Android将生物识别技术更新为1.0.0-alpha04后，Android崩溃了

Question

Everything works fine with 'androidx.biometric:biometric:1.0.0-alpha03' , however when I build my project with the latest 'androidx.biometric:biometric:1.0.0-alpha04' and call myBiometricPrompt.authenticate(promptInfo) it throws this exception: FragmentManager is already executing transactions .

Here is the stacktrace:

 java.lang.IllegalStateException: FragmentManager is already executing transactions
        at androidx.fragment.app.FragmentManagerImpl.ensureExecReady(FragmentManager.java:2207)
        at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2267)
        at androidx.fragment.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:814)
        at androidx.biometric.BiometricPrompt.authenticateInternal(BiometricPrompt.java:525)
        at androidx.biometric.BiometricPrompt.authenticate(BiometricPrompt.java:465)
        at com.my.app.ui.LoginFragment.handleTouchIdAuth(LoginFragment.kt:161)
        at com.my.app.ui.LoginFragment.onViewCreated(LoginFragment.kt:62)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1471)
        at androidx.fragment.app.FragmentManagerImpl.addAddedFragments(FragmentManager.java:2646)
        at androidx.fragment.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2416)
        at androidx.fragment.app.FragmentManagerImpl.removeRedundantOperationsAndExecute(FragmentManager.java:2372)
        at androidx.fragment.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2273)
        at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3273)
        at androidx.fragment.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3229)
        at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:2466)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1483)
        at androidx.fragment.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1784)
        at androidx.fragment.app.FragmentManagerImpl.moveToState(FragmentManager.java:1852)
        at androidx.fragment.app.FragmentManagerImpl.dispatchStateChange(FragmentManager.java:3269)
        at androidx.fragment.app.FragmentManagerImpl.dispatchActivityCreated(FragmentManager.java:3229)
        at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:201)
        at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:620)
        at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:178)
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1391)
        at android.app.Activity.performStart(Activity.java:7157)
        at android.app.ActivityThread.handleStartActivity(ActivityThread.java:2937)
        at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:180)
        at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:165)
        at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:142)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:70)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1808)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:193)
        at android.app.ActivityThread.main(ActivityThread.java:6669)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)

Does anyone know what happened and what to do? For now, I'll stick with version 1.0.0-alpha03

Thank you!

Answer 1

There seems to be an issue with alpha04, reverting to alpha03 fixes it. Guess we'll have to wait for alpha05 before upgrading.

Just wish Google had waited until the biometrics library was out of alpha before deprecating the fingerprint library...

Answer 2

The problem still exists in latest version androidx.biometric:biometric:1.0.0-beta01 .

To fix it is to display biometricPrompt from handler:

    val promptInfo = BiometricPrompt.PromptInfo.Builder()
            .setTitle(fragmentActivity.getString(title))
            .setNegativeButtonText(fragmentActivity.getString(negativeButtonText))
            .build()
    val biometricPrompt = BiometricPrompt(...)

    // display biometricPrompt from handler
    Handler().post {
        biometricPrompt.authenticate(promptInfo)
    }

Answer 3

The problem is fixed in androidx.biometric:biometric:1.0.0-beta01 by providing a second constructor. Until this release, i solved the issue by reverting to alpha03 but there's an actual solution available now.

You can find the beta01 release notes here

We've introduced a second constructor for BiometricPrompt that allows it to be hosted in a Fragment (as opposed to the existing constructor, which requires a FragmentActivity).

You can find the new BiometricPrompt constructor documentation here

BiometricPrompt(Fragment fragment, Executor executor, BiometricPrompt.AuthenticationCallback callback)

To fix, please follow the simple steps:

1. Change your build.gradle to use biometric version 1.0.0-beta01

2. Use the new constructor. In short, change the first argument to your fragment instead of the activity. See my code change below:

    val biometricPrompt = BiometricPrompt(activity!!, executor, callback) // Change the above line to the below line val biometricPrompt = BiometricPrompt(this, executor, callback)