Failed to resolve: firebase-database-15.0.0

问题:

connecting firebase real-time database with assistant when adding the dependencies of firebase database this error is showing:

Failed to resolve: firebase-database-15.0.0

this also happened with authentication

My android studio version 3.2 build September 18

回答1:

There's an annoying bug in the new versions of Android Studio (I've seen versions 3.2.1 or higher on both Windows and Mac). if you integrate firebase automatically from tools, Thןד gives you an unwanted add-on that de-compile the program.

for example:

implementation 'com.google.firebase:firebase-database:16.0.1:15.0.0'

instead of:

implementation 'com.google.firebase:firebase-database:16.0.1'

Just drop the unnecessary extra after the ':'

Note that the example is for a database If you need something else substitute the word database in your library, for example ads.

回答2:

Remove,

implementation 'com.google.firebase:firebase-database:16.0.1:15.0.0'

Add following lines and sync project.

implementation 'com.google.firebase:firebase-database:16.0.6'
implementation 'com.google.firebase:firebase-core:16.0.6'

Note: use the latest version from https://firebase.google.com/docs/android/setup

回答3:

I had this same problem. but now worked for me.Try This add the dependency for Authentication to your app-level build.gradle file.

implementation 'com.google.firebase:firebase-auth:16.0.3'

When you click on add dependency this again ask you add the statement implementation 'com.google.firebase:firebase-auth:16.0.1:15.0.0' So This button does not need to be triggered to authenticate the app.

回答4:

You can update this in the app/Build Gradle dependencies:

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0'
    implementation 'com.google.firebase:firebase-core:16.0.3'
    implementation 'com.android.support.constraint:constraint-layout:1.1.3'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'com.android.support.test:runner:1.0.2'
    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
    implementation 'com.google.firebase:firebase-database:15.0.0'
}
apply plugin: 'com.google.gms.google-services'

This must help you to get rid of the error!

回答5:

Update your gradle in the root Build.gradle first:

classpath 'com.android.tools.build:gradle:3.2.0'

Then use & update this in the app/Build.gradle dependencies:

implementation com.google.firebase:firebase-database:16.0.2

---

I believe you're trying to download another non-exist dependency, that's why you get the error:

Failed to resolve: firebase-database-15.0.0

Check: https://mvnrepository.com/artifact/com.google.firebase/firebase-database/16.0.2

And here: https://firebase.google.com/docs/android/setup

回答6:

I get a issue like this sometimes, 1)restart the PC, or 2) delete C:\Users\.gradle and then restart the machine.

If you are using ionic then delete the .ionic as well.

回答7:

You are getting the following error:

Failed to resolve: firebase-database-15.0.0

Because you are using a wrong dependency in your code. To solve this, please change the following line of code:

implementation 'com.google.firebase:firebase-database:16.0.1:15.0.0'

to

implementation 'com.google.firebase:firebase-database:16.0.2'

Because such a version 16.0.1:15.0.0 does not exist.

Please also add the following dependency which is now mandatory:

    implementation 'com.google.firebase:firebase-core:16.0.3'

Your app gradle file now has to explicitly list com.google.firebase:firebase-core as a dependency for Firebase services to work as expected.

In your top level build.gradle file please be sure to have the latest version of Google Service plugin:

classpath 'com.google.gms:google-services:4.1.0'

回答8:

When adding Firebase dependencies, always try finding the latest version it.
As of this time: firebase-database:16.0.5
But always check: https://firebase.google.com/docs/android/setup

回答9:

Just delete 15:0.0 and rebuild the project. It works implementation 'com.google.firebase:firebase-database:16.0.5:15.0.0'