我正在尝试通过指纹身份验证实现指纹解锁或删除锁定 View ，使用传感器现有的注册指纹进一步显示内容，但指纹身份验证在正常 Activity 中工作正常但在自定义 View 中不起作用，我也尝试过在我的自定义屏幕锁定应用程序中实现它，但它有冲突或可能是由于资源不可用而面临此错误“FINGERPRINT_ERROR_CANCELED”，错误代码为 5

我不确定是不是由于资源不可用，因为同时内置的安全密码/图案锁也使用相同的指纹传感器以及我自己的屏幕锁或自定义 View

这段代码运行良好 Activity 代码

 fingerprintHandler = new FingerprintHandler();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

            keyguardManager =
                    (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
            mFingerprintManager =
                    (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);

//
//            generateKey();
//            if (cipherInit()) {
//                cryptoObject =
//                        new FingerprintManager.CryptoObject(cipher);
            fingerprintHandler.setOnAuthenticationListener(new FingerprintManager.AuthenticationCallback() {
                @RequiresApi(api = Build.VERSION_CODES.M)
                @Override
                public void onAuthenticationError(int errorCode, CharSequence errString) {
                    Toast.makeText(FingerprintNormalActivity.this,
                            "Authentication error\n" + "Error code" + errorCode + "\nError String" + errString,
                            Toast.LENGTH_LONG).show();
                    imageViewSmokeImages.setImageResource(R.drawable.fingerprinterror);
                    tvstatus.setText("Authentication error\n" + "Error code" + errorCode + "\nError String" + errString);
                }

                @RequiresApi(api = Build.VERSION_CODES.M)
                @Override
                public void onAuthenticationHelp(int helpCode, CharSequence helpString) {`enter code here`
                    Toast.makeText(FingerprintNormalActivity.this,
                            "Authentication help\n" + helpString,
                            Toast.LENGTH_LONG).show();
                    imageViewSmokeImages.setImageResource(R.drawable.help);
                    tvstatus.setText("Authentication help\n" + helpString);

                }

                @Override
                public void onAuthenticationSucceeded(FingerprintManager.AuthenticationResult result) {
                    Toast.makeText(FingerprintNormalActivity.this,
                            "Authentication succeeded.",
                            Toast.LENGTH_LONG).show();
                    imageViewSmokeImages.setImageResource(R.drawable.fingerprintsuccess);
                    tvstatus.setText("Authentication Successfull");

                    finish();
                }

                @RequiresApi(api = Build.VERSION_CODES.M)
                @Override
                public void onAuthenticationFailed() {
                    Toast.makeText(FingerprintNormalActivity.this,
                            "Authentication failed.",
                            Toast.LENGTH_LONG).show();
                    tvstatus.setText("Authentication failed");

                    imageViewSmokeImages.setImageResource(R.drawable.fingerprintfailed);


                }
            });
//            new AuthenticateUser();

////                fingerprintHandler.startListening();
            if (!getKeyStore())
                return;

            if (!createNewKey(false)) {
                return;
            }
            if (!getCipher()) {
                return;
            }
            if (!initCipher(Cipher.ENCRYPT_MODE)) {
                return;
            }
            if (!initCryptObject()) {
                return;
            } else {
                fingerprintHandler.startListening(cryptoObject);
            }
//            }
        }

这是我要收听的指纹处理类

private static FingerprintManager.AuthenticationCallback mAuthenticationCallback;
    private static CancellationSignal mCancellationSignal;
    private static Context mContext;

    @RequiresApi(api = Build.VERSION_CODES.M)
    public class FingerprintHandler {

        public void setOnAuthenticationListener(FingerprintManager.AuthenticationCallback listener) {
            mAuthenticationCallback = listener;
        }

        public void startListening() {
            if (isFingerScannerAvailableAndSet()) {
                try {
                    mCancellationSignal = new CancellationSignal();
                    mFingerprintManager.authenticate(null, mCancellationSignal, 0 /* flags */, mAuthenticationCallback, new Handler(Looper.getMainLooper()));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

        public void startListening(FingerprintManager.CryptoObject cryptoObject) {
            if (isFingerScannerAvailableAndSet()) {
                try {
                    mCancellationSignal = new CancellationSignal();
                    mFingerprintManager.authenticate(cryptoObject, mCancellationSignal, 0 /* flags */, mAuthenticationCallback, new Handler(Looper.getMainLooper()));
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

        public void stopListening() {
            if (isFingerScannerAvailableAndSet()) {
                try {
                    mCancellationSignal.cancel();
                    mCancellationSignal = null;
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }

        public boolean isFingerScannerAvailableAndSet() {
            if (Build.VERSION.SDK_INT < Build.VERSION_CODES.M)
                return false;
            if (ActivityCompat.checkSelfPermission(FingerprintNormalActivity.this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
                Toast.makeText(FingerprintNormalActivity.this, "User hasn't granted permission to use Fingerprint", Toast.LENGTH_LONG).show();
                return false;
            }
            if (mFingerprintManager == null){
                Toast.makeText(FingerprintNormalActivity.this,
                        "mFingerprintManager is null",
                        Toast.LENGTH_LONG).show();
                tvstatus.setText("mFingerprintManager is null");
                return false;
            }
            if (!mFingerprintManager.isHardwareDetected()) {
                Toast.makeText(FingerprintNormalActivity.this,
                        "fingerprint hardware not present or not functional",
                        Toast.LENGTH_LONG).show();
                tvstatus.setText("fingerprint hardware not present or not functional");
                return false;
            }
            if (!mFingerprintManager.hasEnrolledFingerprints()) {
                Toast.makeText(FingerprintNormalActivity.this,
                        "no fingerprint enrolled/saved",
                        Toast.LENGTH_LONG).show();
                tvstatus.setText("no fingerprint enrolled/saved");
                return false;
            }
            return true;
        }
    }

最佳答案

参见 this issue .这似乎发生在大多数设备上，需要作为特殊情况处理。似乎对我有用的是在这个错误上停止指纹监听器，然后再次重新启动它。

@Override
    public void onAuthenticationError(int errMsgId, CharSequence errString)            {
     if (errMsgId == FingerprintManager.FINGERPRINT_ERROR_CANCELED){
         stopListening();
         restartListeningToFingerprint();
     }
}

在 restartListening() 方法中，我只是用一个新的 Cipher 实例调用 startListening。这似乎适用于我拥有的所有设备。但我确实看到一些三星设备出现一些随机的致命异常，这可能是它的副作用。我很好奇其他人是如何处理这个错误的。

关于android - 自定义 View android 中的 "FINGERPRINT_ERROR_CANCELED"错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/42921294/