Question

image file内有一个directory。如何copy将此image file转换为刚刚创建的另一个directory？这两个directories位于设备的internal storage上：）

Answer 1

您可以使用这些功能。如果传入文件，第一个将复制包含所有子项的整个目录或单个文件。第二个只对文件有用，并且在第一个文件中为每个文件调用。

另请注意，您需要具有执行此操作的权限

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

功能：

 public static void copyFileOrDirectory(String srcDir, String dstDir) {

        try {
            File src = new File(srcDir);
            File dst = new File(dstDir, src.getName());

            if (src.isDirectory()) {

                String files[] = src.list();
                int filesLength = files.length;
                for (int i = 0; i < filesLength; i++) {
                    String src1 = (new File(src, files[i]).getPath());
                    String dst1 = dst.getPath();
                    copyFileOrDirectory(src1, dst1);

                }
            } else {
                copyFile(src, dst);
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void copyFile(File sourceFile, File destFile) throws IOException {
        if (!destFile.getParentFile().exists())
            destFile.getParentFile().mkdirs();

        if (!destFile.exists()) {
            destFile.createNewFile();
        }

        FileChannel source = null;
        FileChannel destination = null;

        try {
            source = new FileInputStream(sourceFile).getChannel();
            destination = new FileOutputStream(destFile).getChannel();
            destination.transferFrom(source, 0, source.size());
        } finally {
            if (source != null) {
                source.close();
            }
            if (destination != null) {
                destination.close();
            }
        }
    }

Answer 2

如果要以编程方式复制图像，请使用以下代码。

     File sourceLocation= new File (sourcepath);
     File targetLocation= new File (targetpath);

     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();

Answer 3

**使用FileUtils这是一种简单快捷的最佳方法，并从此处下载Jar文件**

public void MoveFiles（String sourcepath）{

Exception in Tkinter callback
Traceback (most recent call last):
  File 
"C:\Users\samue\AppData\Local\Programs\Thonny\lib\tkinter\__init__.py", 
line 1705, in __call__
    return self.func(*args)
  File "C:\Users\samue\OneDrive - The Becket 
School\Airport_Tkinters_GUI_29.12.18.py", line 485, in cost
    date_price_increase()
  File "C:\Users\samue\OneDrive - The Becket 
School\Airport_Tkinters_GUI_29.12.18.py", line 325, in date_price_increase
   tickets_per_person = tickets_per_person * 1.15
UnboundLocalError: local variable 'tickets_per_person' referenced before 
   assignment

Go To Link For FileUtils Jar

如何以编程方式将文件复制到另一个目录？

3 个答案: