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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