android – How to change app default theme to a different app theme?-ThrowExceptions

Exception or error:

I have an Android app that has a default theme of Holo.Light but I want to change it to Theme.Black.I tried to do this by changing the style tag in the manifest android:theme="@style/AppTheme" to Theme.Black but it cannot be found.Is there extra steps I have to take in changing the theme?

How to solve:

Actually you should define your styles in res/values/styles.xml. I guess now you’ve got the following configuration:

<style name="AppBaseTheme" parent="android:Theme.Holo.Light"/>
<style name="AppTheme" parent="AppBaseTheme"/>

so if you want to use Theme.Black then change AppBaseTheme parent to android:Theme.Black or you could change app style directly in manifest file like this – android:theme="@android:style/Theme.Black". You must be lacking android namespace before style tag.

You can read more about styles and themes here.

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To change your application to a different built-in theme, just add this line under application tag in your app’s manifest.xml file.

Example:

<application 
    android:theme="@android:style/Theme.Holo"/>

<application 
    android:theme="@android:style/Theme.Holo.Light"/>

<application 
    android:theme="@android:style/Theme.Black"/>

<application 
    android:theme="@android:style/Theme.DeviceDefault"/>

If you set style to DeviceDefault it will require min SDK version 14, but if you won’t add a style, it will set to the device default anyway.

<uses-sdk
    android:minSdkVersion="14"/>

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If you are trying to reference an android style, you need to put “android:” in there

android:theme="@android:style/Theme.Black"

If that doesn’t solve it, you may need to edit your question with the full manifest file, so we can see more details

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Or try to check your mainActivity.xml you make sure that this one
xmlns:app="http://schemas.android.com/apk/res-auto"hereis included

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