The Method to use Native Code(C/C++) in Android OS and Its Applications
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In general an Android application based on Java operates on DALVIK virtual machine. It is safe that an application operates on a virtual machine which means it is platform-independent. However, to be operated on a virtual machine, it takes some time for the program codes to be converted. This is slower than an operation of native codes like C because the codes are translated to machine language, which means it is platform-dependent. Also, it is restricted to access a hardware directly on a virtual machine. Many programs have been developed based on C/C++. We might save time and cost for development if we can reuse these programs without re-developing for other programming languages. On this paper, we explain how to operate a code based on C/C++ using JNI (Java Native Interface). Starting with how to call C/C++ native functions from Java classes, we introduce how codes developed with two different programming languages communicate each other. Also, we introduce a specific case using native codes on Android as an example.
Abstract
In general an Android application based on Java operates on DALVIK virtual machine. It is safe that an application operates on a virtual machine which means it is platform-independent. However, to be operated on a virtual machine, it takes some time for the program codes to be converted. This is slower than an operation of native codes like C because the codes are translated to machine language, which means it is platform-dependent. Also, it is restricted to access a hardware directly on a virtual machine. Many programs have been developed based on C/C++. We might save time and cost for development if we can reuse these programs without re-developing for other programming languages. On this paper, we explain how to operate a code based on C/C++ using JNI (Java Native Interface). Starting with how to call C/C++ native functions from Java classes, we introduce how codes developed with two different programming languages communicate each other. Also, we introduce a specific case using native codes on Android as an example.
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