Java Android在内部存储中创建目录在Android 7.0中不起作用？

如果android中不存在具有权限的目录，我将在async中使用此代码创建目录。我的代码在安卓5.1中成功运行，但当我在安卓7.0中部署应用程序时，该目录不会自动创建

   File sdcard = Environment.getExternalStorageDirectory() ;
        File folder = new File(sdcard.getAbsoluteFile(), "Quoteimages");
        if(!folder.exists()){
            folder.mkdir();

        }

清单文件是

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

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

链接到应用程序apk的详细信息

---

现在我该怎么做我想创建文件夹写图片从url到它，然后读取它们。这在android 5.1中适用，但在android版本7中不适用。

您需要为棒棒糖以上的android版本实现运行时权限

也许这段代码可以帮助您：

private static final int PERMS_REQUEST_CODE = 123;

//徖

 private boolean hasPermissions(){
    int res = 0;
    //string array of permissions,
    String[] permissions = new String[]
{android.Manifest.permission.WRITE_EXTERNAL_STORAGE};

    for (String perms : permissions){
        res = checkCallingOrSelfPermission(perms);
        if (!(res == PackageManager.PERMISSION_GRANTED)){
            return false;
        }
    }
    return true;
}

private void requestPerms(){
    String[] permissions = new String[]{android.Manifest.permission.WRITE_EXTERNAL_STORAGE};
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
        requestPermissions(permissions,PERMS_REQUEST_CODE);
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    boolean allowed = true;

    switch (requestCode){
        case PERMS_REQUEST_CODE:

            for (int res : grantResults){
                // if user granted all permissions.
                allowed = allowed && (res == PackageManager.PERMISSION_GRANTED);
            }

            break;
        default:
            // if user not granted permissions.
            allowed = false;
            break;
    }

    if (allowed){
        //user granted all permissions we can perform our task.
        ListItem listItem = new ListItem();
        Glide.with(getApplicationContext()).asBitmap().load(listItem.getImgurl()).into(new SimpleTarget<Bitmap>(){



            @Override
            public void onResourceReady(Bitmap resource, Transition<? super Bitmap> transition) {
                FileOutputStream fileOutputStream = null;
                File file = getDisc();
                if(!file.exists()&& !file.mkdirs()){

                    Toast.makeText(getApplicationContext(),"Can't create directory to save image", Toast.LENGTH_LONG).show();
                    return;
                }

                SimpleDateFormat simpleDataFormat = new SimpleDateFormat("yyyymmsshhmmss");
                String date = simpleDataFormat.format(new Date());
                String name = "img"+date+".jpg";
                String file_name = file.getAbsolutePath()+"/"+name;
                File new_file= new File(file_name);
                try {
                    fileOutputStream=new FileOutputStream(new_file);
                    resource.getHeight();
                    resource.getWidth();
                    resource.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream);
                    Toast.makeText(getApplicationContext(),"SAVED", Toast.LENGTH_LONG).show();
                    fileOutputStream.flush();
                    fileOutputStream.close();

                } catch (FileNotFoundException e) {
                    e.printStackTrace();
                } catch (IOException e) {
                    e.printStackTrace();
                }
                refreshGallery(new_file);

            }
            public void refreshGallery(File file){

                Intent intent = new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE);
                intent.setData(Uri.fromFile(file));
                sendBroadcast(intent);

            }


            private File getDisc(){



                File file = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES);
                return new File(file, "FolderNamerYourChoice");
            }
        });

    }
    else {
        // we will give warning to user that they haven't granted permissions.
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            if (shouldShowRequestPermissionRationale(android.Manifest.permission.WRITE_EXTERNAL_STORAGE)){
                Toast.makeText(this, "Storage Permissions denied.", Toast.LENGTH_SHORT).show();
            }
        }
    }

private boolean hasPermissions（）{
int res=0；
//权限的字符串数组，
字符串[]权限=新字符串[]
{android.Manifest.permission.WRITE_EXTERNAL_STORAGE}；
for（字符串perms:权限）{
res=checkCallingOrSelfPermission（perms）；
如果（！（res==PackageManager.PERMISSION\u已授予））{
返回false；
}
}
返回true；
}
私有void requestPerms（）{
字符串[]权限=新字符串[]{android.Manifest.permission.WRITE\u EXTERNAL\u STORAGE}；
if（Build.VERSION.SDK\u INT>=Build.VERSION\u code.M）{
请求权限（权限、权限请求代码）；
}
}
@凌驾
public void onRequestPermissionsResult（int-requestCode，@NonNull-String[]permissions，@NonNull-int[]grantResults）{
允许布尔值=真；
开关（请求代码）{
案例PERMS\U请求\U代码：
对于（int res:grantResults）{
//如果用户授予了所有权限。
allowed=allowed&（res==PackageManager.PERMISSION\u provided）；
}
打破
违约：
//如果用户未被授予权限。
允许=错误；
打破
}
如果（允许）{
//用户授予了我们可以执行任务的所有权限。
ListItem ListItem=新ListItem（）；
Glide.with（getApplicationContext（））.asBitmap（）.load（listItem.getImgurl（））.into（new SimpleTarget（））{
@凌驾
public void onResourceReady（位图资源，Transitional）因此，没有名为
READ\u INTERNAL\u STORAGE
或
WRITE\u INTERNAL\u STORAGE
的权限。android 7.0的可能副本更改了应用程序的文件系统。