[Android History] Add Android history manager UI and bridge

chrome/android/java/src/org/chromium/chrome/browser/history/HistoryAdapter.java

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.chrome.browser.history;
+
+import android.support.v7.widget.RecyclerView.ViewHolder;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import org.chromium.base.Callback;
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.widget.DateDividedAdapter;
+import org.chromium.chrome.browser.widget.selection.SelectableItemViewHolder;
+import org.chromium.chrome.browser.widget.selection.SelectionDelegate;
+
+import java.util.List;
+
+/**
+ * Bridges the user's browsing history and the UI used to display it.
+ */
+public class HistoryAdapter extends DateDividedAdapter {
+    private static final String EMPTY_QUERY = "";
+
+    private final SelectionDelegate<HistoryItem> mSelectionDelegate;
+    private final BrowsingHistoryBridge mBridge;
+
+    private boolean mDestroyed;
+
+    public HistoryAdapter(SelectionDelegate<HistoryItem> delegate) {
+        setHasStableIds(true);
+        mSelectionDelegate = delegate;
+        mBridge = new BrowsingHistoryBridge();
+    }
+
+    /**
+     * Called when the activity/native page is destroyed.
+     */
+    public void onDestroyed() {
+        mBridge.destroy();
+        mDestroyed = true;
+    }
+
+    /**
+     * Initializes the HistoryAdapter and loads the first set of browsing history items.
+     */
+    public void initialize() {
+        mBridge.queryHistory(new Callback<List<HistoryItem>>() {
+            @Override
+            public void onResult(List<HistoryItem> result) {
+                // Return early if the results are returned after the activity/native page is
+                // destroyed to avoid unnecessary work.
+                if (mDestroyed) return;
+
+                loadItems(result);
+            }
+        }, EMPTY_QUERY, 0);
+    }
+
+    @Override
+    protected ViewHolder createViewHolder(ViewGroup parent) {
+        View v = LayoutInflater.from(parent.getContext()).inflate(
+                R.layout.history_item_view, parent, false);
+        return new SelectableItemViewHolder<HistoryItem>(v, mSelectionDelegate);
+    }
+
+    @Override
+    protected void bindViewHolderForTimedItem(ViewHolder current, TimedItem timedItem) {
+        final HistoryItem item = (HistoryItem) timedItem;
+        @SuppressWarnings("unchecked")
+        SelectableItemViewHolder<HistoryItem> holder =
+                (SelectableItemViewHolder<HistoryItem>) current;
+        holder.displayItem(item);
+    }
+
+    @Override
+    protected int getTimedItemViewResId() {
+        return R.layout.date_view;
+    }
+
+}