This can affect how pointer indexes are specified and released and when touch events are fired. Note that touch can be implemented quite differently on different devices.
#Input screenx screeny android#
Starting with phones like the Motorola Droid, multi-touch became a standard feature on most Android phones.
First generation Android phones only supported single-touch. Touch input does not have the notion of buttons and is complicated by the fact that multiple fingers might be tracked depending on the hardware. In addition, there’s often a scroll wheel which can be used for zooming or scrolling in many applications. Most mice feature a left and a right mouse button as well as a middle mouse button. Mouse input comes with additional information, namely which button was pressed. Both input mechanisms report the location of interaction as 2D coordinates relative to the upper left corner of the screen, with the positive x-axis pointing to the right and the y-axis pointing downward. Mouse and touch input allow the user to point at things on the screen. libGDX uses this mechanism under the hood to provide you with character information. Thankfully, the operating system usually has a means to hook up an event listener that not only reports key-code events (key pressed/key released), but also characters. In general, deriving characters from the keyboard’s state (which keys are down) is non-trivial. the character ‘A’ is generated by the keys ‘a’ and ‘shift’ being pressed simultaneously. This information is often derived from the state of multiple keys, e.g. Key-codes alone do not give us information about which character the user actually entered. You can query which keys are currently being pressed via Polling. libGDX tries to hide this fact by providing its own key-code table, see the Keys (source) class. These key-codes differ from platform to platform. Each event carries with it a key-code that identifies the key that was pressed/released. Keyboards signal user input by generating events for pressing and releasing a key. The main input devices libGDX supports are the mouse on the desktop/browser, touch screens on Android and keyboards.
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