Detailed examples of Android application accessing public data

Detailed examples of Android application accessing public data

When running each application, the Android system will create an application object to store public variables related to the whole application. An Android application will only generate one application object. The application objects obtained in different activities are the same, so the application object is a singleton.

The application object is very suitable for storing some data related to the whole application, such as application version, application login account, data cache, etc. Using application objects to store public data or data transfer

In Android development, activity switching is very frequent, which is almost the same as switching between different pages in a website. Then different activities need to store public information (such as only one currently logged in user) and data transmission. The following is a method of using the application object to store login user information. It can be found that it is very convenient for different activities to obtain login user information

It can be found that through the application object, data sharing can be easily realized between different activities. This is much more convenient than passing data through the bundle each time the activity is switched.

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