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));

tests/robotests/src/com/android/settings/connecteddevice/stylus/StylusDevicesControllerTest.java

@@ -16,6 +16,8 @@
 
 package com.android.settings.connecteddevice.stylus;
 
+import static android.view.KeyEvent.KEYCODE_STYLUS_BUTTON_TAIL;
+
 import static com.google.common.truth.Truth.assertThat;
 
 import static org.junit.Assert.assertEquals;
@@ -139,6 +141,8 @@ public class StylusDevicesControllerTest {
                 .setSources(InputDevice.SOURCE_STYLUS)
                 .build());
         when(mInputDevice.getBluetoothAddress()).thenReturn("SOME:ADDRESS");
+        when(mInputDevice.hasKeys(KEYCODE_STYLUS_BUTTON_TAIL)).thenReturn(
+                new boolean[]{true});
 
         mController = new StylusDevicesController(mContext, mInputDevice, null, mLifecycle);
     }
@@ -220,6 +224,28 @@ public class StylusDevicesControllerTest {
         assertThat(mPreferenceContainer.getPreferenceCount()).isEqualTo(3);
     }
 
+    @Test
+    public void usiStylusInputDevice_doesntSupportTailButton_tailButtonPreferenceNotShown() {
+        when(mInputDevice.hasKeys(KEYCODE_STYLUS_BUTTON_TAIL)).thenReturn(new boolean[]{false});
+        when(mBluetoothDevice.getMetadata(BluetoothDevice.METADATA_DEVICE_TYPE)).thenReturn(
+                BluetoothDevice.DEVICE_TYPE_WATCH.getBytes());
+        StylusDevicesController controller = new StylusDevicesController(
+                mContext, mInputDevice, mCachedBluetoothDevice, mLifecycle
+        );
+
+        showScreen(controller);
+        Preference handwritingPref = mPreferenceContainer.getPreference(0);
+        Preference buttonPref = mPreferenceContainer.getPreference(1);
+
+        assertThat(mPreferenceContainer.getPreferenceCount()).isEqualTo(2);
+        assertThat(handwritingPref.getTitle().toString()).isEqualTo(
+                mContext.getString(R.string.stylus_textfield_handwriting));
+        assertThat(handwritingPref.isVisible()).isTrue();
+        assertThat(buttonPref.getTitle().toString()).isEqualTo(
+                mContext.getString(R.string.stylus_ignore_button));
+        assertThat(buttonPref.isVisible()).isTrue();
+    }
+
     @Test
     public void btStylusInputDevice_showsAllPreferences() {
         showScreen(mController);