opencv3.0 在 android 上的使用

1. 下载 OpenCV-3.0.0-android-sdk-1.zip
2. 打开 intellj,新建立一个 android 工程后选择工程属性，导入模块(Import module from external model" with Eclipse option)，选择文件夹 OpenCV-3.0.0-android-sdksdkjava
   
3. 设置工程依赖
   

package com.example.testopencv;

import android.content.Intent;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.view.View;
import android.widget.Button;
import org.opencv.android.BaseLoaderCallback;
import org.opencv.android.LoaderCallbackInterface;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.core.Mat;
import org.opencv.core.Point;
import org.opencv.core.Scalar;

import android.os.Bundle;
import android.widget.ImageView;
import android.app.Activity;
import android.graphics.Bitmap;
import org.opencv.imgproc.Imgproc;

import java.io.FileNotFoundException;
import java.io.InputStream;

public class MyActivity extends Activity {
    /**
     * Called when the activity is first created.
     */

    private static final int SELECT_PHOTO = 100;
    private Button selectbt;
    private Button processbt;
    private Bitmap image;
    private ImageView iv;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        selectbt = (Button) findViewById(R.id.button);
        processbt = (Button) findViewById(R.id.start);
        iv = (ImageView) findViewById(R.id.imageView);

//选择图片
        selectbt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent photoPickerIntent = new Intent(Intent.ACTION_PICK);
                photoPickerIntent.setType("image/*");
                startActivityForResult(photoPickerIntent, SELECT_PHOTO);
            }
        });


        processbt.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                OpenCVLoader.initAsync(OpenCVLoader.OPENCV_VERSION_3_0_0, MyActivity.this, mLoaderCallback);
            }
        });


    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent imageReturnedIntent) {
        super.onActivityResult(requestCode, resultCode, imageReturnedIntent);

        switch(requestCode) {
            case SELECT_PHOTO:
                if(resultCode == RESULT_OK){
                    Uri selectedImage = imageReturnedIntent.getData();
                    InputStream imageStream = null;
                    try {
                        imageStream = getContentResolver().openInputStream(selectedImage);
                    } catch (FileNotFoundException e) {
                        e.printStackTrace();
                    }
                    image = BitmapFactory.decodeStream(imageStream);
                }
        }
    }

//process button
    private BaseLoaderCallback mLoaderCallback = new BaseLoaderCallback(this) {
        @Override
        public void onManagerConnected(int status) {
            if (status == LoaderCallbackInterface.SUCCESS ) {
                mainProcess();
            } else {
                super.onManagerConnected(status);
            }
        }
    };

// 增加文字在图像上
    private void mainProcess() {
        Mat m = new Mat();
        Utils.bitmapToMat(this.image, m);
        Imgproc.putText(m, "=====OPENCV PUTTEXT TEST=====", new Point(20, 40), 3, 1, new Scalar(0, 255, 0, 255), 2);
        Bitmap bm = Bitmap.createBitmap(m.cols(), m.rows(), Bitmap.Config.ARGB_8888);
        Utils.matToBitmap(m, bm);
        iv.setImageBitmap(bm);
    }

    @Override
    protected void onResume() {
        super.onResume();
    }
}

增加权限

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.example.testopencv"
          android:versionCode="1"
          android:versionName="1.0">
	<uses-sdk android:minSdkVersion="17"/>
	<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
	<application android:label="@string/app_name" android:icon="@drawable/ic_launcher">
		<activity android:name="MyActivity"
		          android:label="@string/app_name">
			<intent-filter>
				<action android:name="android.intent.action.MAIN"/>
				<category android:name="android.intent.category.LAUNCHER"/>
			</intent-filter>
		</activity>
	</application>
</manifest>

ref

http://answers.opencv.org/question/16993/display-image/

APK download

http://pan.baidu.com/s/1ntN9KBv

source code

http://pan.baidu.com/s/1i3D8Aqh