我是Android开发的新手。我希望你能帮助我如何将从dialogfragment中检索到的数据保存到我的数据库。我当前的代码能够保存数据，但只保存当前日期而不是所选日期。
public class RemindersFragment extends Fragment {
private EditText mTitleText;
private EditText mBodyText;
public static final String DATE_TIME_FORMAT = "yyyy-MM-dd kk:mm:ss";
private Button mConfirmButton;
private Long mRowId;
private RemindersDbAdapter mDbHelper;
private Calendar mCalendar;
Button btnChangeDate,btnChangeTime;
TextView txtDisplayDate,txtDisplayTime;
private int year;
private int month;
private int day;
private int hour;
private int minute;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
mDbHelper = new RemindersDbAdapter(getActivity());
View rootView = inflater.inflate(R.layout.fragment_reminders, container, false);
mCalendar = Calendar.getInstance();
mTitleText = (EditText) rootView.findViewById(R.id.title);
mBodyText = (EditText) rootView.findViewById(R.id.body);
mConfirmButton = (Button) rootView.findViewById(R.id.confirm);
btnChangeDate = (Button) rootView.findViewById(R.id.btnChangeDate);
btnChangeTime = (Button) rootView.findViewById(R.id.btnChangeTime);
txtDisplayTime = (TextView) rootView.findViewById(R.id.txtTime);
txtDisplayDate = (TextView) rootView.findViewById(R.id.txtDate);
mRowId = savedInstanceState != null ? savedInstanceState.getLong(RemindersDbAdapter.KEY_ROWID)
: null;
registerButtonListenersAndSetDefaultText();
btnChangeDate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showDatePickerDialog();
}
});
btnChangeTime.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
showTimePickerDialog();
}
});
return rootView;
}
// display current date
public void showCurrentDateOnView() {
year = mCalendar.get(Calendar.YEAR);
month = mCalendar.get(Calendar.MONTH);
day = mCalendar.get(Calendar.DAY_OF_MONTH);
// set current date into textview
txtDisplayDate.setText(new StringBuilder()
// Month is 0 based, just add 1
.append(month + 1).append("-").append(day).append("-")
.append(year).append(" "));
}
// display current time
public void showCurrentTimeOnView() {
hour = mCalendar.get(Calendar.HOUR_OF_DAY);
minute = mCalendar.get(Calendar.MINUTE);
// set current time into textview
txtDisplayTime.setText(
new StringBuilder().append(hour)
.append(":").append(minute));
}
private void setRowIdFromIntent() {
if (mRowId == null) {
Bundle extras = getActivity().getIntent().getExtras();
mRowId = extras != null ? extras.getLong(RemindersDbAdapter.KEY_ROWID)
: null;
}
}
public void showDatePickerDialog() {
DatePickerFragment newFragment = new DatePickerFragment(txtDisplayDate);
newFragment.show(getFragmentManager(), "datePicker");
}
public void showTimePickerDialog() {
TimePickerFragment newFragment = new TimePickerFragment(txtDisplayTime);
newFragment.show(getFragmentManager(), "timePicker");
}
@Override
public void onPause() {
super.onPause();
mDbHelper.close();
}
@Override
public void onResume() {
super.onResume();
mDbHelper.open();
setRowIdFromIntent();
populateFields();
}
private void registerButtonListenersAndSetDefaultText() {
mConfirmButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
Intent intent;
saveState();
getActivity().setResult(Activity.RESULT_OK);
Toast.makeText(getActivity(), getString(R.string.task_saved_message), Toast.LENGTH_SHORT).show();
intent = new Intent(getActivity().getApplication(), Manage_Settings.class);
startActivity(intent);
}
});
showCurrentDateOnView();
showCurrentTimeOnView();
}
private void populateFields() {
// Only populate the text boxes and change the calendar date
// if the row is not null from the database.
if (mRowId != null) {
Cursor reminder = mDbHelper.fetchReminder(mRowId);
getActivity().startManagingCursor(reminder);
mTitleText.setText(reminder.getString(
reminder.getColumnIndexOrThrow(RemindersDbAdapter.KEY_TITLE)));
mBodyText.setText(reminder.getString(
reminder.getColumnIndexOrThrow(RemindersDbAdapter.KEY_BODY)));
// Get the date from the database and format it for our use.
SimpleDateFormat dateTimeFormat = new SimpleDateFormat(DATE_TIME_FORMAT);
Date date = null;
try {
String dateString = reminder.getString(reminder.getColumnIndexOrThrow(RemindersDbAdapter.KEY_DATE_TIME));
date = dateTimeFormat.parse(dateString);
mCalendar.setTime(date);
} catch (ParseException e) {
Log.e("ReminderEditActivity", e.getMessage(), e);
}
} else {
// This is a new task - add defaults from preferences if set.
SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
String defaultTitleKey = getString(R.string.pref_task_title_key);
String defaultTimeKey = getString(R.string.pref_default_time_from_now_key);
String defaultTitle = prefs.getString(defaultTitleKey, null);
String defaultTime = prefs.getString(defaultTimeKey, null);
if(defaultTitle != null)
mTitleText.setText(defaultTitle);
if(defaultTime != null)
mCalendar.add(Calendar.MINUTE, Integer.parseInt(defaultTime));
}
showCurrentDateOnView();
showCurrentTimeOnView();
}
@Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putLong(RemindersDbAdapter.KEY_ROWID, mRowId);
}
@SuppressLint("SimpleDateFormat")
private void saveState() {
String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString();
SimpleDateFormat dateTimeFormat = new SimpleDateFormat(DATE_TIME_FORMAT);
String reminderDateTime = dateTimeFormat.format(mCalendar.getTime());
if (mRowId == null) {
long id = mDbHelper.createReminder(title, body, reminderDateTime);
if (id > 0) {
mRowId = id;
}
} else {
mDbHelper.updateReminder(mRowId, title, body, reminderDateTime);
}
new ReminderManager(getActivity()).setReminder(mRowId, mCalendar);
}
}
这是我的Datepicker DialogFragment：
public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener{
TextView txtDate;
public DatePickerFragment(TextView txtDate) {
super();
this.txtDate = txtDate;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
// Use the current date as the default date in the picker
final Calendar c = Calendar.getInstance();
int year = c.get(Calendar.YEAR);
int month = c.get(Calendar.MONTH);
int day = c.get(Calendar.DAY_OF_MONTH);
// Create a new instance of DatePickerDialog and return it
return new DatePickerDialog(getActivity(), this, year, month, day);
}
public void onDateSet(DatePicker view, int year, int month, int day) {
//DatePickerFragmentListener listener = (DatePickerFragmentListener) getTargetFragment();
txtDate.setText(new StringBuilder().append(month + 1)
.append("-").append(day).append("-").append(year)
.append(" "));
}
}
到目前为止我做了什么：
我试图在当前日期设置mCalendar，但我认为我做得不对：
// display current date
public void showCurrentDateOnView() {
year = mCalendar.get(Calendar.YEAR);
month = mCalendar.get(Calendar.MONTH);
day = mCalendar.get(Calendar.DAY_OF_MONTH);
mCalendar.set(Calendar.YEAR, year);
mCalendar.set(Calendar.MONTH, month);
mCalendar.set(Calendar.DAY_OF_MONTH, day);
// set current date into textview
txtDisplayDate.setText(new StringBuilder()
// Month is 0 based, just add 1
.append(month + 1).append("-").append(day).append("-")
.append(year).append(" "));
}
任何帮助都将受到高度赞赏。
答案 0 :(得分：0)
也许你应该从类DatePickerFragment中的DatePickerDialog覆盖onDateChanged方法（DatePicker视图，int year，int month，int day）。
并输入您的代码
txtDisplayDate.setText(new StringBuilder()
// Month is 0 based, just add 1
.append(month + 1).append("-").append(day).append("-")
.append(year).append(" "));
进入该方法。
我当前的代码可以保存数据，但只保存当前日期而不是所选日期。
所以，我想也许你的问题是你无法获得所选的日期。
我建议您覆盖子类DatePickerDialog的方法 http://developer.android.com/reference/android/app/DatePickerDialog.html
DatePickerDialog已经实现了OnDateChangedListener，因此它可以处理日期更改内容。而你只是使用它。
你在DatePickerFragment中定义了一个方法onDateSet（DatePicker视图，int year，int month，int day），我担心它不起作用。
希望我说清楚答案 1 :(得分：0)
我在我的一个应用程序中完成它的方式是： 1）就像你一样，我有一个TextField来存储日期。所以我创建了setOnFocusChangeListener＆amp; setOnClickListener将创建一个DatePickerDialog，我们可以滚动它来设置我们的日期。
txtDOB.setOnFocusChangeListener(new OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus){
CallenderCall();
}
}
});
txtDOB.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CallenderCall();
}
});
正如你所看到的，我在他们里面叫CallenderCall（）;这是：
public void CallenderCall(){
//Creates new instance of calendar, get current Year, Month and Day and use it as default values for the Date Picker Dialog.
final Calendar c = Calendar.getInstance();
todayYear = c.get(Calendar.YEAR);
todayMonth = c.get(Calendar.MONTH);
todayDay = c.get(Calendar.DAY_OF_MONTH);
DatePickerDialog dpdFromDate = new DatePickerDialog(getActivity(), mDateSetListener, todayYear, todayMonth, todayDay);
dpdFromDate.show();
}
我们可以看到这个CallenderCall会创建DatePickerDialog，因此需要另外一个函数来使它全部工作：
private DatePickerDialog.OnDateSetListener mDateSetListener = new DatePickerDialog.OnDateSetListener() {
// onDateSet method
public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
if (year > todayYear || year >= todayYear && monthOfYear > todayMonth || year >= todayYear && monthOfYear >= todayMonth && dayOfMonth > todayDay) {
Toast.makeText(getActivity().getApplicationContext(), "Date of Birth can't be from the future ;)", Toast.LENGTH_LONG).show();
txtDOB.setText("");
}else{
dateOfBirth = String.valueOf(dayOfMonth) + "/" + String.valueOf(monthOfYear+1) + "/" + String.valueOf(year);
txtDOB.setText(dateOfBirth);
Log.v("MAD","Date: "+dateOfBirth);
}
}
}; // DatePickerDialog.OnDateSetListener close
现在，您将在文本框中将日期作为字符串，您可以将其保存在数据库中。我希望它会有所帮助。