android 数据库 备份还原
16lz
2021-01-23
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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