title: UnsatisfiedLinkError: n_Mat while using opencv2.4.3 with android 4.0
body: <p>i am using opencv in android. but when i am adding Mat() in my code my application unexpectedly stops after launch. my error log is as below:</p>
  
  <pre><code>FATAL EXCEPTION: main
  java.lang.UnsatisfiedLinkError: n_Mat
  at org.opencv.core.Mat.n_Mat(Native Method)
  at org.opencv.core.Mat.&lt;init&gt;(Mat.java:441)
  at com.example.imagepro.MainActivity.onCreate(MainActivity.java:36)
  at android.app.Activity.performCreate(Activity.java:4465)
  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
  at android.app.ActivityThread.access$600(ActivityThread.java:123)
  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
  at android.os.Handler.dispatchMessage(Handler.java:99)
  at android.os.Looper.loop(Looper.java:137)     
  at android.app.ActivityThread.main(ActivityThread.java:4424)
  at java.lang.reflect.Method.invokeNative(Native Method)
  at java.lang.reflect.Method.invoke(Method.java:511)
  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  at dalvik.system.NativeStart.main(Native Method)`
  </code></pre>
  
  <p>my code is</p>
  
  <pre><code>import java.io.File;
  import org.opencv.android.BaseLoaderCallback;
  import org.opencv.android.LoaderCallbackInterface;
  import org.opencv.android.OpenCVLoader;
  import org.opencv.core.Mat;
  
  import org.opencv.android.Utils;
  import org.opencv.imgproc.Imgproc;
  
  import android.os.Bundle;
  import android.os.Environment;
  import android.app.Activity;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.util.Log;
  import android.view.Menu;
  import android.view.View;
  import android.widget.ImageView;
  
  public class MainActivity extends Activity {
  
  final String TAG = "Hello World";
  Mat imgToProcess;
  
  private BaseLoaderCallback mOpenCVCallBack = new BaseLoaderCallback(this) {
  @Override
  public void onManagerConnected(int status) {
     switch (status) {
         case LoaderCallbackInterface.SUCCESS:
         {
        Log.i(TAG, "OpenCV loaded successfully");
        // Create and set View
        setContentView(R.layout.activity_main);
         } break;
         default:
         {
        super.onManagerConnected(status);
         } break;
     }
      }
  };
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
  
       Log.i(TAG, "onCreate");
          super.onCreate(savedInstanceState);
  
          Log.i(TAG, "Trying to load OpenCV library");
          if (!OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_3, this, mOpenCVCallBack))
          {
            Log.e(TAG, "Cannot connect to OpenCV Manager");
          }
          else{ Log.i(TAG, "opencv successfully added"); }
  
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      String path = Environment.getExternalStorageDirectory()+ "/Koala.jpg"; // get image from sd card
  
       File imgFile = new File(path);
  
       View v = null;
            if(imgFile.exists())
   {
            Bitmap myBitmap = BitmapFactory.decodeFile(path);                 
           ImageView myImage = (ImageView) findViewById(R.id.imageView);
           myImage.setImageBitmap(myBitmap);
           Log.i(TAG, "opencv successfull 1");
           Mat imgToProcess = new Mat();
           Mat newmat = new Mat();
  
           Utils.bitmapToMat(myBitmap, imgToProcess); 
           Imgproc.cvtColor(imgToProcess, newmat, Imgproc.COLOR_RGB2GRAY); 
   Bitmap outImage = Bitmap.createBitmap(newmat.rows(),newmat.cols(),Bitmap.Config.ARGB_8888);
           Utils.matToBitmap(newmat, outImage);
  
           myImage.setImageBitmap(outImage); 
  
     }
  
   }
  </code></pre>
  
  <p>}</p>
  
  <p>i tried other solutions provided on stackoverflow but none of them worked for me. i have already copied libopencv_java.so and libopencv_info.so into my /libs folder from F:\OpenCV-2.4.3.2-android-sdk\sdk\native\libs\armeabi-v7a but this error remains same.</p>
  
  <p>please help.</p>
  
  <p>thanks in advance :)</p>