err:Process: parking.fujichina.net.ch03

me: FATAL EXCEPTION: main Process: parking.fujichina.net.ch03_linearlayout, PID: 596 java.lang.IllegalStateException: Could not find method showCont(View) in a parent or ancestor Context for android:onClick attribute defined on view class android.support.v7.widget.AppCompatButton with id 'btn_ok'

 

在创建方法（在 onclick 中定义的）是少了参数：  

public void showCont(){}

应该更为：

 public void showCont(View v){}

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