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<uses-feature android:name="android.hardware.touchscreen" android:required="false"/>
This section is currently in development.
In the Tegra Android Development Pack, there is a sample (
native_gamepad) showing controller support in native code.
The native game controller sample shows how to discover (at the Java level) the available game controllers, buttons and axes, and how to handle gamepad buttons and axes in native code. The NVIDIA support library,
nv_input is used to query a non-NDK Android function to add native support for analog joystick axes.
Honeycomb 3.1 (API 12) is where game controllers really became available to Android developers. The goal of this document is to show how to easy it is to add game controller support which requires the use of API 12 or better.
We realize that some older applications are not developed with Honeycomb 3.1+ in mind. Since we want to have the ability to use the latest that 3.1 has to offer but still be able to run on a breadth of older Android devices, we need some forethought before designing our control system. At a high level, this means having touch controls for pre-3.1 devices and game controller controls for 3.1+ devices.
One simple way is to create two separate applications: one for pre-3.1 and one for 3.1 and above. A common split uses higher definition graphics on the 3.1+ version since most devices running 3.1+ are more powerful and the "normal" graphics on the pre-3.1 version.
Another way is to use the "Multiple APK" support in Android. In short, this allows you to use multiple APKs for different APK levels, in turn allowing your application to be under one entry in Google Play. An excellent guide is here:
The above methods may not be desirable, especially when retro-fitting older applications with controller support.
The presumption, going forward, is we’d like touch controls on pre-3.1 devices but still be able to use all that 3.1+ provides like controller support in a single APK. Honeycomb 3.1+ allows for both USB Controllers and Bluetooth HID Controllers. Fortunately, the code path for both is the same. Android takes care of how a controller is connected for you.
In order for this approach to work with devices from API 12+ to API 1, a game would need to compile under API 12+ even though its manifest claims an earlier API. This is perfectly valid as long as care is taken in calling only APIs that are available, given the OS. Part of the page below discusses checking the Android Build Version at runtime:
For instance, a game running on pre-3.1 would not want to react to anything but touch type events. A check during initialization for what API level the OS is would be helpful. Then appropriate action could be taken when the game’s input system is run.
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