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Invalid double: ""
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java.lang.NumberFormatException: Invalid double: ""	at java.lang.StringToReal.invalidReal(StringToReal.java:63)	at java.lang.StringToReal.parseDouble(StringToReal.java:267)	at java.lang.Double.parseDouble(Double.java:301)	at dipp.verlinden.Bereken$1.afterTextChanged(Bereken.java:64)	at android.widget.TextView.sendAfterTextChanged(TextView.java:9195)	at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:11939)	at android.text.SpannableStringBuilder.sendAfterTextChanged(SpannableStringBuilder.java:1047)	at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:564)	at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:494)	at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:34)	at android.view.inputmethod.BaseInputConnection.replaceText(BaseInputConnection.java:691)	at android.view.inputmethod.BaseInputConnection.commitText(BaseInputConnection.java:199)	at com.android.internal.widget.EditableInputConnection.commitText(EditableInputConnection.java:184)	at com.android.internal.view.IInputConnectionWrapper.executeMessage(IInputConnectionWrapper.java:286)	at com.android.internal.view.IInputConnectionWrapper$MyHandler.handleMessage(IInputConnectionWrapper.java:78)	at android.os.Handler.dispatchMessage(Handler.java:102)	at android.os.Looper.loop(Looper.java:158)	at android.app.ActivityThread.main(ActivityThread.java:7229)	at java.lang.reflect.Method.invoke(Native Method)	at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)