Operations such as the display and update of the UI interface are carried out on the main thread, so the main thread is also called the UI thread.
The callback mechanism provided by the Ability class can enable the Page instance to switch in the background following the user's operation.
When a developer develops an application based on HarmonyOS, the data used by a developer can be decomposed into multiple objects. The developer needs to add, delete, modify, and check the teaching data, but does not want to write overly complex SQL statements. In this scenario, the developer can use an object-relational mapping database to process the data.
The callback mechanism provided by the Ability class can enable the Page instance to switch in the background following the user's operation.
Operations such as the display and update of the UI interface are carried out on the main thread, so the main thread is also called the UI thread.
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