Migrating to AndroidX Errors:

Before I was using Android 2.3. After Android X launched. I migrate my project built into Android 2.3 to Android X. Here, I faced certain errors and now I am going to show you how I resolved the following errors.

Error 1:

failed to resolve: com.android.support:design:29.0.2

My Solution:

failed to resolve: com.android.support:design:29.0.2

changed into

implementation 'com.google.android.material:material:1.2.0-alpha04'

Error 2:

failed to resolve: com.android.support:appcompact-v7:29.0.2

My Solution:

com.android.support:appcompact-v7:29.0.2

changed into

implementation 'androidx.appcompat:appcompat:1.1.0'

Error 3:

Android Resource linking failed

No resourece found: app:layout_behavior="@string/appbar_scrolling_view_behavior" 

My Solution:

Solved by restart the android project and clear catches

Error 4:

content_main.xml
Error: The following classes could not be found:

android.support.design.widget.CoordinatorLayout (Fix Build Path, Edit XML, Create Class)

android.support.design.widget.AppBarLayout (Fix Build Path, Edit XML, Create Class)

android.support.design.widget.FloatingActionButton (Fix Build Path, Edit XML, Create Class)

android.support.v7.widget.Toolbar (Fix Build Path, Edit XML, Create Class)The following classes could not be found:

My Solution: Changed into

androidx.coordinatorlayout.widget.CoordinatorLayout

com.google.android.material.appbar.AppBarLayout

com.google.android.material.floatingactionbutton.FloatingActionButton

androidx.appcompat.widget.Toolbar

Error 5:

“cannot resolve symbol in R”

Solution:

Method 1: Open your Android project manifest and changed your android app package name to the new package name.

Method 2: Restart android studio project. File -> Invalidate caches/restart.

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