Android 11 adb push 权限被拒绝

Question

I have upgraded OS from Android 10 to Android 11, when I try to run adb push test.txt /mnt/sdcard/ , I am getting an error adb: error: stat failed when trying to push to /mnt/sdcard/test.txt: Permission denied .

In AndroidManisfest.xml I have given all below permissions:

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

<application
android:requestLegacyExternalStorage="true">

Answer 1

Try adb push test.txt /sdcard/ , this will work.

On Android 11, we cannot access /mnt by ADB. But use the symlink is ok, see this link for details.

I run ls command on the Android 11 emulator, we can see sdcard ->? within /mnt , and sdcard -> /storage/self/primary within / , which means softlink /mnt/sdcard is not working on Android 11.

# symeonchen @ SBook in ~ [22:16:05] 
$ adb shell ls -al / | grep sdcard   
lrw-r--r--   1 root   root         21 2020-12-17 02:01 sdcard -> /storage/self/primary

# symeonchen @ SBook in ~ [22:16:14] 
$ adb shell ls -al /mnt | grep sdcard
l?????????  ? ?      ?           ?                ? sdcard -> ?

Answer 2

According to android doc.

Apps that run on Android 11 but target Android 10 (API level 29) can still request the requestLegacyExternalStorage attribute.

So try to change your target API level. Recommended way would be to use ContentResolver or can say Scoped storage instead of Legacy deprecated storage APIs.

Check out this for more details. Scoped storage enforcement

Answer 3

Try;

adb root

This will switch the adb server as root.