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

Question

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) 

Answer 1

implementation androidx.browser:browser:1.2.0

Use this dependency to solve the problem.

Answer 2

In new Firebase auth version,they've made major changes like Recaptcha , SafetyNet for human verification. By adding

implementation "androidx.browser:browser:1.3.0"

it solved my problem but user experience was not good because firebase was opening browser to verify reCAPTCHA and that was looking odd in app flow.

Firebase Quote "The reCAPTCHA flow will only be triggered when SafetyNet is unavailable or your device does not pass suspicion checks. Nonetheless, you should ensure that both scenarios are working correctly." So to enable SafetyNet follow below steps or you can also visit Firebase Auth for more info.

1. Go to google cloud console , select your project .

2. Click on navigation menu and select APis & services and then select Dashboard .

3. Click on enable api and services and enable api " Android Device Verification".

4. Add SHA 256 in firebase project settings.(debug and release both)

5. Download and replace the latest google-services.json file in your project.