Merge "DO NOT MERGE: Enable switch access api to activate/open files in DocsUI." into nyc-mr1-dev

import android.support.annotation.Nullable;

import android.support.design.widget.Snackbar;

import android.support.v13.view.DragStartHelper;

import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat;

import android.support.v4.view.accessibility.AccessibilityNodeInfoCompat.AccessibilityActionCompat;

import android.support.v7.widget.GridLayoutManager;

import android.support.v7.widget.GridLayoutManager.SpanSizeLookup;

import android.support.v7.widget.RecyclerView;

import android.support.v7.widget.RecyclerView.OnItemTouchListener;

import android.support.v7.widget.RecyclerView.Recycler;

import android.support.v7.widget.RecyclerView.RecyclerListener;

import android.support.v7.widget.RecyclerView.ViewHolder;

import android.text.BidiFormatter;

        mRecView.setAdapter(mAdapter);

        mLayout = new GridLayoutManager(getContext(), mColumnCount);

        // Switch Access Accessibility API needs an {@link AccessibilityDelegate} to know the proper

        // route when user selects an UI element. It usually guesses this if the element has an

        // {@link OnClickListener}, but since we do not have one for itemView, we will need to

        // manually route it to the right behavior. RecyclerView has its own AccessibilityDelegate,

        // and routes it to its LayoutManager; so we must override the LayoutManager's accessibility

        // methods to route clicks correctly.

        mLayout = new GridLayoutManager(getContext(), mColumnCount) {

            @Override

            public void onInitializeAccessibilityNodeInfoForItem(

                    RecyclerView.Recycler recycler, RecyclerView.State state,

                    View host, AccessibilityNodeInfoCompat info) {

                super.onInitializeAccessibilityNodeInfoForItem(recycler, state, host, info);

                info.addAction(AccessibilityActionCompat.ACTION_CLICK);

            }

            @Override

            public boolean performAccessibilityActionForItem(

                    RecyclerView.Recycler recycler, RecyclerView.State state, View view,

                    int action, Bundle args) {

                // We are only handling click events; route all other to default implementation

                if (action == AccessibilityNodeInfoCompat.ACTION_CLICK) {

                    RecyclerView.ViewHolder vh = mRecView.getChildViewHolder(view);

                    if (vh instanceof DocumentHolder) {

                        DocumentHolder dh = (DocumentHolder) vh;

                        if (dh.mEventListener != null) {

                            dh.mEventListener.onActivate(dh);

                            return true;

                        }

                    }

                }

                return super.performAccessibilityActionForItem(recycler, state, view, action,

                        args);

            }

        };

        SpanSizeLookup lookup = mAdapter.createSpanSizeLookup();

        if (lookup != null) {

            mLayout.setSpanSizeLookup(lookup);