By Erik Hellman
Should you already understand your method round the Android OS and will construct an easy Android app in lower than an hour, this booklet is for you. If you’re itching to determine simply how a long way you could push it and observe what Android is actually able to, it’s for you. And if you’re able to how one can construct complicated, intuitive, leading edge apps which are a blast to exploit, this publication is well for you. From customized perspectives and complicated multi-touch gestures, to integrating on-line net companies and exploiting the newest geofencing and task reputation beneficial properties, ace Android developer, Erik Hellman, grants professional suggestions, tips and little-known concepts for pushing the Android envelope so that you can: Optimize your elements for the smoothest person adventure attainable Create your personal customized perspectives Push the bounds of the Android SDK grasp Android Studio and Gradle Make optimum use of the Android audio, video and pics APIs software in Text-To-Speech and Speech popularity utilize the recent Android maps and site API Use Android connectivity applied sciences to speak with distant units practice historical past processing Use Android cryptography APIs locate and accurately use hidden Android APIs Cloud-enable your functions with Google Play providers Distribute and promote your functions on Google Play shop how you can unharness the facility of Android and rework your apps from reliable to nice in Android Programming: Pushing the bounds.
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Extra info for Android Programming Pushing the Limits
Also, not all of the Java SE APIs are available on Android because they’re irrelevant for this platform. For instance, the Swing/AWT packages have been completely removed because Android uses a different UI framework. Other APIs that have been removed are RMI, CORBA, ImageIO, and JMX. These have either been replaced by an Android specific version (in the android package space) or simply don’t have an equivalent in Android for practical reasons. 36 Part I: Building a Better Foundation Optimizing Java Code for Android Java SE has evolved over the years with new features that simplify writing complicated code structures.
An application that runs fine on your high-end device can become sluggish and even encounter the dreaded Application Not Responding (ANR) message if you’re not careful. The options under Monitoring in the Development Options menu can help you spot these problems early on. By checking Strict Mode Enabled, the screen on your device will flash when you’re performing a long operation on the main thread. Show CPU Usage is useful for tracking how much more the CPU is working when your application is running, which you can use for comparison with other applications on the same device to see if you’re doing better or worse than they are.
Instead of having a flat structure, there are two main source sets: source code and test sources. They are in the following directories: src/main/ src/instrumentTest/ Under the main directory the Java source code is placed in the java and resources are placed in the res directory. xml file is located directly in the main directory (see Figure 1-1). The other directories for project files are assets (for binary assets), aidl (for Android IDLs), rs (RenderScript sources) and jni (native C/C++ code).