android ndk - Opportunity to using native methods systemwide. How to call method or how it should be named? -

i want use 1 native library plurality of applications. library has compiled through android build system , located in /system/lib/. can loaded in application through system.loadlibrary("libexample"). method in library should declared like

jniexport jstring jnicall java_application1_mainactivity_method1 

turning out unusable because library should used several applications. , of course several applications have own unique names. tried named method like

 jniexport jstring jnicall method1 

and call

public native string method1(string string); 

but of course application trying find java_application1_mainactivity_method1

how call method or how should named?

updated:

i tried use this(see post green tick) tutorial complete project. wrote library using native method:

package com.example.mylib;  import android.os.bundle; import android.app.activity; import android.view.menu;  public class myclass extends activity { public native static string mymethod(string string);     static {         system.loadlibrary("nativelibrary");     } } 

then trying use in application:

// no interesting inclusions import com.example.mylib.myclass;  public class mainactivity extends listactivity { // no interesting code. mymethod(file.getabsolutepath()) //some no interesting code  } 

and working need! confused import com.example.mylib.myclass; "never used" in eclipse. , if create image "is library" project latest no resolving. idea?

yes, can use same jni signature in many applications. class may not belong default package of application, defined in androidmanifest.xml. what?

---

example:

start hellojni sample ndk (in eclipse, use import -> android -> existing android code, , point ${android-ndk-root}/samples/hello-jni).

build , run on device or emulator.

open new android application project, call testcrossjni. package name our app be: test.cross.jni - no relation com.example.hellojni!

choose "create activity" -> create blank activity.

add new java class project (src/com/example/hellojni/hellojni.java):

package com.example.hellojni;  public class hellojni {     public static string gets() {         return stringfromjni();     }      /* native method implemented      * 'hello-jni' native library, packaged      * application.      */     private native string  stringfromjni();      /* used load 'hello-jni' library on application      * startup. library has been unpacked      * /data/data/com.example.hellojni/lib/libhello-jni.so @      * installation time package manager.      */     static {         system.load("/data/data/com.example.hellojni/lib/libhello-jni.so");     } } 

edit res/layout/activity_main.xml: replace

    line 12 android:text="@string/hello_world" />

    with android:id="@+id/hello_world" />

in src/test/cross/jni/mainactivity.java, add following after

    line 12 setcontentview(r.layout.activity_main);

((android.widget.textview)findviewbyid(r.id.hello_world)).settext(com.example.hellojni.hellojni.gets()); 

profit!