Failed to load AppCompat ActionBar with unknown error?

Question

build.gradle file

    apply plugin: 'com.android.application'

android {
    compileSdkVersion 28
    defaultConfig {
        applicationId "io.dume.dume"
        minSdkVersion 15
        targetSdkVersion 28
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    implementation fileTree(dir: 'libs', include: ['*.jar'])
    implementation 'com.android.support:appcompat-v7:28.0.0-alpha3'
    implementation 'com.android.support.constraint:constraint-layout:1.1.2'
    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'
 }

I just created a new projects and found this error dramatically on activity_main.xml i did not changed anything . Is there any Fix?

May be duplicate of this :https://stackoverflow.com/a/44858887/9050003 — mahmoud zaher, Nov 07 '18 at 13:41

score 21 · Answer 1 · answered Jun 17 '18 at 19:08

21

I had the same problem. Seems it is a Android Studio bug.

In your styles xml-file change this:

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

to this:

<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">

Works for me.

answered Jun 17 '18 at 19:08

Anton Prokopov

639
6
27

2

downgrading compact version 28alpha to 27 worked for me – That's Enam Jun 18 '18 at 08:31

score 3 · Answer 2 · answered Aug 05 '18 at 04:02

3

Set your target sdk version to 27 . Set your compile sdk version to 27 . And app compat version from 28.0.0-alpha3 to 27.1.1 .

If you still want to use sdk version 28

Just replace alpha3 to alpha1 without changing anything else

answered Aug 05 '18 at 04:02

Jaswant Singh

9,900
8
29
50

score 1 · Answer 3 · answered Sep 19 '18 at 18:56

This worked for me when that happened, I dont know why it doesn't work with 28:

//use this instead 
compileSdkVersion 27
buildToolsVersion '27.0.3'
targetSdkVersion 27

dependencies{

//switch to these
implementation 'com.android.support:appcompat-v7:27.0.0-alpha'
implementation 'com.android.support.constraint:constraint-layout:1.0.2'
implementation 'com.android.support:design:27.0.0'

}

score 0 · Answer 4 · answered Aug 05 '18 at 03:57

0

I fix this error using 3 methods on YouTube

answered Aug 05 '18 at 03:57

duyuanchao

3,863
1
25
16

score -1 · Answer 5 · answered Nov 21 '18 at 00:03

This worked for me.

Open, res --> values --> styles.xml, here you will find a line like this:

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">

change it to:

<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">

In otherwords, change DarkActionBar to NoActionBar

Failed to load AppCompat ActionBar with unknown error?

5 Answers5

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