How to change the Theme in Android App

How to change the Theme in Android App

Theme in Android means applying the same style to a single activity or whole application .
Note:

• If you will apply theme to a single activity then the style will appear to that particular activity .
• If you will apply theme to whole application then the style will appear to the whole application.

Now lets us learn how to change the theme in android.

• Now start with a project by selecting new-> file-> Android Application Project.
• Fill the following details in the project.

• Application Name- AndroidTheme
• Project Name -AndroidTheme
• Package Name- theme.android
• Minimum required SDK - 2.2 froyo  and then click next and next then finish.

• Now open your project explorer you will see the following three folder under res folder.

• value - it contain themes and styles for android API 10 and lower version.

• value-v11- it contain themes and styles for Android API 11 to API 13.

• value-v14- it contain themes and styles for Android API 14 and Higher.

• Lets change the theme,Open the values-v14 folder because here i have configured my emulator for android 4.1(API 16)  then open styles.xml
• In styles.xml you will see the following line .here the themeTheme.Holo.Light.DarkActionBar

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

• Now we will change the theme ie. Theme.Holo.Light.NoActionBar so final code will look like this.

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

• Now when you will run this you will see following change.

(Before)Theme.Holo.Light.DarkActionBar

(After)Theme.Holo.Light.NoActionBar

For applying various themes in android visit Available theme in Android