OpenCV4Android开发之旅中例程的改进

最近看到在Android上进行OPENCV开发的文章，OpenCV4Android开发之旅(一)----OpenCV2.4简介及 app通过Java接口调用OpenCV的示例（http://blog.csdn.net/yanzi1225627/article/details/16917961），写的很好，但是例程中有些小问题，给博主提出后，可能博主太忙了，没有时间修改，特此将改进的例子贴出，以供参考。代码中的BUG为，在界面切换，旋转屏幕或锁屏后，由于没有重新加载资源，导致无法继续显示。因此还是建议使用OPENCV官方例子中的方法，在OPENCV管理器加载前使界面无法使用，加载后，将所有资源加载，在界面切换后onPause，将界面响应删除。

package com.example.grayimg; 
import org.opencv.android.BaseLoaderCallback;  
import org.opencv.android.OpenCVLoader;  
import org.opencv.android.Utils;  
import org.opencv.core.Mat;  
import org.opencv.imgproc.Imgproc;  
  
import android.app.Activity;  
import android.graphics.Bitmap;  
import android.graphics.Bitmap.Config;  
import android.graphics.BitmapFactory;  
import android.os.Bundle;  
import android.os.Handler;  
import android.util.Log;  
import android.view.Menu;  
import android.view.View;  
import android.view.View.OnClickListener;  
import android.widget.Button;  
import android.widget.ImageView;  
  
public class MainActivity extends Activity {  
  
    Button btnProcess;  
    Bitmap srcBitmap;  
    Bitmap grayBitmap;  
    
    ImageView imgHuaishi;  
    private static boolean flag = true;   
    //private static boolean isFirst = true;   
    private static final String TAG = "MainActivity";  
  
    //OpenCV库加载并初始化成功后的回调函数  
    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {  
  
        @Override  
        public void onManagerConnected(int status) {  
            // TODO Auto-generated method stub  
            switch (status){  
            case BaseLoaderCallback.SUCCESS:  
                Log.i(TAG, "成功加载");  
                //isFirst = true;
                procSrc2Gray();
                btnProcess.setOnClickListener(new ProcessClickListener());  
                break;  
            default:  
                super.onManagerConnected(status);  
                Log.i(TAG, "加载失败");  
                break;  
            }  
              
        }  
    };  
    
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
       
        initUI();  
    }  
  
    @Override
    public void onPause()
    {
        super.onPause();
        btnProcess.setOnClickListener(null);
    }
    
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) {  
        // Inflate the menu; this adds items to the action bar if it is present.  
        getMenuInflater().inflate(R.menu.main, menu);  
        return true;  
    }  
  
    public void initUI(){  
        btnProcess = (Button)findViewById(R.id.btn_gray_process);  
        imgHuaishi = (ImageView)findViewById(R.id.img_huaishi);  
        Log.i(TAG, "initUI sucess...");  
    }  
  
    public void procSrc2Gray(){  
        Mat rgbMat = new Mat();  
        Mat grayMat = new Mat();  
        srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.peashooter);  
        System.out.println(srcBitmap.getWidth() + "," + srcBitmap.getHeight());
        
        grayBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), Config.RGB_565);  
        System.out.println(grayBitmap.getWidth() + "," + grayBitmap.getHeight());
        
        Utils.bitmapToMat(srcBitmap, rgbMat);//convert original bitmap to Mat, R G B.  
        Imgproc.cvtColor(rgbMat, grayMat, Imgproc.COLOR_RGB2GRAY);//rgbMat to gray grayMat  
        Utils.matToBitmap(grayMat, grayBitmap); //convert mat to bitmap  
        Log.i(TAG, "procSrc2Gray sucess...");  
        
        if(flag)
        {
	        imgHuaishi.setImageBitmap(srcBitmap);  
	        btnProcess.setText("灰度化");  
        }
        else
        {
        	imgHuaishi.setImageBitmap(grayBitmap);  
        	btnProcess.setText("查看原图");  
        }
        imgHuaishi.invalidate();
    }  
  
    private class ProcessClickListener implements OnClickListener{  

    	@Override  
    	public void onClick(View v) {  
    		
    		if(flag){  
    			imgHuaishi.setImageBitmap(grayBitmap);  
    			btnProcess.setText("查看原图");  
    			flag = false;  
    		}  
    		else{  
    			imgHuaishi.setImageBitmap(srcBitmap);  
    			btnProcess.setText("灰度化");  
    			flag = true;  
    		}  
    	}  

    }  
	  
    @Override  
    protected void onResume() {  
    	// TODO Auto-generated method stub  
    	super.onResume();  
    	//load OpenCV engine and init OpenCV library  
    	OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_7, getApplicationContext(), mLoaderCallback);  
    	Log.i(TAG, "onResume sucess load OpenCV...");  
    }  
}