在android上利用opencv进行图像灰度化

package com.jerry; import android.app.Activity; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.ImageView; public class ImgColorToGray extends Activity { /** Called when the activity is first created. */ Button btnChange; ImageView imgView; Bitmap imgSample; String path=""; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnChange=(Button)findViewById(R.id.btnChange); imgView=(ImageView)findViewById(R.id.imgChange); path="/sdcard/sample.bmp"; imgSample=BitmapFactory.decodeFile(path); imgView.setImageBitmap(imgSample); btnChange.setOnClickListener(new OnClickListener(){ public void onClick(View v){ imgSample=BitmapFactory.decodeFile(cvRgb2Gray(path)); imgView.setImageBitmap(imgSample); } }); } private native String cvRgb2Gray(String path); static { System.loadLibrary("rgb2gray"); } }