Android Best Practices by Godfrey Nolan

By Godfrey Nolan

Android most sensible Practices by way of Godfrey Nolan indicates you ways to make your Android apps stick out from the gang with greater studies to your apps. Why accept simply making any Android app? construct a super, standout Android app in its place that we could your clients compliment it for ease of use, greater functionality and extra. greater compliment skill greater, greater placement within the app shops for elevated app revenues.

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Figure 3-3. InsertHelper command for inserting large amounts of data or use compileStatement where appropriate. Don’t store the database on the SD Card. Finally, don’t return the entire table of data in a SELECT statement; always return the minimum of rows using carefully crafted SQL statements. ” We’re right back to the web site optimization techniques I mentioned earlier. Use the server logs, as shown in Figure 3-2 earlier, to see how long each call is taking and optimize the slowest, most-used Web services.

Use floats judiciously. Floating-point calculation is expensive, usually taking twice as long as integer calculations on Android devices. Make fewer, more productive, NDK calls. Context switching between Java and C++ using the JNI or NDK can be expensive. There are also no JIT optimizations. But if the app uses some core algorithm or functionality that doesn’t need to be tied to the UI in any significant way, it should probably be run natively. Running things natively is almost always going to be faster than Java even with the JIT compiler.

The asterisk indicates a daemon thread, and the status Native means the thread is executing native code. Looking at the sample data in Figure 3-9, it is clear that an unusual amount of time is spent doing GC. A closer look at how the application is handling object creation might be a good idea for improving performance. Method Profiling Method Profiling is the tool of choice within DDMS for getting a quick overview of where time is really spent in your application and is the first step in homing in on methods that are taking too much time.

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