【Android】显示彩色转灰度图片

来源：互联网发布：安卓版组态软件编辑：程序博客网时间：2024/04/28 14:44
package com.duanjiwei.followopencv1;import android.support.v7.app.AppCompatActivity;import android.os.Bundle;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.util.Log;import android.view.View;import android.widget.Button;import android.widget.ImageView;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;public class MainActivity extends AppCompatActivity {    private Button btn;    private ImageView img;    private Bitmap srcBitmap;    private Bitmap grayBitmap;    private static boolean flag = true;    private static boolean isFirst = true;    private static final String TAG = "gao_chun";    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        img = (ImageView)findViewById(R.id.img);        btn = (Button)findViewById(R.id.btn);        btn.setOnClickListener(new ProcessClickListener());    }    @Override    protected void onResume() {        super.onResume();        //load OpenCV engine and init OpenCV library        OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_2_4_9, getApplicationContext(), mLoaderCallback);        Log.i(TAG, "onResume sucess load OpenCV...");    }    //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;            }        }    };    public void procSrc2Gray(){        Mat rgbMat = new Mat();        Mat grayMat = new Mat();        srcBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.genie);        grayBitmap = Bitmap.createBitmap(srcBitmap.getWidth(), srcBitmap.getHeight(), Bitmap.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...");    }    public class ProcessClickListener implements View.OnClickListener{        @Override        public void onClick(View v) {            // TODO Auto-generated method stub            if(isFirst){                procSrc2Gray();                isFirst = false;            }            if(flag){                img.setImageBitmap(grayBitmap);                btn.setText("查看原图");                flag = false;            }else{                img.setImageBitmap(srcBitmap);                btn.setText("灰度化");                flag = true;            }        }    }}
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