Android implements the effect of displaying and hiding progress bar on the title

An interface to display a horizontal progress bar on the title when adding pictures to the page. When the pictures are loaded, hide the progress bar and display the pictures

Specific implementation method: RES / layout / main.xml:

MainActivity:

The operation effect is as follows:

The following figure shows the loading process. A progress bar above the title bar shows the progress of loading pictures

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The following figure shows the picture after loading

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