KeyboardSettings: Add a RemotePreference for device-specific panel

Allow devices to provide advanced keyboard settings.

Unfortunatelly this can't be done with existing IA settings,
so use the RemotePreference API to allow the external app
to update the view. The action for this is:

     "org.lineageos.settings.device.ADVANCED_KEYBOARD_SETTINGS"

Change-Id: I1c46d3568c4d5bfc78e1cbae033071c7641fdf29

res/values/cm_strings.xml

@@ -15,6 +15,10 @@
      limitations under the License.
 -->
 <resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">
+    <!-- Advanced keyboard settings -->
+    <string name="keyboard_extras_title">Extras</string>
+    <string name="advanced_keyboard_settings_title">Advanced settings</string>
+
     <!-- Android debugging as root -->
     <string name="adb_enable_root">Rooted debugging</string>
     <string name="adb_enable_summary_root">Allow running Android debugging as root</string>

res/xml/physical_keyboard_settings.xml

@@ -15,6 +15,7 @@
 -->
 <PreferenceScreen
     xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:settings="http://schemas.android.com/apk/res-auto"
     android:title="@string/physical_keyboard_title">
     <!-- Additional preference screens are inserted here programmatically
          with low order values to set the key map of each attached keyboard. -->
@@ -60,4 +61,20 @@
             android:defaultValue="false" />
 
     </PreferenceCategory>
+
+    <!-- Device-specific keyboard settings. -->
+    <PreferenceCategory
+        android:key="keyboard_extras_category"
+        android:title="@string/keyboard_extras_title" >
+
+        <lineageos.preference.RemotePreference
+            android:key="advanced_keyboard_settings"
+            android:title="@string/advanced_keyboard_settings_title"
+            settings:requiresAction="org.lineageos.settings.device.ADVANCED_KEYBOARD_SETTINGS">
+            <intent
+                android:action="org.lineageos.settings.device.ADVANCED_KEYBOARD_SETTINGS" />
+        </lineageos.preference.RemotePreference>
+
+    </PreferenceCategory>
+
 </PreferenceScreen>

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

@@ -70,6 +70,7 @@ public final class PhysicalKeyboardFragment extends SettingsPreferenceFragment
 
     private static final String KEYBOARD_OPTIONS_CATEGORY = "keyboard_options_category";
     private static final String KEYBOARD_A11Y_CATEGORY = "keyboard_a11y_category";
+    private static final String KEYBOARD_EXTRAS_CATEGORY = "keyboard_extras_category";
     private static final String SHOW_VIRTUAL_KEYBOARD_SWITCH = "show_virtual_keyboard_switch";
     private static final String ACCESSIBILITY_BOUNCE_KEYS = "accessibility_bounce_keys";
     private static final String ACCESSIBILITY_SLOW_KEYS = "accessibility_slow_keys";
@@ -99,6 +100,8 @@ public final class PhysicalKeyboardFragment extends SettingsPreferenceFragment
     private PreferenceCategory mKeyboardAssistanceCategory;
     @Nullable
     private PreferenceCategory mKeyboardA11yCategory = null;
+    @NonNull
+    private PreferenceCategory mKeyboardExtrasCategory = null;
     @Nullable
     private TwoStatePreference mShowVirtualKeyboardSwitch = null;
     @Nullable
@@ -129,6 +132,8 @@ public void onCreatePreferences(Bundle bundle, String s) {
         mImm = Preconditions.checkNotNull(activity.getSystemService(InputMethodManager.class));
         mKeyboardAssistanceCategory = Preconditions.checkNotNull(
                 findPreference(KEYBOARD_OPTIONS_CATEGORY));
+        mKeyboardExtrasCategory = Preconditions.checkNotNull(
+                findPreference(KEYBOARD_EXTRAS_CATEGORY));
         mShowVirtualKeyboardSwitch = Objects.requireNonNull(
                 mKeyboardAssistanceCategory.findPreference(SHOW_VIRTUAL_KEYBOARD_SWITCH));
 
@@ -311,6 +316,8 @@ private void updateHardKeyboards(@NonNull List<HardKeyboardDeviceInfo> newHardKe
         }
         mKeyboardAssistanceCategory.setOrder(1);
         preferenceScreen.addPreference(mKeyboardAssistanceCategory);
+        mKeyboardExtrasCategory.setOrder(99);
+        preferenceScreen.addPreference(mKeyboardExtrasCategory);
         if (mSupportsFirmwareUpdate) {
             mFeatureProvider.addFirmwareUpdateCategory(getPrefContext(), preferenceScreen);
         }