![]() ![]() A simple bash script with Ant is enough to make it work! HelloJni is the main Activity class name concatenated to the main package.īecause Android SDK, NDK, and their open source bricks are not bound to Eclipse or any specific IDE, creating an automated build chain or setting up a continuous integration server becomes possible. Command parameters passed in step 8 come from the Android manifest: is the package name and. JNI is a standard framework that allows Java code to explicitly call native C/C++ code with a dedicated API.įinally, we have launched HelloJni on our device from an Android shell ( adb shell) with the am Activity Manager command. Both sides of the application, the native and the Java one, communicate through Java Native Interface. This library simply returns a character string to the Java part of the application on request. We have also compiled our first native C library (also called module) using the ndk-build command. We have compiled, packaged, and deployed an official NDK sample application with Ant and SDK command-line tools. Finally, look at your development device.Command parameters come from the Android manifest: Command am allows to start Android activities, services or sending intents (that is, inter-activity messages) from command line. To do so, use am, the Android Activity Manager. From this shell, launch HelloJni application on your device or emulator.ADB shell is similar to shells that can be found on the Linux systems: Launch a shell session using adb (or adb.exe on Windows).The result should look like the following extract: Following is only a partial extract of the output: Among other things, Ant runs javac to compile Java code, AAPT to package the application with its resources, and finally ADB to deploy it on the development device. All these steps can be performed in one command, thanks to Ant build automation tool. Compile, package, and install the final HelloJni APK (an Android application package).Make sure your Android development device or emulator is connected and running.Command ndk-build sets up the compilation toolchain for native C/ C++ code and calls automatically GCC version featured with the NDK. ![]() Build libhello-jni native library with ndk-build, which is a wrapper Bash script around Make.(Move the mouse over the image to enlarge.) These files describe how to compile and package an Android application: Create Ant build file and all related configuration files automatically using android command ( android.bat on Windows). ![]()
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