As shown in the figure below:

Choose the Activity of the Android studio template, is a return arrow in the upper left corner, but why after entering no arrow instead?

Which master can raise a point?

CodePudding user response:

Have no ah, as just to show that you can use a linelayout himself a structure,

CodePudding user response:

Here you can add back button method
https://blog.csdn.net/codingofdevolopment/article/details/83584429

CodePudding user response:

Encapsulated in the Activity base class, oneself write a ToolBar, inside put a picture back

CodePudding user response:

Without the involved in AndroidManifest. XML, child Activity with the parent Activity statement can,
Such as setting, this sentence is MemberDetailActivity MainActivity child window, start at the top of the column is automatically after MemberDetailActivity there will be a back button,