Android project implements the system notification bar message with progress bar

When developing Android, we often encounter background threads executing, for example, when downloading files. At this time, we want customers to see that there are operations in the background. At this time, we can use the progress bar. Since it runs in the background, it is to try not to occupy the current operation space, and users may have to perform other operations, The best way is to have a notification message in the notification bar and a progress bar. This paper gives an example for readers' reference The renderings are as follows:

If there is only one button on the main interface, the file will not be displayed

The notification bar displays the used layout file content_ view. xml

Main operation class:

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