android NDK call simple java call C++ code

TestNdk1
........\.classpath
........\.externalToolBuilders
........\.....................\NDK_Builder.launch
........\.project
........\.settings
........\.........\org.eclipse.jdt.core.prefs
........\AndroidManifest.xml
........\assets
........\bin
........\...\TestNdk1.apk
........\...\classes
........\...\.......\com
........\...\.......\...\example
........\...\.......\...\.......\hellojni
........\...\.......\...\.......\........\BuildConfig.class
........\...\.......\...\.......\........\HelloJni.class
........\...\.......\...\.......\........\R$attr.class
........\...\.......\...\.......\........\R$drawable.class
........\...\.......\...\.......\........\R$layout.class
........\...\.......\...\.......\........\R$string.class
........\...\.......\...\.......\........\R.class
........\...\classes.dex
........\...\jarlist.cache
........\...\res
........\...\...\drawable-hdpi
........\...\...\.............\ic_launcher.png
........\...\...\drawable-ldpi
........\...\...\.............\ic_launcher.png
........\...\...\drawable-mdpi
........\...\...\.............\ic_launcher.png
........\...\...\drawable-xhdpi
........\...\...\..............\ic_launcher.png
........\...\resources.ap_
........\gen
........\...\com
........\...\...\example
........\...\...\.......\hellojni
........\...\...\.......\........\BuildConfig.java
........\...\...\.......\........\R.java
........\jni
........\...\Android.mk
........\...\hello-jni.c
........\libs
........\....\armeabi
........\....\.......\libhello-jni.so
........\obj
........\...\local
........\...\.....\armeabi
........\...\.....\.......\libhello-jni.so
........\...\.....\.......\libhello-jnit.so
........\...\.....\.......\objs
........\...\.....\.......\....\hello-jni
........\...\.....\.......\....\.........\hello-jni.o
........\...\.....\.......\....\.........\hello-jni.o.d
........\...\.....\.......\....\hello-jnit
........\...\.....\.......\....\..........\hello-jni.o
........\...\.....\.......\....\..........\hello-jni.o.d
........\proguard-project.txt
........\project.properties
........\res
........\...\drawable-hdpi
........\...\.............\ic_launcher.png
........\...\drawable-ldpi
........\...\.............\ic_launcher.png
........\...\drawable-mdpi
........\...\.............\ic_launcher.png
........\...\drawable-xhdpi
........\...\..............\ic_launcher.png
........\...\layout
........\...\......\main.xml
........\...\values
........\...\......\strings.xml
........\src
........\...\com
........\...\...\example
........\...\...\.......\hellojni
........\...\...\.......\........\HelloJni.java

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