android - getExternalFilesDir() returns null -

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one of app's users has reported error in app, context.getexternalfilesdir(null) returns null.

i have added write_external_storage permission following.

<uses-permission      android:name="android.permission.write_external_storage"      android:maxsdkversion="18" />

i have used android:maxsdkversion="18" because android documentation says write_external_storage permission not necessary write directory returned context.getexternalfilesdir(null), starting android 4.4 (sdk 19).

but, if remove android:maxsdkversion="18" permission, context.getexternalfilesdir(null) returns non null value.

the device happens oppo find 7 android 4.4.2 (sdk version 19).

can explain why happens? should fix this? removing android:maxsdkversion="18" fixes problem, per documentation, permission unnecessary in later android versions.


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