Backup Database - Android Database

Android examples for Database:Database Backup

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Description

Backup Database

Demo Code


//package com.java2s;
import android.os.Environment;
import android.util.Log;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.channels.FileChannel;

import java.util.ArrayList;
import java.text.SimpleDateFormat;
import java.util.Date;

public class Main {
    public static final String DBName = "time_log";
    public static final String PackageName = "net.asdf";
    static private SimpleDateFormat mDateTimeFormat = new SimpleDateFormat(
            "yyyyMMdd");

    public static String BackupDatabase() {
        String backupFileName = new String();
        try {//from   www. j av  a  2 s  .  c om
            File sd = Environment.getExternalStorageDirectory();
            File data = Environment.getDataDirectory();

            if (sd.canWrite()) {
                String currentDBPath = "\\data\\" + PackageName
                        + "\\databases\\" + DBName + "";
                backupFileName = getBackupFileName();
                String backupDBPath = "asdf\\" + backupFileName;

                File currentDB = new File(data, currentDBPath);
                File backupDB = new File(sd, backupDBPath);
                if (currentDB.exists()) {
                    FileChannel src = new FileInputStream(currentDB)
                            .getChannel();
                    FileChannel dst = new FileOutputStream(backupDB)
                            .getChannel();
                    dst.transferFrom(src, 0, src.size());
                    src.close();
                    dst.close();
                    return backupFileName;
                }
            }
        } catch (Exception e) {
            Log.i("backup", e.toString());
        }
        return backupFileName;
    }

    public static String getBackupFileName() {
        Date theDate = new Date();
        String fileName = mDateTimeFormat.format(theDate);
        String[] files = getBackupFileList();
        int index = 0;
        int fileIndex = 0;
        for (String name : files) {
            if (name.length() == 12) {
                if (name.substring(0, 8).equals(fileName)) {
                    fileIndex = Integer.parseInt(name.substring(9, 12));
                    if (fileIndex > index) {
                        index = fileIndex;
                    }
                }
            }
        }
        if (index + 1 <= 9) {
            return fileName + "-00" + (index + 1);
        }
        if (index + 1 <= 99) {
            return fileName + "-0" + (index + 1);
        }
        return fileName + "-" + (index + 1);
    }

    public static String[] getBackupFileList() {
        ArrayList<String> files = new ArrayList<String>();
        File sd = Environment.getExternalStorageDirectory();

        String backupPath = "asdf\\";
        File backupDBs = new File(sd, backupPath);
        for (File f : backupDBs.listFiles()) {
            files.add(f.getName());
        }
        String[] res = new String[files.size()];
        return (String[]) files.toArray(res);
    }
}

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