奥利奥(写入外部存储)权限 [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，我有 READ_EXTERNAL_STORAGE 并且我正在请求下载管理器下载公共下载文件夹中的文件

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 Manifest 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" />

读权限已经被授予，在运行时我正在请求写权限，系统没有提示任何消息或对话框，它总是在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，它显示了一个错误:

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.我正在使用的应用程序库之一使用 android:maxSdkVersion 请求 WRITE_EXTERNAL_PERMISSION.因此，当与我的 Manifest 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(写入外部存储)权限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！