檢查邏輯

//是否支持指紋 if (!fingerprintManager.isHardwareDetected()) {return; }//權限 if (ActivityCompat.checkSelfPermission(this, Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED) {return; }//是否已經添加過指紋 if (!fingerprintManager.hasEnrolledFingerprints()) {return; }//是否有鎖屏密碼 if (!keyguardManager.isKeyguardSecure()) {return; }

與KeyStore配合使用

Key授權綁定

指紋跟鎖屏密碼強綁定

指紋沒有鎖屏碼安全，所以操縱指紋需要鎖屏碼授權指紋能夠被復制 "a fingerprint may be less secure than a strong PIN, pattern, or password." (https://support.google.com/nexus/answer/6300638?hl=en)(需要知道指紋是誰的, 有指紋但沒鎖屏碼->不知道是誰的指紋)操縱指紋需要鎖屏碼認證

鎖屏密碼:更安全(其他人無法增刪改指紋), miui關閉鎖屏密碼不會刪指紋

android支持的身份標識:鎖屏碼,指紋

Nexus-6P/Nexus-5X:關閉鎖屏密碼會刪除所有指紋 Miui:關閉鎖屏密碼不會刪除指紋, 但下次打開鎖屏密碼時有保留指紋的確認

KeyPermanentlyInvalidatedException (Key失效)

使用流程

Request fingerprint authentication permission within the project's AndroidManifest file.Enable any lock screen security mechanism (PIN, pattern or password).Register at least one fingerprint on the device.Create an instance of the FingerprintManager.Use a Keystore instance to gain access to the Android Keystore container.Generate an encryption key using the KeyGenerator class and store it in the Keystore container.Initialise an instance of the Cipher class using the previously generated encryption key.Use the Cipher instance to create a CryptoObject and assign it to the instantiated FingerprintManager.Call the authenticate() method of the FingerprintManager instance.Handle callbacks on completion of a successful authentication, providing access to protected content or functionality.

總結

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