How to disable dates after selecting from the first DatePicker

Question

I have two Dialog Picker: Check In and Check Out. But I want that after clicking dates from the Check In, it will disable dates before that. So when I click March 6, 2019 on the Check In, on the Checkout, it should be March 7, 2019 and so on.

Check In and Check Out Image

DatePickerFragment.Java:

public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {


        Calendar c = Calendar.getInstance();
        int year = c.get(Calendar.YEAR);
        int month = c.get(Calendar.MONTH);
        int day = c.get(Calendar.DAY_OF_MONTH);

        DatePickerDialog dialog = new DatePickerDialog(getContext(), (DatePickerDialog.OnDateSetListener)getActivity(), year, month, day);

        dialog.getDatePicker().setMinDate(System.currentTimeMillis()-1000);


        return dialog;
    }

Details.Java

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_details);

     final DialogFragment datePicker = new DatePickerFragment();

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            datePicker.show(getSupportFragmentManager(),"Date Picker");
            startDateOrEndDate = true ;
        }
    });
    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            datePicker.show(getSupportFragmentManager(),"Date Picker");
            startDateOrEndDate = false ;
        }
    });
      }

public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
    Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR, year );
    c.set(Calendar.MONTH, month);
    c.set(Calendar.DAY_OF_MONTH, dayOfMonth);
    String date = DateFormat.getDateInstance(DateFormat.FULL).format(c.getTime());



    TextView textView = (TextView) findViewById(R.id.checkInTV);
    TextView textView2 = (TextView) findViewById(R.id.checkOutTV);




    if (startDateOrEndDate) {
        textView.setText(date);
    } else {
        textView2.setText(date);
    }
}

Answer 1

I believe that what you are looking for is reworking your date picker code such that setMinDate() can be set when created, so that you can pass in the min date. Right now you are setting the min date right here:

dialog.getDatePicker().setMinDate(System.currentTimeMillis() - 1000);

This works fine for the first date picker, as the min date given is today, but for the second date picker you want to pass in the first date as the min date.

I don't know what your other code looks like in terms of creating the date picker fragment, but assuming you are using fragments you can put the min date in the arguments bundle when creating the fragment. Here's an example of how you would pass in the min date when creating the Fragment:

// This would be the start date the user had previously chosen
long startDate = 0L

Bundle bundle = new Bundle(); 

// We only want to put in the min date if this is the second date
if (!startDateOrEndDate) {
    bundle.putLong("minDate", startDate); 
}

// Create the Fragment, set the bundle as its arguments
DatePickerFragment fragment = new DatePickerFragment(); 
fragment.setArguments(bundle);

Then, in the DatePickerFragment, you would set the min date accordingly:

public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {
    // Dialog Creation code here

    // Default the min date to today 
    long minDate = System.currentTimeMillis() - 1000;

    // Check if there are arguments
    Bundle args = getArguments(); 
    if (args != null) {
        // If there are args, grab the min date from it (default to today just in case)
        minDate = args.getLong("minDate", minDate); 
    }

    dialog.getDatePicker().setMinDate(minDate); 

    return dialog; 
}

There's a few things to take into account:

• You have to make sure that the user chooses the start date before the end date.
• You might want to set the end date as (startDate + 1 day) as opposed to just startDate, so you'll need to take that into account when passing the minDate.

Overall this should give you an idea of how to proceed.

Side note: I would recommend renaming your boolean to something clear, such as isStartDate. That way if it's true, you know it's the start date and vice versa. startDateOrEndDate doesn't tell us which one it is if it's true, it just tells us that it's either the start date or the end date.

Edit - March 11, 2019

Given your new code, this is how you could change it with what I have said above

Details.java

private long startDate = -1L; 

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_details);

    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            DialogFragment datePicker = new DatePickerFragment();
            datePicker.show(getSupportFragmentManager(),"Date Picker");
            startDateOrEndDate = true ;
        }
    });
    button1.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (startDate == -1L) {
                // Start date hasn't been chosen yet, tell user to do so
                Toast.makeText(Details.this, "Please choose start date", Toast.LENGTH_SHORT).show(); 
                return; 
            }

            // Add the start date to the bundle
            Bundle bundle = new Bundle(); 
            bundle.putLong("minDate", startDate); 

            // Create the Fragment, set the bundle as its arguments
            DatePickerFragment datePicker = new DatePickerFragment(); 
            datePicker.setArguments(bundle);
            datePicker.show(getSupportFragmentManager(),"Date Picker");
            startDateOrEndDate = false ;
        }
    });
}

public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
    Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR, year );
    c.set(Calendar.MONTH, month);
    c.set(Calendar.DAY_OF_MONTH, dayOfMonth);
    String date = DateFormat.getDateInstance(DateFormat.FULL).format(c.getTime());

    TextView textView = (TextView) findViewById(R.id.checkInTV);
    TextView textView2 = (TextView) findViewById(R.id.checkOutTV);

    if (startDateOrEndDate) {
        // If this is the start date, save it to the instance variable above
        startDate = c.getTimeinMillis(); 
        textView.setText(date);
    } else {
        textView2.setText(date);
    }
}

And in the onCreateDialog() of the DatePickerFragment use the code in my original answer above.

Let me know if this makes sense!

Answer 2

You can copy paste the following code somewhere and then add your code.

The MainActivity

public class MainActivity extends AppCompatActivity implements
    DatePickerDialog.OnDateSetListener{
final long[]l = new long[1];
boolean startDateOrEndDate;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Button en = findViewById(R.id.entry);
    Button ex = findViewById(R.id.exit);


    final myDatepickerFragment datePicker = new myDatepickerFragment();

    en.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            l[0]= System.currentTimeMillis();
            datePicker.show(getSupportFragmentManager(),l[0]+"");

            startDateOrEndDate = true ;
        }
    });
    ex.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            datePicker.show(getSupportFragmentManager(),l[0]+"");
            startDateOrEndDate = false ;
        }
    });

}
@Override
public void onDateSet(DatePicker view, int year, int month, int dayOfMonth) {
    Calendar c = Calendar.getInstance();
    c.set(Calendar.YEAR, year);
    c.set(Calendar.MONTH, month);
    c.set(Calendar.DAY_OF_MONTH, dayOfMonth);
    l[0]= c.getTimeInMillis()+24*60*60*1000;
    String date = DateFormat.getDateInstance(DateFormat.FULL).format(c.getTime());
    System.out.println(date);

TextView textView = (TextView) findViewById(R.id.checkInTV);
TextView textView2 = (TextView) findViewById(R.id.checkOutTV);


if (startDateOrEndDate) {
    textView.setText(date);
} else {
    textView2.setText(date);
}
}
}

The Fragment class

public class myDatepickerFragment extends DialogFragment {
private String tag;

@Override
public void show(FragmentManager manager, String tag) {
    super.show(manager, tag);
    this.tag = tag;
}

@NonNull
@Override
public Dialog onCreateDialog(@Nullable Bundle savedInstanceState) {


    Calendar c = Calendar.getInstance();
    int year = c.get(Calendar.YEAR);
    int month = c.get(Calendar.MONTH);
    int day = c.get(Calendar.DAY_OF_MONTH);
    long l = Long.parseLong(tag);
    DatePickerDialog dialog = new DatePickerDialog(getContext(), (DatePickerDialog.OnDateSetListener)getActivity(), year, month, day);

    dialog.getDatePicker().setMinDate(l-1000);
    dialog.getDatePicker().setBackgroundColor(Color.rgb(50,100,100));


    return dialog;
} }

I started experimenting with "tag" attribute earlier; may not be in proper copybook style, but it serves my purpose.

By the way it seems that you implemented the listener in (main) activity but I did not see "@override" there. Would you please explain this.