将目录从 Assets 复制到本地目录

我正在尝试使用资产文件夹中的目录并将其作为File。是否可以访问 Assets 目录中的某些内容File？如果没有，如何将 Assets 文件夹中的目录复制到应用程序的本地目录？

我会像这样复制一个文件：

    try
    {
        InputStream stream = this.getAssets().open("myFile");
        OutputStream output = new BufferedOutputStream(new FileOutputStream(this.getFilesDir() + "/myNewFile"));

        byte data[] = new byte[1024];
        int count;

        while((count = stream.read(data)) != -1)
        {
            output.write(data, 0, count);
        }

        output.flush();
        output.close();
        stream.close();
    }
    catch(IOException e)
    {
        e.printStackTrace();
    }

但是，我不确定如何对目录执行此操作。

我宁愿不围绕不起作用的东西构建我的基础设施，那么我如何将目录从资产复制到本地目录，或者是否可以将我的资产中的目录作为File?

EDIT

正如 dmaxi 在上面的评论中所建议的，您可以使用他的链接，并使用以下代码：

    void displayFiles (AssetManager mgr, String path) {
        try {
            String list[] = mgr.list(path);
            if (list != null)
                for (int i=0; i<list.length; ++i)
                {
                    Log.v("Assets:", path +"/"+ list[i]);
                    displayFiles(mgr, path + "/" + list[i]);
                }
        } catch (IOException e) {
             Log.v("List error:", "can't list" + path);
        }
     }

我接受了这个链接 https://stackoverflow.com/questions/1495585/how-can-i-get-a-directory-listing-of-resources-from-my-android-app?lq=1。 也许您可以将此代码与前一个代码结合起来。

EDIT:也可以看看资产管理器 http://developer.android.com/reference/android/content/res/AssetManager.html.

private void copyFolder(String name) {
            // "Name" is the name of your folder!
    AssetManager assetManager = getAssets();
    String[] files = null;

    String state = Environment.getExternalStorageState();

    if (Environment.MEDIA_MOUNTED.equals(state)) {
        // We can read and write the media
        // Checking file on assets subfolder
        try {
            files = assetManager.list(name);
        } catch (IOException e) {
            Log.e("ERROR", "Failed to get asset file list.", e);
        }
        // Analyzing all file on assets subfolder
        for(String filename : files) {
            InputStream in = null;
            OutputStream out = null;
            // First: checking if there is already a target folder
            File folder = new File(Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name);
            boolean success = true;
            if (!folder.exists()) {
                success = folder.mkdir();
            }
            if (success) {
                // Moving all the files on external SD
                try {
                    in = assetManager.open(name + "/" +filename);
                    out = new FileOutputStream(Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name + "/" + filename);
                    Log.i("WEBVIEW", Environment.getExternalStorageDirectory() + "/yourTargetFolder/" + name + "/" + filename);
                    copyFile(in, out);
                    in.close();
                    in = null;
                    out.flush();
                    out.close();
                    out = null;
                } catch(IOException e) {
                    Log.e("ERROR", "Failed to copy asset file: " + filename, e);
                } finally {
                    // Edit 3 (after MMs comment)
                    in.close();
                    in = null;
                    out.flush();
                    out.close();
                    out = null;
                }
            }
            else {
                // Do something else on failure
            }       
        }
    } else if (Environment.MEDIA_MOUNTED_READ_ONLY.equals(state)) {
        // We can only read the media
    } else {
        // Something else is wrong. It may be one of many other states, but all we need
        // is to know is we can neither read nor write
    }
}

// Method used by copyAssets() on purpose to copy a file.
private void copyFile(InputStream in, OutputStream out) throws IOException {
    byte[] buffer = new byte[1024];
    int read;
    while((read = in.read(buffer)) != -1) {
        out.write(buffer, 0, read);
    }
}

EDIT 2:我在上面添加了一个示例：这段代码仅将资产中的特定文件夹复制到 SD 卡。让我知道它是否有效！