有一个重复的问题，但我们对如何实施它有不同的看法。一旦应用程序运行，我将自动显示，除了表格之外，日期的textview上面是我在片段中实现的Material Calendar Design。所以我的问题就是自己的标题。
继承我在 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;
}
}
我知道已经存在用于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“App停止工作”），那么你们有其他解决方案吗？
这是 logcat
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
答案 0 :(得分：3)
你导入了错误的库。 走到你的片段顶部，改变
import android.icu.text.SimpleDateFormat;
到
import java.text.SimpleDateFormat;
答案 1 :(得分：1)
此代码不会产生任何崩溃并且对我来说非常完美。
long date = System.currentTimeMillis(); SimpleDateFormat sdf = new SimpleDateFormat("MMM MM dd, yyyy h:mm a"); String dateString = sdf.format(date); textView.setText(dateString);