不满意的链接错误 - 适用于 Android 非本机的 OpenCV [英] Unsatisfied Link Error - OpenCV for Android Non-native

问题描述

几天前，我询问关于运行非原生 OpenCV 代码的 UnsatisfiedLinkError.我以为在重新安装 Eclipse 并关闭/重新打开所有包后问题就解决了，但是在我将 OpenCV 代码放入现有的 onCreate() 方法后，问题又回来了.

A few days ago I asked about an UnsatisfiedLinkError from running non-native OpenCV code. I thought the problem was solved after reinstalling Eclipse and closing/reopening all the packages, but it's back again after I put the OpenCV code into the existing onCreate() method.

我创建了一个新的 Android 应用程序，其中包含一个名为 Start 的活动.然后我转到项目属性并将 OpenCV 添加为库.这是活动的代码 (Start.java):

I created a new Android application with an activity called Start. I then went to project properties and added OpenCV as a library. Here's the code for the activity (Start.java):

package com.test;

import org.opencv.core.Mat;
import org.opencv.highgui.Highgui;

import android.os.Bundle;
import android.app.Activity;
import android.app.AlertDialog;
import android.view.Menu;

public class Start extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_start);

        Mat Image = Highgui.imread("/image.jpg");
        if (Image == null) {
            AlertDialog ad = new AlertDialog.Builder(this).create(); 
            ad.setMessage("Fatal error: can't open /image.jpg!");  
        }
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.activity_start, menu);
        return true;
    }
}

这是日志:

08-13 12:26:14.791: E/Trace(1067): error opening trace file: No such file or directory (2)
08-13 12:26:15.191: W/dalvikvm(1067): No implementation found for native Lorg/opencv/highgui/Highgui;.imread_1:(Ljava/lang/String;)J
08-13 12:26:15.191: D/AndroidRuntime(1067): Shutting down VM
08-13 12:26:15.191: W/dalvikvm(1067): threadid=1: thread exiting with uncaught exception (group=0x40a13300)
08-13 12:26:15.201: E/AndroidRuntime(1067): FATAL EXCEPTION: main
08-13 12:26:15.201: E/AndroidRuntime(1067): java.lang.UnsatisfiedLinkError: Native method not found: org.opencv.highgui.Highgui.imread_1:(Ljava/lang/String;)J
08-13 12:26:15.201: E/AndroidRuntime(1067):     at org.opencv.highgui.Highgui.imread_1(Native Method)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at org.opencv.highgui.Highgui.imread(Highgui.java:324)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at com.test.Start.onCreate(Start.java:18)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.app.Activity.performCreate(Activity.java:5008)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1079)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2023)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2084)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.app.ActivityThread.access$600(ActivityThread.java:130)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1195)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.os.Handler.dispatchMessage(Handler.java:99)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.os.Looper.loop(Looper.java:137)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at android.app.ActivityThread.main(ActivityThread.java:4745)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at java.lang.reflect.Method.invokeNative(Native Method)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at java.lang.reflect.Method.invoke(Method.java:511)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-13 12:26:15.201: E/AndroidRuntime(1067):     at dalvik.system.NativeStart.main(Native Method)

同样，这是非本地代码，因此出现 Unsatisfied Link Error 没有多大意义.

Again, this is non-native code, so having an Unsatisfied Link Error doesn't make much sense.

推荐答案

经过一番搜索，我找到了这个:

After a bunch of searching, I found this:

"3.如果你的应用项目没有JNI部分，只需将对应的OpenCV native libs从/sdk/native/libs/复制到你的项目目录到libs/文件夹即可."

"3. If your application project doesn’t have a JNI part, just copy the corresponding OpenCV native libs from /sdk/native/libs/ to your project directory to folder libs/."

这意味着复制armeabi、armeabi-v7a 和x86 文件夹.

So that means copy the armeabi, armeabi-v7a, and x86 folders.

"4. 在您​​的应用程序中启用 OpenCV 的最后一步是调用 OpenCV API 之前的 Java 初始化代码.例如，它可以在 Activity 类的静态部分中完成，该部分只执行一次，在任何创建类的实例:

"4. The last step of enabling OpenCV in your application is Java initialization code before call to OpenCV API. It can be done, for example, in the static section of the Activity class, which gets executed only once, before any instance of the class is created:

static {
    if (!OpenCVLoader.initDebug()) {
        // Handle initialization error
    }
}

或者，您可以将其放在 onCreate 方法中:

Alternatively, you can put it inside the onCreate method:

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_load_image);
    if (!OpenCVLoader.initDebug()) {
        // Handle initialization error
    }
    [...]
}

现在可以了！

这篇关于不满意的链接错误 - 适用于 Android 非本机的 OpenCV的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！