如何让 Interface Bundle 将之前的日期传递给 DatePickerDialog？

Question

我有一个在片段中打开的 DatePickerDialog。首次打开时，对话框的默认日期显示今天的日期。然后用户选择一个日期。当对话框关闭时，我设置了一个带有用户选择日期的 EditText 行。

下次打开对话框时（因为用户想要编辑他们之前选择的日期），我想将用户之前选择的日期显示为默认日期，而不是今天的日期。我已经使用 Bundle 设置了一个从片段到 activity 的接口。此外，不确定我在 Fragment 的 OnCreateDialog 中对 "year" 的空值测试是否正常工作。请指教。

部分 DatePickerFragment 文件：

public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {

private int currentyear;
private int currentmonth;
private int currentday;

public DatePickerFragment() {
}

public interface OnDateEnteredListener {
     void OnDateEntered(int year, int month, int day);
}
OnDateEnteredListener mListener;


// Set up a Calendar object that will capture the current date for the DatePickerDialog to use.
Calendar cal = Calendar.getInstance();

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {

    final Bundle datebundle = this.getArguments();
    currentyear = datebundle.get(Calendar.YEAR);
    currentmonth = datebundle.get(Calendar.MONTH);
    currentday = datebundle.get(Calendar.DAY_OF_MONTH);

if(currentyear != 0){
        DatePickerDialog dateDialog = new DatePickerDialog(this.getActivity(), this, currentyear, currentmonth, currentday);
        dateDialog.getDatePicker().setCalendarViewShown(true);
        dateDialog.getDatePicker().setSpinnersShown(false);
        dateDialog.setTitle("Select a Due Date");
        return dateDialog;
    }
    else {
        // Create three variables to capture the current date.
        currentyear = cal.get(Calendar.YEAR);
        currentmonth = cal.get(Calendar.MONTH);
        currentday = cal.get(Calendar.DAY_OF_MONTH);
        // Create a DatePickerDialog which is a simple dialog containing a DatePicker.  Use the current date
        // as the default date in the DatePicker.  The new instance of DatePickerDialog is created by passing
        // 5 parameters/arguments to the constructor and returning it.
        DatePickerDialog dateDialog = new DatePickerDialog(this.getActivity(), this, currentyear, currentmonth, currentday);
        dateDialog.getDatePicker().setCalendarViewShown(true);
        dateDialog.getDatePicker().setSpinnersShown(false);
        dateDialog.setTitle("Select a Due Date");
        return dateDialog;
    }
}


public void onDateSet (DatePicker view,int year, int month, int day) {
     mListener.OnDateEntered(year,month,day);
...

@Override
public void onAttach(Activity activity) {
    super.onAttach(activity);
}

部分Activity文件：

public class Activity extends AppCompatActivity implements DatePickerFragment.OnDateEnteredListener {

  int currentyear;
  int currentmonth;
  int currentday;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.input);

    fListenerEditText = (ListenerEditText) findViewById(R.id.FEditText);

    fListenerEditText.setOnFocusChangeListener(new OnFocusChangeListener() {
        @Override
        public void onFocusChange(View v, boolean hasFocus) {
        if (hasFocus && (fListenerEditText.getText().length() == 0)) {
        DialogFragment newFragment = new DatePickerFragment();
        Bundle datebundle = new Bundle();
              datebundle.putInt("YEAR", currentyear);
              datebundle.putInt("MONTH", currentmonth);
              datebundle.putInt("DAY", currentday);
              newFragment.setArguments(datebundle);
              newFragment.show(getSupportFragmentManager(), "datePicker");
           }
        }
    });

  @Override
  public void onDateEntered(int year, int month, int day) {
    Toast toast = Toast.makeText(getApplicationContext(), "Test", Toast.LENGTH_LONG);
    toast.show();
    }
}

Answer 1

如果找不到以前的日期，使用 cal.get()
用户 select 日期，将 EditText 设置为 select 编辑的日期。
如果找到以前的日期，将文本从 EditText 解析为日期格式，使用 cal.set() 将其设置为当前日期，并使用 cal.get() 显示对话框

您可以使用.matches()方法检查EditText是否为空。

例如，

if(txtDate.getText().toString().matches(""))
         // txtDate was empty

如何让 Interface Bundle 将之前的日期传递给 DatePickerDialog？

How do I get Interface Bundle to deliver previous date to DatePickerDialog?

android

bundle

date

android-datepicker

android-fragments