# Enabling the add friend option with the SDK

You can display an option to add the LINE Official Account as a friend when a user logs in to your app. This is called the **add friend option**. Developers can specify the LINE Official Account to be added as a friend.

Before getting started with the configuration, see [Add a LINE Official Account as a friend when logged in (add friend option)](https://developers.line.biz/en/docs/line-login/link-a-bot/) in the LINE Login documentation to understand the add friend option and the following specifics:

- Linking a LINE Official Account with your channel on the LINE Developers Console
- The bot prompt parameter sent to the LINE Platform and its behavior
- The friendship status flag returned from the LINE Platform and its meaning

This topic explains how to enable these features related to the add friend option with the LINE SDK:

- [Setting the bot prompt parameter in the login request](https://developers.line.biz/en/docs/line-login-sdks/android-sdk/link-a-bot/#bot_prompt)
- [Checking the friendship status between the user and the LINE Official Account](https://developers.line.biz/en/docs/line-login-sdks/android-sdk/link-a-bot/#get_friendship)

## Setting the bot prompt parameter in the login request 

The following sample code shows how to set the `botPrompt` parameter when using the `LoginButton` widget.

```java
...
LoginButton loginButton = rootView.findViewById(R.id.line_login_btn);

loginButton.setAuthenticationParams(new LineAuthenticationParams.Builder()
        .scopes(Arrays.asList(Scope.PROFILE))
        .botPrompt(BotPrompt.normal) // configure it here
        .build()
);
...
```

The following sample code shows how to set the `botPrompt` parameter when using the `LoginApi.getLoginIntent()` method.

```java
Intent loginIntent = LineLoginApi.getLoginIntent(
    view.getContext(),
    Constants.CHANNEL_ID,
    new LineAuthenticationParams.Builder()
            .scopes(Arrays.asList(Scope.PROFILE))
            .botPrompt(BotPrompt.normal) // configure it here
            .build());

startActivityForResult(loginIntent, REQUEST_CODE);
```

For more information about the parameter values, see [LineAuthenticationParams.BotPrompt](https://developers.line.biz/en/reference/android-sdk/reference/com/linecorp/linesdk/auth/LineAuthenticationParams.BotPrompt.html) in the LINE SDK for Android reference.

## Checking the friendship status between the user and the LINE Official Account 

You can check the friendship status between the user and the LINE Official Account using the following methods.

- [Check the `LineLoginResult` object in the login response](https://developers.line.biz/en/docs/line-login-sdks/android-sdk/link-a-bot/#use-friendship_status_changed): This method checks whether the friendship status has changed during login.
- [Use LINE Login to get friendship status](https://developers.line.biz/en/docs/line-login-sdks/android-sdk/link-a-bot/#use-line-login-api): This method gets the friendship status between the user and the LINE Official Account.

### Check the `LineLoginResult` object in the login response 

After successful login, the `LineLoginResult` object contains a boolean value that indicates whether the friendship status has changed. You can get the value with the `getFriendshipStatusChanged()` method.

The following conditions must be met to get the friendship status flag:

- The `botPrompt` parameter is specified with the `LineAuthenticationParams` object in the login request.
- The consent screen with the option to add your LINE Official Account as a friend is displayed to the user.

The following sample code shows how to get the friendship status from the `LineLoginResult` object.

```java
public void onActivityResult(int requestCode, int resultCode, Intent data) {
    ...

    LineLoginResult result = LineLoginApi.getLoginResultFromIntent(data);

    boolean friendshipStatusChanged = result.getFriendshipStatusChanged();

    ...
}
```

For more information about the return values, see [getFriendshipStatusChanged()](https://developers.line.biz/en/reference/android-sdk/reference/com/linecorp/linesdk/auth/LineLoginResult.html#getFriendshipStatusChanged()) in the LINE SDK for Android reference.

### Use LINE Login to get friendship status 

Call the `LineApiClient.getFriendshipStatus()` method after the user has logged in to your app and an access token has been returned.

```
boolean isFriendToTheBot = lineApiClient.getFriendshipStatus();
```

For more information about the return values, see [getFriendshipStatus()](https://developers.line.biz/en/reference/android-sdk/reference/com/linecorp/linesdk/api/LineApiClient.html#getFriendshipStatus()) in the LINE SDK for Android reference.