<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context=".MainActivity" >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:text="@string/wellcome_words" />
    <ImageView 
        android:id="@+id/img_huaishi"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/nanhuaijin"
        android:layout_centerInParent="true"/>
    <Button
        android:id="@+id/btn_gray_process"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@id/img_huaishi"
        android:layout_centerHorizontal="true"
        android:text="灰度化"/>"

</RelativeLayout>

package com.example.grayprocess;

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");
				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();
	
		btnProcess.setOnClickListener(new ProcessClickListener());
	}


	@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.nanhuaijin);
		grayBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), Config.RGB_565);
		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...");
	}

	private class ProcessClickListener implements OnClickListener{
		
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			if(isFirst)
			{
				procSrc2Gray();
				isFirst = false;
			}
			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_4, getApplicationContext(), mLoaderCallback);
		Log.i(TAG, "onResume sucess load OpenCV...");
//		new Handler().postDelayed(new Runnable(){
//
//			@Override
//			public void run() {
//				// TODO Auto-generated method stub
//				procSrc2Gray();
//			}
//			
//		}, 1000);
		
	}
	
	
	

}

		new Handler().postDelayed(new Runnable(){

			@Override
			public void run() {
				// TODO Auto-generated method stub
				procSrc2Gray();
			}
			
		}, 1000);