Whenever you use (this) on click events, your main activity has to implement ocClickListener. Android Studio does it for you, press alt+enter on ... ... <看更多>

Android Button OnClick Tutorial. GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

Choosing an icon · Expand app > res in the Project > Android pane, and right-click (or Command-click) the drawable folder. · Choose New > Image Asset. · Choose ... ... <看更多>

Why do you want an interface? Is it to enforce at compile time that the activity class has the methods that are defined in the onClick attributes in the XML ... ... <看更多>