When migrating a project or switching between branches which are and aren't migrated, Android Studio cannot build projects because it cannot find the android.support.design.widget.Snackbar
package. Support/Design packages are removed but the migration table does not list the correct new package for this component.

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5 Answers
This took a long time to resolve, as until your project successfully builds, autocomplete will not function to lookup packages.
The correct package to use is:
com.google.android.material.snackbar.Snackbar
It is also important to remember to change this on the XML tags as well as the imports if the migration has not worked successfully.

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do I have no other solution than to implement material into my app? – Donki Apr 16 '20 at 07:55
Old build artifact com.android.support:design
now solves in com.google.android.material:material:1.0.0
for AndroidX build artifact.

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1For anyone searching: Currently the lastest stable is "com.google.android.material:material:1.0.0". – Minding Aug 10 '19 at 14:26
Add implementation "com.google.android.material:material:1.1.0"
to your app-level build.gradle
.
Also, ensure that your project is set up to migrate old packages to Androidx by including this in your gradle.properties
file:
android.useAndroidX=true
android.enableJetifier=true

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Import
com.google.android.material.snackbar.Snackbar;
instead of
android.support.design.widget.Snackbar;
if you shifted to androidx and AS couldn't find the package anymore.

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Updating to Anko version 0.10.8 will resolve this, it will tell you that snackbar(view, int) is now deprecated, instead of it you will use view.snackbar(int: Message)

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