Android BiometricPrompt引发NPE

编程问答 2022-08-11

问题描述

我在我的应用中使用BiometricPrompt，但是此代码在某些设备（例如Redmi 5 Plus）上引发了NullPointerException 

if (biometricManager.canAuthenticate() == BiometricManager.BIOMETRIC_SUCCESS) {
    biometricPrompt.authenticate(getPromptInfo(),cryptoObject)
}

private fun getPromptInfo(): BiometricPrompt.PromptInfo {
    return BiometricPrompt.PromptInfo.Builder()
        .setTitle("My App's Authentication")
        .setNegativeButtonText("Cancel")
        .setSubtitle("Please login to get access")
        .setDescription("My App is using Android biometric authentication")
        .build()
}

原因：

java.lang.NullPointerException：尝试调用虚拟方法'void 空对象引用上的android.widget.TextView.setVisibility（int）'

我该如何解决？

UPDATE（添加的日志）：

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setVisibility(int)' on a null object reference
        at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2817)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2895)
        at android.app.ActivityThread.-wrap11(UnkNown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616)
        at android.os.Handler.dispatchMessage(Handler.java:106)
        at android.os.Looper.loop(Looper.java:176)
        at android.app.ActivityThread.main(ActivityThread.java:6651)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824)
     Caused by: java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setVisibility(int)' on a null object reference
        at androidx.biometric.FingerprintDialogFragment.onCreateDialog(FingerprintDialogFragment.java:199)
        at androidx.fragment.app.DialogFragment.onGetLayoutInflater(DialogFragment.java:419)
        at androidx.fragment.app.Fragment.performGetLayoutInflater(Fragment.java:1484)
        at androidx.fragment.app.FragmentStateManager.createView(FragmentStateManager.java:320)
        at androidx.fragment.app.FragmentManager.movetoState(FragmentManager.java:1187)
        at androidx.fragment.app.FragmentManager.movetoState(FragmentManager.java:1356)
        at androidx.fragment.app.FragmentManager.moveFragmentToExpectedState(FragmentManager.java:1434)
        at androidx.fragment.app.FragmentManager.movetoState(FragmentManager.java:1497)
        at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:2625)
        at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2577)
        at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:247)
        at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:541)
        at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:210)
        at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1335)
        at android.app.Activity.performStart(Activity.java:7108)
        at android.app.ActivityThread.performlaunchActivity(ActivityThread.java:2780)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2895) 
        at android.app.ActivityThread.-wrap11(UnkNown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1616) 
        at android.os.Handler.dispatchMessage(Handler.java:106) 
        at android.os.Looper.loop(Looper.java:176) 
        at android.app.ActivityThread.main(ActivityThread.java:6651) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:547) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:824) 

解决方法

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androidandroidandroid-biometric-prompt