如何在android中的日期选择器小部件中添加新按钮？

Question

我想在我的Android应用程序中添加新按钮,这是清除按钮,日期选择器小部件和时间选择器小部件.默认情况下,这些小部件有两个按钮,设置和取消.如何在这两个按钮上再添加一个按钮

可能吗？如果是的话,你能举个例子吗？

谢谢

Answer 1

只需添加一个中性按钮.

DatePickerDialog dialog = new DatePickerDialog(context, 0, callback, year, month, day);
dialog.setButton(DialogInterface.BUTTON_NEUTRAL, "Name", new DialogInterface.OnClickListener() {
    @Override
    public void onClick(DialogInterface dialog, int which) {
        //Your code
    }
});

Answer 2

只需创建这个课程!

import android.app.DatePickerDialog;
import android.content.Context;

public class DatePickerWithNeutral extends DatePickerDialog {

    public DatePickerWithNeutral(Context context, OnDateSetListener callBack,
                            int year, int monthOfYear, int dayOfMonth) {
        super(context, 0, callBack, year, monthOfYear, dayOfMonth);

        setButton(BUTTON_POSITIVE, ("Ok"), this);
        setButton(BUTTON_NEUTRAL, ("Something"), this); // ADD THIS
        setButton(BUTTON_NEGATIVE, ("Cancel"), this);
    }
}

然后使用它来添加功能!

date.getButton(AlertDialog.BUTTON_NEUTRAL).setOnClickListener(
        new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        Toast.makeText(getApplicationContext(), "Neutral Button Clicked!", 
            Toast.LENGTH_LONG).show();
    }
});

看起来像这样

请享用 :)

Answer 3

这就是我在我的应用程序中实现“清除”按钮的方式。当用户单击清除时，年/月/日值全部为 0。您可以在您的应用程序中使用 onDateSet() 以这种方式设置按钮和清除按钮。

我引用了 Android 源代码 (\frameworks\base\core\java\android\app\DatePickerDialog.java)。

我也使用了esilver的帮助。

public class DatePickerDialogPlus extends DatePickerDialog {
    private final DatePicker mDatePicker;
    private final OnDateSetListener mCallBack;

    /**
     * @param context The context the dialog is to run in.
     * @param callBack How the parent is notified that the date is set.
     * @param year The initial year of the dialog.
     * @param monthOfYear The initial month of the dialog.
     * @param dayOfMonth The initial day of the dialog.
     */
    public DatePickerDialogPlus(Context context, OnDateSetListener callBack, 
            int year, int monthOfYear, int dayOfMonth) {
        super(context, 0, callBack, year, monthOfYear, dayOfMonth);

        mCallBack = callBack;

        Context themeContext = getContext();
        setButton(BUTTON_POSITIVE, 
            themeContext.getText(R.string.datePicker_setButton), this);
        setButton(BUTTON_NEUTRAL, 
            themeContext.getText(R.string.datePicker_clearButton), this);
        setButton(BUTTON_NEGATIVE, 
            themeContext.getText(R.string.datePicker_cancelButton), null);
        setIcon(0);
        setTitle(R.string.datePicker_title);

        LayoutInflater inflater = (LayoutInflater) 
            themeContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = inflater.inflate(R.layout.date_picker_dialog, null);
        setView(view);
        mDatePicker = (DatePicker) view.findViewById(R.id.datePicker);
        mDatePicker.init(year, monthOfYear, dayOfMonth, this);
    }

    @Override
    public void onClick(DialogInterface dialog, int which) {
        if (mCallBack != null) {
            if (which == BUTTON_POSITIVE) {
                mDatePicker.clearFocus();
                mCallBack.onDateSet(mDatePicker, mDatePicker.getYear(), 
                    mDatePicker.getMonth(), mDatePicker.getDayOfMonth());
            } else if (which == BUTTON_NEUTRAL) {
                mDatePicker.clearFocus();
                mCallBack.onDateSet(mDatePicker, 0, 0, 0);
            }
        }
    }
}