如何在 onCreate() 中重复验证指纹

Question

这 basic Android tutorial app is going to print a Toast message verifying the fingerprint authentication. But it is only able to authenticate once. I want it to be able to reauthenticate fingerprint whenever the app is still running. I've tried to add a while loop wrapping around the helper.startAuth() and it is not working. I've referenced several questions (1,2,3) 但其中 none 正在帮助我。这是我试过的方法，但没有用。

if (cipherInit()) {
    cryptoObject = new FingerprintManager.CryptoObject(cipher);
    FingerprintHandler helper = new FingerprintHandler(this);
    while(true){
        helper.startAuth(fingerprintManager, cryptoObject);
    }
}

这是我的 onCreate()。感谢您的帮助和指导

    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

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

    if (!keyguardManager.isKeyguardSecure()){
        Toast.makeText(this,
                "Lock screen security is not enable in Settings", Toast.LENGTH_LONG).show();
        return;
    }

    if (ActivityCompat.checkSelfPermission(this,
            Manifest.permission.USE_FINGERPRINT) != PackageManager.PERMISSION_GRANTED){
        Toast.makeText(this,
                "Fingerprint authentication permission is not enabled", Toast.LENGTH_LONG).show();
        return;
    }

    if (!fingerprintManager.hasEnrolledFingerprints()){
        Toast.makeText(this, "Register at least one fingerprint in Settings", Toast.LENGTH_LONG).show();
        return;
    }

    generateKey();
    if (cipherInit()) {
        cryptoObject = new FingerprintManager.CryptoObject(cipher);
        FingerprintHandler helper = new FingerprintHandler(this);
        helper.startAuth(fingerprintManager, cryptoObject);

    }

}

Answer 1

您不能在 onCreate 中重复执行任何操作。 OnCreate 需要完成并继续，否则应用程序将被看门狗杀死。事实上，你永远不应该在 UI 线程上重复做任何事情。您需要在另一个线程（或 AsyncTask）或某种计时器上执行此操作。

如何在 onCreate() 中重复验证指纹

How To Repeatedly Authenticate FingerPrint in onCreate()

java

android

android-fingerprint-api