java.lang.NumberFormatException

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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 josephshin.tempconv.MainActivity$2.afterTextChanged(MainActivity.java:56) at android.widget.TextView.sendAfterTextChanged(TextView.java:9271) at android.widget.TextView$ChangeWatcher.afterTextChanged(TextView.java:12015) at android.text.SpannableStringBuilder.sendAfterTextChanged(SpannableStringBuilder.java:1047) at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:564) at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:225) at android.text.SpannableStringBuilder.delete(SpannableStringBuilder.java:34) at android.text.method.BaseKeyListener.backspaceOrForwardDelete(BaseKeyListener.java:106) at android.text.method.BaseKeyListener.backspace(BaseKeyListener.java:51) at android.text.method.BaseKeyListener.onKeyDown(BaseKeyListener.java:215) at android.text.method.NumberKeyListener.onKeyDown(NumberKeyListener.java:138) at android.widget.TextView.doKeyDown(TextView.java:7187) at android.widget.TextView.onKeyDown(TextView.java:6994) at android.view.KeyEvent.dispatch(KeyEvent.java:3249) at android.view.View.dispatchKeyEvent(View.java:9838) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1739) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1739) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1739) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1739) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1739) at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1739) at com.android.internal.policy.PhoneWindow$DecorView.superDispatchKeyEvent(PhoneWindow.java:2808) at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1838) at android.app.Activity.dispatchKeyEvent(Activity.java:2977) at android.support.v7.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:543) at android.support.v7.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:53) at android.support.v7.app.AppCompatDelegateImplBase$AppCompatWindowCallbackBase.dispatchKeyEvent(AppCompatDelegateImplBase.java:312) at com.android.internal.policy.PhoneWindow$DecorView.dispatchKeyEvent(PhoneWindow.java:2682) at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5273) at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5226) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4673) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4726) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4692) at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:4834) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4700) at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:4891) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4673) at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:4726) at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:4692) at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:4700) at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:4673) at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:7359) at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:7237) at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:7198) at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:4310) at android.os.Handler.dispatchMessage(Handler.java:102) at android.os.Looper.loop(Looper.java:158) at android.app.ActivityThread.main(ActivityThread.java:7225) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)

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