Initial commit with Basic, CP and Advanced samples

Change-Id: I684c5705119375ad201a6ae4c72b68f4c185e32c

.gitignore

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+*.iml
+.idea
+.gradle
+/local.properties
+.DS_Store
+build/
+/captures
+.externalNativeBuild

BasicSample/.gitignore

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+*.iml
+.idea
+.gradle
+/local.properties
+.DS_Store
+build/
+/captures
+.externalNativeBuild

BasicSample/CONTRIBUTING.md

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+# How to become a contributor and submit your own code
+
+## Contributor License Agreements
+
+We'd love to accept your sample apps and patches! Before we can take them, we
+have to jump a couple of legal hurdles.
+
+Please fill out either the individual or corporate Contributor License Agreement (CLA).
+
+  * If you are an individual writing original source code and you're sure you
+    own the intellectual property, then you'll need to sign an [individual CLA]
+    (https://cla.developers.google.com).
+  * If you work for a company that wants to allow you to contribute your work,
+    then you'll need to sign a [corporate CLA]
+    (https://cla.developers.google.com).
+  * Please make sure you sign both, Android and Google CLA
+
+Follow either of the two links above to access the appropriate CLA and
+instructions for how to sign and return it. Once we receive it, we'll be able to
+accept your pull requests.
+
+## Contributing A Patch
+
+1. Submit an issue describing your proposed change to the repo in question.
+1. The repo owner will respond to your issue promptly.
+1. If your proposed change is accepted, and you haven't already done so, sign a
+   Contributor License Agreement (see details above).
+1. Fork the desired repo, develop and test your code changes.
+1. Ensure that your code adheres to the existing style in the sample to which
+   you are contributing. Refer to the
+   [Android Code Style Guide]
+   (https://source.android.com/source/code-style.html) for the
+   recommended coding standards for this organization.
+1. Ensure that your code has an appropriate set of unit tests which all pass.
+1. Submit a pull request.

BasicSample/LICENSE

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BasicSample/README.md

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+Android Architecture Components Basic Sample
+===================================
+
+This sample showcases the following Architecture Components:
+
+* [Room](https://developer.android.com/topic/libraries/architecture/room.html)
+* [ViewModels](https://developer.android.com/reference/android/arch/lifecycle/ViewModel.html)
+* [LiveData](https://developer.android.com/reference/android/arch/lifecycle/LiveData.html)
+
+## Features
+
+This sample contains two screens: a list of products and a detail view, that shows product reviews.
+
+### Presentation layer
+
+The presentation layer consists of the following components:
+ * A main activity that handles navigation.
+* A fragment to display the list of products.
+* A fragment to display a product review.
+
+The app uses a Model-View-ViewModel (MVVM) architecture for the presentation layer. Each of the fragments corresponds to a MVVM View. The View and ViewModel communicate  using LiveData and the following design principles:
+
+* ViewModel objects don't have references to activities, fragments, or Android views. That would cause leaks on configuration changes, such as a screen rotation, because the system retains a ViewModel across the entire lifecycle of the corresponding view.
+
+
+
+![ViewModel Diagram](docs/images/VM_diagram.png?raw=true "ViewModel Diagram")
+
+
+* ViewModel objects expose data using `LiveData` objects. `LiveData` allows you to observe changes to data across multiple components of your app without creating explicit and rigid dependency paths between them.
+
+* Views, including the fragments used in this sample, subscribe to corresponding `LiveData` objects. Because `LiveData` is lifecycle-aware, it doesn’t push changes to the underlying data if the observer is not in an active state, and this helps to avoid many common bugs. This is an example of a subscription:
+
+```java
+        // Update the list of products when the underlying data changes.
+        viewModel.getProducts().observe(this, new Observer<List<ProductEntity>>() {
+            @Override
+            public void onChanged(@Nullable List<ProductEntity> myProducts) {
+                if (myProducts != null) {
+                    mBinding.setIsLoading(false);
+                    mProductAdapter.setProductList(myProducts);
+                } else {
+                    mBinding.setIsLoading(true);
+                }
+            }
+        });
+```
+
+### Data layer
+
+The database is created using Room and it has two entities: a `ProductEntity` and a `CommentEntity` that generate corresponding SQLite tables at runtime.
+
+Room populates the database asynchronously on first use. The `DatabaseCreator` class is responsible for creating the database and tables, and populating them with sample product and review data. This is done on the first use of the database, with the help of an `AsyncTask`. To simulate low-performance, an artificial delay is added. To let other components know when the data has finished populating, the `DatabaseCreator` exposes a `LiveData` object..
+
+To access the data and execute queries, you use a [Data Access Object](https://developer.android.com/topic/libraries/architecture/room.html#daos) (DAO). For example, a product is loaded with the following query:
+
+```
+    @Query("select * from products where id = :productId")
+    LiveData<ProductEntity> loadProduct(int productId);
+```
+
+Queries that return a `LiveData` object can be observed, so when  a change in one of the affected tables is detected, `LiveData` delivers a notification of that change to the registered observers.
+
+### Transformations
+
+Fragments don't observe the database directly, they only interact with ViewModel objects. A ViewModel observes database queries as well as the `DatabaseCreator`, which exposes whether the database is created or not.
+
+For the purpose of the sample, the database is deleted and re-populated each time the app is started, so the app needs to wait until this process is finished. This is solved with a **Transformation**:
+
+```java
+        mObservableProducts = Transformations.switchMap(databaseCreated,
+                new Function<Boolean, LiveData<List<ProductEntity>>>() {
+            @Override
+            public LiveData<List<ProductEntity>> apply(Boolean isDbCreated) {
+                if (!isDbCreated) {
+                    return ABSENT;
+                } else {
+                    return databaseCreator.getDatabase().productDao().loadAllProducts();
+                }
+            }
+        });
+```
+
+Whenever `databaseCreated` changes, `mObservableProducts` will get a new value, either an `ABSENT` `LiveData` or the list of products. The database will be observed with the same scope as `mObservableProducts`.
+
+Note that the first time a LiveData object is observed, the current value is emitted and `onChanged` is called.
+
+The following diagram shows the general structure of the sample:
+
+
+![ViewModel Subscriptions diagram](docs/images/VM_subscriptions.png?raw=true "ViewModel Subscriptions diagram")
+
+Exercise for the reader: try to apply a transformation to the list of products in the ViewModel
+before they are delivered to the fragment. (hint: `Transformations.Map`).
+
+## License
+-------
+
+Copyright 2015 The Android Open Source Project, Inc.
+
+Licensed to the Apache Software Foundation (ASF) under one or more contributor
+license agreements.  See the NOTICE file distributed with this work for
+additional information regarding copyright ownership.  The ASF licenses this
+file to you 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.
+
+
+