Hallo,
mein Android Studio erkennt ConstraintLayout nicht.
Hier sind meine dependencies und mein SDK Manager:
dependencies { implementation fileTree(dir: 'libs', include: ['*.jar']) implementation 'com.android.support:appcompat-v7:28.0.0' implementation 'com.android.support.constraint:constraint-layout:1.1.3' implementation 'com.google.firebase:firebase-core:16.0.1' implementation 'com.google.firebase:firebase-messaging:17.3.4' implementation 'com.android.support:support-media-compat:28.0.0' 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'}