error: style attribute 'attr/colorPrimary' not found

Question

Recently I updated my target SDK to 29 as per new Android guidelines but after that I received this error:

D:\Android Apps\PatherPane\app\src\main\res\values\styles.xml:4:5-9:13: AAPT: error: style attribute 'attr/colorPrimary (aka com.patherpane.app:attr/colorPrimary)' not found.

And my style XML file is:

<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <!-- Customize your theme here. -->
    <item name="colorPrimary">@color/colorPrimary</item>
    <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
    <item name="colorAccent">@color/colorAccent</item>
</style>
<style name="SplashScreen" parent="Theme.AppCompat.Light.NoActionBar">
    <item name="android:windowBackground">
        @drawable/background_splashscreen
    </item>
</style>

How can I fix this?

This command followed by item names is showing the error: Theme.AppCompat.Light.DarkActionBar

Answer 1

Make sure you have not missed appcompat implementation in build.gradle(app)

implementation ‘com.android.support:appcompat-v7:28.0.0’

or

implementation 'androidx.appcompat:appcompat:1.2.0'

if using androidx

Answer 2

This error commonly shows up when

androidx.appcompat:appcompat

and

com.google.android.material:material

versions do not match. Check whether you updated one and not the other

Answer 3

Had this in a library module, which suddenly stopped resolving the theme.

dependencies {
    implementation "com.google.android.material:material:1.3.0"
}

Answer 4

Go to app/src/main/res/values/colors.xml It should look something like this:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="colorPrimary">#008577</color>  //This is where the colorPrimary is defined
    <color name="colorPrimaryDark">#00574B</color>
    <color name="colorAccent">#D81B60</color>
</resources>

Make sure that the line that I commented exists, has correct syntax, and defines the appropriate 6-digit hexcode in the middle. The hexcode should be the primary color of the theme you are designing.