Added a UI for the Interests Prototype.

chrome/android/java/src/org/chromium/chrome/browser/ntp/interests/InterestsView.java

+// Copyright 2015 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.ntp.interests;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.LruCache;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.ArrayAdapter;
+import android.widget.FrameLayout;
+import android.widget.GridView;
+
+import org.chromium.chrome.R;
+import org.chromium.chrome.browser.ntp.interests.InterestsItemView.DrawingData;
+import org.chromium.chrome.browser.ntp.interests.InterestsItemView.ImageHolder;
+import org.chromium.chrome.browser.ntp.interests.InterestsPage.InterestsClickListener;
+import org.chromium.chrome.browser.ntp.interests.InterestsService.Interest;
+
+import java.util.List;
+
+/**
+ * Displays a user's Interests in a two column view. A user's Interests are a list of topics (eg.
+ * Movies, Artists, Sports Events) that Google Now Context data shows they are interested in.
+ */
+public class InterestsView extends FrameLayout {
+    private InterestsClickListener mListener;
+    private GridView mInterestsGrid;
+    private final InterestsListAdapter mAdapter;
+
+    public InterestsView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        mAdapter = new InterestsListAdapter(context);
+    }
+
+    /**
+     * This must be called before {@link InterestsView setInterests}.
+     * @param listener
+     */
+    public void setListener(InterestsClickListener listener) {
+        mListener = listener;
+    }
+
+    /**
+     * Sets the Interests to display. Must not be called before {@link InterestsView setListener}.
+     * @param interests
+     */
+    public void setInterests(List<Interest> interests) {
+        assert mListener != null;
+        mAdapter.addAll(interests);
+    }
+
+    @Override
+    protected void onFinishInflate() {
+        super.onFinishInflate();
+
+        mInterestsGrid = (GridView) findViewById(R.id.interests_list_view);
+        mInterestsGrid.setAdapter(mAdapter);
+    }
+
+    private class InterestsListAdapter extends ArrayAdapter<Interest> {
+        private final LruCache<String, ImageHolder> mImageCache;
+        private final DrawingData mDrawingData;
+
+        public InterestsListAdapter(Context context) {
+            super(context, 0);
+            mImageCache = new LruCache<>(30);
+            mDrawingData = new InterestsItemView.DrawingData(getContext());
+        }
+
+        @Override
+        public View getView(int position, View convertView, ViewGroup parent) {
+            assert mListener != null;
+
+            Interest interest = getItem(position);
+
+            InterestsItemView view;
+            if (convertView instanceof InterestsItemView) {
+                view = (InterestsItemView) convertView;
+                view.reset(interest);
+            } else {
+                view = new InterestsItemView(getContext(), interest,
+                        mListener, mImageCache, mDrawingData);
+            }
+            return view;
+        }
+    }
+}