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Invalid double: ""
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java.lang.NumberFormatException: Invalid double: ""	at java.lang.StringToReal.invalidReal(	at java.lang.StringToReal.parseDouble(	at java.lang.Double.parseDouble(	at com.example.cmleu_000.myapplication.MainActivity.onClick(	at android.view.View.performClick(	at android.view.View$	at android.os.Handler.handleCallback(	at android.os.Handler.dispatchMessage(	at android.os.Looper.loop(	at	at java.lang.reflect.Method.invoke(Native Method)	at$	at