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Diagnosing Layout Problems
Yesterday, a post came over the transom on the [android-developers] Google Group, citing a problem in getting a RelativeLayout to work properly as a row in a ListView. Since I screwed up my initial response to that post, I figured I’d document and write up …
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0.9 SDK Tips #1: The Hidden Changes
This is the first in a series of blog posts to help those of you with M5 applications make the jump to the 0.9 SDK. Also, if you see a tutorial dated before mid-August, that tutorial is from M5, and so these blog posts may …
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Fun with Fonts
Inevitably, you’ll get the question “hey, can we change this font?” when doing application development. The answer depends on what fonts come with the platform, whether you can add other fonts, and how to apply them to the widget or whatever needs the font change. …
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Flipping Your Views
Let’s face it: phones are small. Even if you have a phone with excellent screen resolution, the physical screen size is still rarely over 3″x5″, since most people want phones that can fit in a pocket, purse, pouch, or poncho. This means your Android activities …
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Scripting Your Android Device
One of the issues that arose when Apple released the iPhone SDK earlier this year was the restriction on language interpreters: No interpreted code may be downloaded and used in an Application except for code that is interpreted and run by Apple’s Published APIs and …
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Fancy ListViews, Part Six: Custom Widget
In this, the last and longest of our Fancy ListView posts, we’ll cover what it takes to wrap up the logic from the ChecklistDemo from a previous post and turn it into a reusable CheckListView that can serve as a drop-in replacement for ListView. Before …
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Fancy ListViews, Part Four
In our last episode, we took a closer look at the ViewHolder/ViewWrapper pattern for making ListViews that much more efficient to render. Today, we switch gears, and take a look at having interactive elements in ListView rows. Specifically, we’ll look at a crude implementation of …
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Fancy ListViews, Part Three
In our last episode, we saw how we could save processing time — and, hence, battery life — by recycling existing row views in our fancy lists, simply by checking and reusing the convertView parameter passed into our getView(). In his comment to this series’ …
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Fancy ListViews, Part Two
In our last episode, we saw how to create Android ListViews that contain more than just a simple list of strings. In particular, we saw the ultimate form of customization: subclassing an Adapter class, overriding getView(), and returning our own View for each row, perhaps …
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Fancy ListViews, Part One
The classic Android ListView is a plain list of text — solid but uninspiring. This is the first in a series of posts where we will see how to create a ListView with a bit more pizazz. Today, in particular, we will see two techniques …
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Inflation is a Good Thing
Before diving into the topic of creating fancy lists in Android, we need to take a short detour into some background material. If you have written activities for Android, you are used to calling setContentView() with the resource ID of some XML layout you specified. …
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Gettin’ On The (Message) Bus, Part Two
In our last episode, we discussed how the Android Intent systems functions, in effect, like a message bus, and how one can set up an IntentReceiver to serve as a consumer of bus messages. Today, let’s complete the picture, creating both a message consumer and …
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