Question

我正在使用Android。我的要求是我有一个目录和一些文件，后来我将一些其他文件下载到另一个目录中，我的目的是将最新目录中的所有文件复制到第一个目录中。在将文件从最新文件复制到第一个目录之前，我需要从第一个目录中删除所有文件。

Answer 1

    void copyFile(File src, File 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();
       }
    }

我不记得我在哪里发现了这个，但它来自我用来备份SQLite数据库的有用文章。

Answer 2

Apache FileUtils非常简单而且很好......

包括Apache commons io package add commons-io.jar

或

commons-io android gradle dependancy

 compile 'commons-io:commons-io:2.4'

添加此代码

String sourcePath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/TongueTwister/sourceFile.3gp";
        File source = new File(sourcePath);

        String destinationPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/TongueTwister/destFile.3gp";
        File destination = new File(destinationPath);
        try 
        {
            FileUtils.copyFile(source, destination);
        } 
        catch (IOException e) 
        {
            e.printStackTrace();
        }

Answer 3

您还必须使用以下代码：

public static void copyDirectoryOneLocationToAnotherLocation(File sourceLocation, File targetLocation)
        throws IOException {

    if (sourceLocation.isDirectory()) {
        if (!targetLocation.exists()) {
            targetLocation.mkdir();
        }

        String[] children = sourceLocation.list();
        for (int i = 0; i < sourceLocation.listFiles().length; i++) {

            copyDirectoryOneLocationToAnotherLocation(new File(sourceLocation, children[i]),
                    new File(targetLocation, children[i]));
        }
    } else {

        InputStream in = new FileInputStream(sourceLocation);

        OutputStream out = new FileOutputStream(targetLocation);

        // Copy the bits from instream to outstream
        byte[] buf = new byte[1024];
        int len;
        while ((len = in.read(buf)) > 0) {
            out.write(buf, 0, len);
        }
        in.close();
        out.close();
    }

}

如何将我的文件从一个目录复制到另一个目录？

3 个答案: