java - OnClickListener 不显示我的函数的输出

Question

我做了2个功能，第一个功能是为图像提供亮度，第二个功能是将图像转换为灰度，下面是我的jni代码(我正在使用带有eclipse的android)

int toGray(Mat mSrc, Mat& bgra);
int tobrightness(Mat mSrc, Mat& bgra);

extern "C" {

JNIEXPORT jint JNICALL Java_org_opencv_samples_NativeActivity_CvNativeActivity_grayimg(JNIEnv* env, jobject,jint width, jint height, jintArray in, jintArray out)
   {
       jint* _in = env->GetIntArrayElements(in, 0);
       jint* _out = env->GetIntArrayElements(out, 0);

       Mat mSrc(height, width, CV_8UC4, (unsigned char*)_in);
       Mat bgra(height, width, CV_8UC4, (unsigned char*)_out);

       int conv;
       jint retVal;
       conv = toGray(mSrc ,bgra);
       retVal = (jint)conv;

       env->ReleaseIntArrayElements(in, _in, 0);
       env->ReleaseIntArrayElements(out, _out, 0);
       return retVal;

   }
}


JNIEXPORT jint JNICALL Java_org_opencv_samples_NativeActivity_CvNativeActivity_eqhist(JNIEnv* env, jobject,jint width, jint height, jintArray in, jintArray out)
   {
       jint* _in = env->GetIntArrayElements(in, 0);
       jint* _out = env->GetIntArrayElements(out, 0);

       Mat mSrc(height, width, CV_8UC4, (unsigned char*)_in);
       Mat bgra(height, width, CV_8UC4, (unsigned char*)_out);
       Mat bgr(height, width, CV_8UC3);
       int conv;
       jint retVal;
       conv = tobrightness(mSrc, bgra);
       retVal = (jint)conv;

       env->ReleaseIntArrayElements(in, _in, 0);
       env->ReleaseIntArrayElements(out, _out, 0);
       return retVal;

}
int tobrightness(Mat mSrc, Mat& bgra)
{
    vector<Mat> sChannels;
    split(mSrc, sChannels);

    for(int i=0; i<sChannels.size(); i++)
    {
        Mat channel = sChannels[i];
        equalizeHist(channel, channel);
    }
    merge(sChannels, bgra);
    return 1;
}

int toGray(Mat mSrc, Mat& bgra)
{
    Mat gray(mSrc.rows, mSrc.cols, CV_8UC1);
    cvtColor(mSrc , gray , CV_BGRA2GRAY);
    cvtColor(gray , bgra , CV_GRAY2BGRA);
    return 1;
}

像我上面那样在一个 cpp 文件中调用它两次/三次或多次 jni 方法是否可以？因为我希望，如果我单击一个按钮，它应该执行亮度功能，而当我单击第二个按钮时，它应该执行灰度，所以我是否可以在这个场景中使用上面的 cpp ？

下面是我的java代码:

public class CvNativeActivity extends Activity
{
    public native int eqhist(int width, int height, int [] mPhotoIntArray, int [] mCannyOutArray);
    public native int grayimg(int width, int height, int [] mPhotoIntArray, int [] mCannyOutArray);

    static 
    {
        System.loadLibrary("native_activity");
        Log.i("EqActivity", "native library loaded successfully");
    }
    /** Called when the activity is first created. */ 
    ImageView imageview_1;
    ImageView imageview_2;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
         imageview_1=(ImageView) findViewById(R.id.imageView1);
         imageview_2=(ImageView) findViewById(R.id.imageView2);

        InputStream is;
        is = this.getResources().openRawResource(R.drawable.me);
        Bitmap bmInImg = BitmapFactory.decodeStream(is);

        int [] mPhotoIntArray;
        int [] mCannyOutArray;

        mPhotoIntArray = new int[bmInImg.getWidth() * bmInImg.getHeight()];
        imageview_1.setImageBitmap(bmInImg);
        // Copy pixel data from the Bitmap into the 'intArray' array
        bmInImg.getPixels(mPhotoIntArray, 0, bmInImg.getWidth(), 0, 0, bmInImg.getWidth(), bmInImg.getHeight());

        //create the Brightness result buffer
        mCannyOutArray = new int[bmInImg.getWidth() * bmInImg.getHeight()];


        eqhist(bmInImg.getHeight(), bmInImg.getWidth(), mPhotoIntArray, mCannyOutArray);
        grayimg(bmInImg.getHeight(), bmInImg.getWidth(), mPhotoIntArray, mCannyOutArray);

        //
        // Convert the result to Bitmap
        //
        Bitmap bmOutImg = Bitmap.createBitmap(bmInImg.getWidth(), bmInImg.getHeight(), Config.ARGB_8888);  
        bmOutImg.setPixels(mCannyOutArray, 0, bmInImg.getWidth(), 0, 0, bmInImg.getWidth(), bmInImg.getHeight());


        imageview_2.setImageBitmap(bmOutImg);
        String extStorageDirectory = Environment.getExternalStorageDirectory().toString();
        String outFileName = extStorageDirectory + "/me.png";

        OutputBitmapToFile(bmOutImg, outFileName);   
    }
}
void OutputBitmapToFile(Bitmap InBm, String Filename)
    {
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        InBm.compress(Bitmap.CompressFormat.PNG, 100, bytes);

        File f = new File(Filename);
        try
        {
            f.createNewFile();
            //write the bytes in file
            FileOutputStream fo = new FileOutputStream(f);
            fo.write(bytes.toByteArray());

        } 
        catch (Exception e) 
        {
            e.printStackTrace();
        }           
    }
}

上面的代码工作正常并显示 eqhist 方法的输出

但是通过单击按钮调用函数(我在上面的代码中调整了下面的代码，没有收到错误，但没有显示输出):

Button button= (Button) findViewById(R.id.NextButton);
        button.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                eqhist(bmInImg.getHeight(), bmInImg.getWidth(), mPhotoIntArray, mCannyOutArray);

            }
        });

错误:

08-05 00:42:21.656: E/ActivityManager(360): writeStringToFile error: /sys/kernel/debug/tracing/tracing_enabled java.io.FileNotFoundException: /sys/kernel/debug/tracing/tracing_enabled: open failed: ENOENT (No such file or directory)
08-05 00:57:56.150: E/ActivityManager(360): ANR in org.opencv.samples.NativeActivity (org.opencv.samples.NativeActivity/.CvNativeActivity)
08-05 00:57:56.150: E/ActivityManager(360): Reason: keyDispatchingTimedOut
08-05 01:18:16.986: E/Trace(20443): error opening trace file: No such file or directory (2)

编辑:

main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#000000"
     >

    <ImageView
        android:id="@+id/imageView1"
        android:contentDescription="@null"
        android:layout_width="200dp"
        android:layout_height="200dp"
         />

    <ImageView
        android:id="@+id/imageView2"
        android:contentDescription="@null"
        android:layout_width="250dp"
        android:layout_height="250dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true" />

 <Button
     android:id="@+id/NextButton"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_alignBottom="@+id/imageView1"
     android:layout_alignParentRight="true"
     android:layout_marginRight="21dp"
     android:text="@string/Next_Button" />

</RelativeLayout>

Answer 1

正如我在评论中所说，您在java文件中犯了很少的错误，您的其他文件没问题，您没有将结果放在按钮上单击，因此按钮没有任何内容可显示(没有 ImageView )，您的输出位图位于按钮之外单击，您的位图在按钮单击时没有任何内容可显示，将这些行放在按钮单击内

Bitmap bmOutImg = Bitmap.createBitmap(bmInImg.getWidth(), bmInImg.getHeight(), Config.ARGB_8888);  
bmOutImg.setPixels(mCannyOutArray, 0, bmInImg.getWidth(), 0, 0, bmInImg.getWidth(), bmInImg.getHeight());   
imageview_2.setImageBitmap(bmOutImg);

下面的代码对我有用，因为我在 Android 上进行了测试，但它有点慢:

Button button= (Button) findViewById(R.id.NextButton);
button.setOnClickListener(new OnClickListener() {

    @Override
public void onClick(View v)  {
        // TODO Auto-generated method stub
        Log.i("APP: ", "Into OnClick of SettingDialog. View = " + v);
        eqhist(bmInImg.getHeight(),bmInImg.getWidth(), mPhotoIntArray, mCannyOutArray); 
        Bitmap bmOutImg = Bitmap.createBitmap(bmInImg.getWidth(), bmInImg.getHeight(), Config.ARGB_8888);  
        bmOutImg.setPixels(mCannyOutArray, 0, bmInImg.getWidth(), 0, 0, bmInImg.getWidth(), bmInImg.getHeight());   
        imageview_2.setImageBitmap(bmOutImg);


    }
    });