Add Google Maven repository to Android Studio Project

With latest Android Studio, I change the targetSdkVersion and compileSdkVersion of my old exercise to 28. And I also have to use updated com.android.support:appcompat-v7 and com.android.support.constraint:constraint-layout. After fail in rebuild, it's a number of WARNING and ERROR.

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ERROR: Failed to resolve: com.android.support:appcompat-v7:28.0.0
Add Google Maven repository and sync project
Show in Project Structure dialog
Affected Modules: app

ERROR: Failed to resolve: com.android.support.constraint:constraint-layout:1.1.3
Add Google Maven repository and sync project
Show in Project Structure dialog
Affected Modules: app

WARNING: Configuration 'compile' is obsolete and has been replaced with 'implementation' and 'api'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html
Affected Modules: app

WARNING: Configuration 'testCompile' is obsolete and has been replaced with 'testImplementation'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html
Affected Modules: app

WARNING: Configuration 'androidTestCompile' is obsolete and has been replaced with 'androidTestImplementation'.
It will be removed at the end of 2018. For more information see: http://d.android.com/r/tools/update-dependency-configurations.html
Affected Modules: app
-----------------------------

As suggested, I change  'compile', 'testCompile' and 'androidTestCompile' to 'implementation', 'testImplementation' and 'androidTestImplementation', in app/build.gradle.

To fix the error of Failed to resolve: com.android.support:appcompat-v7:28.0.0 and com.android.support.constraint:constraint-layout:1.1.3, I add the follow lines of Google Maven repository to build.gradle.

        maven {
            url 'https://maven.google.com/'
            name 'Google'
        }

And rebuild the project. At least it works for me now.

---

So, how to know the latest version of com.android.support:appcompat-v7 and com.android.support.constraint:constraint-layout?

For Support Library, you can check here: Android Developers > Platform > Libraries > Recent Support Library Revisions

28.0.0 is the recentest stable release of Support Library released on September 21, 2018 and will be the last feature release under the android.support packaging.

For ConstraintLayout, Google announced at https://androidstudio.googleblog.com/2018/08/constraintlayout-113.html.

You can also check from Maven repository:
>> com.android.support >> appcompat-v7
>> com.android.support.constraint >> constraint-layout