Implement multiple locales and sublocales in Settings

Does drag-and-drop reordering, supports adding / removing locales,
suggestions, search, removes locales already selected in the
user preferences.

Bug: 25800339
Change-Id: Iffe7b9810c77ec93a84d848ab20b2ba405249676

src/com/android/settings/localepicker/LocaleDragAndDropAdapter.java

@@ -0,0 +1,203 @@
+/*
+ * Copyright (C) 2016 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.localepicker;
+
+import android.content.Context;
+import android.support.v4.view.MotionEventCompat;
+import android.support.v7.widget.RecyclerView;
+import android.support.v7.widget.helper.ItemTouchHelper;
+import android.util.LocaleList;
+import android.view.LayoutInflater;
+import android.view.MotionEvent;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.CompoundButton;
+
+import com.android.settings.R;
+
+import com.android.internal.app.LocalePicker;
+import com.android.internal.app.LocaleStore;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Locale;
+
+
+class LocaleDragAndDropAdapter
+        extends RecyclerView.Adapter<LocaleDragAndDropAdapter.CustomViewHolder> {
+
+    private final Context mContext;
+    private final List<LocaleStore.LocaleInfo> mFeedItemList;
+    private final ItemTouchHelper mItemTouchHelper;
+    private boolean mRemoveMode = false;
+    private boolean mDragEnabled = true;
+
+    class CustomViewHolder extends RecyclerView.ViewHolder implements View.OnTouchListener {
+        private final LocaleDragCell mLocaleDragCell;
+
+        public CustomViewHolder(LocaleDragCell view) {
+            super(view);
+            mLocaleDragCell = view;
+            mLocaleDragCell.getDragHandle().setOnTouchListener(this);
+            mLocaleDragCell.getTextLabel().setOnTouchListener(this);
+            mLocaleDragCell.getTranslateableLabel().setOnTouchListener(this);
+        }
+
+        public LocaleDragCell getLocaleDragCell() {
+            return mLocaleDragCell;
+        }
+
+        @Override
+        public boolean onTouch(View v, MotionEvent event) {
+            if (mDragEnabled) {
+                switch (MotionEventCompat.getActionMasked(event)) {
+                    case MotionEvent.ACTION_DOWN:
+                        mItemTouchHelper.startDrag(this);
+                }
+            }
+            return false;
+        }
+    }
+
+    public LocaleDragAndDropAdapter(Context context, List<LocaleStore.LocaleInfo> feedItemList) {
+        this.mFeedItemList = feedItemList;
+
+        this.mContext = context;
+        this.mItemTouchHelper = new ItemTouchHelper(new ItemTouchHelper.SimpleCallback(
+                ItemTouchHelper.UP | ItemTouchHelper.DOWN, 0 /* no swipe */) {
+
+            @Override
+            public boolean onMove(RecyclerView view, RecyclerView.ViewHolder source,
+                    RecyclerView.ViewHolder target) {
+                onItemMove(source.getAdapterPosition(), target.getAdapterPosition());
+                return true;
+            }
+
+            @Override
+            public void onSwiped(RecyclerView.ViewHolder viewHolder, int i) {
+                // Swipe is disabled, this is intentionally empty.
+            }
+        });
+    }
+
+    public void setRecyclerView(RecyclerView rv) {
+        mItemTouchHelper.attachToRecyclerView(rv);
+    }
+
+    @Override
+    public CustomViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
+        final LocaleDragCell item = (LocaleDragCell) LayoutInflater.from(mContext)
+                .inflate(R.layout.locale_drag_cell, viewGroup, false);
+        return new CustomViewHolder(item);
+    }
+
+    @Override
+    public void onBindViewHolder(final CustomViewHolder holder, int i) {
+        final LocaleStore.LocaleInfo feedItem = mFeedItemList.get(i);
+        final LocaleDragCell dragCell = holder.getLocaleDragCell();
+
+        String label = feedItem.getFullNameNative();
+        dragCell.setLabel(label);
+        dragCell.setLocalized(feedItem.isTranslated());
+        dragCell.setMiniLabel(Integer.toString(i + 1));
+        dragCell.setShowCheckbox(mRemoveMode);
+        dragCell.setShowMiniLabel(!mRemoveMode);
+        dragCell.setShowHandle(!mRemoveMode);
+        dragCell.setChecked(false);
+        dragCell.setTag(feedItem);
+        dragCell.getCheckbox()
+                .setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
+                    @Override
+                    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
+                        LocaleStore.LocaleInfo feedItem =
+                                (LocaleStore.LocaleInfo) holder.getLocaleDragCell().getTag();
+                        feedItem.setChecked(isChecked);
+                    }
+                });
+    }
+
+    @Override
+    public int getItemCount() {
+        int itemCount = (null != mFeedItemList ? mFeedItemList.size() : 0);
+        if (itemCount < 2 || mRemoveMode) {
+            setDragEnabled(false);
+        } else {
+            setDragEnabled(true);
+        }
+        return itemCount;
+    }
+
+    private void onItemMove(int fromPosition, int toPosition) {
+        Collections.swap(mFeedItemList, fromPosition, toPosition);
+        notifyItemChanged(fromPosition); // to update the numbers
+        notifyItemChanged(toPosition);
+        notifyItemMoved(fromPosition, toPosition);
+    }
+
+    void setRemoveMode(boolean removeMode) {
+        mRemoveMode = removeMode;
+        int itemCount = mFeedItemList.size();
+        for (int i = 0; i < itemCount; i++) {
+            mFeedItemList.get(i).setChecked(false);
+            notifyItemChanged(i);
+        }
+    }
+
+    void removeChecked() {
+        int itemCount = mFeedItemList.size();
+        for (int i = itemCount - 1; i >= 0; i--) {
+            if (mFeedItemList.get(i).getChecked()) {
+                mFeedItemList.remove(i);
+            }
+        }
+        notifyDataSetChanged();
+        doTheUpdate();
+    }
+
+    int getCheckedCount() {
+        int result = 0;
+        for (LocaleStore.LocaleInfo li : mFeedItemList) {
+            if (li.getChecked()) {
+                result++;
+            }
+        }
+        return result;
+    }
+
+    void addLocale(LocaleStore.LocaleInfo li) {
+        mFeedItemList.add(li);
+        notifyItemInserted(mFeedItemList.size() - 1);
+        doTheUpdate();
+    }
+
+    public void doTheUpdate() {
+        int count = mFeedItemList.size();
+        Locale[] newList = new Locale[count];
+
+        for (int i = 0; i < count; i++) {
+            LocaleStore.LocaleInfo li = mFeedItemList.get(i);
+            newList[i] = li.getLocale();
+        }
+
+        LocaleList ll = new LocaleList(newList);
+        LocalePicker.updateLocales(ll);
+    }
+
+    private void setDragEnabled(boolean enabled) {
+        mDragEnabled = enabled;
+    }
+}