How to set the text at particular id in dynamic generated Button

Question

I have the following code. In this i have dynamically generated buttons.when click the button it shows the timepicker. My problem is to set the time for clicked button but it set the text at the last button how to set the value at clicked button...

public void addButton(int value) {
    list.removeAllViews();

    for (i=0 ; i < value; i++) {
        button = new Button(this);
        button.setText("Add Time");
        button.setId(i);

        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                Calendar mCalendar = Calendar.getInstance();
                new TimePickerDialog(MedInfo.this, onTimeListener, mCalendar
                        .get(Calendar.HOUR_OF_DAY), mCalendar.get(Calendar.MINUTE), false)
                        .show();
                btn_cnt = v.getId();
                Toast.makeText(getApplicationContext(), ""+btn_cnt, Toast.LENGTH_SHORT).show();
            }
        });
        list.addView(button);
    }
}


TimePickerDialog.OnTimeSetListener onTimeListener = new OnTimeSetListener() {

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        String AM_PM;
        Calendar mCalendar = Calendar.getInstance();
        if (hourOfDay < 12) {
            AM_PM = "AM";

        } else {
            AM_PM = "PM";

        }

        long start_time = DateTimeUtils.getTimeInMillis(hourOfDay, minute, 0);
        Calendar calendar = Calendar.getInstance();

        long mseconds = DateTimeUtils.getFirstMillis(calendar.get(Calendar.DATE),
                calendar.get(Calendar.MONTH), calendar.get(Calendar.YEAR));
        time = start_time + mseconds;

        button.settext(time);
        mCalendar.set(Calendar.HOUR, hourOfDay);
        mCalendar.set(Calendar.MINUTE, minute);

    }
};

any help will be appreciable...

Edit :

error log:

10-29 15:07:32.478: E/AndroidRuntime(6401): FATAL EXCEPTION: main
10-29 15:07:32.478: E/AndroidRuntime(6401): java.lang.NullPointerException
10-29 15:07:32.478: E/AndroidRuntime(6401):     at com.example.medicationreminder.MedInfo$MyOnTimeSetListenter.onTimeSet(MedInfo.java:237)
10-29 15:07:32.478: E/AndroidRuntime(6401):     at android.app.TimePickerDialog.tryNotifyTimeSet(TimePickerDialog.java:130)
10-29 15:07:32.478: E/AndroidRuntime(6401):     at android.app.TimePickerDialog.onClick(TimePickerDialog.java:115)

Answer 1

Try like to update the text of particular Button

Button b=(Button)list.getChildAt(btn_cnt);
b.settext(time);

As you are storing the Button Id in btn_cnt, so can get the view with getChildAt(position)

Where list is your Layout where you adding the Button dynamically.

public void addButton(int value) {
    list.removeAllViews();

    for (i=0 ; i < value; i++) {
        button = new Button(this);
        button.setText("Add Time");
        button.setId(i);

        button.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                Calendar mCalendar = Calendar.getInstance();
                new TimePickerDialog(MedInfo.this, onTimeListener, mCalendar
                        .get(Calendar.HOUR_OF_DAY), mCalendar.get(Calendar.MINUTE), false)
                        .show();
                btn_cnt = v.getId();
                Toast.makeText(getApplicationContext(), ""+btn_cnt, Toast.LENGTH_SHORT).show();
            }
        });
        list.addView(button);
    }
}


TimePickerDialog.OnTimeSetListener onTimeListener = new OnTimeSetListener() {

    public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
        String AM_PM;
        Calendar mCalendar = Calendar.getInstance();
        if (hourOfDay < 12) {
            AM_PM = "AM";

        } else {
            AM_PM = "PM";

        }

        long start_time = DateTimeUtils.getTimeInMillis(hourOfDay, minute, 0);
        Calendar calendar = Calendar.getInstance();

        long mseconds = DateTimeUtils.getFirstMillis(calendar.get(Calendar.DATE),
                calendar.get(Calendar.MONTH), calendar.get(Calendar.YEAR));
        time = start_time + mseconds;

        Button b=(Button)list.getChildAt(btn_cnt);
        b.settext(time);

        mCalendar.set(Calendar.HOUR, hourOfDay);
        mCalendar.set(Calendar.MINUTE, minute);

    }
};

Edit:- You can use List instead of Array for retrieving all the time from Button.

List<String> listOfDate=new ArrayList<String>();
        for(int i=0;i<list.getChildCount();i++)
        {
            Button b=(Button)list.getChildAt(i);
            listOfDate.add(b.getText().toString());

        }

Hope this will help you.