Conditionally add tail button pref

- The connected device settings shouldn't show the tail button pref
  setting if the input device doesn't support it.

Bug: 293472525
Test: atest StylusDevicesControllerTest
Flag: NONE
Change-Id: I50ab43e971b0dd8530a5bdab8544a46e889366ee

src/com/android/settings/connecteddevice/stylus/StylusDevicesController.java

@@ -32,6 +32,7 @@ import android.provider.Settings.Secure;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.InputDevice;
+import android.view.KeyEvent;
 import android.view.inputmethod.InputMethodInfo;
 import android.view.inputmethod.InputMethodManager;
 
@@ -107,6 +108,12 @@ public class StylusDevicesController extends AbstractPreferenceController implem
             return null;
         }
 
+        boolean doesStylusSupportTailButton = mInputDevice.hasKeys(
+                KeyEvent.KEYCODE_STYLUS_BUTTON_TAIL)[0];
+        if (!doesStylusSupportTailButton) {
+            return null;
+        }
+
         Preference pref = preference == null ? new Preference(mContext) : preference;
         pref.setKey(KEY_DEFAULT_NOTES);
         pref.setTitle(mContext.getString(R.string.stylus_default_notes_app));