Set preference visible to false when there is no keyboard.

1. Physical keyboard settings should only show up if at least one PK is connected.
2. Update tests.
3. Fix NullPointerException.

Bug: 269983475
Bug: 270109384
Bug: 271357910
Test: atest and manual
Change-Id: If7798587fb386dbf669fc249cab304d91a26879b

src/com/android/settings/inputmethod/KeyboardLayoutPickerController.java

@@ -21,7 +21,6 @@ import android.content.Context;
 import android.hardware.input.InputDeviceIdentifier;
 import android.hardware.input.InputManager;
 import android.hardware.input.KeyboardLayout;
-import android.view.InputDevice;
 
 import androidx.fragment.app.Fragment;
 import androidx.preference.Preference;
@@ -37,7 +36,6 @@ import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Map;
 
-
 public class KeyboardLayoutPickerController extends BasePreferenceController implements
         InputManager.InputDeviceListener, LifecycleObserver, OnStart, OnStop {
 
@@ -68,15 +66,12 @@ public class KeyboardLayoutPickerController extends BasePreferenceController imp
     @Override
     public void onStart() {
         mIm.registerInputDeviceListener(this, null);
-
-        final InputDevice inputDevice =
-                mIm.getInputDeviceByDescriptor(mInputDeviceIdentifier.getDescriptor());
-        if (inputDevice == null) {
-            mParent.getActivity().finish();
+        if (mInputDeviceIdentifier == null
+                || NewKeyboardSettingsUtils.getInputDevice(mIm, mInputDeviceIdentifier) == null) {
             return;
         }
-        mInputDeviceId = inputDevice.getId();
-
+        mInputDeviceId =
+                NewKeyboardSettingsUtils.getInputDevice(mIm, mInputDeviceIdentifier).getId();
         updateCheckedState();
     }
 
@@ -150,6 +145,9 @@ public class KeyboardLayoutPickerController extends BasePreferenceController imp
     }
 
     private void createPreferenceHierarchy() {
+        if (mKeyboardLayouts == null) {
+            return;
+        }
         for (KeyboardLayout layout : mKeyboardLayouts) {
             final SwitchPreference pref = new SwitchPreference(mScreen.getContext());
             pref.setTitle(layout.getLabel());