Grokking Android

Getting Down to the Nitty Gritty of Android Development

SQLite in Android

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SQLite is at the heart of Android’s database support. This database was developed with embedded environments in mind – and is used not only by Android but also by Apple’s iOS and Blackberry’s system as well as lots of other systems with low memory footprint and comparatively little CPU horsepower. Why SQLite in the first […]  Continue Reading  “SQLite in Android”

Two Days at the moosecon Conference

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This year the German IT trade show CeBIT tried something new: A conference for mobile developers, called moosecon (mobile operating system conference). The conference lasted three days, of which I was present at two, Wednesday and Thursday. Here’s a short recap of the talks, I visited. Wednesday – March 6, 2013 / day one Thanks […]  Continue Reading  “Two Days at the moosecon Conference”

Adding ActionViews to Your ActionBar

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As you have seen in the previous tutorials about ActionBarSherlock and the ActionBar, you can add action items easily and they show up either in the ActionBar itself or in the overflow menu. But so far all you could add were normal action items. And those consisted either of icons, of text or of a […]  Continue Reading  “Adding ActionViews to Your ActionBar”

Adding ActionBar Items From Within Your Fragments

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This tutorial shows you how to add action items to the ActionBar from within your Fragments and how to disable or enable action items depending on the state of your fragment. All code works with the stock Android ActionBar object as well as with ActionBarSherlock. Why do you want to add action items? In a […]  Continue Reading  “Adding ActionBar Items From Within Your Fragments”

ActionBarSherlock: Up Navigation

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In this tutorial I am going to cover some initial thoughts on navigation. The ActionBar allows multiple navigation modes. In this post I state which navigation modes exist, how to get to the ActionBar object in the first place and how to deal with the so-called up navigation. Less code than in the previous parts […]  Continue Reading  “ActionBarSherlock: Up Navigation”

Adding ActionBarSherlock to Your Project

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In my last post I had a look at how to set up a Fragment project that uses a master detail view. This week I am going to show you the necessary steps to make this project use the ActionBarSherlock library. ActionBarSherlock is a library by Jake Wharton, that enables you to use action bars […]  Continue Reading  “Adding ActionBarSherlock to Your Project”

Getting Started With Fragments and the Support Library

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Fragments are modular building blocks for creating a responsive Android UI. They help you to target different devices and screen sizes while at the same time avoiding code duplication. This post starts with the Android Developers Tools generating a project for you. I then explain some of the generated code and will show you how […]  Continue Reading  “Getting Started With Fragments and the Support Library”

Android: How to Use Two Data Sources in ListViews?

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Sometimes in our apps we have the need to link to data of other sources. You have a database of your own for your app, but some records also point to the MediaStore content provider to calendar entries or to contacts. For all detail pages this is not much of a problem. You get the […]  Continue Reading  “Android: How to Use Two Data Sources in ListViews?”

Use Android’s ContentObserver in Your Code to Listen to Data Changes

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When you are using a content provider as a client, chances are that you want to know whenever the data changes. That’s what Android’s class ContentObserver is for. To use the ContentObserver you have to take two steps: Implement a subclass of ContentObserver Register your content observer to listen for changes Implement a subclass of […]  Continue Reading  “Use Android’s ContentObserver in Your Code to Listen to Data Changes”

What You Need to Know About the Intents of Android’s Calendar App

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When your app needs to access calendar data you have to choose whether to use the CalendarContract content provider or whether to use Intents to start specific Activities of the Calendar app. This post covers the intents offered by the official Calendar app. While with using Intents your possibilities are limited compared to those of […]  Continue Reading  “What You Need to Know About the Intents of Android’s Calendar App”