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  • How can i fix a numberformatexception
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  • Check if editText is empty or not
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    • java.lang.IllegalStateException: Could not execute method for android:onClick at$DeclaredOnClickListener.onClick( at android.view.View.performClick( at android.widget.TextView.performClick( at android.view.View$ 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 Caused by: java.lang.reflect.InvocationTargetException at java.lang.reflect.Method.invoke(Native Method) at$DeclaredOnClickListener.onClick( ... 10 more Caused by: java.lang.NumberFormatException: Invalid double: "" at java.lang.StringToReal.invalidReal( at java.lang.StringToReal.parseDouble( at java.lang.Double.parseDouble( at com.example.shelbywallace.mycalc.MainActivity.OnCalculate( ... 12 more

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