如何在 under marshmallow 设备上添加指纹认证

Question

先生，我正在尝试在我的应用程序中添加指纹验证。我有支持指纹认证的 Coolpad note 3 lite 手机，它是运行 on Android version 5.1 Lollipop。但问题是我如何验证其中的指纹。我看过 Android 开发人员文档，他们说只有在 Marshmallow 或更高版本的设备运行上才有可能。那么我怎样才能在我的设备上做到这一点..

我在网上找到的代码是这样的：

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
        //Get an instance of KeyguardManager and FingerprintManager//
        keyguardManager =
                (KeyguardManager) getSystemService(KEYGUARD_SERVICE);
        fingerprintManager =
                (FingerprintManager) getSystemService(FINGERPRINT_SERVICE);

        textView = (TextView) findViewById(R.id.textview);

        //Check whether the device has a fingerprint sensor//
        if (!fingerprintManager.isHardwareDetected()) {
            // If a fingerprint sensor isn’t available, then inform the user that they’ll be unable to use your app’s fingerprint functionality//
            textView.setText("Your device doesn't support fingerprint authentication");
        }
        //Check whether the user has granted your app the USE_FINGERPRINT permission//
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {
            // If your app doesn't have this permission, then display the following text//
            textView.setText("Please enable the fingerprint permission");
        }

        //Check that the user has registered at least one fingerprint//
        if (!fingerprintManager.hasEnrolledFingerprints()) {
            // If the user hasn’t configured any fingerprints, then display the following message//
            textView.setText("No fingerprint configured. Please register at least one fingerprint in your device's Settings");
        }

        //Check that the lockscreen is secured//
        if (!keyguardManager.isKeyguardSecure()) {
            // If the user hasn’t secured their lockscreen with a PIN password or pattern, then display the following text//
            textView.setText("Please enable lockscreen security in your device's Settings");
        } else {
            try { generateKey();
            } catch (FingerprintException e) {
                e.printStackTrace();
            }

            if (initCipher()) {
                //If the cipher is initialized successfully, then create a CryptoObject instance//
                cryptoObject = new FingerprintManager.CryptoObject(cipher);

                // Here, I’m referencing the FingerprintHandler class that we’ll create in the next section. This class will be responsible
                // for starting the authentication process (via the startAuth method) and processing the authentication process events//
                FingerprintHandler helper = new FingerprintHandler(this);
                helper.startAuth(fingerprintManager, cryptoObject);
            }
        }
    }

Answer 1

指纹扫描仪不是以下 Marshmallow 中的功能（现在在 Android M 上可用）。

因此三星、摩托罗拉、HTC 等每家公司都创建了自己的 API 和 SDK 来访问指纹传感器。

或者你可以使用Support Library v4的FingerprintManagerCompat class来支持23以下的minSdk。

在 Developer Doc

上查找更多信息

github sample

根据@Michael 评论

请注意，FingerprintManagerCompat 不允许您访问 Marshmallow 之前的设备上可能存在的任何指纹传感器。它只是省去了您自己检查 API 级别的麻烦。

如何在 under marshmallow 设备上添加指纹认证

How to add fingerprint authentication on under marshmallow devices

android

authentication

fingerprint

android-fingerprint-api