我有以下代码在 Activity 中显示日期选择器，但是当我尝试将 Activity 转换为 fragment 时，出现错误。我真的看不出代码与用于在Fragment内实现DialogFragment的解决方案相比有什么区别。
你能指出我想念的是什么吗？
MainFragment:
public class AddEntryFragment extends Fragment implements DatePickerFragment.TheListener{
EditText datpurchased;
public AddEntryFragment(){}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_addentry, container, false);
return rootView;
}
@Override
public void onStart() {
super.onStart();
datpurchased = (EditText) getView().findViewById(R.id.datepurchased);
datpurchased.setOnClickListener(onClickListener);
}
private OnClickListener onClickListener = new OnClickListener() {
@Override
public void onClick(View v) {
switch(v.getId()){
case R.id.datepurchased:
showdate(v);
break;
default:
break;
}
}
};
public void showdate(View v) {
DialogFragment newFragment = new DatePickerFragment();
Bundle bundle = new Bundle();
bundle.putString("dateAsText",datpurchased.getText().toString());
newFragment.setArguments(bundle);
newFragment.show(getFragmentManager(), "datePicker");
}
public void returnDate(String date) {
datpurchased.setText(date);
}
}
DatePickerFragment:
public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {
TheListener listener;
public interface TheListener{
public void returnDate(String date);
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState){
Bundle bundle = getArguments();
String date = bundle.getString("dateAsText");
int year, month, day;
SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd",Locale.US);
df.setLenient(false);
Date d = null;
Calendar c=Calendar.getInstance();
try {
d = df.parse(date);
c.setTime(d);
} catch (ParseException e) {
//e.printStackTrace();
}
year=c.get(Calendar.YEAR);
month=c.get(Calendar.MONTH);
day=c.get(Calendar.DAY_OF_MONTH);
listener = (TheListener) getActivity();
return new DatePickerDialog(getActivity(), this, year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day){
Calendar c = Calendar.getInstance();
c.set(year, month, day);
SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd",Locale.US);
String formattedDate = sdf.format(c.getTime());
if (listener != null)
{
listener.returnDate(formattedDate);
}
}
}
LogCat:
12-18 23:35:41.094: D/AndroidRuntime(1058): Shutting down VM
12-18 23:35:41.094: W/dalvikvm(1058): threadid=1: thread exiting with uncaught exception (group=0xb4a65b90)
12-18 23:35:41.124: E/AndroidRuntime(1058): FATAL EXCEPTION: main
12-18 23:35:41.124: E/AndroidRuntime(1058): Process: com.migrationdesk.mylibman, PID: 1058
12-18 23:35:41.124: E/AndroidRuntime(1058): java.lang.ClassCastException: com.migrationdesk.mylibman.NavContainer cannot be cast to com.migrationdesk.mylibman.DatePickerFragment$TheListener
12-18 23:35:41.124: E/AndroidRuntime(1058): at com.migrationdesk.mylibman.DatePickerFragment.onCreateDialog(DatePickerFragment.java:41)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.app.DialogFragment.getLayoutInflater(DialogFragment.java:398)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:890)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1062)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.app.BackStackRecord.run(BackStackRecord.java:684)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1447)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.app.FragmentManagerImpl$1.run(FragmentManager.java:443)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.os.Handler.handleCallback(Handler.java:733)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.os.Handler.dispatchMessage(Handler.java:95)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.os.Looper.loop(Looper.java:137)
12-18 23:35:41.124: E/AndroidRuntime(1058): at android.app.ActivityThread.main(ActivityThread.java:4998)
12-18 23:35:41.124: E/AndroidRuntime(1058): at java.lang.reflect.Method.invokeNative(Native Method)
12-18 23:35:41.124: E/AndroidRuntime(1058): at java.lang.reflect.Method.invoke(Method.java:515)
12-18 23:35:41.124: E/AndroidRuntime(1058): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:777)
12-18 23:35:41.124: E/AndroidRuntime(1058): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:593)
12-18 23:35:41.124: E/AndroidRuntime(1058): at dalvik.system.NativeStart.main(Native Method)
最佳答案
试试这个示例代码。
public class student extends Fragment {
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View view= inflater.inflate(R.layout.layout_main, container, false);
return view;
}
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
edittext.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
showDatePicker();
}
});
}
private void showDatePicker() {
DatePickerFragment date = new DatePickerFragment();
/**
* Set Up Current Date Into dialog
*/
Calendar calender = Calendar.getInstance();
Bundle args = new Bundle();
args.putInt("year", calender.get(Calendar.YEAR));
args.putInt("month", calender.get(Calendar.MONTH));
args.putInt("day", calender.get(Calendar.DAY_OF_MONTH));
date.setArguments(args);
/**
* Set Call back to capture selected date
*/
date.setCallBack(ondate);
date.show(getFragmentManager(), "Date Picker");
}
OnDateSetListener ondate = new OnDateSetListener() {
public void onDateSet(DatePicker view, int year, int monthOfYear,
int dayOfMonth) {
edittext.setText(String.valueOf(dayOfMonth) + "-" + String.valueOf(monthOfYear+1)
+ "-" + String.valueOf(year));
}
};
}
创建另一个类DatePickerFragment。
public class DatePickerFragment extends DialogFragment {
OnDateSetListener ondateSet;
private int year, month, day;
public DatePickerFragment() {}
public void setCallBack(OnDateSetListener ondate) {
ondateSet = ondate;
}
@SuppressLint("NewApi")
@Override
public void setArguments(Bundle args) {
super.setArguments(args);
year = args.getInt("year");
month = args.getInt("month");
day = args.getInt("day");
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return new DatePickerDialog(getActivity(), ondateSet, year, month, day);
}
}