How to check device compatibility for finger print

问题:

I am working with finger print authentication using android 6.0 api. My requirement is, if current device is supports finger print authentication, then I will go through finger print authentication else will use normal way to login the application.

So, any one can tell me, how to check device compatibility for finger print authentication in android.

Thanks in advance.

回答1:

You have to use method isHardwareDetected on FingerprintManager class.

Determine if fingerprint hardware is present and functional. Returns true if hardware is present and functional, false otherwise.

// Check if we're running on Android 6.0 (M) or higher
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
    //Fingerprint API only available on from Android 6.0 (M)
    FingerprintManager fingerprintManager = (FingerprintManager) context.getSystemService(Context.FINGERPRINT_SERVICE);
    if (!fingerprintManager.isHardwareDetected()) { 
        // Device doesn't support fingerprint authentication     
    } else if (!fingerprintManager.hasEnrolledFingerprints()) { 
        // User hasn't enrolled any fingerprints to authenticate with 
    } else { 
        // Everything is ready for fingerprint authentication 
    }
}

Don't forget to add permission to access fingerprint functions in AndroidManifest. Since API 28:

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

Before API28:

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

With Support Library

If you don't want to check Build.VERSION, it's also possible to check on device lower than Android 6.0 with Support Library

Add dependency:

compile "com.android.support:support-v4:23.0.0"

And use FingerprintManagerCompat class as this:

FingerprintManagerCompat fingerprintManagerCompat = FingerprintManagerCompat.from(context);

if (!fingerprintManagerCompat.isHardwareDetected()) { 
    // Device doesn't support fingerprint authentication     
} else if (!fingerprintManagerCompat.hasEnrolledFingerprints()) { 
    // User hasn't enrolled any fingerprints to authenticate with 
} else { 
    // Everything is ready for fingerprint authentication 
}

回答2:

Just a follow up to LaurentY's answer. You need a permission to access the finger print scanner. And for that you need to add this to your Manifest.

API 27 and before

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

API 28 and later

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

回答3:

This method Works for all Android versions and also check for permission

 private boolean isSensorAvialable() {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
                return ActivityCompat.checkSelfPermission(AppContext, Manifest.permission.USE_FINGERPRINT) == PackageManager.PERMISSION_GRANTED &&
                        AppContext.getSystemService(FingerprintManager.class).isHardwareDetected();
            } else {
                return FingerprintManagerCompat.from(AppContext).isHardwareDetected();
            }
        }

回答4:

check this sample example from google