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How can i use canGoBack() on GeckoView?

below is sample default android webview canGoBack() implemention

public void onBackPressed() {
    if (webView.canGoBack()) {
        webView.goBack();
    } else {
        super.onBackPressed();
    }
}

on geckoview

You need to set a navigation delegate on the gecko session and use a global boolean to keep track of whether it can go back or not.

Java

private boolean canGoBack = false;
public class MainActivity extends AppCompatActivity {
   @Override
   protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       session.setNavigationDelegate(new GeckoSession.NavigationDelegate() {
                  @Override
                  public void onCanGoBack(@NonNull GeckoSession session, boolean canGoBack) {
                      MainActivity.this.canGoBack = canGoBack;
                  }
         });
   }
}

Kotlin

session.navigationDelegate = object : NavigationDelegate {
    override fun onCanGoBack(session: GeckoSession, canGoBack: Boolean) {
        // equivalent of webview.canGoBack
        this@MainActivity.canGoBack = canGoBack
    }
}