LongPictureShare

长图拼接 说明：三个页面的跳转，然后每个页面形成一张图片，进行拼接。。。

1.书写界面
    2.存储需要画图的界面
    3.画图（Bitmap.createBitmap）
    4.合成图片
    5.保存图片到本地
    
public class Utils {

    private static ArrayList<LinearLayout> mViewArrayList = new ArrayList<>();

    public static void addView(LinearLayout v) {
        mViewArrayList.add(v);
    }

    public static ArrayList<LinearLayout> getView() {
        return mViewArrayList;
    }
}

    每个页面进行跳转前，保存需要画图的控件；
    Utils.addView(viewById);
    
    画图：
      for (LinearLayout scrollView : listView) {
                // 获取listView实际高度
                h = 0;
    
                for (int i = 0; i < scrollView.getChildCount(); i++) {
                    h += scrollView.getChildAt(i).getHeight();
    
                    // 设置背景底色
                   /* int background = scrollView.getChildAt(i).getDrawingCacheBackgroundColor();
                    scrollView.getChildAt(i).setBackgroundColor(background);*/
                }
    
                // 创建对应大小的bitmap
                Bitmap bitmap = Bitmap.createBitmap(scrollView.getWidth(), h, Bitmap.Config.ARGB_8888);
                Canvas canvas = new Canvas(bitmap);
                scrollView.draw(canvas);
    
                bitmaps.add(bitmap);
            }
    
    合成图片：
            public static Bitmap toConformBitmap(ArrayList<Bitmap> bitmaps   /*Bitmap head, Bitmap kebiao, Bitmap san*/) {
                    if (bitmaps == null) {
                        return null;
                    }
            
                    Bitmap first = null;
                    Bitmap second = null;
                    Bitmap third = null;
            
                    for (int i = 0; i < bitmaps.size(); i++) {
                        Bitmap bitmap = bitmaps.get(i);
            
                        if (i == 0) {
                            first = bitmap;
                        } else if (i == 1) {
                            second = bitmap;
                        } else {
                            third = bitmap;
                        }
                    }
            
                    // 获取图片的宽高
                    int headWidth = first.getWidth();
                    int secondWidth = second.getWidth();
                    int lastWidth = third.getWidth();
            
                    int headHeight = first.getHeight();
                    int secondHeight = second.getHeight();
                    int lastHeight = third.getHeight();
            
                    //生成三个图片合并大小的Bitmap
                    Bitmap newBmp = Bitmap.createBitmap(secondWidth, headHeight + secondHeight + lastHeight, Bitmap.Config.ARGB_8888);
                    Canvas cv = new Canvas(newBmp);
                    cv.drawBitmap(first, 0, 0, null);// 在 0，0坐标开始画入headBitmap
            
                    //因为手机不同图片的大小的可能小了 就绘制白色的界面填充剩下的界面
                    if (headWidth < secondWidth) {
                        System.out.println("绘制头");
            
                        Bitmap ne = Bitmap.createBitmap(secondWidth - headWidth, headHeight, Bitmap.Config.ARGB_8888);
                        Canvas canvas = new Canvas(ne);
                        canvas.drawColor(Color.WHITE);
                        cv.drawBitmap(ne, headWidth, 0, null);
                    }
            
                    cv.drawBitmap(second, 0, headHeight, null);// 在 0，headHeight坐标开始填充第二张Bitmap
                    cv.drawBitmap(third, 0, headHeight + secondHeight, null);// 在 0，headHeight + secondHeight 坐标开始第三张图片
            
                    //因为手机不同图片的大小的可能小了 就绘制白色的界面填充剩下的界面
                    if (lastWidth < secondWidth) {
                        System.out.println("绘制");
                        Bitmap ne = Bitmap.createBitmap(secondWidth - lastWidth, lastHeight, Bitmap.Config.ARGB_8888);
                        Canvas canvas = new Canvas(ne);
                        canvas.drawColor(Color.WHITE);
                        cv.drawBitmap(ne, lastWidth, headHeight + secondHeight, null);
                    }
            
                    cv.save(Canvas.ALL_SAVE_FLAG);// 保存
                    cv.restore();// 存储
            
                    //回收
                    first.recycle();
                    second.recycle();
                    third.recycle();
            
                    return newBmp;
                }
    
    保存到本地：
         public static boolean saveImageToGallery(Context context, Bitmap bmp) {
        
                // 首先保存图片
                String storePath = Environment.getExternalStorageDirectory().getAbsolutePath() + File.separator + "medbanks";
                File appDir = new File(storePath);
        
                if (!appDir.exists()) {
                    appDir.mkdir();
                }
        
                String fileName = System.currentTimeMillis() + ".jpg";
                File file = new File(appDir, fileName);
        
                try {
                    FileOutputStream fos = new FileOutputStream(file);
                    //通过io流的方式来压缩保存图片
                    boolean isSuccess = bmp.compress(Bitmap.CompressFormat.JPEG, 60, fos);
                    fos.flush();
                    fos.close();
        
                    //把文件插入到系统图库
                    //MediaStore.Images.Media.insertImage(context.getContentResolver(), file.getAbsolutePath(), fileName, null);
        
                    //保存图片后发送广播通知更新数据库
                    Uri uri = Uri.fromFile(file);
                    context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, uri));
        
                    if (isSuccess) {
                        Toast.makeText(context, "保存成功", Toast.LENGTH_SHORT).show();
                        return true;
                    } else {
                        Toast.makeText(context, "保存成功", Toast.LENGTH_SHORT).show();
                        return false;
                    }
        
                } catch (IOException e) {
                    e.printStackTrace();
                }
        
                return false;
            }