[英]java.lang.NullPointerException while setting time
TimePicker shows up, but when i try to select time. TimePicker出现了,但是当我尝试选择时间时。 It throws me the exception below. 这使我感到异常。
TimeFragment Class. TimeFragment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);
}
}
Selecting time inside Main Fragment 在主片段中选择时间
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");
}
07-02 17:28:04.214: E/XXX(10341): Uncaught exception is: 07-02 17:28:04.214: E/XXX(10341): java.lang.NullPointerException 07-02 17:28:04.214: E/XXX(10341): at com.common.TimePickerFragment.onTimeSet(TimePickerFragment.java:47) 07-02 17:28:04.214: E/XXX(10341): at android.app.TimePickerDialog.tryNotifyTimeSet(TimePickerDialog.java:130) 07-02 17:28:04.214: E/XXX(10341): at android.app.TimePickerDialog.onClick(TimePickerDialog.java:115) 07-02 17:28:04.214: E/XXX(10341): at com.android.internal.app.AlertController$ButtonHandler.handleMessage(AlertController.java:166) 07-02 17:28:04.214: E/XXX(10341): at android.os.Handler.dispatchMessage(Handler.java:99) 07-02 17:28:04.214: E/XXX(10341): at android.os.Looper.loop(Looper.java:137) 07-02 17:28:04.214: E/XXX(10341): at android.app.ActivityThread.main(ActivityThread.java:4928) 07-02 17:28:04.214: E/XXX(10341): at java.lang.reflect.Method.invokeNative(Native Method) 07-02 17:28:04.214: E/XXX(10341): at java.lang.reflect.Method.invoke(Method.jav 07-02 17:28:04.214: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):位于com.common.TimePickerFragment.onTimeSet(TimePickerFragment.java:47)07-02 17:28:04.214:E / XXX(10341):位于android.app.TimePickerDialog.tryNotifyTimeSet(TimePickerDialog.java :130)07-02 17:28:04.214: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)07-02 17:28:04.214:E / XXX(10341):在android.os.Handler.dispatchMessage(Handler.java: 99)07-02 17:28:04.214:E / XXX(10341):at android.os.Looper.loop(Looper.java:137)07-02 17:28:04.214:E / XXX(10341):at android.app.ActivityThread.main(ActivityThread.java:4928)07-02 17:28:04.214:E / XXX(10341):at java.lang.reflect.Method.invokeNative(Native Method)07-02 17:28 :04.214:E / XXX(10341):at java.lang.reflect.Method.invoke(Method.jav a:511) 07-02 17:28:04.214: E/XXX(10341): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:791) 07-02 17:28:04.214: E/XXX(10341): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:558) 07-02 17:28:04.214: E/XXX(10341): at dalvik.system.NativeStart.main(Native Method) a:511)07-02 17:28:04.214:E / XXX(10341):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:791)07-02 17:28:04.214: 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)
You forget to initialize private TimePickedListener mListener;
您忘记初始化private TimePickedListener mListener;
Change your newInstance
method with : 使用以下命令更改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;
}
You didn't instantiate private TimePickedListener mListener;
您没有实例化private TimePickedListener mListener;
anywhere . 任何地方。 It is referencing to null
. 它引用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;
}
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