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Android “R cannot be resolved to a variable”
Seeing "R cannot be resolved to a variable," is one of the most annoying and recurring problems when developing in Android. Below are the problems I've run into and their solutions. No problems; everything in working order: Let's start with a working project (picture above). Notice the followi...
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Android Hello World Example
Before starting this tutorial, you should have read, understood, and successfully completed the tutorials listed below. These tutorials are the building blocks for this tutorial and are listed in order from basic building blocks to compound ideas. Installing Eclipse Updating Eclipse Import...
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Android Horizontal GridView Example
Looking for an Android horizontal gridview example? If so, you've landed in the right place because this tutorial demonstrates how to do just this by installing Jess Anders' two-way-gridview library in Eclipse along with my test application that uses the library for a horizontally scrolling gridview...
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Android PDF Library Comparison
Google really dropped the ball when it decided not to provide a native PDF Viewer for Android. After reading a lot on the subject, I understand that Google believed developers would be fine allowing their apps to open another application to view PDFs using the Intent structure. But, while some devel...
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Android Studio Google In App Purchases
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Android Studio Hello World Example
Android Studio Hello World Example
In this Android Studio Hello World Example we demonstrate how to create your very first Android app. The app is super simple and prints "Hello World" to the screen. After showing you how to create app, we explain what each component does so that you can get a better understanding of the file s...
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App Stores for Publishing Android Apps
This is a fairly comprehensive list of App Store where you should publish your Android apps. If one is missing please add it in the comments and I'll add it to the content. Google Play Amazon App Store Baidu App Store Tencent App Gem Xiaomi App Store Huawei App Store Qihoo 360 Mobile...
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Debugging Android Project DDMS Heap Dump in Eclipse
First off, what is a heap dump? A heap dump is essentially a snapshot of an application's data at a given point in time. It maps a specific process, view, etc. to the memory being used. Sort of like ctl-alt-delete on windows in order to determine what's using up your app's memory. To get a heap dum...
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How to add AdMob Banner Ad to Android Studio
One of the ways in which an Android developer can monetize their apps is by displaying in-app ads. The most common type of ads are Banner Ads, Interstitial Ads, In-App Purchase Ads, and Native Ads. These ads can be generated by the developer or an advertising curator like Google AdMob. This guide sp...
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Want to make money with your Android app?

Do you want to learn how to venture beyond coding and profit from your hard work? Then sign up for our newsletter today and get:

  • Bi-weekly money making tips
  • Full access to checklists
  • Gain access to download content