Android SDK does not include the JNI support but no documentation for instructions on how to support JNI. However, since the entire Android platform is open source, we can through Google released the source code to find some clues (such as the frameworks/base/media/jni/directory) upper JAVA program 依葫芦画瓢 the call through JNI Native C program function.

hello-jni\.checkstyle
.........\.classpath
.........\.externalToolBuilders\.svn\all-wcprops
.........\.....................\....\dir-prop-base
.........\.....................\....\entries
.........\.....................\....\text-base\C_Builder.launch.svn-base
.........\.....................\C_Builder.launch
.........\.project
.........\.svn\all-wcprops
.........\....\dir-prop-base
.........\....\entries
.........\....\text-base\.checkstyle.svn-base
.........\....\.........\.classpath.svn-base
.........\....\.........\.project.svn-base
.........\....\.........\AndroidManifest.xml.svn-base
.........\....\.........\default.properties.svn-base
.........\AndroidManifest.xml
.........\assets\.svn\all-wcprops
.........\......\....\dir-prop-base
.........\......\....\entries
.........\default.properties
.........\gen\.svn\all-wcprops
.........\...\....\dir-prop-base
.........\...\....\entries
.........\...\com\.svn\all-wcprops
.........\...\...\....\dir-prop-base
.........\...\...\....\entries
.........\...\...\example\.svn\all-wcprops
.........\...\...\.......\....\dir-prop-base
.........\...\...\.......\....\entries
.........\...\...\.......\hellojni\.svn\all-wcprops
.........\...\...\.......\........\....\dir-prop-base
.........\...\...\.......\........\....\entries
.........\...\...\.......\........\....\text-base\R.java.svn-base
.........\...\...\.......\........\R.java
.........\jni\.svn\all-wcprops
.........\...\....\dir-prop-base
.........\...\....\entries
.........\...\....\text-base\Android.mk.svn-base
.........\...\....\.........\hello-jni.c.svn-base
.........\...\....\.........\readme.txt.svn-base
.........\...\Android.mk
.........\...\hello-jni.c
.........\...\readme.txt
.........\libs\.svn\all-wcprops
.........\....\....\dir-prop-base
.........\....\....\entries
.........\....\armeabi\.svn\all-wcprops
.........\....\.......\....\dir-prop-base
.........\....\.......\....\entries
.........\....\.......\....\prop-base\gdbserver.svn-base
.........\....\.......\....\.........\libhello-jni.so.svn-base
.........\....\.......\....\text-base\gdb.setup.svn-base
.........\....\.......\....\.........\gdbserver.svn-base
.........\....\.......\....\.........\libhello-jni.so.svn-base
.........\....\.......\gdb.setup
.........\....\.......\gdbserver
.........\....\.......\libhello-jni.so
.........\obj\.svn\all-wcprops
.........\...\....\dir-prop-base
.........\...\....\entries
.........\...\local\.svn\all-wcprops
.........\...\.....\....\dir-prop-base
.........\...\.....\....\entries
.........\...\.....\armeabi\.svn\all-wcprops
.........\...\.....\.......\....\dir-prop-base
.........\...\.....\.......\....\entries
.........\...\.....\.......\objs-debug\.svn\all-wcprops
.........\...\.....\.......\..........\....\dir-prop-base
.........\...\.....\.......\..........\....\entries
.........\...\.....\.......\..........\hello-jni\.svn\all-wcprops
.........\...\.....\.......\..........\.........\....\dir-prop-base
.........\...\.....\.......\..........\.........\....\entries
.........\...\.....\.......\..........\.........\....\text-base\hello-jni.o.d.svn-base
.........\...\.....\.......\..........\.........\hello-jni.o.d
.........\res\.svn\all-wcprops
.........\...\....\dir-prop-base
.........\...\....\entries
.........\...\drawable-hdpi\.svn\all-wcprops
.........\...\.............\....\dir-prop-base
.........\...\.............\....\entries
.........\...\.........ldpi\.svn\all-wcprops
.........\...\.............\....\dir-prop-base
.........\...\.............\....\entries
.........\...\.........mdpi\.svn\all-wcprops
.........\...\.............\....\dir-prop-base
.........\...\.............\....\entries
.........\...\layout\.svn\all-wcprops
.........\...\......\....\dir-prop-base
.........\...\......\....\entries
.........\...\values\.svn\all-wcprops
.........\...\......\....\dir-prop-base
.........\...\......\....\entries
.........\...\......\....\text-base\strings.xml.svn-base
.........\...\......\strings.xml
.........\src\.svn\all-wcprops
.........\...\....\dir-prop-base
.........\...\....\entries
.........\...\com\.svn\all-wcpro

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