title: Call requires API level 24(current minimum is 12):android.icu.util.calendar
body: <p>I am making a simple alarm app. Wherever I am using <code>Calendar</code> class it's showing an error same as title.</p>
  
  <pre><code>Calendar calendar = Calendar.getInstance();
  calendar.setTimeInMillis(System.currentTimeMillis());
  calendar.set(Calendar.HOUR_OF_DAY, 10);
  calendar.set(Calendar.MINUTE, 30);
  </code></pre>
  
  <p>Whenever I build my project, it builds fine but app crashes when it's launched on phone.
  Below is the Logcat:</p>
  
  <pre><code>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
  </code></pre>
  
  <p>I have a set my min SDK to be 11 but still it's not working.</p>