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POUnsatisfiedLinkError for native cpp function in Android app (ndk)
 

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  1. POUnsatisfiedLinkError for native cpp function in Android app (ndk)
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    <p>I am trying to run an easy Android ndk app in cpp, but I get UnsatisfiedLink Error for the Generate() function. </p> <p>Any help would be appreciated. I am quite fluent in c++, but my java is a little bit rusty. I have been trying a lot of tips from the web concerning naming, but so far no luck. Here are my files:</p> <p>native.cpp:</p> <pre><code>#include &lt;string.h&gt; #include &lt;jni.h&gt; jstring Java_com_optimuse_app_OptimuseAppActivity_generate(JNIEnv* env, jobject thiz){ return env-&gt;NewStringUTF("Hello from JNI !"); } </code></pre> <p>Android.mk:</p> <pre><code>LOCAL_PATH := $(call my-dir) include $(CLEAR_VARS) LOCAL_MODULE := native LOCAL_SRC_FILES := native.cpp include $(BUILD_SHARED_LIBRARY) </code></pre> <p>I compile this with ndk-build and all goes well, it provides me with a libnative.so, that is located in the project directory. I use eclipse for the rest. </p> <p>OptimuseAppActivity.java:</p> <pre><code>package com.optimuse.app; import android.app.Activity; import android.widget.TextView; import android.os.Bundle; public class OptimuseAppActivity extends Activity { @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); TextView tv = new TextView(this); tv.setText( generate() ); setContentView(tv); } public native String generate(); static { System.loadLibrary("native"); } } </code></pre> <p>And the automatically generated AndroidManifest.xml</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.optimuse.app" android:versionCode="1" android:versionName="1.0" &gt; &lt;uses-sdk android:minSdkVersion="15" /&gt; &lt;application android:icon="@drawable/ic_launcher" android:label="@string/app_name" android:hasCode="true"&gt; &lt;activity android:name="com.optimuse.app.OptimuseAppActivity" android:label="@string/app_name" &gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; &lt;/application&gt; &lt;/manifest&gt; </code></pre> <p>Thank you for any suggestions, been searching for a few hours now!</p>
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    1. COJust some extra debugging I already tried: Without the generate() function, the app works fine. If I change the LoadLibrary file to another name, I get an error, so I guess he loads the library fine. I am guessing I made a package/class/naming error somewhere as I am not used to java... been bending my head over it...
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      1. USdorien
    2. COHave you tried putting the System.loadLibrary at the top of the class declaration?
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      1. USForce
    3. COIt looks like you may have be having issues with the differences between the jni C api vs the C++ api. Perhaps take a step back to the hello-jni C example, test it, then do only one of customizing the package name or translating to C++, then do the other only once that works.
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      1. POUnsatisfiedLinkError for native cpp function in Android app (ndk)
      1. USChris Stratton
 

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