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为什么谷歌的方法在第一次尝试Fido2PendingIntent().launchPendingIntent时失败（没有显示指纹/密码提示）并带有错误代码：

SECURITY_ERR - The operation is insecure. The incoming request cannot be validated.

并且，连续尝试通常会导致上述调用正常工作（提示显示指纹/密码），并且不再出现此错误。

这些是代码的主要片段：

ListenerRegistration.java：

    try {
        // Get intent for FIDO2 operation.
        Fido2ApiClient fido2ApiClient = Fido.getFido2ApiClient( this.activity );
        Task<Fido2PendingIntent> task = fido2ApiClient.getRegisterIntent( pkcco );

        // Send intent back to UI through callback.
        Log.d( TAG, "LISTENERREGISTRATION.java IS NOW ATTEMPTING TO OPEN FINGERPRINT/SECRUITY PROMPT" );
        this.fidoDelegate.launchFidoPrompt( Tasks.await( task ), FidoPromptCallback.FIDO2_REGISTRATION );

        // Wait for authenticator to complete.
        this.fidoAuthenticatorLock.acquire();
    } catch( ExecutionException e ) {
        // Threw exception while waiting for authenticator.
        // Pass Fido2AuthenticatorException back to calling class so it can handle error appropriately.
        throw new Fido2AuthenticatorException( this.sFido2AuthenticatorErrorMessage, this.fido2ErrorCode );
    } catch( InterruptedException e ) {
        // Threw exception while waiting for authenticator.
        // Pass Fido2AuthenticatorException back to calling class so it can handle error appropriately.
        throw new Fido2AuthenticatorException( this.sFido2AuthenticatorErrorMessage, this.fido2ErrorCode );
    }

MainActivity.java：

       // Instantiate class to handle VC functionality called by listener.
       this.lo = new ListenerOperations(MainActivity.this, new FidoPromptCallback() {
        @Override
        public void launchFidoPrompt(Fido2PendingIntent fido2Intent, int iOperation) {
            // Determine how to handle authenticator result.
            int iCode;
            if (iOperation == FidoPromptCallback.FIDO2_REGISTRATION) {
                iCode = MainActivity.REQUEST_FIDO2_REGISTER;
            } else if (iOperation == FidoPromptCallback.FIDO2_ASSERTION) {
                iCode = MainActivity.REQUEST_FIDO2_ASSERTION;
            } else {
                // Invalid operation.
                iCode = -1;
            }

            try {
                // Launch the fingerprint dialog by launching the intent from FIDO2 API.
                Log.d( TAG, "MAINACTIVITY.java IS NOW ATTEMPTING TO OPEN FINGERPRINT/SECRUITY PROMPT" );
                fido2Intent.launchPendingIntent( MainActivity.this, iCode );
                Log.d( TAG, "MAINACTIVITY.java HAS OPENNED FINGERPRINT/SECRUITY PROMPT WITH NO ERRORS" );

            } catch( IntentSender.SendIntentException e ) {
                // Error launching pending intent for register request.
                Log.d(TAG, "SADFACE - FAILED TO OPEN FINGERPRINT FIDO DIALOG");
            } catch (Exception e) {
                Log.d( TAG, "GENERAL EXCEPTION OCCURRED WHEN CALLING fido2Intent.launchPendingIntent" );
                e.printStackTrace();
            }
            Log.d( TAG, "MAINACTIVITY.java END OF launchFidoPrompt()" );
        }

在失败（和成功）时，日志看起来像这样（因为即使在收到错误之后也不会抛出异常SECURITY_ERR）：

other logs
...
10-01 10:31:36.289 14272 15728 D MainActivity.java: LISTENERREGISTRATION.java IS NOW ATTEMPTING TO OPEN FINGERPRINT/SECRUITY PROMPT
...
10-01 10:31:37.589 14974 15728 D MainActivity.java: MAINACTIVITY.java IS NOW ATTEMPTING TO OPEN FINGERPRINT/SECRUITY PROMPT
10-01 10:31:37.602  4053  4953 I ActivityManager: START u0 {act=null typ=null flg=0x0 cmp=ComponentInfo{com.google.android.gms/com.google.android.gms.fido.fido2.ui.Fido2FullScreenActivity}} from uid 10031
10-01 10:31:37.623  4053  4953 D CustomFrequencyManagerService: acquireDVFSLockLocked : type : DVFS_MIN_LIMIT  frequency : 1560000  uid : 1000  pid : 4053  pkgName : AMS_APP_SWITCH@CPU_MIN@47
10-01 10:31:37.625  4053  4953 D ActivityManagerPerformance: AMP_acquire() APP_SWITCH
10-01 10:31:37.628  3633  3633 I SurfaceFlinger: id=56380 createSurf (3040x3040),2 flag=4, AppWindowToken{2800ead token=Token{77b3fc4 ActivityRecord{44bad7 u0 com.google.android.gms/.fido.fido2.ui.Fido2FullScreenActivity t7062}}}#0
10-01 10:31:37.636  4053  4953 D ActivityManager: Received ACTIVITY intent in key u0 {bcd25e2 act=nullstartActivity cmp=ComponentInfo{com.google.android.gms/com.google.android.gms.fido.fido2.ui.Fido2FullScreenActivity} res=0} from uid 10218
10-01 10:31:37.637 14974 15728 D MainActivity.java: MAINACTIVITY.java HAS OPENNED FINGERPRINT/SECRUITY PROMPT WITH NO ERRORS
10-01 10:31:37.637 14974 15728 D MainActivity.java: MAINACTIVITY.java END OF launchFidoPrompt()

我的代码没有收到任何异常通知这一事实使我相信问题出在对Fido2PendingIntent().launchPendingIntent.

请注意，现在此代码中的异常：

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