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I am trying to create a custom date picker button component. The button displays the date and when clicked it opens the date picker dialog box. I have implemented this method using the Android Dev Docs/Tutorial however I have 2 of them in my code and I figured it would be better to create a custom class called DateButton which would clean up my code a bit. So whenever I need a similar button I can create a declare a DateButton in my XML. Anyways this is my first time creating a custom view and I need some help whenever I try to add my custom button to my layout I get an error: 

error! ClassNotFoundException: android.app.DatePickerDialog$OnDateSetListener

Here is what I want the button to look at (very simple)

enter image description here

and when it is clicked it will pop up the built in android datepicker dialog:

enter image description here

Here is my current code for this custom datebutton:

import android.app.DatePickerDialog;
import android.app.DatePickerDialog.OnDateSetListener;
import android.content.Context;
import android.util.AttributeSet;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.DatePicker;


public class DateButton extends Button implements OnClickListener, OnDateSetListener {

     private static final int DATE_DIALOG_ID = 0;
private int mYear;
private int mMonth;
private int mDay;
private OnDateSetListener mDateSetListener;

public DateButton(Context context) {
    super(context);
}

public DateButton(Context arg0, AttributeSet arg1) {
    super(arg0, arg1);
}

public DateButton(Context arg0, AttributeSet arg1, int arg2) {
    super(arg0, arg1, arg2);
}

@Override
public void onClick(View v) {
    showDialog(DATE_DIALOG_ID);
}

private DatePickerDialog showDialog(int dateDialogId) {
    return new DatePickerDialog(getContext(),
            mDateSetListener,
            mYear, mMonth, mDay);
}

public void onDateSet(DatePicker view, int year, 
        int monthOfYear, int dayOfMonth) {
    mYear = year;
    mMonth = monthOfYear;
    mDay = dayOfMonth;
    updateDisplay();
}

private void updateDisplay() {
    this.setText(
            new StringBuilder()
            // Month is 0 based so add 1
            .append(pad(mMonth + 1)).append("/")
            .append(pad(mDay)).append("/")
            .append(mYear).append(" "));
}

//if single digit append "0" to the number
private static String pad(int c) {
    if (c >= 10)
        return String.valueOf(c);
    else
        return "0" + String.valueOf(c);
   }
    }

EDIT: I'm still running into trouble anyone have any examples of something similar to this? Thanks for any help!

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2 Answers

up vote 0 down vote

Try to change showDialog method to: 

private showDialog() {
        DatePickerDialog dialog = new DatePickerDialog(getContext(),
            this, mYear, mMonth, mDay);
        dialog.show();
    }
}

Also add initialize code for mYear, mMonth, mDay.

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what would I call in the onClick? – IZI_Shadow_IZI Jul 11 '11 at 15:44
@IZI_Shadow_IZI sorry for previous code, I have confused with Activity. Check new one. – jamapag Jul 11 '11 at 15:52
same error message with the showDialog method. still getting classNotFound – IZI_Shadow_IZI Jul 11 '11 at 16:02
up vote 0 down vote

Another solution for date picker in android is, use your own date picker. default date picker provide date range from 1900 to 2100. By using custom date picker you can define your own range of year field. On some devices you can't even input before year 1980.

So here is my solution. use this tutorial--->http://hukum-android-lab.blogspot.in/2013/06/custom-date-picker-in-android.html

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