# How to Use the SDK

## Adding the SDK

### 1. Select "app" -> "libs" -> Right-click -> "Open in Finder"

![1756792711083](../media/1756792711083.png)

### 2. Select the downloaded "251gsdk.aar" file

  The "251gsdk.aar" file will appear under the "libs" folder of the project.

![1756792723629](../media/1756792723629.png)

![1756792728562](../media/1756792728562.png)

### 3. Double-click on "build.gradle"

  Add the library to the dependencies.
  Next, click "Sync Now" to synchronize.
 ![1756792736716](../media/1756792736716.png)

![1756792744952](../media/1756792744952.png)

### 4. When synchronization is successful, the following screen will appear

  This completes the SDK installation.
 ![1756792752285](../media/1756792752285.png)

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## Using the SDK

### The project needs to import the header file into the class that uses the SDK

![1756792794294](../media/1756792794294.png)

### Create an initialization object

![1756792800328](../media/1756792800328.png)

### Create and initialize the AsReaderEventListener object

Override the methods in the AsReaderEventListener interface.

 ![1756792805874](../media/1756792805874.png)

### Connect to the ASR-L251G

Note: Before connecting to the ASR-L251G, you must call the method "setEventListener(AsReaderEventListener listener)"

to pass the AsReaderEventListener object. This is used to obtain the connection status, execution status listeners, and data returned from the ASR-L251G.

![1756792816305](../media/1756792816305.png)

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## **Adding Project Permissions**

Before using the SDK, you must define project permissions in the AndroidManifest.xml file of the app.

![1756792841775](../media/1756792841775.png)