Android using theme for your UI development


We're gonna define theme to use in our app. This means we do not have to manually 'write up' a bunch of "style=" attribute and assigned a custom value to it.

The only major code change we need to do is in our manifest.xml as shown below :-


Declaring theme in manifest 

Here we are assigning a theme called AppTheme/NoActionBar (ok maybe its not a good name)





Default Styling of UI Component in style.xml

Here we have two customer style which we would like to apply to our controls. These are call Widget.TextView.Custom and Widget.Spinner.Customer respectively.



   

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If you're getting  exception when trying to assigned key to a symmetric key and getting error message below :- The specified initialization vector (IV) does not match the block size for this algorithm And your code probably look like something below :- Then you need to go into debug mode and start looking into the supported size for IV as shown in diagram below :- As you can see, IV is 16 bytes, so you need to provide 16 bytes. The same goes for Key field too, if you're adding anything to it. As long as you provide a valid key size, then we're good and you're code will be ready.
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