Communication between fragments/dialogs in android

Question

I have an activity with two fragments: one for showing products in a grid view, and the other to show the products that the user adds to the order (ListFragment). When the u

Answer 1

The recommended approach is to communicate from the DialogFragment to the Activity using an Interface, and then from the Activity to the Fragment.

In your activity:

public class Main extends FragmentActivity implements OnQuantitySelectedListener {

    public interface OnQuantitySelectedListener {
        void onFinishEditDialog(String inputText);
    }


    @Override
    public void onFinishEditDialog(String inputText) {
        Toast.makeText(this, "Quantity: " + inputText, Toast.LENGTH_SHORT).show();
    }
}

Then the DialogFragment inner class

public static class ProductDialog extends DialogFragment {

    static ProductDialog newInstance(ProductVO product) {
        ProductDialog f = new ProductDialog();

        Bundle args = new Bundle();
        args.putSerializable("product", product);
        f.setArguments(args);

        return f;
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        ProductVO product = (ProductVO) getArguments().getSerializable("product");

        LayoutInflater factory = LayoutInflater.from(getActivity());
        final View textEntryView = factory.inflate(R.layout.alert_dialog_text_entry, null);
        mEditText = (EditText) textEntryView.findViewById(R.id.txt_your_name);

        return new AlertDialog.Builder(getActivity())
                .setIcon(R.drawable.ic_dialog_add)
                .setTitle(R.string.add_product)
                .setView(textEntryView)
                .setPositiveButton(R.string.accept,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                             OnQuantitySelectedListener listener = (OnQuantitySelectedListener) getActivity();
                             listener.onFinishEditDialog(mEditText.getText().toString());
                        }
                    }
                )
                .setNegativeButton(R.string.cancel,
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int whichButton) {
                        }
                    }
                )
                .create();
    }
}

The XML for R.layout.alert_dialog_text_entry is from the API Demos. It doesn't fit your use case of getting a quantity from the user, but it illustrates using a custom layout to get a value from the user.