Caused by: java.lang.ClassNotFoundException: Didn't find class in Firebase Phone Authentication

问题

I'm using Phone Authentication in Android Studio via Firebase, I Enabled Phone SignIn and Add SHA-1 And SHA-256 in Firebase Project. here is all of my dependencies :

dependencies {

implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.2'
testImplementation 'junit:junit:4.13.1'
implementation 'com.hbb20:ccp:2.4.0'
implementation 'com.google.firebase:firebase-auth:20.0.0'
implementation 'com.google.firebase:firebase-analytics'
implementation platform('com.google.firebase:firebase-bom:26.0.0')
implementation 'com.google.android.gms:play-services-safetynet:17.0.0'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}

and here is the error logs:

E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.securechat, PID: 24159
java.lang.NoClassDefFoundError: Failed resolution of: Landroidx/browser/customtabs/CustomTabsIntent$Builder;
    at com.google.firebase.auth.internal.RecaptchaActivity.zza(com.google.firebase:firebase-auth@@20.0.0:92)
    at com.google.firebase.auth.api.internal.zzeq.zza(com.google.firebase:firebase-auth@@20.0.0:79)
    at com.google.firebase.auth.api.internal.zzeq.onPostExecute(com.google.firebase:firebase-auth@@20.0.0:88)
    at android.os.AsyncTask.finish(AsyncTask.java:695)
    at android.os.AsyncTask.access$600(AsyncTask.java:180)
    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712)
    at android.os.Handler.dispatchMessage(Handler.java:106)
    at android.os.Looper.loop(Looper.java:193)
    at android.app.ActivityThread.main(ActivityThread.java:6692)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:493)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:858)
 Caused by: java.lang.ClassNotFoundException: Didn't find class "androidx.browser.customtabs.CustomTabsIntent$Builder" on path: DexPathList[[zip file "/data/app/com.example.securechat-GUvvd01g4yeRO2eP4pBFfA==/base.apk"],nativeLibraryDirectories=[/data/app/com.example.securechat-GUvvd01g4yeRO2eP4pBFfA==/lib/arm64, /system/lib64, /vendor/lib64]]
    at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:134)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
    at com.google.firebase.auth.internal.RecaptchaActivity.zza(com.google.firebase:firebase-auth@@20.0.0:92) 
    at com.google.firebase.auth.api.internal.zzeq.zza(com.google.firebase:firebase-auth@@20.0.0:79) 
    at com.google.firebase.auth.api.internal.zzeq.onPostExecute(com.google.firebase:firebase-auth@@20.0.0:88) 
    at android.os.AsyncTask.finish(AsyncTask.java:695) 
    at android.os.AsyncTask.access$600(AsyncTask.java:180) 
    at android.os.AsyncTask$InternalHandler.handleMessage(AsyncTask.java:712) 
    at android.os.Handler.dispatchMessage(Handler.java:106) 
    at android.os.Looper.loop(Looper.java:193) 
    at android.app.ActivityThread.main(ActivityThread.java:6692) 
    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) 

回答1:

implementation androidx.browser:browser:1.2.0

Use this dependency to solve the problem.

回答2:

Since you're using the firebase-bom dependency, that library determines the version of all Firebase SDKs you use. This means that you should not specify version numbers for any other Firebase SDKs in your gradle file.

So remove the version number from firebase-auth:

implementation 'com.google.firebase:firebase-auth'
implementation 'com.google.firebase:firebase-analytics'
implementation platform('com.google.firebase:firebase-bom:26.0.0')

回答3:

If someone coming from react-native, after searching all around I found this temporary solution.

Adding the below

implementation "androidx.browser:browser:1.2.0"

into android/app/build.gradle dependencies solved issue.

回答4:

You need CustomTabs to add to your project so your app in mobile can access browser using CustomTabs

implementation 'com.android.support:customtabs:28.0.0'

回答5:

Guys I have found a way just follow the steps. In "Phone Authentication docs" of firebase you will find the option (2.Enable app verification) Follow these steps:

• Enable AndroidDevice check API by clicking on it.

• Then add your SHA-256. (Gradle on your right side of android studio->Tasks->android->signingReports.)

You will get your SHA-256 there for your app.

来源：https://stackoverflow.com/questions/64588281/caused-by-java-lang-classnotfoundexception-didnt-find-class-in-firebase-phone