U5mx4Ptj

1    // ---------------------------------------------------------------------------------------------
2    private void showBiometricPrompt() throws Exception {
3        BiometricPrompt.AuthenticationCallback authenticationCallback = getAuthenticationCallback();
4        // ATTENZIONE viene eseguita sul UIThread
5        biometricPrompt = new BiometricPrompt(this, bioMainExecutor, authenticationCallback);
6
7        // Set prompt info
8        // If device credential is supported, promptInfo need setDeviceCredentialAllowed set to true
9        if (password) {
10            promptInfo = new BiometricPrompt.PromptInfo.Builder()
11                    .setDescription(getString(R.string.prompt_desc_biometric))
12                    .setTitle(getString(R.string.prompt_title))
13                    .setSubtitle("\n")
14                    // Cannot call setNegativeButtonText() and
15                    // setDeviceCredentialAllowed() at the same time.
16                    .setDeviceCredentialAllowed(true)
17                    .build();
18
19            Log.i(TAG, "Show biometric prompt");
20            biometricPrompt.authenticate(promptInfo);
21        }
22        // If device credential not supported, use setNegativeButtonText
23        else {
24            promptInfo = new BiometricPrompt.PromptInfo.Builder()
25                    .setDescription(getString(R.string.prompt_desc_biometric))
26                    .setTitle(getString(R.string.prompt_title))
27                    .setSubtitle("\n")
28                    // The negative button will return the errCode 5
29                    // You can handle the negative button
30                    .setNegativeButtonText(getString(R.string.prompt_neg_btn))
31                    .build();
32
33            // Get cipher for cryptography
34            // Device credential not supported with crypto
35            cryptoManager.genCrypt();
36            cipher = cryptoManager.getCipher();
37            SecretKey secretKey = cryptoManager.getSecretKey();
38            cipher.init(Cipher.ENCRYPT_MODE, secretKey);
39            
40            Log.i(TAG, "Show biometric prompt");
41            biometricPrompt.authenticate(promptInfo, new BiometricPrompt.CryptoObject(cipher));
42        }
43    }