我正在使用选项卡布局。我在 fragment 类中定义了一些函数，但在从上下文项选择的方法调用函数时，它给出错误“未创建方法”。 我还在 onACtivity 方法中编写了代码，但没有工作。 请帮忙!
Java代码
public class Tab2 extends Fragment
{
TimePicker myTimePicker;
Button buttonstartSetDialog;
Button buttonstartEndDialog;
Button buttonCancelAlarm;
TextView textAlarmPrompt;
TextView textAlarmPrompt2;
TimePickerDialog timePickerDialog;
final static int RQS_1 = 1;
final static int RQS_2 = 2;
int FIRST_OPTION = 1;
int SECOND_OPTION = 2;
int Third_OPTION = 3;
int Fourth_OPTION = 4;
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.set_time,container,false);
return v;}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
textAlarmPrompt = (TextView)getView().findViewById(R.id.alarmprompt);
textAlarmPrompt2 = (TextView)getView().findViewById(R.id.alarmprompt2);
buttonstartSetDialog = (Button)getView().findViewById(R.id.startSetDialog);
buttonstartSetDialog.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
textAlarmPrompt.setText("");
openTimePickerDialog(false);
//buttonstartSetDialog.setClickable(false);
//buttonstartSetDialog.setClickable(false);
//buttonCancelAlarm.setClickable(true);
}
private void openTimePickerDialog(boolean is24r){
Calendar calendar = Calendar.getInstance();
timePickerDialog = new TimePickerDialog(
getActivity(),
onTimeSetListener,
calendar.get(Calendar.HOUR_OF_DAY),
calendar.get(Calendar.MINUTE),
is24r);
timePickerDialog.setTitle("Set Alarm Time");
timePickerDialog.show();
}
OnTimeSetListener onTimeSetListener
= new OnTimeSetListener(){
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
Calendar calNow = Calendar.getInstance();
Calendar calSet = (Calendar) calNow.clone();
calSet.set(Calendar.HOUR_OF_DAY, hourOfDay);
calSet.set(Calendar.MINUTE, minute);
calSet.set(Calendar.SECOND, 0);
calSet.set(Calendar.MILLISECOND, 0);
if(calSet.compareTo(calNow) <= 0){
//Today Set time passed, count to tomorrow
calSet.add(Calendar.DATE, 1);
}
setAlarm(calSet);
}};
private void setAlarm(Calendar targetCal){
textAlarmPrompt.setText(
"\n\n***\n"
+ "Alarm is set@ " + targetCal.getTime() + "\n"
+ "***\n");
Intent intent = new Intent(getActivity(), AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager)getActivity().getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent);
}
private void cancelAlarm(){
textAlarmPrompt.setText(
"\n\n***\n"
+ "Alarm Cancelled! \n"
+ "***\n");
Intent intent = new Intent(getActivity(), AlarmReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(getActivity(), RQS_1, intent, 0);
AlarmManager alarmManager = (AlarmManager)getActivity().getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(pendingIntent);
}});
//Registering Start Time Button for context menu
registerForContextMenu(buttonstartSetDialog);
buttonstartSetDialog.setOnCreateContextMenuListener(new OnCreateContextMenuListener()
{
@Override
public void onCreateContextMenu(ContextMenu menu, View arg1,
ContextMenuInfo arg2) {
menu.setHeaderTitle("Choose");
menu.add(0, FIRST_OPTION, 0, "Edit");
menu.add(0, SECOND_OPTION, 0, "Delete");
}
});
/********* Opening Time picker dialog from end time button *********/
buttonstartEndDialog = (Button)getView().findViewById(R.id.startEndDialog);
buttonstartEndDialog.setOnClickListener(new OnClickListener(){
@Override
public void onClick(View v) {
textAlarmPrompt2.setText("");
openTimePickerDialog2(false);
//buttonstartSetDialog.setClickable(false);
//buttonstartEndDialog.setClickable(false);
//buttonCancelAlarm.setClickable(true);
}
private void openTimePickerDialog2(boolean is24r){
Calendar calendar = Calendar.getInstance();
timePickerDialog = new TimePickerDialog(
getActivity(),
onTimeSetListener2,
calendar.get(Calendar.HOUR_OF_DAY),
calendar.get(Calendar.MINUTE),
is24r);
timePickerDialog.setTitle("Set Alarm Time");
timePickerDialog.show();
}
OnTimeSetListener onTimeSetListener2
= new OnTimeSetListener(){
@Override
public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
Calendar calNow = Calendar.getInstance();
Calendar calSet = (Calendar) calNow.clone();
calSet.set(Calendar.HOUR_OF_DAY, hourOfDay);
calSet.set(Calendar.MINUTE, minute);
calSet.set(Calendar.SECOND, 0);
calSet.set(Calendar.MILLISECOND, 0);
if(calSet.compareTo(calNow) <= 0){
//Today Set time passed, count to tomorrow
calSet.add(Calendar.DATE, 1);
}
setAlarm2(calSet);
}};
private void setAlarm2(Calendar targetCal){
textAlarmPrompt2.setText(
"\n\n***\n"
+ "Alarm is set@ " + targetCal.getTime() + "\n"
+ "***\n");
Intent intent2 = new Intent(getActivity(), AlarmReciever_for_Normal.class);
PendingIntent pendingIntent2 = PendingIntent.getBroadcast(getActivity(), RQS_2, intent2, 0);
AlarmManager alarmManager = (AlarmManager)getActivity().getSystemService(Context.ALARM_SERVICE);
alarmManager.set(AlarmManager.RTC_WAKEUP, targetCal.getTimeInMillis(), pendingIntent2);
//buttonstartSetDialog.setClickable(false);
//buttonCancelAlarm.setEnabled(false);
}
private void cancelAlarm2(){
textAlarmPrompt2.setText(
"\n\n***\n"
+ "Alarm Cancelled! \n"
+ "***\n");
Intent intent2 = new Intent(getActivity(), AlarmReciever_for_Normal.class);
PendingIntent pendingIntent2 = PendingIntent.getBroadcast(getActivity(), RQS_2, intent2, 0);
AlarmManager alarmManager = (AlarmManager)getActivity().getSystemService(Context.ALARM_SERVICE);
alarmManager.cancel(pendingIntent2);
}});
registerForContextMenu(buttonstartEndDialog);
buttonstartEndDialog.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {
@Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
menu.setHeaderTitle("Choose");
menu.add(0, Third_OPTION, 0, "Edit");
menu.add(0, Fourth_OPTION, 0, "Delete");
}});
}
@Override
public boolean onContextItemSelected(MenuItem item) {
int itemId = item.getItemId();
if(itemId == FIRST_OPTION){
openTimePickerDialog(false);
return true;
}
else if(itemId == SECOND_OPTION){
cancelAlarm();
return true;
}
else if(itemId == Third_OPTION){
openTimePickerDialog2(false);
return true;
}
else if(itemId == Fourth_OPTION){
cancelAlarm2();
return true;
}
return super.onContextItemSelected(item);
}
}
最佳答案
编辑: cancelAlarm() 定义在错误的位置，因为它位于 OnClickListener 内部，而其他方法看不到它。
将其视为与其他方法处于同一级别。另外，这样您将无法访问 onActivityCreated 中定义的某些变量，您应该为它们创建字段变量。
public class Tab2 extends Fragment
{
...
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container,
@Nullable Bundle savedInstanceState) {...}
@Override
public void onActivityCreated(Bundle savedInstanceState) {}
@Override
public void onCreateContextMenu(ContextMenu menu, View arg1, ContextMenuInfo arg2) {});
private void openTimePickerDialog(boolean is24r){...}
OnTimeSetListener onTimeSetListener = new OnTimeSetListener(){...};
private void setAlarm(Calendar targetCal){...}
private void cancelAlarm(){...}
}
关于java - 为什么不调用所选上下文项上的函数，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33210306/