Updated Android build instructions

BUILD.md

@@ -26,7 +26,15 @@ Note that you need [assimp](https://github.com/assimp/assimp) in order to compil
 
 ## <img src="./images/androidlogo.png" alt="" height="32px"> [Android](android/)
 
-Building on Android is done using [Android Studio](https://developer.android.com/studio/) (Google's own and free Android IDE) and requires a device that supports Vulkan. Please see the [Android readme](./android/README.md) for details on how to build and run the samples.
+Building on Android is done using the [Gradle Build Tool](https://gradle.org/). Put the ```bin``` directory of it somewhere in your path and from the root of the repository run:
+
+```
+cd android
+gradle assembleDebug
+```
+This will build all samples and output the apks to ```android\examples\bin```.
+
+If you want to build and install on a connected device or emulator image, run ```gradle installDebug``` instead.
 
 ## <img src="./images/applelogo.png" alt="" height="32px"> [iOS and macOS](xcode/)
 

android/README.md

@@ -1,37 +0,0 @@
-# <img src="./../images/androidlogo.png" alt="" height="32px"> Vulkan examples on Android
-
-## Device support
-- **To run these examples you need a device with an Android image that suports Vulkan**
-- Builds currently only support arm-v7, other architectures may be added later
-- Basic gamepad support is available too (zoom and rotate)
-- Basic touch control support (zoom, move, rotate, look)
-
-## Building
-
-### Requirements
-
-- [Android Studio](https://developer.android.com/studio/)
-- [Android NDK](https://developer.android.com/ndk/downloads/) (r11b or higher)
-- [Android SDK](https://developer.android.com/studio/index.html)
-
-### Update the asset pack
-
-During the Android build process, assets are copied over from the data folder, so it's important to make sure that a current version of the [asset pack](../data/README.md) has been downloaded and extracted. 
-
-### Building the Examples
-
-Select **Import project** from the welcome screen (or from inside Android via **File->New**):
-
-<img src="androidstudio01.jpg" alt="" width="384px">
-
-Navigate to the **android** subfolder of this repository (should be higlighted with a gadle symbol):
-
-<img src="androidstudio02.jpg" alt="" width="384px">
-
-Select OK to start the import.
-
-**Note:** Initial import will take a while due to the number of examples.
-
-Once the import is done, the samples can be build, debugged and run from inside Android Studio just like any other Android project.
-
-**Note:** If you update the repository at a later point you may have to resync to have additional examples added to the Android Studio project (**File->Sync Project with Gradle files**).