Android NDK

Berikut adalah salah satu cara menggunakan Android NDK:

1. Buat program Java.
2. Buat program C/C++.
3. Generate header.
   Contoh:

   javah -o HalloJNI.h -jni -classpath ../src com.example.hallojni.TestJNI

   HalloJNI.h -> File  hasil generate.
   com.example.hallojni.TestJNI -> class TestJNI.java

4. Include header file pada program C/C++;
5. Jalankan program.

Beberapa error yang mungkin ditemui:

01-01 09:56:00.686: E/AndroidRuntime(3229): FATAL EXCEPTION: main
01-01 09:56:00.686: E/AndroidRuntime(3229): java.lang.UnsatisfiedLinkError: getMessage
01-01 09:56:00.686: E/AndroidRuntime(3229):     at com.example.hallojni.TestJNI.getMessage(Native Method)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at com.example.hallojni.MainActivity.onCreate(MainActivity.java:19)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.app.Activity.performCreate(Activity.java:4492)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.os.Handler.dispatchMessage(Handler.java:99)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.os.Looper.loop(Looper.java:137)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at android.app.ActivityThread.main(ActivityThread.java:4424)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at java.lang.reflect.Method.invokeNative(Native Method)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at java.lang.reflect.Method.invoke(Method.java:511)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
01-01 09:56:00.686: E/AndroidRuntime(3229):     at dalvik.system.NativeStart.main(Native Method)

Solusi:

1. Pastikan nama class sama.
2. Pastikan header file sudah di include.