^
.../MainActivity.java:28: cannot find symbol symbol : variable activity_main location: class android.R.layout setContentView(R.layout.activity_main); ^java
答案: Eclipse生成的中間結果不要拷貝過來,你的app 文件夾只保存res, src目錄就好。像其餘的文件夾(如assets,bin, gen)要刪掉,而後再在整包android source code來build.android
答案每每很簡單,過程很磨人!app