调用需要API级别24(当前最小值为12):android.icu.util.calendar

Question

我正在制作一个简单的报警应用.无论我在哪里使用Calendar类,它都会显示与标题相同的错误.

Calendar calendar = Calendar.getInstance();
calendar.setTimeInMillis(System.currentTimeMillis());
calendar.set(Calendar.HOUR_OF_DAY, 10);
calendar.set(Calendar.MINUTE, 30);

每当我构建我的项目时,它建立良好但应用程序崩溃时,它是在手机上启动.下面是Logcat:

07-22 18:24:15.607 18047-18047/com.example.panwa.afinal D/AndroidRuntime: Shutting down VM
07-22 18:24:15.607 18047-18047/com.example.panwa.afinal W/dalvikvm: threadid=1: thread exiting with uncaught exception (group=0x40d952d0)
07-22 18:24:15.627 18047-18047/com.example.panwa.afinal E/AndroidRuntime: ***FATAL EXCEPTION: main
  java.lang.NoClassDefFoundError: android.icu.util.Calendar***
      at com.example.panwa.afinal.MainActivity.startAt10(MainActivity.java:70)
      at com.example.panwa.afinal.MainActivity$3.onClick(MainActivity.java:46)
      at android.view.View.performClick(View.java:4275)
      at android.view.View$PerformClick.run(View.java:17434)
      at android.os.Handler.handleCallback(Handler.java:615)
      at android.os.Handler.dispatchMessage(Handler.java:92)
      at android.os.Looper.loop(Looper.java:177)
      at android.app.ActivityThread.main(ActivityThread.java:4947)
      at java.lang.reflect.Method.invokeNative(Native Method)
      at java.lang.reflect.Method.invoke(Method.java:511)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1038)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:805)
      at dalvik.system.NativeStart.main(Native Method)
07-22 18:25:33.824 18047-18047/com.example.panwa.afinal I/Process: Sending signal. PID: 18047 SIG: 9

我有一个我的min SDK设置为11但仍然无法正常工作.

Answer 1

而不是导入android.icu.util.calendar,尝试导入java.util.Calendar.

这android.icu.util.calendar是ICU的替代品,java.util.Calendar但它仅从API 24开始提供.因此,它仅适用于API 24及更高版本的设备.

参考:

• Java日历
• ICU日历