我想我现有的数据库从我的内部到外部存储复制，但我有一个小问题。它说，的文件不存在。下面是我使用的究竟是什么：

从内部文件复制到外部存储：

 私人无效的CopyFile（SRC字符串，字符串DST）抛出IOException异常{
    FileChannel随路=新的FileInputStream（SRC）.getChannel（）;
    FileChannel outChannel =新的FileOutputStream（DST）.getChannel（）;
    尝试
    {
        inChannel.transferTo（0，inChannel.size（），outChannel）;
    }
    最后
    {
        如果（随路！= NULL）
            inChannel.close（）;
        如果（outChannel！= NULL）
            outChannel.close（）;
    }
}
 

和我使用的是这样的：

，但它不工作，我pretty的肯定，在内部存储的数据库是存在的。

如果我设定为的CopyFile 目标文件夹/ SD卡/。例/数据/它的建立文件数据在。例。

我缺少的是什么有什么建议？

使用这个数据库复制到SD卡。

 公共无效的CopyFile（）
    {
        尝试
        {
            文件SD = Environment.getExternalStorageDirectory（）;
            文件数据= Environment.getDataDirectory（）;

            如果（sd.canWrite（））
            {
                字符串currentDBPath =\\ \\数据\\ your.package.name数据库\\ dabase_name;
                字符串backupDBPath =数据库名称;
                文件currentDB =新的文件（数据，currentDBPath）;
                文件的某个backupdb =新的文件（SD，backupDBPath）;

                如果（currentDB.exists（））{
                    FileChannel SRC =新的FileInputStream（currentDB）.getChannel（）;
                    FileChannel DST =新的FileOutputStream（某个backupdb）.getChannel（）;
                    dst.transferFrom（源，0，src.size（））;
                    src.close（）;
                    dst.close（）;
                }
                如果（布尔==真）
                {
                    Toast.makeText（Settings.this，备份完成，Toast.LENGTH_SHORT）.show（）;
                    布尔=假;
                }
            }
        }
        赶上（例外五）{
            Log.w（设置备份，E）;
        }
    }
 

I'm trying to copy my existing databases from my Internal to External Storage,but I have a little problem. It says that the file does not exist. Here is what I'm using actually :

to copy files from internal to external storage :

    private void copyFile(String src, String dst) throws IOException{
    FileChannel inChannel = new FileInputStream(src).getChannel();
    FileChannel outChannel = new FileOutputStream(dst).getChannel();
    try
    {
        inChannel.transferTo(0, inChannel.size(), outChannel);
    }
    finally
    {
        if (inChannel != null)
            inChannel.close();
        if (outChannel != null)
            outChannel.close();
    }
}

and I'm using it like this :

copyFile("/data/data/com.example.test/databases/database.sqlite","/sdcard/.Example/Data/database.sqlite");

but it's not working and I'm pretty sure that the database in internal storage is there.

If I set as a destination folder in copyFile "/sdcard/.Example/Data/" it's creating file Data in .Example.

Any suggestions what I'm missing?

Use this to copy your database to sdcard.

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

            if (sd.canWrite()) 
            {
                String currentDBPath = "\\data\\your.package.name\\databases\\dabase_name";
                String backupDBPath = "database_name";
                File currentDB = new File(data, currentDBPath);
                File backupDB = new File(sd, backupDBPath);

                if (currentDB.exists()) {
                    FileChannel src = new FileInputStream(currentDB).getChannel();
                    FileChannel dst = new FileOutputStream(backupDB).getChannel();
                    dst.transferFrom(src, 0, src.size());
                    src.close();
                    dst.close();
                }
                if(bool == true)
                {
                    Toast.makeText(Settings.this, "Backup Complete", Toast.LENGTH_SHORT).show();
                    bool = false;
                }
            }               
        } 
        catch (Exception e) {
            Log.w("Settings Backup", e);
        }
    }