Initial leanback sample code.

SupportLeanbackDemos starts out with a fully functional app with a
BrowseFragment. Still need to add examples with cursors, hovercards,
and more.

Change-Id: I845d5b92c29a5585af7968b08e7daa11b2996f5a

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

@@ -0,0 +1,56 @@
+/*
+ * 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.os.Bundle;
+import android.support.v17.leanback.widget.ArrayObjectAdapter;
+import android.support.v17.leanback.widget.HeaderItem;
+import android.support.v17.leanback.widget.ListRow;
+import android.support.v17.leanback.widget.ListRowPresenter;
+import android.util.Log;
+
+public class BrowseFragment extends android.support.v17.leanback.app.BrowseFragment {
+    private static final String TAG = "leanback.BrowseFragment";
+
+    private static final int NUM_ROWS = 3;
+    private ArrayObjectAdapter mRowsAdapter;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        Log.i(TAG, "onCreate");
+        super.onCreate(savedInstanceState);
+
+        Params p = new Params();
+        p.setTitle("Leanback Sample App");
+        p.setHeadersState(HEADERS_ENABLED);
+        setBrowseParams(p);
+
+        setupRows();
+    }
+
+    private void setupRows() {
+        mRowsAdapter = new ArrayObjectAdapter(new ListRowPresenter());
+
+
+        for (int i = 0; i < NUM_ROWS; ++i) {
+            ArrayObjectAdapter listRowAdapter = new ArrayObjectAdapter(new StringPresenter());
+            listRowAdapter.add("Hello world");
+            listRowAdapter.add("This is a test");
+            HeaderItem header = new HeaderItem(i, "Row " + i, null);
+            mRowsAdapter.add(new ListRow(header, listRowAdapter));
+        }
+
+        setAdapter(mRowsAdapter);
+    }
+}

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

@@ -0,0 +1,28 @@
+/*
+ * 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 MainActivity extends Activity
+{
+    /** Called when the activity is first created. */
+    @Override
+    public void onCreate(Bundle savedInstanceState)
+    {
+        super.onCreate(savedInstanceState);
+        setContentView(R.layout.main);
+    }
+}

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

@@ -0,0 +1,42 @@
+/*
+ * 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.support.v17.leanback.widget.Presenter;
+import android.util.Log;
+import android.view.ViewGroup;
+import android.widget.TextView;
+
+public class StringPresenter extends Presenter {
+    private static final String TAG = "StringPresenter";
+
+    public ViewHolder onCreateViewHolder(ViewGroup parent) {
+        Log.d(TAG, "onCreateViewHolder");
+        TextView tv = new TextView(parent.getContext());
+        tv.setFocusable(true);
+        tv.setFocusableInTouchMode(true);
+        tv.setBackground(
+                parent.getContext().getResources().getDrawable(R.drawable.text_bg));
+        return new ViewHolder(tv);
+    }
+
+    public void onBindViewHolder(ViewHolder viewHolder, Object item) {
+        Log.d(TAG, "onBindViewHolder for " + item.toString());
+        ((TextView) viewHolder.view).setText(item.toString());
+    }
+
+    public void onUnbindViewHolder(ViewHolder viewHolder) {
+        Log.d(TAG, "onUnbindViewHolder"); 
+    }
+}