奥利奥(WRITE EXTERNAL STORAGE)许可 [英] Oreo (WRITE EXTERNAL STORAGE) Permission

问题描述

根据"developer.android.com"

If the app targets Android 8.0 (API level 26), the system grants only 
READ_EXTERNAL_STORAGE at that time; however, if the app later requests 
WRITE_EXTERNAL_STORAGE, the system immediately grants that privilege 
without prompting the user.

现在，我拥有READ_EXTERNAL_STORAGE，并且我要求DownloadManager在公共下载"文件夹中下载文件

Now, I have the READ_EXTERNAL_STORAGE and I'm requesting the DownloadManager to download a file in the Public Download folder

downloadRequest.setDestinationInExternalPublicDir(Environment.DIRECTORY_DOWNLOADS, mAttachmentItem.getFilename());

不幸的是，我得到了

E/UncaughtException: java.lang.IllegalStateException: Unable to create directory: /storage/emulated/0/data/user/0/com.abc.cba/files
                                                                           at android.app.DownloadManager$Request.setDestinationInExternalPublicDir(DownloadManager.java:699)

我已经在清单中声明了这两个权限

I have declared both of permissions in the Manifest

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

读取权限已被授予，并且在运行时中我请求写入权限，系统不提示任何消息或对话框，它始终在"onRequestPermissionsResult"中被拒绝(未授予)

Read permission is already Granted and in Runtime I'm requesting Write permission, the system doesn't prompt any message or dialog, it's always Denied(Not Granted) in "onRequestPermissionsResult"

public static boolean isPermissionsToAccessStorageAreGranted(Context context, Activity activity) {
    ArrayList<String> permissions = new ArrayList<>();

    if (!PermissionUtil.checkPermissions(context, Manifest.permission.WRITE_EXTERNAL_STORAGE)) {
        permissions.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
    }

    if (!permissions.isEmpty()) {
        String[] permissionsList = permissions.toArray(new String[permissions.size()]);
        PermissionUtil.requestPermissions(activity, permissionsList,
                PermissionUtil.REQUESTCODE_ACCESS_STORAGE);
        return false;
    } else {
        return true;
    }
}


@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    if(requestCode==REQUESTCODE_ACCESS_STORAGE && grantResults[0]== PackageManager.PERMISSION_GRANTED){
 /* downloadFile(); */       
    }
}

我正在尝试通过ADB授予这两个权限，这向我显示了一个错误:

I'm trying to grant those two permissions via ADB, it shows me an error:

adb shell pm grant com.abc.cba 
android.permission.WRITE_EXTERNAL_STORAGE
Operation not allowed: java.lang.SecurityException: Package com.abc.cbs 
has not requested permission android.permission.WRITE_EXTERNAL_STORAGE

adb shell pm grant com.abc.cba 
android.permission.READ_EXTERNAL_STORAGE
Operation not allowed: java.lang.SecurityException: Can't change 
android.permission.READ_EXTERNAL_STORAGE. It is required by the 
application

推荐答案

实际上，这是一个外部问题.我正在使用的应用库之一向android:maxSdkVersion请求WRITE_EXTERNAL_PERMISSION.因此，当与我的清单合并时，它将删除整个应用程序的权限.

Actually, It was an external problem. One of App Libs I'm using request the WRITE_EXTERNAL_PERMISSION with android:maxSdkVersion. So when merging with my Manifest it will remove the permission for the whole application.

解决方案是添加:

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

这篇关于奥利奥(WRITE EXTERNAL STORAGE)许可的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！