使用OpenCV 2.4.2的Android UnsatisfiedLinkError

Question

只是想尝试一个简单的openCV android程序.按照此处的说明下载并安装OpenCV for Android ,并将OpenCV Library 2.4.2添加为我自己的android项目的库项目,如指令状态.

但是,当我编译标准的"Hello World Program"时,如下所示,如果我包含该Mat mat = new Mat();行,则会失败,否则会成功.

package com.example;

import org.opencv.core.Mat;

import android.app.Activity;
import android.os.Bundle;

public class HelloAndroidActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Mat mat = new Mat();
    }
}

这是打印出来的堆栈跟踪:

    07-23 09:59:43.835: E/AndroidRuntime(8222): FATAL EXCEPTION: main
07-23 09:59:43.835: E/AndroidRuntime(8222): java.lang.UnsatisfiedLinkError: n_Mat
07-23 09:59:43.835: E/AndroidRuntime(8222):     at org.opencv.core.Mat.n_Mat(Native Method)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at org.opencv.core.Mat.<init>(Mat.java:181)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at com.example.HelloAndroidActivity.onCreate(HelloAndroidActivity.java:15)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.app.Activity.performCreate(Activity.java:4538)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1071)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2161)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2240)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.app.ActivityThread.access$600(ActivityThread.java:139)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1262)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.os.Looper.loop(Looper.java:154)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at android.app.ActivityThread.main(ActivityThread.java:4977)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at java.lang.reflect.Method.invokeNative(Native Method)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at java.lang.reflect.Method.invoke(Method.java:511)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-23 09:59:43.835: E/AndroidRuntime(8222):     at dalvik.system.NativeStart.main(Native Method)

有两点需要注意:我没有直接使用此代码中的任何原生代码(就像这里的其他一些问题一样),旧的OpenCV 2.3.x库在使用相同的方法之前工作得很好.两个Android项目都具有相同的目标和支持的API设置.

Answer 1

弄清楚了.没有静态链接库.如果您使用此代码,它可以工作.

package com.example;

import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;

import android.app.Activity;
import android.os.Bundle;
import android.util.Log;

public class HelloAndroidActivity extends Activity
{

    final String TAG = "Hello World";

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.main);
       } break;
       default:
       {
      super.onManagerConnected(status);
       } break;
   }
    }
};

/** Called when the activity is first created. */
@Override
public 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_2, this, mOpenCVCallBack))
    {
      Log.e(TAG, "Cannot connect to OpenCV Manager");
    }
}
}

但是,不太喜欢这种"OpenCV Manager"的想法.这使得用户必须在应用程序运行之前手动安装多个软件包.