What is the NDK and how can I use JNI? [closed]

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hi give me simple explanation for ndk and jni i am not clear this topic explain what is the main purpose....i am fresher for android application help me....

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NDK = Native Development Kit http://developer.android.com/sdk/ndk/overview.html

Basically: you can use parts C or C++ for your android develpment.

It's really hard to give a more basic explanation than this quote (from above link, with annotations in-between by me):

Android applications run in the Dalvik virtual machine.

Meaning: the Android variety of the Java Virtual machine (yes, that's a bit of a shortcut, but gimme a break :) ) So normally you're making your code in JAVA, for this virtual machine.

The NDK allows you to implement parts of your applications using native-code languages such as C and C++.

Now sometimes you have parts code (you might have developed earlier for another platform) that you want to re-use. And they're NOT in JAVA. Then you can use the NDK to incorporate them in your APK.

The NDK provides:

• A set of tools and build files used to generate native code libraries from C and C++ sources

So you get tools to use your 'old' C/C++ sources as a base, and create libraries for you android app.

• A way to embed the corresponding native libraries into an application package file (.apk) that can be deployed on Android devices

Now you need more then just libraries. You also get a method to actually use them.