Android将若干图片拼接成长图

/**
 * 拼接图片
 *
 * @param bitmaps 原图片集
 * @return  拼接后的新图
 */
public static Bitmap combineImage(Bitmap... bitmaps) {
    boolean isMultiWidth = false;//是否为多宽度图片集
    int width = 0;
    int height = 0;

    //获取图纸宽度
    for (Bitmap bitmap : bitmaps) {
        if (width != bitmap.getWidth()) {
            if (width != 0) {//过滤掉第一次不同
                isMultiWidth = true;
            }
            width = width < bitmap.getWidth() ? bitmap.getWidth() : width;
        }
    }

    //获取图纸高度
    for (Bitmap bitmap : bitmaps) {
        if (isMultiWidth) {
            height = height + bitmap.getHeight() * width / bitmap.getWidth();
        } else {
            height = height + bitmap.getHeight();
        }
    }

    //创建图纸
    Bitmap newBitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
    //创建画布,并绑定图纸
    Canvas canvas = new Canvas(newBitmap);
    int tempHeight = 0;
    //画图
    for (int i = 0; i < bitmaps.length; i++) {
        if (isMultiWidth) {
            if (width != bitmaps[i].getWidth()) {
                int newSizeH = bitmaps[i].getHeight() * width / bitmaps[i].getWidth();
                Bitmap newSizeBmp = resizeBitmap(bitmaps[i], width, newSizeH);
                canvas.drawBitmap(newSizeBmp, 0, tempHeight, null);
                tempHeight = tempHeight + newSizeH;
                newSizeBmp.recycle();
            } else {
                canvas.drawBitmap(bitmaps[i], 0, tempHeight, null);
                tempHeight = tempHeight + bitmaps[i].getHeight();
            }
        } else {
            canvas.drawBitmap(bitmaps[i], 0, tempHeight, null);
            tempHeight = tempHeight + bitmaps[i].getHeight();
        }
        bitmaps[i].recycle();
    }
    return newBitmap;
}

 

public static Bitmap resizeBitmap(Bitmap bitmap, int newWidth, int newHeight) {
    float scaleWidth = ((float) newWidth) / bitmap.getWidth();
    float scaleHeight = ((float) newHeight) / bitmap.getHeight();
    Matrix matrix = new Matrix();
    matrix.postScale(scaleWidth, scaleHeight);
    Bitmap bmpScale = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);
    return bmpScale;
}