/**
* 傳入的activity是要截屏的activity
*/
public static Bitmap getViewBitmap(Activity activity) {
  // View是你需要截圖的View
  View view = activity.getWindow().getDecorView();
  //這兩句必須寫，否則getDrawingCache報空指針
  view.setDrawingCacheEnabled(true);
  view.buildDrawingCache();
  Bitmap b1 = view.getDrawingCache();

  // 獲取狀態(tài)欄高度
  Rect frame = new Rect();
  activity.getWindow().getDecorView().getWindowVisibleDisplayFrame(frame);
  int statusBarHeight = frame.top;

  // 獲取屏幕長和高
  int width = activity.getResources().getDisplayMetrics().widthPixels;
  int height = activity.getResources().getDisplayMetrics().heightPixels;
  // 去掉標題欄
  Bitmap b = Bitmap.createBitmap(b1, 0, statusBarHeight, width, height - statusBarHeight);
  view.destroyDrawingCache();
  return b;
}

public static Bitmap getViewGroupBitmap(ViewGroup viewGroup) {
  //viewGroup的總高度
  int h = 0;
  Bitmap bitmap; 

  // 適用于ListView或RecyclerView等求高度
  for (int i = 0; i < viewGroup.getChildCount(); i++) {
   h += viewGroup.getChildAt(i).getHeight();
  }

  // 若viewGroup是ScrollView，那么他的直接子元素有id的話，如下所示:
  // h = mLinearLayout.getHeight();

  }
  // 創(chuàng)建對應大小的bitmap(重點)
  bitmap = Bitmap.createBitmap(scrollView.getWidth(), h, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);
  scrollView.draw(canvas);
  return bitmap;
 }

/**
* 上下拼接兩個Bitmap,
* drawBitmap的參數(shù)：1.需要畫的bitmap
*     2.裁剪矩形，bitmap會被該矩形裁剪
*     3.放置在canvas的位置矩形，bitmap會被放置在該矩形的位置上
*     4.畫筆
*/
public static Bitmap mergeBitmap_TB_My(Bitmap topBitmap, Bitmap bottomBitmap) {
  int width = topBitmap.getWidth();
  int height = topBitmap.getHeight() + bottomBitmap.getHeight();
  Bitmap bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
  Canvas canvas = new Canvas(bitmap);
  Rect rectTop = new Rect(0, 0, width, topBitmap.getHeight());
  Rect rectBottomRes = new Rect(0, 0, width, bottomBitmap.getHeight());
  RectF rectBottomDes = new RectF(0, topBitmap.getHeight(), width, height);
  canvas.drawBitmap(topBitmap, rectTop, rectTop, null);
  canvas.drawBitmap(bottomBitmap, rectBottomRes, rectBottomDes, null);
  return bitmap;
 }