java - What is the bottom button called in the navigation bar, that you sometime see for changing settings -

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image

how yellow circled button called , how can make show?

it's legacy overflow button. it's required old apps can run on newer devices without hardware menu button.

  • if set either minsdkversion or targetsdkversion 11 or higher, system not add legacy overflow button.

  • otherwise, system add legacy overflow button when running on android 3.0 or higher.

  • the exception if set minsdkversion 10 or lower, set targetsdkversion 11, 12, or 13, , not use actionbar, system add legacy overflow button when running app on handset android 4.0 or higher.

http://android-developers.blogspot.com/2012/01/say-goodbye-to-menu-button.html

consider designing apps don't need legacy overflow.


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