Android Studio集成OpenCV，全网最保姆级教程 - ToB企服应用市场:ToB评测及商务社交产业平台

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<Button
android:id="@+id/button"
android:text="灰度化"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</Button>
<ImageView
android:id="@+id/image"
android:layout_width="match_parent"
android:layout_height="wrap_content">
</ImageView>
</LinearLayout>

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import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import org.opencv.android.OpenCVLoader;
import org.opencv.android.Utils;
import org.opencv.core.CvType;
import org.opencv.core.Mat;
import org.opencv.imgproc.Imgproc;
public class MainActivity extends AppCompatActivity {
private Button garyButton; // 灰度化启动按钮
private Bitmap oriBitmap, garyBitmap; // oriBitmap:原图；garyBitmap：灰度化图
private ImageView imageView;// 图片组件
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// 导入视图文件
imageView = findViewById(R.id.image);
oriBitmap = BitmapFactory.decodeResource(this.getResources(), R.drawable.yaya);
imageView.setImageBitmap(oriBitmap);
// 按钮监听事件
garyButton = findViewById(R.id.button);
garyButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// 实现图片灰度化
garyImage(oriBitmap);
}
});
}
/**
* 实现图片灰度化
*
* @param bitmap 位图
*/
protected void garyImage(Bitmap bitmap) {
Mat mat = new Mat(bitmap.getHeight(), bitmap.getWidth(), CvType.CV_8UC3);
Utils.bitmapToMat(bitmap, mat);
garyBitmap = Bitmap.createBitmap(mat.width(), mat.height(), Bitmap.Config.ARGB_8888);
Imgproc.cvtColor(mat, mat, Imgproc.COLOR_BGR2GRAY);
Utils.matToBitmap(mat, garyBitmap);
imageView.setImageBitmap(garyBitmap);
}
protected void onResume() {
super.onResume();
if (!OpenCVLoader.initDebug()) {
Log.d("openCv", "openCv加载失败...");
}else {
Log.d("openCv", "openCv加载成功...");
}
}
}

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