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我收到此错误:

 Error(3, 19) package android.app does not exist

    Error(4, 18) package android.os does not exist

    Error(6, 33) cannot find symbol
    symbol: class Activity

    Error(11, 26)cannot find symbol
    symbol: class Bundle

    Error(12, 9)cannot find symbol
    symbol  : variable super

    Error(13, 9)cannot find symbol
    symbol  : method setContentView(int)

    Error(10, 5)method does not override or implement a method from a supertype.

我知道我必须安装哪个库,但我对此感到困惑。

我该怎么做?我正在使用 osx

非常感谢。

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