Question

我有一个这样的方法，它只是将图像分成几个块

public void splitImage(Bitmap bmp, int chunks, int imageCode) {

        int chunkHeight, chunkWidth;
        int rows, cols;
        rows = cols = 5;

        //To store all the small image chunks in bitmap format in this list 
        ArrayList<Bitmap> greyImageChunks = new ArrayList<Bitmap>(chunks);
        ArrayList<Bitmap> greenImageChunks = new ArrayList<Bitmap>(chunks);
        ArrayList<Bitmap> redImageChunks = new ArrayList<Bitmap>(chunks);


        //Getting the scaled bitmap of the source image
        //BitmapDrawable drawable = (BitmapDrawable) image.getDrawable();
        //Bitmap bitmap = drawable.getBitmap();
        Bitmap scaledBitmap = Bitmap.createScaledBitmap(bmp, bmp.getWidth(), bmp.getHeight(), true);

        rows = cols = (int) Math.sqrt(chunks);
        chunkHeight = bmp.getHeight()/rows;
        chunkWidth = bmp.getWidth()/cols;

        //xCoord and yCoord are the pixel positions of the image chunks
        int yCoord = 0;
        for(int x=0; x<rows; x++){
            int xCoord = 0;
            for(int y=0; y<cols; y++){

                if(imageCode == 1) {
                    greyImageChunks.add(Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight));    
                } else if(imageCode == 2) {
                    greenImageChunks.add(Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight));
                } else if(imageCode == 3) {    
                    redImageChunks.add(Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight));
                }

                xCoord += chunkWidth;
            }
            yCoord += chunkHeight;
        }
    }

这里我想使用另一种方法（例如mergeImages（））从greyImageChunks，greenImageChunks和redImageChunks中检索块。

外部世界无法访问它们，因为它们是本地创建的。是否有任何方法可以访问此方法之外的这些数组列表。可以从一个本地ArrayList到另一个全局ArrayList的任何复制方法吗？请帮帮我。

注意：ArrayList大小应该是动态的，因为ArrayList的大小是使用splitImage（）方法中的int块定义的

Answer 1

如果我理解正确，请创建一个全局ArrayList说mArrayList。

ArrayList<Bitmap> mArrayList= new ArrayList<Bitmap>();

现在在你的方法中，在for循环之后将所有三个本地ArrayLists添加到Global ArrayList。

for(int x=0; x<rows; x++){
        int xCoord = 0;
        for(int y=0; y<cols; y++){

            if(imageCode == 1) {
                greyImageChunks.add(Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight));    
            } else if(imageCode == 2) {
                greenImageChunks.add(Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight));
            } else if(imageCode == 3) {    
                redImageChunks.add(Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight));
            }

            xCoord += chunkWidth;
        }
        yCoord += chunkHeight;
    }
mArrayList.addAll(greyImageChunks);
mArrayList.addAll(greenImageChunks);
mArrayList.addAll(redImageChunks);

Answer 2

对imagechunks使用数组而不是ArrayList，并让你的splitImage()方法返回位图数组的Arraylist？像这样：

return ArrayList<Bitmap[]> chunksArray;

编辑：

public ArrayList<Bitmap[]> splitImage(Bitmap bmp, int chunks, int imageCode){
    int chunkHeight, chunkWidth;
    int rows, cols;
    rows = cols = 5;

    //To store all the small image chunks in bitmap format in this list
   // ArrayList<Bitmap> greyImageChunks = new ArrayList<Bitmap>(chunks);
    //ArrayList<Bitmap> greenImageChunks = new ArrayList<Bitmap>(chunks);
   // ArrayList<Bitmap> redImageChunks = new ArrayList<Bitmap>(chunks);
    Bitmap [] greyImageChunks = new Bitmap[chunks];
    Bitmap [] greenImageChunks = new Bitmap[chunks];
    Bitmap [] redImageChunks = new Bitmap[chunks];

    ArrayList< Bitmap[]> arrayList = new ArrayList<>();



    //Getting the scaled bitmap of the source image
    //BitmapDrawable drawable = (BitmapDrawable) image.getDrawable();
    //Bitmap bitmap = drawable.getBitmap();
    Bitmap scaledBitmap = Bitmap.createScaledBitmap(bmp, bmp.getWidth(), bmp.getHeight(), true);

    rows = cols = (int) Math.sqrt(chunks);
    chunkHeight = bmp.getHeight()/rows;
    chunkWidth = bmp.getWidth()/cols;

    //xCoord and yCoord are the pixel positions of the image chunks
    int yCoord = 0, greyCount=0, greenCount=0, redCount=0;
    for(int x=0; x<rows; x++){
        int xCoord = 0;
        for(int y=0; y<cols; y++){

            if(imageCode == 1) {
                greyImageChunks[greyCount]= Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight);
                greyCount++;
            } else if(imageCode == 2) {
                greenImageChunks[greenCount]= Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight);
                greenCount++;
            } else if(imageCode == 3) {
                redImageChunks[redCount]= Bitmap.createBitmap(scaledBitmap, xCoord, yCoord, chunkWidth, chunkHeight);
                redCount++;
            }

            xCoord += chunkWidth;
        }
        yCoord += chunkHeight;
    }
    arrayList.add(greyImageChunks);
    arrayList.add(greenImageChunks);
    arrayList.add(redImageChunks);


    return arrayList;

}

从本地Arraylist复制到android中的全局ArrayList

2 个答案: