Android Native Development Kit Cookbook by Unknown

Author:Unknown
Language: eng
Format: epub
Publisher: Packt Publishing

Attach an event queue: This is done by ALooper_addFd. The function has the following prototype:int ALooper_addFd(ALooper* looper, int fd, int ident, int events, ALooper_callbackFunc callback, void* data);

The function can be used in two ways. Firstly, if callback is set to NULL, the ident set will be returned by ALooper_pollOnce and ALooper_pollAll. Secondly, if callback is non-NULL, then the callback function will be executed and ident is ignored. The android_native_app_glue library uses the first approach to attach a new event queue to the looper. The input argument fd indicates the file descriptor associated with the event queue. ident is the identifier for the events from the event queue, which can be used to classify the event. The identifier must be bigger than zero when callback is set to NULL. callback is set to NULL in the library source code, and data points to the private data that will be returned along with the identifier at polling.

In the library, this function is called to attach the activity lifecycle event queue to the background thread. The input event queue is attached using the input queue specific function AInputQueue_attachLooper, which we will discuss in the Detecting and handling input events at NDK recipe.

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