Add VerticalGridActivity to the leanback demo.

Change-Id: I38e8a85d5a7ae30b1c0ee71cff979456bdac0665

samples/SupportLeanbackDemos/src/com/example/android/leanback/VerticalGridActivity.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2014 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.example.android.leanback;
+
+import android.app.Activity;
+import android.os.Bundle;
+
+public class VerticalGridActivity extends Activity
+{
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.vertical_grid);
+        getWindow().setBackgroundDrawableResource(R.drawable.grid_bg);
+    }
+}

samples/SupportLeanbackDemos/src/com/example/android/leanback/VerticalGridFragment.java

@@ -0,0 +1,111 @@
+/*
+ * Copyright (C) 2014 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.example.android.leanback;
+
+import android.content.res.Resources;
+import android.graphics.Color;
+import android.os.Bundle;
+import android.support.v17.leanback.widget.ArrayObjectAdapter;
+import android.support.v17.leanback.widget.Presenter;
+import android.support.v17.leanback.widget.VerticalGridPresenter;
+import android.support.v17.leanback.widget.Row;
+import android.support.v17.leanback.widget.OnItemClickedListener;
+import android.support.v17.leanback.widget.OnItemSelectedListener;
+import android.util.Log;
+import android.view.Gravity;
+import android.view.View;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+import java.util.Random;
+
+public class VerticalGridFragment extends android.support.v17.leanback.app.VerticalGridFragment {
+    private static final String TAG = "leanback.VerticalGridFragment";
+
+    private static final int NUM_COLUMNS = 3;
+    private static final int NUM_ITEMS = 50;
+    private static final int HEIGHT = 200;
+
+    private ArrayObjectAdapter mAdapter;
+    private Random mRandom;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        Log.i(TAG, "onCreate");
+        super.onCreate(savedInstanceState);
+
+        mRandom = new Random();
+
+        Params p = new Params();
+        p.setBadgeImage(getActivity().getResources().getDrawable(R.drawable.ic_title));
+        p.setTitle("Leanback Vertical Grid Demo");
+        setParams(p);
+
+        setupFragment();
+    }
+
+    private void setupFragment() {
+        VerticalGridPresenter gridPresenter = new VerticalGridPresenter();
+        gridPresenter.setNumberOfColumns(NUM_COLUMNS);
+        setGridPresenter(gridPresenter);
+
+        mAdapter = new ArrayObjectAdapter(new GridItemPresenter());
+        for (int i = 0; i < NUM_ITEMS; i++) {
+            mAdapter.add(new MyItem(i));
+        }
+        setAdapter(mAdapter);
+
+        setOnItemSelectedListener(new OnItemSelectedListener() {
+            @Override
+            public void onItemSelected(Object item, Row row) {
+                Log.i(TAG, "item selected: " + ((MyItem) item).id);
+            }
+        });
+
+        setOnItemClickedListener(new OnItemClickedListener() {
+            @Override
+            public void onItemClicked(Object item, Row row) {
+                Log.i(TAG, "item clicked: " + ((MyItem) item).id);
+            }
+        });
+    }
+
+    private class GridItemPresenter extends Presenter {
+        public ViewHolder onCreateViewHolder(ViewGroup parent) {
+            TextView view = new TextView(parent.getContext());
+            // Choose a random height between HEIGHT and 1.5 * HEIGHT to
+            // demonstrate the staggered nature of the grid.
+            final int height = HEIGHT + mRandom.nextInt(HEIGHT / 2);
+            view.setLayoutParams(new ViewGroup.LayoutParams(200, height));
+            view.setFocusable(true);
+            view.setFocusableInTouchMode(true);
+            view.setBackgroundColor(Color.DKGRAY);
+            view.setGravity(Gravity.CENTER);
+            return new ViewHolder(view);
+        }
+
+        public void onBindViewHolder(ViewHolder viewHolder, Object item) {
+            ((TextView) viewHolder.view).setText(Integer.toString(((MyItem) item).id));
+        }
+
+        public void onUnbindViewHolder(ViewHolder viewHolder) {}
+    }
+
+    static class MyItem {
+        int id;
+        MyItem(int id) {
+            this.id = id;
+        }
+    }
+}