无法在Android /数据中创建文件夹

Question

我在Android/data文件夹中创建文件夹时遇到问题.我的代码需要创建文件夹,并从其中的asset文件夹中复制文件.这是我的代码:

private File getFileForShare(String filename) {
    try {
        String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
        File folder = new File(extStorageDirectory, "/Android/data/" + context.getPackageName());
        if (!folder.exists()) {
            folder.mkdir();
        }
        AssetManager am = context.getAssets();
        InputStream inputStream = am.open("audio/" + filename);

        File f = new File(folder.getAbsolutePath(), filename);
        OutputStream outputStream = new FileOutputStream(f);
        byte buffer[] = new byte[1024];
        int length = 0;

        while ((length = inputStream.read(buffer)) > 0) {
            outputStream.write(buffer, 0, length);
        }

        outputStream.close();
        inputStream.close();

        return f;
    } catch (IOException e) {
        e.printStackTrace();
    }
    return null;
}

我初始化OutputStream对象时获取FileNotFoundException.此外,如果我转到Android/data文件夹,则不会创建包含我的应用程序包名称的新文件夹.在清单中我设置了读写存储权限.怎么了？

Answer 1

怎么了？

获取主设备所有者驻留在Android/data/外部存储上的目录的正确方法就是调用getExternalFilesDir()可用的目录Context.更换:

    String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
    File folder = new File(extStorageDirectory, "/Android/data/" + context.getPackageName());

有:

    File folder = context.getExternalFilesDir();