  Due to the importance of Android app quality assurance, many automated GUI
testing tools have been developed. Although the test algorithms have been
improved, the impact of GUI rendering has been overlooked. On the one hand,
setting a long waiting time to execute events on fully rendered GUIs slows down
the testing process. On the other hand, setting a short waiting time will cause
the events to execute on partially rendered GUIs, which negatively affects the
testing effectiveness. An optimal waiting time should strike a balance between
effectiveness and efficiency. We propose AdaT, a lightweight image-based
approach to dynamically adjust the inter-event time based on GUI rendering
state. Given the real-time streaming on the GUI, AdaT presents a deep learning
model to infer the rendering state, and synchronizes with the testing tool to
schedule the next event when the GUI is fully rendered. The evaluations
demonstrate the accuracy, efficiency, and effectiveness of our approach. We
also integrate our approach with the existing automated testing tool to
demonstrate the usefulness of AdaT in covering more activities and executing
more events on fully rendered GUIs.
