Implement new keyboard settings UI.

Add enabled input method locales page
Add keyboard layout picker page
Add keyboard settings entry in BT device detail

Bug: 242680718
Test: local test
Change-Id: I07e068ecde553d394697b25cb573f806229f6f52

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

@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.settings.inputmethod;
+
+import android.content.Context;
+import android.view.View;
+import android.widget.ImageView;
+
+import androidx.preference.Preference;
+import androidx.preference.PreferenceViewHolder;
+
+import com.android.settings.R;
+
+public class KeyboardLayoutPreference extends Preference {
+
+    private ImageView mCheckIcon;
+    private boolean mIsMark;
+
+    public KeyboardLayoutPreference(Context context, String layoutName, boolean defaultMark) {
+        super(context);
+        setWidgetLayoutResource(R.layout.preference_check_icon);
+        setTitle(layoutName);
+        mIsMark = defaultMark;
+    }
+
+    @Override
+    public void onBindViewHolder(PreferenceViewHolder holder) {
+        super.onBindViewHolder(holder);
+        mCheckIcon = (ImageView) holder.findViewById(R.id.keyboard_check_icon);
+        setCheckMark(mIsMark);
+    }
+
+    public void setCheckMark(boolean isMark) {
+        if (mCheckIcon != null) {
+            mCheckIcon.setVisibility(isMark ? View.VISIBLE : View.INVISIBLE);
+            mIsMark = isMark;
+        }
+    }
+}