Android FingerprintManager not supported for API lower than 23

[MasterDaveh]

I was testing the module on a couple of devices with respectively API level 21 and 17.
With both of the devices I could manage to install the signed release APK but the app would just crash saying "the app has stopped".
From the Logcat in Android Studio I managed to get a stacktrace with a java.lang.RuntimeException: Could not invoke FingerprintAuth.isSupported error.
I then bumped into this SO answer which states that "FingerprintManager is supported in API 23 and Higher", which is confirmed here.

The same APK is working on a Nexus 5X with Android version 8, so API level should be 26.

Are there any known workarounds at the moment?

[szczepcio95]

Any ideas? Having the same problem

[szczepcio95]

Okey, I've got something. Just before authenticating try this

if (Platform.OS === 'android' && Platform.Version <= 23 ) {
            // not performing any TouchID actions
        }

[marcorm]

I think, in

FingerprintAuthModule.java

this:

  public void isSupported(Callback reactErrorCallback, Callback reactSuccessCallback) {
    keyguardManager = (KeyguardManager) getCurrentActivity().getSystemService(Context.KEYGUARD_SERVICE);
    fingerprintManager = (FingerprintManager) getCurrentActivity().getSystemService(Context.FINGERPRINT_SERVICE);
    if(!isFingerprintAuthAvailable()) {
      reactErrorCallback.invoke("Not supported.");
    } else {
      reactSuccessCallback.invoke("Is supported.");
    }
    return ;
  }

should become something like:

  public void isSupported(Callback reactErrorCallback, Callback reactSuccessCallback) {
    if(!isFingerprintAuthAvailable()) {
      reactErrorCallback.invoke("Not supported.");
    } else {
      keyguardManager = (KeyguardManager) getCurrentActivity().getSystemService(Context.KEYGUARD_SERVICE);
      fingerprintManager = (FingerprintManager) getCurrentActivity().getSystemService(Context.FINGERPRINT_SERVICE);
      reactSuccessCallback.invoke("Is supported.");
    }
    return ;
  }

Correct me if i'm wrong...

[gazaret]

Fixed in #96

[marcorm]

Hi @gazaret , are you sure your solution work? Because the solution i proposed is unstable...

[gazaret]

Hi @marcorm , yes it was unstable on api 23+.
Now fixed this.
Tested on android 4.4 and 7.0. It works.

[zibs]

We now have some handling for this in 4.0.3 - please give it a shot and let us know by opening a new issue if the problem persists.