Gluon Android and iOS Keyboardservice implementation - javafx

Question

We are working on a GluonMobile App and the keyboard on Android an iOS is only showing up once, also it is hiding TextFields that are near the bottom of the screen itself.
We wanted to implement the solution provided here:
How to make the SoftKeyboard show up again
However, after adding all the necessary classes we are not able to deploy it, we get the following errors:
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:3: error: package android.graphics does not exist
import android.graphics.Rect;
^
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:4: error: package android.view does not exist
import android.view.ViewTreeObserver;
^
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:5: error: package android.view.inputmethod does not exist
import android.view.inputmethod.InputMethodManager;
^
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:13: error: package javafxports.android does not exist
import javafxports.android.FXActivity;
^
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:19: error: cannot find symbol
private final InputMethodManager imm;
^
symbol: class InputMethodManager
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:21: error: cannot find symbol
private Rect currentBounds;
^
symbol: class Rect
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:24: error: package ViewTreeObserver does not exist
private ViewTreeObserver.OnGlobalLayoutListener layoutListener;
^
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:50: error: package ViewTreeObserver does not exist
private ViewTreeObserver.OnGlobalLayoutListener layoutListener(DoubleProperty height) {
^
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:17: error: cannot find symbol
private static final float SCALE = FXActivity.getInstance().getResources().getDisplayMetrics().density;
^
symbol: variable FXActivity
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:29: error: cannot find symbol
imm = (InputMethodManager) FXActivity.getInstance().getSystemService(FXActivity.INPUT_METHOD_SERVICE);
^
symbol: class InputMethodManager
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:29: error: cannot find symbol
imm = (InputMethodManager) FXActivity.getInstance().getSystemService(FXActivity.INPUT_METHOD_SERVICE);
^
symbol: variable FXActivity
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:29: error: cannot find symbol
imm = (InputMethodManager) FXActivity.getInstance().getSystemService(FXActivity.INPUT_METHOD_SERVICE);
^
symbol: variable FXActivity
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:35: error: cannot find symbol
currentBounds = new Rect();
^
symbol: class Rect
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:42: error: cannot find symbol
FXActivity.getViewGroup().getViewTreeObserver().addOnGlobalLayoutListener(layoutListener);
^
symbol: variable FXActivity
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:45: error: cannot find symbol
l.addListener(LifecycleEvent.RESUME, () -> FXActivity.getViewGroup().getViewTreeObserver().addOnGlobalLayoutListener(layoutListener));
^
symbol: variable FXActivity
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:46: error: cannot find symbol
l.addListener(LifecycleEvent.PAUSE, () -> FXActivity.getViewGroup().getViewTreeObserver().removeOnGlobalLayoutListener(layoutListener));
^
symbol: variable FXActivity
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:55: error: cannot find symbol
FXActivity.getViewGroup().getRootView().getWindowVisibleDisplayFrame(currentBounds);
^
symbol: variable FXActivity
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:72: error: cannot find symbol
imm.toggleSoftInput(InputMethodManager.SHOW_IMPLICIT, 0);
^
symbol: variable InputMethodManager
location: class AndroidKeyboardService
C:\GluonApp\src\main\java\com\gluonhq\charm\down\plugins\android\AndroidKeyboardService.java:79: error: cannot find symbol
imm.toggleSoftInput(0, InputMethodManager.HIDE_IMPLICIT_ONLY);
^
symbol: variable InputMethodManager
location: class AndroidKeyboardService
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
19 errors
:compileJava FAILED
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':compileJava'.
> Compilation failed; see the compiler error output for details.
* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.
BUILD FAILED
What would the imports be or how can we successfully deploy it?