Android nougat USE_FINGERPRINT permissions

Question

I'm trying to implement the fingerprint and not sure if it's an issue but on Android Nougat the permissions for the USE_FINGERPRINT is never asked. So I never get the dialog popup. I have the implementation for ACCESS_FINE_LOCATION and it works (the app ask to allow or deny).

In my manifest:

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

<uses-feature
    android:name="android.hardware.fingerprint"
    android:required="false" />

In the fragment

if (ActivityCompat.checkSelfPermission(getActivity(),Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
        Log.v(TAG, "NO permissions USE_FINGERPRINT");
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            Log.v(TAG, "No requestPermissions");
            ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.USE_FINGERPRINT}, FingerprintHandler.FINGERPRINT_PERMISSION);
        }
        return;
    }

Ch4t4r · Answer 1 · 2019-03-22T08:19:33.950

21

This is normal. The Fingerprint permission is not marked as dangerous and thus you don't have to ask for access to it. It is granted automatically if you declare the permission in your manifest.

This is because you cannot access the sensor directly and all calls to it are proxied trough the FingerprintManager which is somewhat limited.

Edited March 2019: USE_FINGERPRINT is deprecated in favor of USE_BIOMETRIC, but can still be used. USE_BIOMETRIC is granted by declaring it in the manifest as well.

edited Mar 22 '19 at 08:19

answered Nov 22 '17 at 07:44

Ch4t4r

1,278
1
10
27

Well, it's super clear in the doc you just shared, thanks – returnvoid Nov 22 '17 at 19:09

score 3 · Answer 2 · answered Jul 30 '18 at 21:26

3

It wont ask you to grant permission because of its level of protection (Normal, not dangerous). So access will be automatically granted just by requesting it and without knowledge of the user.

answered Jul 30 '18 at 21:26

Juan Carlos Iturriagagoitia

71
5

score 1 · Answer 3 · answered Nov 22 '17 at 07:09

follow this steps:

Add this in manifest above permission:

 <uses-feature android:name="android.hardware.fingerprint" android:required="true" />

you always need permission to access any hardware resources of phone. So it will do that for you.

Then in activity , do following code:

   if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        keyguardManager = (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
        fingerprintManager = (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);

        if (!fingerprintManager.isHardwareDetected()) {
            Toast.makeText(getApplicationContext(), "Your device doesn't support fingerprint authentication", Toast.LENGTH_SHORT).show();
        }
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
            Toast.makeText(getApplicationContext(), "Please enable the fingerprint permission", Toast.LENGTH_SHORT).show();

        ActivityCompat.requestPermissions(getActivity(), new String[]{Manifest.permission.USE_FINGERPRINT}, FingerprintHandler.FINGERPRINT_PERMISSION);

        }

        if (!fingerprintManager.hasEnrolledFingerprints()) {
            Toast.makeText(getApplicationContext(), "Your Device has no registered Fingerprints! Please register atleast one in your Device settings", Toast.LENGTH_LONG).show();
        }
}

I think it work for you. Thanks!!

It didn't work. Still no ask fo permission. I think the comment below is right — returnvoid, Nov 22 '17 at 19:07
also if you make the feature required the app will only be installed in devices with the feature which in my case is not what I need — returnvoid, Nov 22 '17 at 19:10
Ya actually now. It checks for device resources wheather it contains fingerprint or not — Ankit Patidar, Nov 22 '17 at 20:32

Android nougat USE_FINGERPRINT permissions

3 Answers3