Ошибка приложений, показывающая NumberFormatException: невозможно разобрать «как целое в Android?

Question

В моем приложении я возвращаю текст, который соответствует заданной группе регулярного выражения, используя метод match.group (int group), где «match» - это объект Matcher. Но после запуска приложения я получаю исключение NumberFormatException. Я попытался использовать методы match.find() и match.matches() перед использованием метода match.group(), но затем я получаю исключение IllegalStateException, и приложение снова сбой.

Это мой код:

public int getProgramNumberInt() { 
    Matcher m = PROGRAM_NUMBER_INT_PATTERN.matcher(programNumber); 
    return m.matches() ? Integer.parseInt(m.group(1)) : 0; 
} 

Катастрофа происходит на этой линии:

return m.matches() ? Integer.parseInt(m.group(1)) : 0; 

Logcat:

04-23 15:45:25.096: E/AndroidRuntime(16260): FATAL EXCEPTION: main 
04-23 15:45:25.096: E/AndroidRuntime(16260): java.lang.NumberFormatException: unable to parse '' as integer 
04-23 15:45:25.096: E/AndroidRuntime(16260): at java.lang.Integer.parseInt(Integer.java:412) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at java.lang.Integer.parseInt(Integer.java:382) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at com.example.Matcher.getProgramNumberInt(Starter.java:101) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at com.example.Matcher.results.ResultsActivity$Adapter.getPayoffView(ResultsActivity.java:127) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at com.example.Matcher.results.ResultsActivity$Adapter.getView(ResultsActivity.java:62) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.AbsListView.obtainView(AbsListView.java:1294) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.ListView.measureHeightOfChildren(ListView.java:1198) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.ListView.onMeasure(ListView.java:1109) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.LinearLayout.measureVertical(LinearLayout.java:381) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1012) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.LinearLayout.measureVertical(LinearLayout.java:381) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:3132) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.View.measure(View.java:8171) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewRoot.performTraversals(ViewRoot.java:801) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.os.Handler.dispatchMessage(Handler.java:99) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.os.Looper.loop(Looper.java:123) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at android.app.ActivityThread.main(ActivityThread.java:4627) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at java.lang.reflect.Method.invokeNative(Native Method) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at java.lang.reflect.Method.invoke(Method.java:521) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) 
04-23 15:45:25.096: E/AndroidRuntime(16260): at dalvik.system.NativeStart.main(Native Method) 

Не могли бы вы, пожалуйста, дайте мне знать, если есть способ предотвратить приложение от сбоев и решить эту проблему? Спасибо.

Answer 1

Метод m.group(1) возвращает '' пустую строку. Таким образом, метод parseInt() составляет NumberFormatException.