# 3. Initialization

Initialization sets up internal SDK components to allow the creation of a Sentiance user on the device, and perform detections in the background.

Only a limited set of SDK functions are allowed to be invoked before initializing the SDK.

### iOS

The correct way to natively initialize on iOS is to do it inside the `application:didFinishLaunchingWithOptions:` method of the `AppDelegate` class.

{% code title="AppDelegate.m" %}

```swift
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    SENTInitializationResult *result = [[[RNSentianceHelper alloc] init] initializeSDKWithLaunchOptions:launchOptions];
    return YES;
}
```

{% endcode %}

Initialization will normally succeed unless an unexpected error or exception is encountered. In case of failure, you can check the reason via the returned result.

```swift
if (result.isSuccessful) {
    NSLog(@"Initialization succeeded");
}
else {
    NSLog(@"Initialization failed with reason %lu", result.failureReason);
}
```

### Android

Add the following code inside the `onCreate()` method of your `Application` class:

```java
...
import com.sentiance.sdk.init.InitializationResult;
import com.sentiance.react.bridge.core.SentianceHelper;

public class MainApplication extends Application implements ReactApplication {

    @Override
    public void onCreate() {
        super.onCreate();
        ...
        
        SentianceHelper sentianceHelper = SentianceHelper.getInstance(this);
        InitializationResult result = sentianceHelper.initializeSDK();
    }

  ...
}
```

Initialization will normally succeed, unless an unexpected error or exception is encountered. In case of failure, you can check the reason via the returned result.

```java
if (result.isSuccessful()) {
    Log.d(TAG, "Initialization succeeded");
} else {
    Log.e(TAG, "Initialization failed with reason " + result.getFailureReason().getName(), result.getThrowable());
}
```


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.sentiance.com/a-complete-integration/react-native-quick-start/initialization.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.