Android数据库备份类，android数据库备份,/** * Androi

Android数据库备份类，android数据库备份,/** * Androi

/** * Android数据库备份类 */public class BackupTask extends AsyncTask<String, Void, Integer> implements        CompletionListener {    // 定义常量    public static final int BACKUP_SUCCESS = 1;    public static final int RESTORE_SUCCESS = 2;    public static final int BACKUP_ERROR = 3;    public static final int RESTORE_NOFLEERROR = 4;    public static final String COMMAND_BACKUP = "backupDatabase";    public static final String COMMAND_RESTORE = "restroeDatabase";    private Context mContext;    public BackupTask(Context context) {        this.mContext = context;    }    @Override    protected Integer doInBackground(String... params) {        // 1,获得数据库路径        File dbFile = mContext.getDatabasePath("xxx.db");        // 2,创建保存的数据库的路径        File exportDir = new File(Environment.getExternalStorageDirectory(),                "shopBackup");        if (!exportDir.exists()) {            exportDir.mkdirs();        }        File backup = new File(exportDir, dbFile.getName());        // 3,检查操作        String command = params[0];        if (command.equals(COMMAND_BACKUP)) {            // 复制文件            try {                backup.createNewFile();                fileCopy(dbFile, backup);                return BACKUP_SUCCESS;            } catch (IOException e) {                // TODO Auto-generated catch block                e.printStackTrace();                return BACKUP_ERROR;            }        } else {            return BACKUP_ERROR;        }    }    private void fileCopy(File source, File dest) throws IOException {        FileChannel inChannel = new FileInputStream(source).getChannel();        FileChannel outChannel = new FileOutputStream(dest).getChannel();        // FileInputStream fis = new FileInputStream(dbFile);        // FileOutputStream fos = new FileOutputStream(backup);        // byte buffer[] = new byte[4 * 1024];        // while(fis.read(buffer) != -1){        // fos.write(buffer);        // }        // fos.flush();        //        long size = inChannel.size();        try {            inChannel.transferTo(0, inChannel.size(), outChannel);        } catch (IOException e) {            // TODO Auto-generated catch block            e.printStackTrace();        } finally {            if (inChannel != null) {                inChannel.close();            }            if (outChannel != null) {                outChannel.close();            }        }    }    @Override    protected void onPostExecute(Integer result) {        // TODO Auto-generated method stub        super.onPostExecute(result);        switch (result) {        case BACKUP_SUCCESS:            onBackupComplete();            break;        default:            break;        }    }    @Override    public void onBackupComplete() {        Log.d("backup", "ok");    }    @Override    public void onRestoreComplete() {        // TODO Auto-generated method stub    }    @Override    public void onError(int errorCode) {        // TODO Auto-generated method stub    }}