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PONo JNI_OnLoad found skipping init > Application shutdown
 

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    <p>Folks,</p> <p>I am working on an android application where I need a third party .so library. I built this third party library (with ndk-build) as per their instructions and was then looking to include this .so in to my Android project.</p> <p>Therefore I followed the steps described in docs/PREBUILTS.html and successfully build the new .so in the jni/prebuilt directory. Now I tried leveraging the .so facilities by using it in a simple test android app. So what i do is :</p> <pre><code>static { Log.i("load so &gt; ","load so"); System.loadLibrary("xyz"); } /* The native functions */ private static native int openFile(String filename); @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); try{ String path = getPathForDownloadDirectoryFile(); Log.i("file path&gt; ", path); int num= openFile(path); }catch(Exception e){ Log.e("&gt;", "could not open the file"); } } </code></pre> <p>Now when I run my app I get a debug message saying : No JNI_OnLoad found in /data/data/com.example.myfirstapp/lib/xyz.so 0x411e6738, skipping init and then the application shuts down. </p> <p>For More Info, Here is the error log :</p> <pre><code>No JNI_OnLoad found in /data/data/com.example.mysecondapp/lib/xyz.so 0x411e67a0, skipping init W/dalvikvm( 570): No implementation found for native Lcom/example/mysecondapp/MainActivity;.openFile:(Ljava/lang/String;)I D/AndroidRuntime( 570): Shutting down VM W/dalvikvm( 570): threadid=1: thread exiting with uncaught exception (group=0x40a13300) E/AndroidRuntime( 570): FATAL EXCEPTION: main E/AndroidRuntime( 570): java.lang.UnsatisfiedLinkError: Native method not found: com.example.mysecondapp.MainActivity.openFile:(Ljava/lang/String;)I E/AndroidRuntime( 570): at com.example.mysecondapp.MainActivity.openFile(Native Method) E/AndroidRuntime( 570): at com.example.mysecondapp.MainActivity.onCreate(MainActivity.java:31) E/AndroidRuntime( 570): at android.app.Activity.performCreate(Activity.java:5008) E/AndroidRuntime( 570): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079) E/AndroidRuntime( 570): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023) E/AndroidRuntime( 570): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084) E/AndroidRuntime( 570): at android.app.ActivityThread.access$600(ActivityThread.java:130) E/AndroidRuntime( 570): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195) E/AndroidRuntime( 570): at android.os.Handler.dispatchMessage(Handler.java:99) E/AndroidRuntime( 570): at android.os.Looper.loop(Looper.java:137) E/AndroidRuntime( 570): at android.app.ActivityThread.main(ActivityThread.java:4745) E/AndroidRuntime( 570): at java.lang.reflect.Method.invokeNative(Native Method) E/AndroidRuntime( 570): at java.lang.reflect.Method.invoke(Method.java:511) E/AndroidRuntime( 570): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786) E/AndroidRuntime( 570): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553) E/AndroidRuntime( 570): at dalvik.system.NativeStart.main(Native Method) W/ActivityManager( 146): Force finishing activity com.example.mysecondapp/.MainActivity </code></pre> <p>As I could see that native implementation for the openFile() method was not found but the same xyz.so lib worked pretty neat with the original sample app from the third party. I am pretty much a starter with Android-ndk world. </p> <p>Java-Android-NDK Ninjas ..any guess on what I might be missing ? I'll highly appreciate any help here :)</p>
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