imread不會在OpenCV中與Android

Question

工作，這是我的代碼：

package com.example.edgedetection; 

import java.io.File; 

import org.opencv.android.BaseLoaderCallback; 
import org.opencv.android.LoaderCallbackInterface; 
import org.opencv.android.OpenCVLoader; 
import org.opencv.core.CvType; 
import org.opencv.core.Mat; 
import org.opencv.core.Size; 
import org.opencv.highgui.Highgui; 
import org.opencv.imgproc.Imgproc; 
import android.app.Activity; 
import android.graphics.Bitmap; 
import android.graphics.BitmapFactory; 
import android.os.Bundle; 
import android.widget.Button; 
import android.widget.ImageView; 
import android.widget.Toast; 

public class MainActivity extends Activity { 
private BaseLoaderCallback mOpenCVCallBack = new BaseLoaderCallback(this) { 
     @Override 
     public void onManagerConnected(int status) { 
      switch (status) { 
        case LoaderCallbackInterface.SUCCESS: 
        { 

        } break; 
        default: 
        { 
         super.onManagerConnected(status); 
        } break; 
       } 
     } 
     }; 
    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     double scale = 0.1; 
     imageview = (ImageView)this.findViewById(R.id.image_view); 
     Bitmap bm1=BitmapFactory.decodeFile("/mnt/sdcard/test1.bmp"); 
     imageview.setImageBitmap(bm1); 
     Mat img = Highgui.imread("/mnt/sdcard/test1.bmp",1); 

     Size dsize = new Size(img.width()*scale,img.height()*scale); 
     Mat img2 = new Mat(dsize,CvType.CV_8SC1); 
     Mat img3 = new Mat(); 
     img.convertTo(img2, CvType.CV_8SC1); 
     Imgproc.Canny(img, img3, 123, 250); 

     boolean flag=Highgui.imwrite("mnt/sdcard/new.jpg", img3); 
     if(flag) 
     { 
      File f = new File("mnt/sdcard/new.jpg"); 
      if(f.exists()) 
      { 
       Bitmap bm=BitmapFactory.decodeFile("mnt/sdcard/new.jpg"); 
       imageview.setImageBitmap(bm); 
      } 
     }//end if 
     else{ 
     Toast.makeText(MainActivity.this, "===========fail to write！============！！", 3).show(); 
     } 
    } 

    @Override 
    public void onResume() 
    { 
     super.onResume(); 
     OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_9, this, mOpenCVCallBack); 
    } 
} 

我有進口的OpenCV 2.4.9到我的項目。當我試圖在我的Nexus 4運行它顯示了這一點：

java.lang.UnsatisfiedLinkError: No implementation found for long 
org.opencv.highgui.Highgui.imread_0(java.lang.String,int) (tried 
Java_org_opencv_highgui_Highgui_imread_10 and 
Java_org_opencv_highgui_Highgui_imread_10_Ljava_lang_String_2I) 

誰能幫我出這個好嗎？

Answer 1

試試以下代碼直接通過imread訪問文件。

File root = Environment.getExternalStorageDirectory(); 
    File file = new File(root, "test1.bmp"); 
    Mat m = Highgui.imread(file.getAbsolutePath()); 
    if (m.data) 
    { 
    showToast("Height: " + m.height() + " Width: " + m.width()); 
    } 
    else 
    { 
    // display error message and exit 
    } 

Answer 2

請移動從的onCreate代碼（）來onCameraViewStarted（）或進入

case LoaderCallbackInterface.SUCCESS: 
{ 
} 

括號。

在完成加載之前，即（異步）mOpenCVCallBack完成之後，您無法使用opencv代碼。