小编sri*_*san的帖子

我有两个习惯viewgroups,superViewGroup和subViewGroup.子视图组包含视图.我将我的superviewgroup添加到linearLayout和subViewGroups我的superviewgroup.

onMeasure()superviewgroup被调用但不在子视图组中.但是在这两种情况下onLayout()方法都被调用了.

代码如下

public class SuperViewGroup extends ViewGroup{

    public SuperViewGroup(Context context) {
        super(context);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        Log.i("boxchart","INSIDE ON MEASURE SUPER VIEWGROUP");
    }



    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {

        final int count = getChildCount();

        for (int i = 0; i < count; i++) {
            final View child = getChildAt(i);
            if (child.getVisibility() != …

我正在尝试使用本机代码中的OpenCV lib(即在Android应用程序的jni文件夹中)绘制一个形状,并调用本机方法将图像返回到Java代码并显示它.

怎么做？我找不到使用OpenCV的Android的简单应用程序.我也设置了环境,使用OpenCV为Android提供的示例如cvcamera,校准运行正常.他们使用SWIG作为JNI接口.SWIG是强制性的吗？我没有使用SWIG.我尝试了很多,我还在努力.

在Java中,代码是这样的:

public class HelloJni extends Activity
{
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(new ShapeView(this));
    }

    static {
        System.loadLibrary("hello-jni");
    }
}


class ShapeView extends View
{
    private Bitmap mBitmap;

    private static native Object drawingShape();

    public ShapeView(Context context) {
        super(context);
    }

    protected void onDraw(Canvas canvas) {
        mBitmap = (Bitmap) drawingShape();
        canvas.drawBitmap(mBitmap, 0, 0, null);
    }
}

而在本土jni类中,

#include "ShapeView.h"
#include <string.h>
#include <jni.h>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>


JNIEXPORT jobject JNICALL Java_ShapeView_drawingShape
(JNIEnv *env, jclass obj) { …