Android 导出资产文件夹中的sqlite数据库

我的资产文件夹中有一个sqlite数据库。我想导出那个文件。所以我这样做：

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
            .permitAll().build();
    StrictMode.setThreadPolicy(policy);
    //
    File direct = new File(Environment.getExternalStorageDirectory()
            + "/Exam Creator");

    if (!direct.exists())
    {
        if (direct.mkdir())
        {
            // directory is created;
        }

    }
    exportDB();
    // importDB();

}

private void exportDB()
{
    // TODO Auto-generated method stub

    try
    {
        File sd = Environment.getExternalStorageDirectory();
        File data = Environment.getDataDirectory();

        if (sd.canWrite())
        {
            dbopenhelper.copyDataBase();
            String currentDBPath = dbopenhelper.DB_PATH
                    + dbopenhelper.DATABASE_NAME;
            String backupDBPath = "/BackupFolder/Prayers.db";
            File currentDB = new File(data, currentDBPath);
            File backupDB = new File(sd, backupDBPath);

            FileChannel src = new FileInputStream(currentDB).getChannel();
            FileChannel dst = new FileOutputStream(backupDB).getChannel();
            dst.transferFrom(src, 0, src.size());
            src.close();
            dst.close();
            Toast.makeText(getBaseContext(),
                    backupDB.toString() + "SUCCESS", Toast.LENGTH_LONG)
                    .show();

        }
    } catch (Exception e)
    {

        Toast.makeText(getBaseContext(), e.toString(), Toast.LENGTH_LONG)
                .show();

    }
}

为了获得currentDB的路径，我首先在我的DBOpenHelper中使用这个方法复制项目中的数据库，并在export方法中调用它，如您所见

public static void copyDataBase()
{
    try
    {

        InputStream input = context.getAssets().open(DATABASE_NAME);
        FileOutputStream output = new FileOutputStream(DB_PATH
                + DATABASE_NAME);
        byte[] data = new byte[1024];
        int buffer;
        while ((buffer = input.read(data)) != -1)
        {
            output.write(data, 0, buffer);
        }
        output.flush();
        output.close();
        input.close();
    } catch (IOException ex)
    {
        Log.e(LOGTAG, "Error in copying database...");
    }
}

但当我运行它时，我得到了FileNotFoundException。我对它进行了调试，发现在这一行之后：

FileChannel src = new FileInputStream(currentDB).getChannel();

它去接布洛克。有人知道怎么回事吗

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提前感谢

您是否设置了在清单中写入外部存储的权限？请记录并检查您复制数据库的路径frmo和应保存数据库的目录文件路径。输出是什么？请在此处复制并粘贴…@JustinMorrisThanks@Opiatefuchs谢谢，问题解决了：）