Monday, January 18, 2010

Strikethrough Android

There are a lot of people working on mobile applications these days. Some of them are experienced mobile developers. Maybe they were doing J2ME or Brew apps in the past, and now they are probably happy to be doing iPhone or Android development. However, I would wager that a majority of current iPhone and Android developers were not doing mobile a few years ago. Maybe they were doing desktop development, or maybe they were doing web development. For these folks, it can be very surprising how tricky it is to do some (seemingly) simple things. Case in point, strikethrough text.

If you ever need to do this in Android, here is how you do it, or at least a relatively simple way I found to do it. If you just search the Android documentation, you will find this reference page. As you can see for static text, it really is quite simple. It is very similar to doing it in HTML.
    <string id="@+id/strike_one"><strike>Strike one!</strike></string>
Nice! Android rocks! But what if your text is dynamic? Well if you keep reading the documentation referenced above, you get into the world of Spannable. This sounds good at first, because it sounds like it's again inspired from HTML. If you look at the sample, it is not so simple. Still, it's not too hard, maybe just a little awkward. But wait, there's more. The class most commonly used for text, TextView, is not a Spannable. Instead, you must use an EditText, which is a subclass of TextView. This is a class that you would not normally use for normal text on the screen, instead you would use it for a text input field.
Turns out there is an easy way to strikethrough a TextView after all. Well easy, if you don't mind use some bit twiddling:
TextView someLabel = (TextView) findViewById(;
someLabel.setPaintFlags(someLabel.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
What is going on here? For painting text, there are several bit flags for doing things like bold, italics, and yes strikethrough. So to enable the strikethrough, you need to flip the bit that corresponds to this flag. The easiest way to do this is to use a bitwise-or on the current flags and a constant that corresponds to a set of flags with only the strikethrough flag enabled. For any other bit flags that are already set, this will have no effect. Actually if the strikethrough flag happened to be already set, this will have no effect. However, if it is not set, then it will flip it, so that it will be set and thus add a nice strikethrough effect.


Unknown said...

This is genius. The Spannable thing must be one of the most annoying parts of Android. Thanks for this tip!

Anonymous said...

Thanks for sharing. Really helpful!

Anonymous said...

Good one..thanks..

Anonymous said...

One year old but still useful, thanks a lot !

Carlo said...

Thank you for sharing this!

Android developer said...

Thanks for creating this good information about android, because i got a good knowledge. so you can create more blog with useful information and most of them get benefits from here.

Android app developer said...

This is one of the forward and good post.I like your blog detail.This si one of teh knowledgeable post.

Strikethrough Text said...

Very useful article. This is full of information I can't wait to dig deep and start utilising the useful resource given by you. This is probably the best blog I came across today. I Just want to add that if anyone want to Learn how to Strikethrough Text in Word, Excel and PowerPoint and see the other advanced text settings available then nuts and bolts speed training is best choice for them.

periyannan said...

Good Post! Thank you so much for sharing this pretty post, it was so good to read and useful to improve my knowledge as updated one, keep blogging.

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