我想在選擇日期后在文本視圖中設(shè)置日期，但它在我評論的行中拋出錯誤，如何修復(fù)它？在這里創(chuàng)建視圖public class MoonFragment extends Fragment {static { System.loadLibrary("native-lib");}@Nullable@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) { View view = inflater.inflate(R.layout.activity_moon, container, false); final TextView moon_ra = (TextView) view.findViewById(R.id.moon_ra); Button button = (Button) view.findViewById(R.id.moon_btn); button.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { moon_ra.setText(Double.toString(Aries(0.2))); } }); EditText moon_date = (EditText) view.findViewById(R.id.moon_date); moon_date.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { DialogFragment newFragment = new SelectDateFragment(); // It throws error here newFragment.show(getFragmentManager(), "DatePicker"); } }); return view; // return inflater.inflate(R.layout.activity_moon, container, false);}public native double Aries (double d);在這里，我參加了選擇日期的課程，它在第二行中拋出錯誤public static class SelectDateFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener { TextView moon_ra = (TextView)getActivity(). findViewById(R.id.moon_ra); // and here @Override public Dialog onCreateDialog(Bundle savedInstanceState) { final Calendar calendar = Calendar.getInstance(); int yy = calendar.get(Calendar.YEAR); int mm = calendar.get(Calendar.MONTH); int dd = calendar.get(Calendar.DAY_OF_MONTH); return new DatePickerDialog(getActivity(), this, yy, mm, dd); }也許還有其他方法可以在文本視圖中設(shè)置日期？
2 回答
慕森卡
TA貢獻1806條經(jīng)驗 獲得超8個贊
顯然#getActivity() 在附加片段之前為空。
您應(yīng)該嘗試將賦值代碼放在#onCreateDialog()方法中：
TextView moon_ra;
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
final Calendar calendar = Calendar.getInstance();
int yy = calendar.get(Calendar.YEAR);
int mm = calendar.get(Calendar.MONTH);
int dd = calendar.get(Calendar.DAY_OF_MONTH);
moon_ra = (TextView)getActivity().findViewById(R.id.moon_ra);
return new DatePickerDialog(getActivity(), this, yy, mm, dd);
}
慕絲7291255
TA貢獻1859條經(jīng)驗 獲得超6個贊
您可以使用從到onActivityResult()傳遞數(shù)據(jù)，如下所示。SelectDateFragmentMoonFragment
SelectDateFragment如下所示在您的內(nèi)部調(diào)用MoonFragment。
moon_date.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View v) {
DialogFragment newFragment = new SelectDateFragment();
newFragment.setTargetFragment(this, 111); // add this line
newFragment.show(getFragmentManager(), "DatePicker");
}
});
發(fā)送數(shù)據(jù)從SelectDateFragment到MoonFragment新日期設(shè)置時
public void populateSetDate(int year, int month, int day) {
String newDate = month+"/"+day+"/"+year;
Intent intent = new Intent();
intent.putStringExtra("date", newDate);
getTargetFragment().onActivityResult(getTargetRequestCode(), 111, intent);
}
要接收數(shù)據(jù)，請使用onActivityResult您的MoonFragment
public void onActivityResult(int requestCode, int resultCode, Intent data) {
if (requestCode == 111) {
String newDate = data.getStringExtra("date");
// here you can update your textview
moon_ra.setText(newDate); // make sure your moon_ra textview is decleared globally
}
}
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