设置时间时的java.lang.NullPointerException

时间选择器出现，但当我尝试选择时间时。下面是一个例外

时间分段类

import java.util.Calendar;
import com.actionbarsherlock.app.SherlockDialogFragment;
import android.app.Dialog;
import android.app.TimePickerDialog;
import android.content.Context;
import android.os.Bundle;
import android.text.format.DateFormat;
import android.widget.TimePicker;

public class TimePickerFragment extends SherlockDialogFragment implements TimePickerDialog.OnTimeSetListener
{
    private TimePickedListener mListener;
    static int hour;
    static int minute;
    static Context mContext;

    public static TimePickerFragment newInstance(Context context, TimePickedListener listener, Calendar now)
    {
        TimePickerFragment dialog = new TimePickerFragment();
        mContext = context;
        hour = now.get(Calendar.HOUR_OF_DAY);
        minute = now.get(Calendar.MINUTE);

        return dialog;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState)
    {
        return new TimePickerDialog(mContext, this, hour, minute, DateFormat.is24HourFormat(getActivity()));
    }

    @Override
    public void onTimeSet(TimePicker view, int hourOfDay, int minute)
    {
        // when the time is selected, send it to the activity via its callback
        // interface method
        Calendar c = Calendar.getInstance();
        c.set(Calendar.HOUR_OF_DAY, hourOfDay);
        c.set(Calendar.MINUTE, minute);

        mListener.onTimePicked(c);
    }

    public static interface TimePickedListener
    {
        public void onTimePicked(Calendar time);
    }
}

在主片段内选择时间

public void selectTime(final TextView lblTime, final int position) {
    hideRight();
    timeFrag = TimePickerFragment.newInstance(getActivity(), new TimePickedListener() {@
        Override
        public void onTimePicked(Calendar time) {
            lblTime.setText(DateFormat.format("h:mm a", time));
        }
    }, now);
    timeFrag.show(getActivity().getSupportFragmentManager(), "timePicker");
}

07-0217:28:04.214:E/XXX（10341）：未捕获的异常是：07-02 17:28:04.214:E/XXX（10341）：java.lang.NullPointerException 07-02 17:28:04.214:E/XXX（10341）：在 TimePickerFragment.onTimeSet（TimePickerFragment.java:47） 07-0217:28:04.214:E/XXX（10341）：在 TimePickerDialog.tryNotifyTimeSet（TimePickerDialog.java:130） 07-0217:28:04.214:E/XXX（10341）：在 android.app.TimePickerDialog.onClick（TimePickerDialog.java:115）07-02 17:28:04.214:E/XXX（10341）：在 com.android.internal.app.AlertController$ButtonHandler.handleMessage（AlertController.java:166） 07-0217:28:04.214:E/XXX（10341）：在 android.os.Handler.dispatchMessage（Handler.java:99）07-02 17:28:04.214:E/XXX（10341）：在 android.os.Looper.loop（Looper.java:137）07-0217:28:04.214: E/XXX（10341）：在 android.app.ActivityThread.main（ActivityThread.java:4928）07-02 17:28:04.214:E/XXX（10341）：在 java.lang.reflect.Method.Invokenactive（本机方法）07-02 17:28:04.214:E/XXX（10341）：在 java.lang.reflect.Method.invoke（Method.java:511）07-0217:28:04.214: E/XXX（10341）：在 com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run（ZygoteInit.java:791） 07-0217:28:04.214:E/XXX（10341）：在 com.android.internal.os.ZygoteInit.main（ZygoteInit.java:558）07-02 17:28:04.214:E/XXX（10341）：在dalvik.system.NativeStart.main（本机） （方法）

---

您忘记初始化

private timepicked监听器mListener

使用以下方法更改您的
newInstance
方法：

public static TimePickerFragment newInstance(Context context, TimePickedListener listener, Calendar now)
    {
        TimePickerFragment dialog = new TimePickerFragment();
        mContext = context;
        mListener = listener;
        hour = now.get(Calendar.HOUR_OF_DAY);
        minute = now.get(Calendar.MINUTE);

        return dialog;
    }

您忘记初始化
private timepicked监听器mListener

使用以下方法更改您的
newInstance
方法：

public static TimePickerFragment newInstance(Context context, TimePickedListener listener, Calendar now)
    {
        TimePickerFragment dialog = new TimePickerFragment();
        mContext = context;
        mListener = listener;
        hour = now.get(Calendar.HOUR_OF_DAY);
        minute = now.get(Calendar.MINUTE);

        return dialog;
    }

您没有实例化
private TimePickedListener MLListener任何地方。它引用的是
null

public static TimePickerFragment newInstance(Context context, TimePickedListener listener, Calendar now)
{
    TimePickerFragment dialog = new TimePickerFragment();
    mContext = context;
    hour = now.get(Calendar.HOUR_OF_DAY);
    minute = now.get(Calendar.MINUTE);
    mListener = listener; // you missed this line
    return dialog;
}

您没有实例化
private TimePickedListener MLListener任何地方。它引用的是
null

public static TimePickerFragment newInstance(Context context, TimePickedListener listener, Calendar now)
{
    TimePickerFragment dialog = new TimePickerFragment();
    mContext = context;
    hour = now.get(Calendar.HOUR_OF_DAY);
    minute = now.get(Calendar.MINUTE);
    mListener = listener; // you missed this line
    return dialog;
}

嗨，“时间”是怎么定义的？也请检查此处的链接：，java.lang.StringBuffer，java.text.FieldPosition）。format（）函数有三种不同的格式，我想您没有引用任何一种格式。您好，“时间”是如何定义的？也请检查此处的链接：，java.lang.StringBuffer，java.text.FieldPosition）。format（）函数有三种不同的格式，我想您没有引用其中任何一种。