我试图编写一个简单的OpenCV Android程序。按照这里的说明下载并安装了OpenCV for Android,然后像说明中所述将OpenCV Library 2.4.2作为库项目添加到我的Android项目中。
然而,当我编译标准的“Hello World程序”时,如果包括Mat mat = new Mat();
这行代码,则编译失败;否则编译成功。
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();
}
}
这是它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)
需要注意两件事情:我在这段代码中没有直接使用任何本地的东西(就像其他一些问题所述),而且旧的OpenCV 2.3.x库在使用相同的方法之前工作得很好。这两个Android项目具有相同的目标和支持的API设置。
static{ System.loadLibrary("opencv_java3"); }
- M Faisal Hameed