Failed to load AppCompat ActionBar with unknown error in android studio

Question

Below is my xml file  In preview there is two error Failed to load AppCompat ActionBar with unknown error   amp   Failed to instaniate more than one class   How ever am able to run the app But the app crashes and in Logcat no errors are shown    This is my preview screen shot   lt  xml version  1 0  encoding  utf-8   gt   lt android support v4 widget DrawerLayout xmlns android  http   schemas android com apk res android      xmlns app  http   schemas android com apk res-auto      xmlns tools  http   schemas android com tools      android id    id drawer layout      android layout width  match parent      android layout height  match parent      android fitsSystemWindows  true      tools openDrawer  start  gt         lt include         layout   layout app bar main          android layout width  match parent          android layout height  506dp    gt        lt LinearLayout         android id    id layout main          android orientation  vertical          xmlns android  http   schemas android com apk res android          xmlns app  http   schemas android com apk res-auto          xmlns tools  http   schemas android com tools          android layout width  match parent          android layout height  match parent          android weightSum  1          tools context   Activity MainActivity  gt         lt LinearLayout         android id    id main layout          android orientation  vertical          xmlns android  http   schemas android com apk res android          xmlns app  http   schemas android com apk res-auto          xmlns tools  http   schemas android com tools          android layout width  match parent          android layout height  match parent          android layout weight  0 7          tools context   Activity MainActivity  gt            lt  -- our tablayout to display tabs  -- gt           lt android support design widget TabLayout             android id    id tabLayout              android layout width  match parent              android layout height  wrap content              android layout marginTop  50dp              app tabMode  scrollable              app tabSelectedTextColor   color colorBlack              app tabTextColor   color colorWhite              android background   color colorOran              android minHeight   attr actionBarSize                gt            lt  -- View pager to swipe views -- gt           lt android support v4 view ViewPager             android id    id pager              android layout width  match parent              android layout height  match parent   gt        lt  LinearLayout gt            lt LinearLayout             android id    id ll              android layout width  match parent              android layout height  64dp              android layout alignParentBottom  true              android background   ffffff              android orientation  horizontal              android layout weight  0 3              android weightSum  4              tools layout editor absoluteX  8dp              android layout marginBottom  8dp              android layout alignParentLeft  true              android layout alignParentStart  true  gt                lt ImageView                 android id    id btn home                  android layout width  wrap content                  android layout height  match parent                  android layout weight  1                  android src   drawable ta home icon                  android background   color colorOran                  android layout marginRight  1dp                  android scaleType  fitCenter   gt                lt ImageView                 android id    id btn new                  android layout width  wrap content                  android layout height  match parent                  android layout weight  1                  android src   drawable ta todaydeals icon                  android background   color colorOran                  android layout marginRight  1dp                  android scaleType  fitCenter   gt                lt ImageView                 android id    id btn fav                  android layout width  wrap content                  android layout height  match parent                  android layout weight  1                  android src   drawable ta fav icon                  android background   color colorOran                  android layout marginRight  1dp                  android scaleType  fitCenter   gt                lt ImageView                 android id    id btn auth                  android layout width  wrap content                  android layout height  match parent                  android layout weight  1                  android src   drawable ta franchie icon                  android background   color colorOran                  android scaleType  fitCenter                  android layout marginRight  1dp                    gt            lt  LinearLayout gt        lt  LinearLayout gt         lt android support design widget NavigationView         android id    id nav view          android layout width  wrap content          android layout height  match parent          android layout gravity  start          android fitsSystemWindows  true          app headerLayout   layout nav header main          app menu   menu activity main drawer    gt     lt  android support v4 widget DrawerLayout gt    Below is appbar main   lt  xml version  1 0  encoding  utf-8   gt   lt android support design widget CoordinatorLayout xmlns android  http   schemas android com apk res android      xmlns app  http   schemas android com apk res-auto      xmlns tools  http   schemas android com tools      android layout width  match parent      android layout height  match parent      tools context  com jeyashri kitchen jeyashriskitchen Activity MainActivity  gt        lt android support design widget AppBarLayout         android layout width  match parent          android layout height  wrap content          android theme   style AppTheme AppBarOverlay  gt             lt android support v7 widget Toolbar             android id    id toolbar              android layout width  match parent              android layout height   attr actionBarSize              android background   color colorOran              app popupTheme   style AppTheme PopupOverlay  gt                lt ImageView                 android id    id app logo                  android layout width  80dp                  android layout height  match parent                  android src   drawable img   gt                lt ImageView                 android id    id btn social                  android layout width  75dp                  android layout height  35dp                  android layout marginRight  1dp                  android src   drawable share icon    gt        lt  android support v7 widget Toolbar gt        lt  android support design widget AppBarLayout gt        lt include layout   layout content main    gt     lt  android support design widget CoordinatorLayout gt

User · Answer

Replace implementation  com android support appcompat-v7 28 0 0-beta01  with  implementation  com android support appcompat-v7 28 0 0-alpha1     in build gradle  Module app    It fixed my red mark in Android Studio 3 1 3

User · Answer

The solution to this problem depends on the version of the Android support library you re using   Support library 26 0 0-beta2  This android support library version has a bug causing the mentioned problem  In your Gradle build file use   compile  com android support appcompat-v7 26 0 0    with   buildToolsVersion  26 0 0     and  classpath  com android tools build gradle 3 0 0-alpha8    everything should work fine now     Library version 28  beta   These new versions seem to suffer from similar difficulties again   In your res values styles xml modify the AppTheme style from   lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt    to   lt style name  AppTheme  parent  Base Theme AppCompat Light DarkActionBar  gt     note the added Base    Or alternatively downgrade the library until the problem is fixed   implementation  com android support appcompat-v7 28 0 0-alpha1

User · Answer

I also had this problem with    implementation  com android support appcompat-v7 28 0 0-alpha3    The solution for me was to go File -  Invalidate Caches   Restart -  Invalidate -  Close Project -  Remove project from project window -  Open Project  from project window

User · Answer

in android 3 0 0 canary 6 you must change all 2 6 0 beta2 to beta1  appcompat design supportvector

User · Answer

Try this   Just change   compile  com android support appcompat-v7 26 0 0-beta2    to   compile  com android support appcompat-v7 26 0 0-beta1    Reference

User · Answer

I was also facing the same problem  Nothing like changing theme from Layout preview window helped me   What helped me was adding this to Apptheme in styles xml   dependencies       implementation  com android support appcompat-v7 27 0 2      implementation  com android support design 27 0 2      Still it was giving me the error   cannot resolve symbol widget   coordinatorLayout   Then I updated my build gradle app  with   dependencies       implementation  com android support appcompat-v7 27 0 2      implementation  com android support design 27 0 2      One more thing   compileSdkVersion 27 targetSdkVersion 27

User · Answer

Use this one   implementation  com android support appcompat-v7 26 0 0-beta1  implementation  com android support design 26 0 0-beta1    instead of   implementation  com android support appcompat-v7 26 0 0-beta2  implementation  com android support design 26 0 0-beta2    In my case it removed the rendering problem

User · Answer

This is Worked for me i have made the following changes in Style xml  Change the Following Code    lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt    With    lt style name  AppTheme  parent  Base Theme AppCompat Light DarkActionBar  gt

User · Answer

found it on this site  it works on me    Modify  res values styles xml from    lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt   lt  style gt    to    lt style name  AppTheme  parent  Base Theme AppCompat Light DarkActionBar  gt   lt  style gt

User · Answer

Open preview mode   follow the below link to fix the issue   Fix - Rendering Problems The Following classes could not be found   android support v7 internal   goto appTheme ----   select Holo Theme ---  refresh   https   www youtube com watch v 4MxBnwpcUjA

User · Answer

Method 1   Locate  res values styles xml  Change   lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt    To   lt style name  AppTheme  parent  Base Theme AppCompat Light DarkActionBar  gt    Method 2   Modify template file locate  android-studio plugins android lib templates gradle-projects NewAndroidModule root res values styles xml ftl   Change  backwardsCompatibility true gt Theme AppCompat lt  else gt  lt  if   To   backwardsCompatibility true gt Base Theme AppCompat lt  else gt  lt  if   Watch Solution On YouTube

User · Answer

June 2018 Issue fixed by using a different appcompact version  Use these codes onto your project dependencies     In build gradle Module  app  add this dependency  implementation  com android support appcompat-v7 28 0 0-alpha1    Happy Coding

User · Answer

This is the minimum configuration that solves the problem   use   dependencies               implementation  com android support appcompat-v7 26 1 0              with    compileSdkVersion 26  buildToolsVersion  26 0 1    and into the build gradle file located inside the root of the proyect   buildscript                        dependencies           classpath  com android tools build gradle 3 0 1

User · Answer

Faced the same problem in Android Studio 3 1 3  Just go to style xml file  and replace Theme name     lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt    with    lt style name  AppTheme  parent  Base Theme AppCompat Light DarkActionBar  gt    Then clean and rebuild the project This will solve the error

User · Answer

I also had  this  problem and  it s  solved  as  change  line  from res values styles xml   lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt    to     lt style name  AppTheme  parent  Theme AppCompat Light NoActionBar  gt   lt style name  AppTheme  parent  Base Theme AppCompat Light DarkActionBar  gt    both  solutions  worked

[android] Failed to load AppCompat ActionBar with unknown error in android studio

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