org.jamienicol.episodes.SelectBackupDialog.java Source code

Introduction

Here is the source code for org.jamienicol.episodes.SelectBackupDialog.java

Source

/*
 * Copyright (C) 2014 Jamie Nicol <jamie@thenicols.net>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package org.jamienicol.episodes;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v4.app.DialogFragment;
import java.io.File;
import java.util.Arrays;
import java.util.Comparator;
import org.jamienicol.episodes.db.BackUpRestoreHelper;

public class SelectBackupDialog extends DialogFragment {
    public interface OnBackupSelectedListener {
        public void onBackupSelected(String backupFilename);
    }

    private OnBackupSelectedListener onBackupSelectedListener;

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        try {
            onBackupSelectedListener = (OnBackupSelectedListener) activity;
        } catch (ClassCastException e) {
            final String message = String.format("%s must implement OnBackupSelectedListener", activity.toString());
            throw new ClassCastException(message);
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        final AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());

        final File[] backups = getBackupFiles();

        if (backups != null && backups.length > 0) {
            return createDialogBackups(builder, backups);
        } else {
            return createDialogNoBackups(builder);
        }
    }

    private File[] getBackupFiles() {
        final File[] files = BackUpRestoreHelper.getBackupDir().listFiles();

        if (files != null) {
            Arrays.sort(files, new Comparator<File>() {
                public int compare(File lhs, File rhs) {
                    return Long.valueOf(rhs.lastModified()).compareTo(lhs.lastModified());
                }
            });
            return files;
        } else {
            return null;
        }
    }

    private Dialog createDialogBackups(AlertDialog.Builder builder, final File[] backups) {
        final String[] names = new String[backups.length];
        for (int i = 0; i < backups.length; i++) {
            names[i] = backups[i].getName();
        }

        builder.setTitle(R.string.restore_dialog_title).setItems(names, new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
                final String path = backups[which].getPath();
                onBackupSelectedListener.onBackupSelected(path);
            }
        });

        return builder.create();
    }

    private Dialog createDialogNoBackups(AlertDialog.Builder builder) {
        final String message = getActivity().getString(R.string.restore_dialog_no_backups_message,
                BackUpRestoreHelper.getBackupDir());

        builder.setTitle(R.string.restore_dialog_title).setMessage(message);

        return builder.create();
    }
}