Java 如何在片段内的文本视图中设置当前日期和时间？

有一个重复的问题，但我们对如何实施它有不同的看法。我的日历将在应用程序运行后自动显示，除此之外，日期的文本视图上方是一个重要的日历设计，我已经在一个片段中实现了它。所以我的问题是它自己的名字

以下是我在ScheduleFragment.java中的代码：

package com.example.guitarista.citem;


import android.icu.text.SimpleDateFormat;
import android.icu.util.Calendar;
import android.icu.util.TimeZone;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;

import com.prolificinteractive.materialcalendarview.CalendarDay;
import com.prolificinteractive.materialcalendarview.CalendarMode;
import com.prolificinteractive.materialcalendarview.MaterialCalendarView;
import com.prolificinteractive.materialcalendarview.OnDateSelectedListener;

import java.util.Date;


/**
 * A simple {@link Fragment} subclass.
 */
public class ScheduleFragment extends Fragment {


    public ScheduleFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        getActivity().setTitle("My Schedule");
        View v = inflater.inflate(R.layout.fragment_schedule, container, false);

        SimpleDateFormat sdf = new SimpleDateFormat("yyyyMMdd_HHmmss");
        String currentDateandTime = sdf.format(new Date());
        TextView tv = (TextView) v.findViewById(R.id.textDate2);
        tv.setText(currentDateandTime);

        final MaterialCalendarView materialCalendarView = (MaterialCalendarView) v.findViewById(R.id.calendarView);
        materialCalendarView.state().edit()
                .setFirstDayOfWeek(Calendar.MONDAY)
                .setMinimumDate(CalendarDay.from(1900, 1, 1))
                .setMaximumDate(CalendarDay.from(2100, 12, 31))
                .setCalendarDisplayMode(CalendarMode.MONTHS)
                .commit();

        materialCalendarView.setOnDateChangedListener(new OnDateSelectedListener() {
            @Override
            public void onDateSelected(@NonNull MaterialCalendarView widget, @NonNull CalendarDay date, boolean selected) {
                //Toast.makeText(getActivity(), "", Toast.LENGTH_SHORT).show();
                if (materialCalendarView.getSelectedDate().equals(CalendarDay.from(2017, 0, 1))) {
                    Toast.makeText(getActivity(), "NEW YEAR!", Toast.LENGTH_SHORT).show();
                }
                else if (materialCalendarView.getSelectedDate().equals(CalendarDay.from(2017, 1, 14))) {
                    Toast.makeText(getActivity(), "Happy Valentines Day!", Toast.LENGTH_SHORT).show();
                }
            }
        });
        return v;
    }

}

我知道已经有了设置当前日期和时间的代码，但应用程序无法正常运行（例如“应用程序停止工作”），所以你们有其他解决方案吗

这是日志猫

01-18 10:39:05.061 26486-26486/? I/art: Late-enabling -Xcheck:jni
01-18 10:39:05.071 26486-26486/? V/appproc: App process: starting thread pool.
01-18 10:39:05.089 26486-26500/? E/art: Failed sending reply to debugger: Broken pipe
01-18 10:39:05.090 26486-26500/? I/art: Debugger is no longer active
01-18 10:39:05.094 26486-26486/? D/Proxy: setHttpRequestCheckHandler
01-18 10:39:05.109 26486-26486/? D/wangcy9: setStatusIcon occur wrong theme!
01-18 10:39:05.184 26486-26509/? D/OpenGLRenderer: Use EGL_SWAP_BEHAVIOR_PRESERVED: true
01-18 10:39:05.188 26486-26486/? D/ViewRootImpl: loadSystemProperties PersistDebugEvent: false RoDebugEvent: false
01-18 10:39:05.218 26486-26509/? I/Adreno-EGL: <qeglDrvAPI_eglInitialize:379>: EGL 1.4 QUALCOMM build: AU_LINUX_ANDROID_LA.BR.1.1.3_RB1.05.01.00.032.017_msm8916_64_LA.BR.1.1.3_RB1__release_AU ()
                                               OpenGL ES Shader Compiler Version: E031.25.03.04
                                               Build Date: 04/29/15 Wed
                                               Local Branch: mybranch9502464
                                               Remote Branch: quic/LA.BR.1.1.3_rb1.12
                                               Local Patches: NONE
                                               Reconstruct Branch: AU_LINUX_ANDROID_LA.BR.1.1.3_RB1.05.01.00.032.017 + 26a3cba + 6f69ea6 + 8bc2bc8 + 649fcde + a52cccf + dbf281f + 15f0bf8 +  NOTHING
01-18 10:39:05.219 26486-26509/? I/OpenGLRenderer: Initialized EGL, version 1.4
01-18 10:39:05.229 26486-26509/? D/OpenGLRenderer: Enabling debug mode 0
01-18 10:39:05.234 26486-26509/? I/qdutils: PartialUpdate status: Disabled
01-18 10:39:05.234 26486-26509/? I/qdutils: Left Align: 0
01-18 10:39:05.234 26486-26509/? I/qdutils: Width Align: 0
01-18 10:39:05.234 26486-26509/? I/qdutils: Top Align: 0
01-18 10:39:05.234 26486-26509/? I/qdutils: Height Align: 0
01-18 10:39:05.234 26486-26509/? I/qdutils: Min ROI Width: 0
01-18 10:39:05.234 26486-26509/? I/qdutils: Min ROI Height: 0
01-18 10:39:05.234 26486-26509/? I/qdutils: Needs ROI Merge: 0
01-18 10:39:05.234 26486-26509/? I/qdutils: Dynamic Fps: Disabled
01-18 10:39:05.234 26486-26509/? I/qdutils: Min Panel fps: 0
01-18 10:39:05.234 26486-26509/? I/qdutils: Max Panel fps: 0
01-18 10:39:05.321 26486-26486/? I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@12412c01 time:193527594
01-18 10:39:09.889 26486-26486/com.example.guitarista.citem I/Timeline: Timeline: Activity_launch_request id:com.example.guitarista.citem time:193532162
01-18 10:39:09.896 26486-26486/com.example.guitarista.citem I/Choreographer: Skipped 36 frames!  The application may be doing too much work on its main thread.
01-18 10:39:09.926 26486-26486/com.example.guitarista.citem W/art: Before Android 4.1, method android.graphics.PorterDuffColorFilter android.support.graphics.drawable.VectorDrawableCompat.updateTintFilter(android.graphics.PorterDuffColorFilter, android.content.res.ColorStateList, android.graphics.PorterDuff$Mode) would have incorrectly overridden the package-private method in android.graphics.drawable.Drawable
01-18 10:39:09.940 26486-26486/com.example.guitarista.citem D/wangcy9: setStatusIcon occur wrong theme!
01-18 10:39:10.228 26486-26505/com.example.guitarista.citem I/art: Background partial concurrent mark sweep GC freed 1161(54KB) AllocSpace objects, 0(0B) LOS objects, 40% free, 48MB/81MB, paused 5.124ms total 22.066ms
01-18 10:39:10.309 26486-26486/com.example.guitarista.citem D/ViewRootImpl: loadSystemProperties PersistDebugEvent: false RoDebugEvent: false
01-18 10:39:10.457 26486-26486/com.example.guitarista.citem I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@202b8645 time:193532731
01-18 10:39:14.121 26486-26486/com.example.guitarista.citem D/AndroidRuntime: Shutting down VM
01-18 10:39:14.122 26486-26486/com.example.guitarista.citem E/AndroidRuntime: FATAL EXCEPTION: main
                                                                              Process: com.example.guitarista.citem, PID: 26486
                                                                              java.lang.NoClassDefFoundError: Failed resolution of: Landroid/icu/text/SimpleDateFormat;
                                                                                  at com.example.guitarista.citem.ScheduleFragment.onCreateView(ScheduleFragment.java:46)
                                                                                  at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080)
                                                                                  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108)
                                                                                  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290)
                                                                                  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801)
                                                                                  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677)
                                                                                  at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:536)
                                                                                  at android.os.Handler.handleCallback(Handler.java:739)
                                                                                  at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                                  at android.os.Looper.loop(Looper.java:135)
                                                                                  at android.app.ActivityThread.main(ActivityThread.java:5322)
                                                                                  at java.lang.reflect.Method.invoke(Native Method)
                                                                                  at java.lang.reflect.Method.invoke(Method.java:372)
                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905)
                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700)
                                                                               Caused by: java.lang.ClassNotFoundException: Didn't find class "android.icu.text.SimpleDateFormat" on path: DexPathList[[zip file "/data/app/com.example.guitarista.citem-1/base.apk"],nativeLibraryDirectories=[/vendor/lib, /system/lib]]
                                                                                  at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
                                                                                  at java.lang.ClassLoader.loadClass(ClassLoader.java:511)
                                                                                  at java.lang.ClassLoader.loadClass(ClassLoader.java:469)
                                                                                  at com.example.guitarista.citem.ScheduleFragment.onCreateView(ScheduleFragment.java:46) 
                                                                                  at android.support.v4.app.Fragment.performCreateView(Fragment.java:2080) 
                                                                                  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1108) 
                                                                                  at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1290) 
                                                                                  at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:801) 
                                                                                  at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1677) 
                                                                                  at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:536) 
                                                                                  at android.os.Handler.handleCallback(Handler.java:739) 
                                                                                  at android.os.Handler.dispatchMessage(Handler.java:95) 
                                                                                  at android.os.Looper.loop(Looper.java:135) 
                                                                                  at android.app.ActivityThread.main(ActivityThread.java:5322) 
                                                                                  at java.lang.reflect.Method.invoke(Native Method) 
                                                                                  at java.lang.reflect.Method.invoke(Method.java:372) 
                                                                                  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:905) 
                                                                                  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:700) 
                                                                                Suppressed: java.lang.ClassNotFoundException: android.icu.text.SimpleDateFormat
                                                                                  at java.lang.Class.classForName(Native Method)
                                                                                  at java.lang.BootClassLoader.findClass(ClassLoader.java:781)
                                                                                  at java.lang.BootClassLoader.loadClass(ClassLoader.java:841)
                                                                                  at java.lang.ClassLoader.loadClass(ClassLoader.java:504)
                                                                                        ... 16 more
                                                                               Caused by: java.lang.NoClassDefFoundError: Class not found using the boot class loader; no stack available
01-18 10:39:17.882 26486-26486/com.example.guitarista.citem I/Process: Sending signal. PID: 26486 SIG: 9

01-18 10:39:05.061 26486-26486/？I/art:Late-enabling-Xcheck:jni
01-18 10:39:05.071 26486-26486/? V/appproc:App进程：正在启动线程池。
01-18 10:39:05.089 26486-26500/? E/art:向调试器发送答复失败：管道断裂
01-18 10:39:05.090 26486-26500/? I/art:调试器不再处于活动状态
01-18 10:39:05.094 26486-26486/? D/Proxy:setHttpRequestCheckHandler
01-18 10:39:05.109 26486-26486/? D/wangcy9:setStatusIcon出现错误主题！
01-18 10:39:05.184 26486-26509/? D/OpenGLRenderer:使用EGL\u交换\u行为\u保留：true
01-18 10:39:05.188 26486-26486/? D/ViewRootImpl:loadSystemProperties PersistDebugEvent:false RoDebugEvent:false
01-18 10:39:05.218 26486-26509/? I/Adreno EGL:：EGL 1.4高通公司构建：AU_LINUX_ANDROID_LA.BR.1.1.3_RB1.05.01.00.032.017_msm8916_64_LA.BR.1.1.3_RB1_发布版_AU（）
OpenGL ES着色器编译器版本：E031.25.03.04
建造日期：2015年4月29日星期三
本地分行：mybranch9502464
远程分支机构：quic/LA.BR.1.1.3_rb1.12
本地修补程序：无
重构分支：AU_LINUX_ANDROID_LA.BR.1.1.3_RB1.05.01.00.032.017+26a3cba+6f69ea6+8bc2bc8+649fcde+a52cccf+dbf281f+15f0bf8+NOTHING
01-18 10:39:05.219 26486-26509/? I/OpenGLRenderer:初始化EGL，版本1.4
01-18 10:39:05.229 26486-26509/? D/OpenGLRenderer:启用调试模式0
01-18 10:39:05.234 26486-26509/? I/Q实用程序：部分更新状态：已禁用
01-18 10:39:05.234 26486-26509/? I/qdutils:左对齐：0
01-18 10:39:05.234 26486-26509/? I/qdutils:宽度对齐：0
01-18 10:39:05.234 26486-26509/? I/qdutils:顶部对齐：0
01-18 10:39:05.234 26486-26509/? I/qdutils:高度对齐：0
01-18 10:39:05.234 26486-26509/? I/qdutils:最小ROI宽度：0
01-18 10:39:05.234 26486-26509/? I/qdutils:最小ROI高度：0
01-18 10:39:05.234 26486-26509/? I/qdutils:需要合并投资回报率：0
01-18 10:39:05.234 26486-26509/? I/qdutils:动态Fps:已禁用
01-18 10:39:05.234 26486-26509/? I/qdutils:最小面板fps:0
01-18 10:39:05.234 26486-26509/? I/qdutils:最大面板fps:0
01-18 10:39:05.321 26486-26486/? I/Timeline:Timeline:Activity\u idle id:android.os。BinderProxy@12412c01时间：193527594
01-18 10:39:09.889 26486-26486/com.example.guitarista.citem I/Timeline:Timeline:Activity\u launch\u request id:com.example.guitarista.citem时间：193532162
01-18 10:39:09.896 26486-26486/com.example.guitarista.citem I/编舞：跳过36帧！应用程序可能在其主线程上做了太多工作。
01-18 10:39:09.926 26486-26486/com.example.guitarista.citem W/art:Android 4.1之前的方法Android.graphics.PorterDuffColorFilter Android.support.graphics.dravable.VectorDrawableCompat.UpdatentFilter（Android.graphics.PorterDuffColorFilter，Android.content.res.ColorStateList，Android.graphics.PorterDuff$模式）将错误地重写android.graphics.drawable.drawable中的包私有方法
01-18 10:39:09.940 26486-26486/com.example.guitarista.citem D/wangcy9:setStatusIcon出现错误主题！
01-18 10:39:10.228 26486-26505/com.example.guitarista.citem I/art:背景部分并发标记扫描GC释放1161（54KB）AllocSpace对象，0（0B）LOS对象，40%空闲，48MB/81MB，暂停5.124ms总计22.066ms
01-18 10:39:10.309 26486-26486/com.example.guitarista.citem D/ViewRootImpl:loadSystemProperties PersistDebugEvent:false RoDebugEvent:false
01-18 10:39:10.457 26486-26486/com.example.guitarista.citem I/Timeline:Timeline:Activity\u idle id:android.os。BinderProxy@202b8645时间：193532731
01-18 10:39:14.121 26486-26486/com.example.guitarista.citem D/AndroidRuntime:关闭虚拟机
01-18 10:39:14.122 26486-26486/com.example.guitarista.citem E/AndroidRuntime:致命异常：main
进程：com.example.guitarista.citem，PID:26486
java.lang.NoClassDefFoundError:未能解析：Landroid/icu/text/SimpleDataFormat；
位于com.example.guitarista.citem.ScheduleFragment.onCreateView（ScheduleFragment.java:46）
位于android.support.v4.app.Fragment.performCreateView（Fragment.java:2080）
位于android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1108）
位于android.support.v4.app.FragmentManagerImpl.moveToState（FragmentManager.java:1290）
位于android.support.v4.app.BackStackRecord.run（BackStackRecord.java:801）
位于android.support.v4.app.FragmentManagerImpl.execPendingActions（FragmentManager.java:1677）
在android.support.v4.app.FragmentManagerImpl$1.run（Fragme
long date = System.currentTimeMillis(); SimpleDateFormat sdf = new SimpleDateFormat("MMM MM dd, yyyy h:mm a"); String dateString = sdf.format(date); textView.setText(dateString);

import android.icu.text.SimpleDateFormat;

import java.text.SimpleDateFormat;