ConfirmDialogFragment.java

package org.ovirt.mobile.movirt.ui.dialogs;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;
import android.text.TextUtils;

import org.ovirt.mobile.movirt.R;

/**
 * Dialog asking to confirm destructive action
 * Use newInstance static method to create instance of this dialog
 * Created by Nika on 20.08.2015.
 */
public class ConfirmDialogFragment extends DialogFragment {

    ConfirmDialogListener listenerActivity;

    /**
     * @see ConfirmDialogFragment#newInstance(int, String, String)
     */
    public static ConfirmDialogFragment newInstance(int actionId, String actionString) {
        return newInstance(actionId, actionString, null);
    }

    /**
     * Creates instance of ConfirmDialogFragment.
     *
     * @param actionId     - Used to determine which action to perform in listener callback function.
     *                     Can be ignored with 0 if there is only one action in listener.
     * @param actionString - Human-readable string to show in dialog message.
     * @param infoString   - Human-readable string header to show in dialog message.
     * @return - instance of ConfirmDialogFragment.
     * Call .show() on returned value, to display this dialog.
     */
    public static ConfirmDialogFragment newInstance(int actionId, String actionString, String infoString) {
        ConfirmDialogFragment fragment = new ConfirmDialogFragment();
        Bundle args = new Bundle();
        args.putInt("actionId", actionId);
        args.putString("actionString", actionString);
        args.putString("infoString", infoString);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);
        try {
            listenerActivity = (ConfirmDialogListener) activity;
        } catch (ClassCastException e) {
            throw new ClassCastException(activity.toString()
                    + " must implement ConfirmDialogListener");
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final int actionId = getArguments().getInt("actionId");
        String actionString = getArguments().getString("actionString");
        String infoString = getArguments().getString("infoString");

        AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
        builder.setTitle(android.R.string.dialog_alert_title)
                .setMessage((TextUtils.isEmpty(infoString) ? "" : infoString + "\n\n")
                        + getString(R.string.dialog_confirm_message, actionString))
                .setPositiveButton(android.R.string.yes, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        listenerActivity.onDialogResult(DialogInterface.BUTTON_POSITIVE, actionId);
                    }
                })
                .setNegativeButton(android.R.string.no, new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        listenerActivity.onDialogResult(DialogInterface.BUTTON_NEGATIVE, actionId);
                    }
                });
        return builder.create();
    }

    /**
     * Implement this interface in activity that shows ConfirmDialogFragment.
     * switch through actionId to determine action if you have more then one action in activity.
     */
    public interface ConfirmDialogListener {

        void onDialogResult(int dialogButton, int actionId);
    }
}