Android开发【07-28疑问贴】新手关于Android版本的一点疑问

点击按钮后会回到上一界面。。。
beginTime.setOnClickListener(new Button.OnClickListener(){
public void onClick(View v) {
final Calendar calendar = Calendar.getInstance();
final int hour = calendar.get(Calendar.HOUR_OF_DAY);
final int minute = calendar.get(Calendar.MINUTE);
TimePickerDialog.OnTimeSetListener setting = new TimePickerDialog.OnTimeSetListener()
{
@Override
public void onTimeSet(TimePicker view, int hour, int minute)
{
Toast.makeText(CreateNewTaskActivity.this,Integer.toString(hour)+" :" +Integer.toString(minute),Toast.LENGTH_LONG).show();
}
};
final TimePickerDialog timePickerDialog = new TimePickerDialog(CreateNewTaskActivity.this, setting, hour, minute, true);
timePickerDialog.show();
}

已解决：导入 Java.util.Calendar代替Android.icu.util.calendar