barcodes from a bitmap. When handling multi-page images, it will only decode the current page.
DecodeBuffer: Reads barcodes from raw buffer.
DecodeFileInMemory: Decodes barcodes from an image file in memory.

You can find more samples in more programming languages at Code Gallery or Github Repositories.

Barcode Reading Settings

Calling the decoding methods directly will use the default scanning modes and it will satisfy most of the needs. The SDK also allows you to adjust the scanning settings to optimize the scanning performance for different usage scenarios.

There are two ways to change the barcode reading settings - using the PublicRuntimeSettings class or template. For new developers, We recommend you to start with the PublicRuntimeSettings class; For those who are experienced with the SDK, you may use a template which is more flexible and easier to update.

Use PublicRuntimeSettings class to Change Settings
Use A Template to Change Settings

Use `PublicRuntimeSettings` class to Change Settings

Here are some common scanning settings you might find helpful:

Specify Barcode Type to Read
Specify Maximum Barcode Count
Specify a Scan Region

For more scanning settings guide, check out the How To section.

Specify Barcode Type to Read

By default, the SDK will read all the supported barcode formats except Postal Codes and Dotcode from the image. (See Product Overview for the full supported barcode list.)

If your full license only covers some barcode formats, you can use BarcodeFormatIds and BarcodeFormatIds_2 to specify the barcode format(s). Check out BarcodeFormat and BarcodeFormat_2.

For example, to enable only 1D barcode reading, you can use the following code:

BarcodeReader dbr = new BarcodeReader();
dbr.initLicense("<Put your license key here>"); //Replace "<Put your license key here>" with your own license
// Set barcodeFromatIds via PublicRuntimeSettings instance and update it to BarcodeReader instance
PublicRuntimeSettings runtimeSettings = dbr.getRuntimeSettings();
runtimeSettings.barcodeFormatIds = 0x7FF;// OneD barcode
dbr.updateRuntimeSettings(runtimeSettings);
// Replace "<Put the path of your file here>" with your own file path
TextResult[] result = dbr.decodeFile("<Put your file path here>","");

Specify maximum barcode count

By default, the SDK will read as many barcodes as it can. To increase the recognition efficiency, you can use expectedBarcodesCount to specify the maximum number of barcodes to recognize according to your scenario.

BarcodeReader dbr = new BarcodeReader();
dbr.initLicense("<Put your license key here>"); //Replace "<Put your license key here>" with your own license
PublicRuntimeSettings rts = dbr.getRuntimeSettings();
rts.expectedBarcodesCount = 10;
dbr.updateRuntimeSettings(rts);
//Replace "<Put the path of your file here>" with your own file path
TextResult[] result = dbr.decodeFile("<Put your file path here>","");
reader.destroy();

Specify a scan region

By default, the barcode reader will search the whole image for barcodes. This can lead to poor performance especially when dealing with high-resolution images. You can speed up the recognition process by restricting the scanning region.

To specify a region, you will need to define an area. The following code shows how to create a template string and define the region.

BarcodeReader dbr = new BarcodeReader();
dbr.initLicense("<Put your license key here>"); //Replace "<Put your license key here>" with your own license
PublicRuntimeSettings runtimeSettings = dbr.getRuntimeSettings();
runtimeSettings.region.regionBottom = 100;
runtimeSettings.region.regionLeft = 0;
runtimeSettings.region.regionRight = 50;
runtimeSettings.region.regionTop = 0;
runtimeSettings.region.regionMeasuredByPercentage = 1; //The region is determined by percentage
dbr.updateRuntimeSettings(runtimeSettings);
//Replace "<Put the path of your file here>" with your own file path
TextResult[] result = dbr.decodeFile("<Put your file path here>","");
reader.destroy();

Use A Template to Change Settings

Besides the option of using the PublicRuntimeSettings class, the SDK also provides initRuntimeSettingsWithString and initRuntimeSettingsWithFile APIs that enable you to use a template to control all the runtime settings. With a template, instead of writing many codes to modify the settings, you can manage all the runtime settings in a JSON file/string.

BarcodeReader dbr = new BarcodeReader();
dbr.initLicense("<Put your license key here>"); //Replace "<Put your license key here>" with your own license
br.initRuntimeSettingsWithFile("<put your json file here>", EnumConflictMode.CM_OVERWRITE);
//Replace "<Put the path of your file here>" with your own file path
TextResult[] result = dbr.decodeFile("<Put your file path here>","");
reader.destroy();

Below is a template for your reference. To learn more about the APIs, you can check out PublicRuntimeSettings Class.

{
   "ImageParameter" : {
      "BarcodeFormatIds" : [ "BF_ALL" ],
      "BinarizationModes" : [
         {
            "BlockSizeX" : 0,
            "BlockSizeY" : 0,
            "EnableFillBinaryVacancy" : 1,
            "ImagePreprocessingModesIndex" : -1,
            "Mode" : "BM_LOCAL_BLOCK",
            "ThreshValueCoefficient" : 10
         }
      ],
      "DeblurLevel" : 9,
      "Description" : "",
      "ExpectedBarcodesCount" : 0,
      "GrayscaleTransformationModes" : [
         {
            "Mode" : "GTM_ORIGINAL"
         }
      ],
      "ImagePreprocessingModes" : [
         {
            "Mode" : "IPM_GENERAL"
         }
      ],
      "IntermediateResultSavingMode" : {
         "Mode" : "IRSM_MEMORY"
      },
      "IntermediateResultTypes" : [ "IRT_NO_RESULT" ],
      "MaxAlgorithmThreadCount" : 4,
      "Name" : "runtimesettings",
      "PDFRasterDPI" : 300,
      "Pages" : "",
      "RegionDefinitionNameArray" : null,
      "RegionPredetectionModes" : [
         {
            "Mode" : "RPM_GENERAL"
         }
      ],
      "ResultCoordinateType" : "RCT_PIXEL",
      "ScaleDownThreshold" : 2300,
      "TerminatePhase" : "TP_BARCODE_RECOGNIZED",
      "TextFilterModes" : [
         {
            "MinImageDimension" : 65536,
            "Mode" : "TFM_GENERAL_CONTOUR",
            "Sensitivity" : 0
         }
      ],
      "TextResultOrderModes" : [
         {
            "Mode" : "TROM_CONFIDENCE"
         },
         {
            "Mode" : "TROM_POSITION"
         },
         {
            "Mode" : "TROM_FORMAT"
         }
      ],
      "TextureDetectionModes" : [
         {
            "Mode" : "TDM_GENERAL_WIDTH_CONCENTRATION",
            "Sensitivity" : 5
         }
      ],
      "Timeout" : 10000
   },
   "Version" : "3.0"
}