android 数据库备份还原

详情参考某android平板项目开发笔记---计划任务备份

新建一个类继承 AsyncTask

public class BackupTask extends AsyncTask<String, Void, Integer> {    private 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) {        // TODO Auto-generated method stub
        // 获得正在使用的数据库路径，我的是 sdcard 目录下的 /dlion/db_dlion.db
　　　　 // 默认路径是 /data/data/(包名)/databases/*.db        File dbFile = mContext.getDatabasePath(Environment                .getExternalStorageDirectory().getAbsolutePath()                + "/dlion/db_dlion.db");        File exportDir = new File(Environment.getExternalStorageDirectory(),                "dlionBackup");        if (!exportDir.exists()) {            exportDir.mkdirs();        }        File backup = new File(exportDir, dbFile.getName());        String command = params[0];        if (command.equals(COMMAND_BACKUP)) {            try {                backup.createNewFile();                fileCopy(dbFile, backup);                return Log.d("backup", "ok");            } catch (Exception e) {                // TODO: handle exception                e.printStackTrace();                return Log.d("backup", "fail");            }        } else if (command.equals(COMMAND_RESTORE)) {            try {                fileCopy(backup, dbFile);                return Log.d("restore", "success");            } catch (Exception e) {                // TODO: handle exception                e.printStackTrace();                return Log.d("restore", "fail");            }        } else {            return null;        }    }    private void fileCopy(File dbFile, File backup) throws IOException {        // TODO Auto-generated method stub        FileChannel inChannel = new FileInputStream(dbFile).getChannel();        FileChannel outChannel = new FileOutputStream(backup).getChannel();        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();            }        }    }}

在 mainActivity 里异步加载备份、还原：

　　// 数据恢复    private void dataRecover() {        // TODO Auto-generated method stub        new BackupTask(this).execute("restroeDatabase");    }    // 数据备份    private void dataBackup() {        // TODO Auto-generated method stub        new BackupTask(this).execute("backupDatabase");    }

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