android 添加到桌面 产生数据,如何将我的android上的数据库拉到桌面上？

dhaag23..

10

除非您的手机已植根,否则无法访问内部存储空间.一种简单的方法是使用模拟器,然后您可以获取文件.为了从设备上获取数据库,我编写了一个小实用程序并为其添加了一些调试UI:

private void backupDb() throws IOException {

File sd = Environment.getExternalStorageDirectory();

File data = Environment.getDataDirectory();

if (sd.canWrite()) {

String currentDBPath = "/data/com.yourcompany.yourapp/databases/yourapp.db";

String backupDBPath = "/yourapp_logs/yourapp.db";

File currentDB = new File(data, currentDBPath);

File backupDB = new File(sd, backupDBPath);

if (backupDB.exists())

backupDB.delete();

if (currentDB.exists()) {

makeLogsFolder();

copy(currentDB, backupDB);

}

dbFilePath = backupDB.getAbsolutePath();

}

}

private void makeLogsFolder() {

try {

File sdFolder = new File(Environment.getExternalStorageDirectory(), "/yourapp_logs/");

sdFolder.mkdirs();

}

catch (Exception e) {}

}

private void copy(File from, File to) throws FileNotFoundException, IOException {

FileChannel src = null;

FileChannel dst = null;

try {

src = new FileInputStream(from).getChannel();

dst = new FileOutputStream(to).getChannel();

dst.transferFrom(src, 0, src.size());

}

finally {

if (src != null)

src.close();

if (dst != null)

dst.close();

}

}

您的代码看起来很好,但我的Eclipse无法识别副本(currentDB,backupDB); 指令.您是否安装了一些额外的库(.jar)来使用复制方法？ (2认同)