![]() ![]() For example if was impossible for us to catch a C++ exception and launch a Java exception in JNI. If you have a way to remove them, go for it! Actually, there’s another reason to avoid using C++ exceptions: their support is still far from perfect. For example, the NewStringUTF function in the example is a member of this. Whilst using exceptions and RTTI can help you to use existing code, it will obviously increase your binary size. Android jni/ndk programming two: jni data type conversion (primitive, String. Press the Apply button and you are all set without the need to worry about the options and installations. Switch to SDK Tools and you should see the recommended tools highlighted in Figures 1 and 2. We actually do not use exceptions in our native lib, but for the sake of completeness, I’ll cover this point too.Ĭ++ exceptions and RTTI are disabled by default but you can enable them via APP_CPPFLAGS in your Application.mk file and use a compatible STL, for example: APP_CPPFLAGS += -fexceptions -frtti In Figure 2, it is the SDK Manager started up by Android Studio when you go to its menu under Tools -> Android. To address this problem we managed to reduce Algolia binary size from 850KB to 307KB. AVelov is 638KB and Algolia was 850KB, which would mean that AVelov would more than double in size with Algolia Search embedded. We were reminded of the importance of binary size by Cyril Mottier who informed us that it would be difficult to integrate our lib in AVelov Android Application because its size. Our example contains an integer array so we use the JNI function GetIntArrayElements to obtain this pointer. The reason for the overrun is noted in the exception: B offset12 length1634 src.length1634 Bmeans byte. GetByteArrayElementsjust gets a pointer to the start of the array, so your memcpy()is free to run past the end unnoticed. When we started Algolia Development for Android, binary size optimization was not one of our main concerns. In fact we even started to develop in JAVA before switching to C/C++ for reasons of performance. Next, obtain a pointer to the elements of the array. GetByteArrayRegionchecks the bounds of the array to make sure you're not running over the end. ![]()
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