android - Permission denied on writing to external storage despite permission

Question

I have an Android 7.0 test device and my APK targets = "targetSdkVersion 22", with:

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

with:

final File f = new 
File(Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + File.separator + "DressUpBaby" + photonumber + ".png");
f.createNewFile();

and at this point I get the warning:

W/System.err: java.io.IOException: Permission denied

How to get it to save the file? This was working when I created this on Eclipse, but now that I have updated and moved to Android Studio it seems to have broken something.

Answer 1

UPDATE: See Volker Voecking's answer for a better solution

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EDIT: This is simply a workaround for those who don't have time to look for a solution. *

If you get permission denied error even when the permissions are granted and you already implemented permission checks,

make sure you're not targetting api level 29:

Change targetSdkVersion and compilesdkversion from 29 to 28 or any other lower level.