Pro Android C++ with the NDK

By Onur Cinar

Android is among the significant gamers within the cellphone industry. Android is a cellular platform that's outfitted at the most sensible of Linux working process. The native-code help on Android deals never-ending possibilities to software builders, now not constrained the performance that's supplied via Android framework. Pro Android C++ with the NDK is a complicated instructional reference for trendy extra subtle app builders now porting, constructing or making use of C++ and different local code to integrate into the Android platform to run refined local apps and higher acting apps usually. utilizing a online game app case examine, this ebook explores instruments for troubleshooting, debugging, studying reminiscence concerns, unit trying out, unit attempt code assurance, functionality size, on local purposes, in addition to integrating  the Android NDK toolchain into current Autoconf, Makefile, CMake, or JAM established construct platforms. Pro Android C++ with the NDK also covers the subsequent:


  • The Android platform, and getting on top of things with the Android NDK, and exploring the APIs which are supplied in local house.
  • An assessment of Java local Interface (JNI), and auto-generating JNI code via Simplified Wrapper and Interface Generator (SWIG).
  • An advent to Bionic API, local networking. local multithreading, and the C++ common Template Library (STL) help.
  • Native pics and sound utilizing JNI portraits, OpenGL ES, and OpenSL ES.
  • Debugging and troubleshooting local purposes utilizing Logging, GNU Debugger (GDB), Eclipse Debugger, Valgrind, strace, and different instruments.
  • Profiling local code utilizing GProf to spot functionality bottlenecks, and NEON/SIMD optimization from a complicated standpoint, with counsel and proposals.

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Directory 3-25. Getting a Static box jstring staticField; staticField = (*env)->GetStaticObjectField(env, clazz, staticFieldId); In case of a reminiscence overflow, either one of those capabilities can go back NULL, and the local code are not proceed to execute. Tip  Getting the worth of a unmarried box takes or 3 JNI functionality calls. local code attaining again to Java to acquire values of every person box provides additional overhead to the applying and results in poorer functionality. it's endorsed to cross all wanted parameters to local technique calls rather than having the local code achieve again to Java. Calling equipment As with fields, there are different types of tools in Java: example equipment and static tools. The JNI presents features to entry either varieties. directory 3-26 indicates a Java type that comprises one static procedure and one example procedure. bankruptcy three: speaking with local Code utilizing JNI eighty three directory 3-26. Java category with either example and Static equipment public classification JavaClass { /** * example process. */ deepest String instanceMethod() { go back "Instance Method"; } /** * Static process. */ deepest static String staticMethod() { go back "Static Method"; }   ... } Getting the strategy identity The JNI offers entry to either forms of tools via technique IDs. you could receive strategy IDs during the category item for the given example. Use the GetMethodID functionality to procure the tactic identification of an example technique, as proven in directory 3-27. directory 3-27. Getting the tactic identification of an example procedure jmethodID instanceMethodId; instanceMethodId = (*env)->GetMethodID(env, clazz, "instanceMethod", "()Ljava/lang/String;"); Use the GetStaticMethodID functionality to get the strategy identification of a static box, as proven in directory 3-28. either features go back the tactic identification as a jmethodID variety. directory 3-28. Getting the strategy identity of a Static process jmethodID staticMethodId; staticMethodId = (*env)->GetStaticMethodID(env, clazz, "staticMethod", "()Ljava/lang/String;"); just like the box identification getter tools, the final parameter of either capabilities takes the tactic descriptor. It represents the strategy signature in Java. Tip  the tactic IDs should be cached so as to increase software functionality. regularly cache the main usually used procedure ids. eighty four bankruptcy three: speaking with local Code utilizing JNI Calling the tactic utilizing the tactic identity, you could name the particular procedure in the course of the CallMethod functionality for example tools, as proven in directory 3-29. directory 3-29. Calling an example procedure jstring instanceMethodResult; instanceMethodResult = (*env)->CallStringMethod(env, example, instanceMethodId); Use the CallStaticField functionality for static tools, as proven in directory 3-30. clazz, staticMethodId); NULL and the local code may still Tip  Transitions among Java and local code is a expensive operation. it is suggested that you are taking this into consideration whilst finding out to separate among Java and local code. Minimizing those transitions can profit the applying functionality significantly. box and technique Descriptors As pointed out within the prior sections, getting either the sector identification and the tactic identification calls for the sector and strategy descriptors.

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