Question

I crated a datetime component but it’s constructed automatically (I have it in a XML layout and I don’t want to create it manually) but I need to pass a reference to an Activity in order to create dialogs. How can I achieve that? I tried a setter after findViewById but it’s not a good solution…

public class DateTimeComponent extends RelativeLayout {

    private Activity activity;

    public DateComponent(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);
        // rest ommited
        initFields();
    }

    private void initFields() {
        dateEditText = (EditText) findViewById(R.id.dateEditText);
        dateEditText.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                activity.showDialog(DATE_PICKER_DIALOG);
            }
        });

        timeEditText = (EditText) findViewById(R.id.timeEditText);
        timeEditText.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                activity.showDialog(TIME_PICKER_DIALOG);
            }
        });
    }

    // rest ommited

    public Dialog getDatePickerDialog() {
        int year = selectedDateTime.get(YEAR);
        int month = selectedDateTime.get(MONTH);
        int day = selectedDateTime.get(DAY_OF_MONTH);
        return new DatePickerDialog(activity, onDateSetListener, year, month, day);
    }

    public Dialog getTimePickerDialog() {
        int hour = selectedDateTime.get(HOUR_OF_DAY);
        int minute = selectedDateTime.get(MINUTE);
        return new TimePickerDialog(activity, onTimeSetListener, hour, minute, true);
    }

    private final OnDateSetListener onDateSetListener = new OnDateSetListener() {
        @Override
        public void onDateSet(DatePicker view, int year, int monthOfYear, int dayOfMonth) {
            // do something
        }
    };

    private final OnTimeSetListener onTimeSetListener = new OnTimeSetListener() {
        @Override
        public void onTimeSet(TimePicker view, int hourOfDay, int minute) {
            // do something
        }
    };

}

Answer 1

Perhaps this may help you:

Option 1:

public class DateTimeComponent extends RelativeLayout {
    private Activity activity;

    public DateTimeComponent(Activity act){
        activity = act;
    }

    public void someListener() {
        activity.showDialog(...);
    }

}

Option 2:

public class DateTimeComponent extends RelativeLayout {

    public void someListener(Activity act) {
        act.showDialog(...);
    }

}

Option 3:

...
    private Activity activity;

    public DateComponent(Context context, AttributeSet attributeSet) {
        super(context, attributeSet);

        activity = (Activity) getContext();

        // rest ommited
        initFields();
    }

...