永久设置DatePickerDialog标题

Question

我在尝试永久设置DatePickerDialog标题时遇到问题。

DatePickerFragment.java

public class DatePickerFragment extends DialogFragment implements DatePickerDialog.OnDateSetListener {

    @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
    DatePickerDialog dpd = new DatePickerDialog(getActivity(), this, year, month, day);
    dpd.setTitle("set date");
    return dpd;
    }

    public void onDateSet(DatePicker view, int year, int month, int day) {
    // Do something with the date chosen by the user
    }
}

MainActivity.java

public class MainActivity extends FragmentActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btn = (Button) findViewById(R.id.button1);

        btn.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                DialogFragment newFragment = new DatePickerFragment();
                newFragment.show(getSupportFragmentManager(), "datePicker");

            }
        });
    }
}

当我点击按钮DatePickerDialog时，显示对话框标题为"set date“，但当我更改日期时，标题包含所选日期而不是"set date”。如何永久设置此对话框标题？

在API 8-10上测试。

提前感谢您，并为我的英语表达歉意。帕特里克

Answer 1

如何扩展DatePickerDialog并添加一个setPermanentTitle方法来存储在日期更改时强制执行的永久标题？

public class MyDatePickerDialog extends DatePickerDialog {

    private CharSequence title;

    public MyDatePickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {
        super(context, callBack, year, monthOfYear, dayOfMonth);
    }

    public void setPermanentTitle(CharSequence title) {
        this.title = title;
        setTitle(title);
    }

    @Override
    public void onDateChanged(DatePicker view, int year, int month, int day) {
        super.onDateChanged(view, year, month, day);
        setTitle(title);
    }
}

然后使用新的setPermanentTitle方法：

    MyDatePickerDialog dpd = new MyDatePickerDialog(this, null, 2012, 10, 10);
    dpd.setPermanentTitle("set date");

Answer 2

扩展DatePickerDialog并覆盖setTitle()方法。

public class MyDatePickerDialog extends DatePickerDialog {

   public MyDatePickerDialog(Context context, OnDateSetListener callBack, int year, int monthOfYear, int dayOfMonth) {
       super(context, callBack, year, monthOfYear, dayOfMonth);
   }

   public void setTitle(CharSequence title) {
       super.setTitle(*<whatever title you want>*);
   }
}

Answer 3

您可以始终使用AlertDialog并调用setView来传递DatePicker的实例。

参见下面的示例代码：

DatePicker datePicker = new DatePicker(getActivity());
    datePicker.setCalendarViewShown(false);

new AlertDialog.Builder(getActivity())
    .setTitle("Your title")
    .setView(datePicker)
    .create().show();

这将确保标题仅由您设置。