This means you can leverage a large collection of native code libraries available online. There are two ways to do this. The first and easiest is the automatic installation option in the SDK Tools tab.

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7. Configure CMake.

Download the appropriate NDK package for your platform and follow the installation instructions. You can put the extracted package anywhere you want, but remember this location as you will need it later. This collection of samples has better compatibility with the latest version of Android Studio. Select Import an Android code sample and type hello in the search box to filter the list.

Click Next to edit the app name and project location, then click Finish. The JNI provides a two-way interface.

Android NDK example

Native code is governed by the same sandbox and security rules as Java code so the app will not have full unrestricted access to hardware. When the app interacts with native code, it must support different CPU architectures.

This means it must be compiled for each platform you want it to run on. Normally the project needs to be setup manually and the native code built for each platform. This is already taken care of in the sample project so just reuse the sample and set it as a starting point for a project. It has all the basic requirements already in place to enable an app to interface with the NDK. This feature is at the experimental stage in Android Studio and generally recommended for advanced developers.

Because CMake includes system libraries in the search path by default, you only need to specify the name of the public NDK library you want to add. CMake verifies that the library exists before completing its build. You can link multiple libraries, such as libraries you define in this build script, prebuilt third-party libraries, or system libraries. Bitmap; import android. BitmapDrawable; import android. AppCompatActivity; import android. Bundle; import android.

View; import android. Button; import android. So, you can also create a pointer to pointer. To work with jobject you have to create Local, Weak or Global reference to it. Local references are valid for the duration of a native method call. They are freed automatically after the native method returns. Each local reference costs some amount of Java Virtual Machine resource. Programmers need to make sure that native methods do not excessively allocate local references. Although local references are automatically freed after the native method returns to Java, excessive allocation of local references may cause the VM to run out of memory during the execution of a native method.

Weak global references are a special kind of global reference. Unlike normal global references, a weak global reference allows the underlying Java object to be garbage collected. Weak global references may be used in any situation where global or local references are used. When the garbage collector runs, it frees the underlying object if the object is only referred to by weak references.

A weak global reference pointing to a freed object is functionally equivalent to NULL. Programmers can detect whether a weak global reference points to a freed object by using IsSameObject to compare the weak reference against NULL.

Global references allow native code to promote a local reference into a form usable by native code in any thread attached to the JVM. References of this type are not automatically deleted, so the programmer must handle the memory management. Every global reference establishes a root for the referent and makes its entire subtree reachable. Therefore, every global reference created must be freed to prevent memory leaks.

I decided to create the sample project that contains a simple in-memory storage written in native language.

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To encapsulate all native functions I created Store class. All this methods have appropriate native functions in Store. You can load native code from shared libraries with the standard System. You can use it to initialize some variable. Our CMakeLists. Please note that in Kotlin we use init block of companion object instead of static block and external keyword instead of native. If you try to get some non-existent value from Store, it will throw an appropriate Exception. They may be moved during their life me.

Regardless, it would be a bad idea to mess with a Java object representation in the memory. The same is true for instances of IBinder. You can find out the tests to better understand several nuances. We found out a lot of theoretical material and based on it created the sample project. We converted Java Strings inside the native code, passed Kotlin objects to the native code, called functions and threw Exceptions of Java.

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