如何在android中的日期选择器小部件中添加新按钮？

我想在我的android应用程序中添加一个新的按钮，即clear按钮，用于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，set和cancel。如何在这两个按钮上再添加一个按钮

可能吗？如果是，你能举一些例子吗

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谢谢

这就是我在应用程序中实现“清除”按钮的方式。当用户单击“清除”时，年/月/日值均为0。您可以通过这种方式在应用程序中使用onDateSet（）来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）

我还利用了他的帮助

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只需创建这个类

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();
    }
});

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看起来像这样

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享受：）

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
    }
});

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这个问题还提到了在计时器上添加一个清除按钮，这就是我来这里的原因

对于任何感兴趣的人来说，下面是如何在对话框片段中为时间选择器执行此操作

import android.app.Dialog;
import android.app.DialogFragment;
import android.app.TimePickerDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.TimePicker;

import java.util.Calendar;

public class TimePickerFragment extends DialogFragment implements TimePickerDialog.OnTimeSetListener, TimePickerDialog.OnClickListener {

    private static final String HOURS_ARG_KEY = "hours";
    private static final String MINUTES_ARG_KEY = "minutes";
    private static final String TARGET_ARG_KEY = "target";

    public static TimePickerFragment newInstance(int hours, int minutes, int targetResId,...other values...) {
        TimePickerFragment tpf = new TimePickerFragment();
        Bundle args = new Bundle();

        //Setup the TimePickerFragment with some args if required.

        args.putInt(HOURS_ARG_KEY, hours);
        args.putInt(MINUTES_ARG_KEY, minutes);
        args.putInt(TARGET_ARG_KEY, targetResId);
        tpf.setArguments(args);

        return tpf;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        // Use the current time as the default values for the picker if we get nothing from
        // from the arguments.
        final Calendar c = Calendar.getInstance();

        int hour = getArguments().getInt(HOURS_ARG_KEY,c.get(Calendar.HOUR_OF_DAY));
        int minute = getArguments().getInt(MINUTES_ARG_KEY, c.get(Calendar.MINUTE));

        // Create a new instance of TimePickerDialog and return it
        TimePickerDialog tpd = new TimePickerDialog(getActivity(), this, hour, minute, false);

        // And add the third button to clear the target field.
        tpd.setButton(DialogInterface.BUTTON_NEUTRAL,getActivity().getText(R.string.clear), this);

        return tpd;
    }

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        // Do something with the time chosen by the user

        int target = getArguments().getInt(TARGET_ARG_KEY,0);

        //Get reference of host activity (XML Layout File) TextView widget
        TextView txt = (TextView) getActivity().findViewById(target);
        //Format the hourOfDay and minute values, then display the user changed time on the TextView
        txt.setText(...FORMATTED TIME...);
    }


    @Override
    public void onClick(DialogInterface dialog, int which) {
        if(which == DialogInterface.BUTTON_NEUTRAL) {
            int target = getArguments().getInt(TARGET_ARG_KEY,0);

            //Get reference of host activity (XML Layout File) TextView widget
            TextView txt = (TextView) getActivity().findViewById(target);
            //Clear the field.
            txt.setText("");
        }
    }
}

然后，从活动中加载它：

TimePickerFragment tpf = TimePickerFragment.newInstance(...args...);
tpf.show(getFragmentManager(), "timePicker");

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假设您想添加一个名为CLEAR的新按钮，该按钮将清除选定的日期

 val calendar = Calendar.getInstance()
            val yy = calendar.get(Calendar.YEAR)
            val mm = calendar.get(Calendar.MONTH)
            val dd = calendar.get(Calendar.DAY_OF_MONTH)
            val datePicker = DatePickerDialog(this, DatePickerDialog.OnDateSetListener { _, year, monthOfYear, dayOfMonth ->
                val date = (dayOfMonth.toString() + "-" + (monthOfYear + 1).toString() + "-" + year.toString())
                et_date.setText(date)
            }, yy, mm, dd)
            datePicker.setButton(DialogInterface.BUTTON_NEUTRAL, "CLEAR") { dialog, which ->
                if (which == DialogInterface.BUTTON_NEUTRAL) {
                    et_date.setText("")
                }
            }
            datePicker.show()

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注意：以上代码是用kotlin语言编写的。

感谢您提供此代码，但在ICS中，清除和设置按钮始终无法正常工作您保存了我的一天，伙计！！

 val calendar = Calendar.getInstance()
            val yy = calendar.get(Calendar.YEAR)
            val mm = calendar.get(Calendar.MONTH)
            val dd = calendar.get(Calendar.DAY_OF_MONTH)
            val datePicker = DatePickerDialog(this, DatePickerDialog.OnDateSetListener { _, year, monthOfYear, dayOfMonth ->
                val date = (dayOfMonth.toString() + "-" + (monthOfYear + 1).toString() + "-" + year.toString())
                et_date.setText(date)
            }, yy, mm, dd)
            datePicker.setButton(DialogInterface.BUTTON_NEUTRAL, "CLEAR") { dialog, which ->
                if (which == DialogInterface.BUTTON_NEUTRAL) {
                    et_date.setText("")
                }
            }
            datePicker.show()