Android Question WRITE_EXTERNAL_STORAGE error

hanyelmehy · Mar 12, 2017

i use this in manifest

B4X:

AddManifestText(
<uses-sdk android:minSdkVersion="9" android:targetSdkVersion="23"/>
AddManifestText(
<uses-permission
  android:name="android.permission.WRITE_EXTERNAL_STORAGE"
  android:maxSdkVersion="18" />
)
AddManifestText(
<uses-permission
  android:name="android.permission.READ_EXTERNAL_STORAGE"
  android:maxSdkVersion="18" />
)

When check for

B4X:

RP.Check(RP.PERMISSION_WRITE_EXTERNAL_STORAGE)

return true
and when i try to copy file to EXTERNAL_STORAGE i get

B4X:

(ErrnoException) android.system.ErrnoException: open failed: EACCES (Permission denied)

test done with B4A 6.3 and android 6.0

Erel · Mar 13, 2017

1. It is almost always a mistake to call RP.Check. You should use RP.CheckAndRequest and continue the program flow from the PermissionResult event.
2. Your code is wrong. You have confused two different things. If you set the maxSdkVersion to the permission then you need to use RuntimePermission.GetSafeDirDefaultExternal.

hanyelmehy · Mar 13, 2017

Erel said:
1. It is almost always a mistake to call RP.Check. You should use RP.CheckAndRequest and continue the program flow from the PermissionResult event.
2. Your code is wrong. You have confused two different things. If you set the maxSdkVersion to the permission then you need to use RuntimePermission.GetSafeDirDefaultExternal.

Thank you for your answer
i get no 1
i still have confused about no 2 :
in my app ,after download a file i save it to (File.DirInternalCache) ,and i asked user to save it in any other place if he want ,what is your recommendation to do that ,because i have above problem if user select external storage path

Erel · Mar 13, 2017

If you want to allow the user to choose File.DirRootExternal then you should remove this section from the manifest editor:

B4X:

AddManifestText(
<uses-permission
 android:name="android.permission.WRITE_EXTERNAL_STORAGE"
 android:maxSdkVersion="18" />
)
AddManifestText(
<uses-permission
 android:name="android.permission.READ_EXTERNAL_STORAGE"
 android:maxSdkVersion="18" />
)

hanyelmehy · Mar 13, 2017

Erel said:
If you want to allow the user to choose File.DirRootExternal then you should remove this section from the manifest editor:

B4X:

AddManifestText( <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" android:maxSdkVersion="18" /> ) AddManifestText( <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" android:maxSdkVersion="18" /> )

so i well use only

B4X:

AddPermission(android.permission.WRITE_EXTERNAL_STORAGE)
AddPermission(android.permission.READ_EXTERNAL_STORAGE)

because when i use this and test on android 6 i get java.io.FileNotFoundException: /mnt/m_external_sd/file name: open failed: EACCES (Permission denied)

hanyelmehy · Mar 13, 2017

also what is the behavior for

B4X:

RP.CheckAndRequest(RP.PERMISSION_WRITE_EXTERNAL_STORAGE)
RP.CheckAndRequest(RP.PERMISSION_READ_EXTERNAL_STORAGE)

when app run on android 4.0 when targetSdkVersion is set to 23 or above.
and use

B4X:

AddPermission(android.permission.WRITE_EXTERNAL_STORAGE) AddPermission(android.permission.READ_EXTERNAL_STORAGE)

Erel · Mar 13, 2017

1. You don't need to add the permissions yourself. They will be added automatically.

2. You need to call CheckAndRequest before you can access File.DirRootExternal or File.DirDefaultExternal.

hanyelmehy said:
also what is the behavior for

See "the method logic" section: https://www.b4x.com/android/forum/threads/runtime-permissions-android-6-0-permissions.67689/

Android Question WRITE_EXTERNAL_STORAGE error

hanyelmehy

Active Member

Erel

B4X founder

hanyelmehy

Active Member

Erel

B4X founder

hanyelmehy

Active Member

hanyelmehy

Active Member

Erel

B4X founder

Similar Threads

Android Question WRITE_EXTERNAL_STORAGE error

hanyelmehy

Active Member

Erel

B4X founder

hanyelmehy

Active Member

Erel

B4X founder

hanyelmehy

Active Member

hanyelmehy

Active Member

Erel

B4X founder

Similar Threads

Privacy & Transparency

Privacy & Transparency