#Windowmanager touch evnt how to

2 Reading touch eventsĪll Android input devices will generate corresponding device nodes in the/dev/input directory.

The following will combine the latest Android 11 system source code, analyze and answer these questions to understand the full picture of the Android system touch event handling mechanism.

#Windowmanager touch evnt how to

How to deal with events in the target application window?.How to pass the event to the target window after finding the target application window?.How to find the target application window that receives the event when dispatching the event?.How to dispatch the event after reading the touch event?.How to read touch events from the device?.After that, the Android system needs to solve the following problems to realize the distribution and processing of the entire touch event: After the user's finger clicks and presses the screen, the screen touch driver generates an interrupt, and the Linux kernel will package the touch event generated by the hardware into an Event and place it in the dev/input/directory of the device.