No App Icon on ActionBar

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As of AppCompat version 21, the Action Bar follows the material design guidelines and uses a Toolbar:

  • A title and subtitle. The title should be a signpost for the Toolbar’s current position in the navigation hierarchy and the content contained there. The subtitle, if present should indicate any extended information about the current content. If an app uses a logo image it should strongly consider omitting a title and subtitle.

In modern Android UIs developers should lean more on a visually distinct color scheme for toolbars than on their application icon. The use of application icon plus title as a standard layout is discouraged on API 21 devices and newer.

However, if you want an application icon, setLogo() is the correct method.

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