android - 单击取消按钮上的日期选择器对话框时如何完成 Activity

Question

我已经在我的 Activity 中实现了日期选择器对话框，它工作正常。当我单击取消时，选择器被关闭，因此按钮可以工作。但是我想捕获取消按钮事件并向其添加更多代码以完成 Activity ，但我似乎无法处理它。这是我的代码:

public class DatePickerActivity extends Activity {
    static final int DATE_PICKER_ID = 1111;
    private int year;
    private int month;
    private int day;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_date_picker);
        // Get current date by calender

        final Calendar c = Calendar.getInstance();
        year  = c.get(Calendar.YEAR);
        month = c.get(Calendar.MONTH);
        day   = c.get(Calendar.DAY_OF_MONTH);

        showDialog(DATE_PICKER_ID);
    }
    @Override
    protected Dialog onCreateDialog(int id) {
        switch (id) {
            case DATE_PICKER_ID:

                // open datepicker dialog.
                // set date picker for current date
                // add pickerListener listner to date picker
                return new DatePickerDialog(this, pickerListener, year, month,day);
        }
        return null;
    }

    private DatePickerDialog.OnDateSetListener pickerListener = new DatePickerDialog.OnDateSetListener() {

        // when dialog box is closed, below method will be called.
        @Override
        public void onDateSet(DatePicker view, int selectedYear,
                              int selectedMonth, int selectedDay) {

            year  = selectedYear;
            month = selectedMonth;
            day   = selectedDay;

            // Show selected date
            Log.d("Date selected", String.valueOf(new StringBuilder().append(month + 1)
                    .append("-").append(day).append("-").append(year)
                    .append(" ")));

            Intent intent = new Intent();
            intent.putExtra("year", String.valueOf(new StringBuilder().append(year )));
            intent.putExtra("month", String.valueOf(new StringBuilder().append(month + 1)));
            intent.putExtra("day",  String.valueOf(new StringBuilder().append(day)));
            setResult(RESULT_OK, intent);
            finish();

        }
    };
}

我尝试的是添加这个 onclick 方法，例如:

 public void onClick(DialogInterface dialog, int which) {
        // TODO Auto-generated method stub

        if(which==Dialog.BUTTON_NEGATIVE)
        {
            Log.i("dialog click", "dialog negative button clicked");
            dialog.dismiss();
        }

    }

但这行不通。有什么建议吗？

Answer 1

为 DatePickerDialog 创建一个类并从 onCreate() 中调用它，如下所示:

public class DatePickerFragment extends DialogFragment
        implements DatePickerDialog.OnDateSetListener{

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState){
        final Calendar calendar = Calendar.getInstance();
        int year = calendar.get(Calendar.YEAR);
        int month = calendar.get(Calendar.MONTH);
        int day = calendar.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog dpd = new DatePickerDialog(getActivity(),
                AlertDialog.THEME_HOLO_LIGHT,this,year,month,day);

        // Return the DatePickerDialog
        return  dpd;
    }

    public void onDateSet(DatePicker view, int year, int month, int day){
        // Your code here
    }

    // Set a Listener for Dialog Cancel button click event
    /*
        onCancel(DialogInterface dialog)
            This method will be invoked when the dialog is canceled.
     */
    public void onCancel(DialogInterface dialog){
        // Send a message to confirm cancel button click
        Toast.makeText(getActivity(),"Date Picker Canceled.", Toast.LENGTH_SHORT).show();
    }
}

从onCreate()调用它

 @Override
   protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_date_picker);
        DialogFragment dFragment = new DatePickerFragment();
        // Show the date picker dialog fragment
        dFragment.show(getFragmentManager(), "Date Picker");
   }