Interface FrameListener

public interface FrameListener

Receives camera frames from an active CameraSession.

Threading: #onFrame(CameraFrame) is invoked on a non-EDT background thread. Do not touch UI directly. The standard pattern is to hand the JPEG bytes to one of the com.codename1.ai.* modules (whose AsyncResource.ready(...) callbacks already hop back to EDT), or to call com.codename1.ui.Display#callSerially(Runnable) yourself before updating the UI.

Backpressure: only one frame is delivered at a time per session. If a previous onFrame call is still running when a new frame arrives, the older frame is dropped silently. This is the right default for AI scanning use cases.

Memory: the byte arrays returned by CameraFrame#getJpegBytes() and CameraFrame#getRawBytes() are owned by the framework and become invalid once onFrame returns. Listeners that need to retain bytes past the callback must clone them.

  • Method Summary

    Modifier and Type
    Method
    Description
    void
    onFrame(CameraFrame frame)
     

  • Method Details