我知道的最安全的代码:

private boolean recursiveRemove(File file) {
    if(file == null  || !file.exists()) {
        return false;
    }

    if(file.isDirectory()) {
        File[] list = file.listFiles();

        if(list != null) {

            for(File item : list) {
                recursiveRemove(item);
            }

        }
    }

    if(file.exists()) {
        file.delete();
    }

    return !file.exists();
}

检查文件是否存在，处理空值，检查目录是否被实际删除

我用这个递归函数来做这个工作:

public static void deleteDirAndContents(@NonNull File mFile){
    if (mFile.isDirectory() && mFile.listFiles() != null && mFile.listFiles().length > 0x0) {
        for (File file : mFile.listFiles()) {
            deleteDirAndContents(file);
        }
    } else {
        mFile.delete();
    }
}

该函数检查它是目录还是文件。

如果是目录检查它是否有子文件，如果有子文件将再次调用自己传递子文件并重复。

如果它是一个文件，它删除它。

(不要使用这个函数通过传递缓存目录来清除应用程序缓存，因为它也会删除缓存目录，所以应用程序会崩溃… 如果你想清除缓存，你可以使用这个函数，它不会删除你传递给它的dir:

public static void deleteDirContents(@NonNull File mFile){
        if (mFile.isDirectory() && mFile.listFiles() != null && mFile.listFiles().length > 0x0) {
            for (File file : mFile.listFiles()) {
                deleteDirAndContents(file);
            }
        }
    }

或者你可以检查它是否是缓存目录使用:

if (!mFile.getAbsolutePath().equals(context.getCacheDir().getAbsolutePath())) {
    mFile.delete();
}

清除应用程序缓存的示例代码:

public static void clearAppCache(Context context){
        try {
            File cache = context.getCacheDir();
            FilesUtils.deleteDirContents(cache);
        } catch (Exception e){
            MyLogger.onException(TAG, e);
        }
    }

再见，有一个美好的一天&编码:D

这里是一个非递归的实现，只是为了好玩:

/**
 * Deletes the given folder and all its files / subfolders.
 * Is not implemented in a recursive way. The "Recursively" in the name stems from the filesystem command
 * @param root The folder to delete recursively
 */
public static void deleteRecursively(final File root) {
    LinkedList<File> deletionQueue = new LinkedList<>();
    deletionQueue.add(root);

    while(!deletionQueue.isEmpty()) {
        final File toDelete = deletionQueue.removeFirst();
        final File[] children = toDelete.listFiles();
        if(children == null || children.length == 0) {
            // This is either a file or an empty directory -> deletion possible
            toDelete.delete();
        } else {
            // Add the children before the folder because they have to be deleted first
            deletionQueue.addAll(Arrays.asList(children));
            // Add the folder again because we can't delete it yet.
            deletionQueue.addLast(toDelete);
        }
    }
}

你可以像这样递归地删除文件和文件夹:

void deleteRecursive(File fileOrDirectory) {
    if (fileOrDirectory.isDirectory())
        for (File child : fileOrDirectory.listFiles())
            deleteRecursive(child);

    fileOrDirectory.delete();
}

这种方法适用于只包含文件的文件夹，但如果您正在寻找还包含子文件夹的场景，则需要递归

此外，您应该捕获返回的返回值，以确保允许您删除该文件

,包括

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

在你的清单上

void DeleteRecursive(File dir)
{
    Log.d("DeleteRecursive", "DELETEPREVIOUS TOP" + dir.getPath());
    if (dir.isDirectory())
    {
        String[] children = dir.list();
        for (int i = 0; i < children.length; i++)
        {
            File temp = new File(dir, children[i]);
            if (temp.isDirectory())
            {
                Log.d("DeleteRecursive", "Recursive Call" + temp.getPath());
                DeleteRecursive(temp);
            }
            else
            {
                Log.d("DeleteRecursive", "Delete File" + temp.getPath());
                boolean b = temp.delete();
                if (b == false)
                {
                    Log.d("DeleteRecursive", "DELETE FAIL");
                }
            }
        }

    }
    dir.delete();
}

//To delete all the files of a specific folder & subfolder
public static void deleteFiles(File directory, Context c) {
    try {
        for (File file : directory.listFiles()) {
            if (file.isFile()) {
                final ContentResolver contentResolver = c.getContentResolver();
                String canonicalPath;
                try {
                    canonicalPath = file.getCanonicalPath();
                } catch (IOException e) {
                    canonicalPath = file.getAbsolutePath();
                }
                final Uri uri = MediaStore.Files.getContentUri("external");
                final int result = contentResolver.delete(uri,
                        MediaStore.Files.FileColumns.DATA + "=?", new String[]{canonicalPath});
                if (result == 0) {
                    final String absolutePath = file.getAbsolutePath();
                    if (!absolutePath.equals(canonicalPath)) {
                        contentResolver.delete(uri,
                                MediaStore.Files.FileColumns.DATA + "=?", new String[]{absolutePath});
                    }
                }
                if (file.exists()) {
                    file.delete();
                    if (file.exists()) {
                        try {
                            file.getCanonicalFile().delete();
                        } catch (IOException e) {
                            e.printStackTrace();
                        }
                        if (file.exists()) {
                            c.deleteFile(file.getName());
                        }
                    }
                }
            } else
                deleteFiles(file, c);
        }
    } catch (Exception e) {
    }
}

这是你的解决方案，它也将刷新画廊以及。