DateTimeParseException：无法在索引 0

编程问答 2022-05-21

问题描述

我正在尝试从 Date 获取 DatePicker 和从 Time 获取 TimePicker 并将这两个类的值解析为带有 DateTimeFormatter 的单个 Java 时间戳，但是logcat 抛出这个 exception

 at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075)
     Caused by: java.lang.reflect.InvocationTargetException
        at java.lang.reflect.Method.invoke(Native Method)
        at androidx.appcompat.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:409)
        at android.view.View.performClick(View.java:7870) 
        at android.widget.TextView.performClick(TextView.java:14970) 
        at android.view.View.performClickInternal(View.java:7839) 
        at android.view.View.access$3600(View.java:886) 
        at android.view.View$PerformClick.run(View.java:29363) 
        at android.os.Handler.handleCallback(Handler.java:883) 
        at android.os.Handler.dispatchMessage(Handler.java:100) 
        at android.os.Looper.loop(Looper.java:237) 
        at android.app.ActivityThread.main(ActivityThread.java:7948) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1075) 
     Caused by: java.time.format.DateTimeParseException: Text '2 11,11 2021 21:35' could not be parsed at index 0
        at java.time.format.DateTimeFormatter.parseResolved0(DateTimeFormatter.java:1949)
        at java.time.format.DateTimeFormatter.parse(DateTimeFormatter.java:1777)
        at com.example.medicalnotifier.MainActivity.check(MainActivity.java:238)
        at com.example.medicalnotifier.MainActivity.onClick(MainActivity.java:341)

代码正在尝试用这个来格式化日期

         dpicker=datView.findViewById(R.id.user_date);
         year=dpicker.getYear();
         month=dpicker.getMonth();
         day=dpicker.getDayOfMonth();
         int hour=timepicker.getCurrentHour();
         int min=timepicker.getCurrentMinute();
         String pattern = "MMM dd,yyyy HH:mm";
         String timestamp= (String.valueOf(month)+" "+String.valueOf(day)+","+String.valueOf(day)
                 +" "+String.valueOf(year)+" "+String.valueOf(hour)+":"+String.valueOf(min));
         DateTimeFormatter formatter=DateTimeFormatter.ofPattern(pattern,Locale.ENGLISH);
         LocalDateTime localDateTime = LocalDateTime.from(formatter.parse(timestamp));
         mytimestamp=Timestamp.valueOf(localDateTime.toString());

解决方法

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datetimeformatterjavajavatimestamp