ConfirmationDialog.java

package com.ichi2.anki.dialogs;

import android.content.res.Resources;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;

import com.afollestad.materialdialogs.MaterialDialog;
import com.ichi2.anki.R;

    /**
     * This is a reusable convenience class which makes it easy to show a confirmation dialog as a DialogFragment.
     * Create a new instance, call setArgs(...), setConfirm(), and setCancel() then show it via the fragment manager as usual.
     */
    public class ConfirmationDialog extends DialogFragment {
        // TODO: Replace these with lambdas
        private Runnable mConfirm = new Runnable() {
            @Override
            public void run() { // Do nothing by default
            }
        };
        private Runnable mCancel = new Runnable() {
            @Override
            public void run() { // Do nothing by default
            }
        };

        public void setArgs(String message) {
            setArgs("" , message);
        }

        public void setArgs(String title, String message) {
            Bundle args = new Bundle();
            args.putString("message", message);
            args.putString("title", title);
            setArguments(args);
        }

        public void setConfirm(Runnable confirm) {
            mConfirm = confirm;
        }

        public void setCancel(Runnable cancel) {
            mCancel = cancel;
        }

        @Override
        public MaterialDialog onCreateDialog(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            Resources res = getActivity().getResources();
            String title = getArguments().getString("title");
            return new MaterialDialog.Builder(getActivity())
                    .title(title.equals("") ? res.getString(R.string.app_name) : title)
                    .content(getArguments().getString("message"))
                    .positiveText(res.getString(R.string.dialog_ok))
                    .negativeText(res.getString(R.string.dialog_cancel))
                    .callback(new MaterialDialog.ButtonCallback() {
                        @Override
                        public void onPositive(MaterialDialog dialog) {
                            mConfirm.run();
                        }

                        @Override
                        public void onNegative(MaterialDialog dialog) {
                            mCancel.run();
                        }
                    })
                    .show();
        }
    }