title: Android NDK dlopen failed: cannot locate symbol "ASensor_getReportingMode" referenced by "lib*.so"
body: <p>I have a project that uses Android NDK to access the accelerometer sensor of my device. The application works, except if I try to use the <code>ASensor_getReportingMode()</code> or <code>ASensor_isWakeUpSensor()</code> since it doesn't find the symbols. It probably happens with other functions as well. Strangely there are functions of the same header file such as <code>ASensor_getName()</code> or <code>ASensor_getVendor()</code> that work without problem. Does anyone know what could be missing here?</p>
  
  <p>build.gradle (Module)</p>
  
  <pre class="lang-js prettyprint-override"><code>apply plugin: 'com.android.model.application'
  
  model {
      android {
          compileSdkVersion 24
          buildToolsVersion "24.0.0"
  
          defaultConfig {
              applicationId "com.apidae.sensorndk"
              minSdkVersion.apiLevel 19
              targetSdkVersion.apiLevel 24
              versionCode 1
              versionName "1.0"
          }
          buildTypes {
              release {
                  minifyEnabled false
                  proguardFiles.add(file('proguard-rules.pro'))
              }
          }
          ndk {
              moduleName "ndkfeatures"
              ldLibs.addAll([ 'android', 'log'])
          }
      }
  }
  
  dependencies {
      compile fileTree(dir: 'libs', include: ['*.jar'])
      testCompile 'junit:junit:4.12'
      compile 'com.android.support:appcompat-v7:24.0.0'
  }
  </code></pre>
  
  <p>Java Class</p>
  
  <pre class="lang-java prettyprint-override"><code>package com.apidae.sensorndk;
  
  public class NdkFeatures {
      static {
          System.loadLibrary("ndkfeatures");
      }
      public native boolean init();
  } 
  </code></pre>
  
  <p>C++ Source segment</p>
  
  <pre class="lang-cpp prettyprint-override"><code>#include &lt;android/sensor.h&gt;
  ...
      Log::info("Sensor Info:\n  Name:\t%s\n  Vendor:\t%s\n  Mode:\t%d",
          ASensor_getName(mAccelerometer),
          ASensor_getVendor(mAccelerometer),
          ASensor_getReportingMode(mAccelerometer)); // &lt;- Taking this line out runs
  ...
  </code></pre>
  
  <p>build.gradle (App)</p>
  
  <pre class="lang-js prettyprint-override"><code>buildscript {
      repositories {
          jcenter()
      }
      dependencies {
          classpath 'com.android.tools.build:gradle-experimental:0.7.2'
          classpath 'com.android.tools.build:gradle:2.1.2'
      }
  }
  
  allprojects {
      repositories {
          jcenter()
      }
  }
  
  task clean(type: Delete) {
      delete rootProject.buildDir
  }
  </code></pre>
  
  <p>Full Exception:</p>
  
  <pre><code>E/AndroidRuntime: FATAL EXCEPTION: main 
          Process: com.apidae.sensorndk, PID: 6855
          java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "ASensor_getReportingMode" referenced by "libndkfeatures.so"...
              at java.lang.Runtime.loadLibrary(Runtime.java:371)
              at java.lang.System.loadLibrary(System.java:553)
              at com.apidae.sensorndk.NdkFeatures.&lt;clinit&gt;(NdkFeatures.java:6)
              at com.apidae.sensorndk.MainActivity.onCreate(MainActivity.java:13)
              at android.app.Activity.performCreate(Activity.java:5264)
              at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1088)
              at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2302)
              at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2390)
              at android.app.ActivityThread.access$800(ActivityThread.java:151)
              at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1321)
              at android.os.Handler.dispatchMessage(Handler.java:110)
              at android.os.Looper.loop(Looper.java:193)
              at android.app.ActivityThread.main(ActivityThread.java:5299)
              at java.lang.reflect.Method.invokeNative(Native Method)
              at java.lang.reflect.Method.invoke(Method.java:515)
              at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:825)
              at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:641)
              at dalvik.system.NativeStart.main(Native Method)
  </code></pre>