Android给scrollView截图超过屏幕大小形成长图

/** 
   * 截取scrollview的屏幕 
   * @param scrollView 
   * @return 
   */ 
  public static Bitmap getBitmapByView(ScrollView scrollView) { 
    int h = 0; 
    Bitmap bitmap = null; 
    // 获取scrollview实际高度 
    for (int i = 0; i < scrollView.getChildCount(); i++) { 
      h += scrollView.getChildAt(i).getHeight(); 
      scrollView.getChildAt(i).setBackgroundColor( 
          Color.parseColor("#ffffff")); 
    } 
    // 创建对应大小的bitmap 
    bitmap = Bitmap.createBitmap(scrollView.getWidth(), h, 
        Bitmap.Config.RGB_565); 
    final Canvas canvas = new Canvas(bitmap); 
    scrollView.draw(canvas); 
    return bitmap; 
  } 
 
  /** 
   * 压缩图片 
   * @param image 
   * @return 
   */ 
  public static Bitmap compressImage(Bitmap image) { 
    ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
    // 质量压缩方法，这里100表示不压缩，把压缩后的数据存放到baos中 
    image.compress(Bitmap.CompressFormat.JPEG, 100, baos); 
    int options = 100; 
    // 循环判断如果压缩后图片是否大于100kb,大于继续压缩 
    while (baos.toByteArray().length / 1024   100) { 
      // 重置baos 
      baos.reset(); 
      // 这里压缩options%，把压缩后的数据存放到baos中 
      image.compress(Bitmap.CompressFormat.JPEG, options, baos); 
      // 每次都减少10 
      options -= 10; 
    } 
    // 把压缩后的数据baos存放到ByteArrayInputStream中 
    ByteArrayInputStream isBm = new ByteArrayInputStream(baos.toByteArray()); 
    // 把ByteArrayInputStream数据生成图片 
    Bitmap bitmap = BitmapFactory.decodeStream(isBm, null, null); 
    return bitmap; 
  } 
 
/** 
   * 保存到sdcard 
   * @param b 
   * @return 
   */ 
  public static String savePic(Bitmap b) { 
    SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd_HH-mm-ss", 
        Locale.US); 
    File outfile = new File("/sdcard/image"); 
    // 如果文件不存在，则创建一个新文件 
    if (!outfile.isDirectory()) { 
      try { 
        outfile.mkdir(); 
      } catch (Exception e) { 
        e.printStackTrace(); 
      } 
    } 
    String fname = outfile + "/" + sdf.format(new Date()) + ".png"; 
    FileOutputStream fos = null; 
    try { 
      fos = new FileOutputStream(fname); 
      if (null != fos) { 
        b.compress(Bitmap.CompressFormat.PNG, 90, fos); 
        fos.flush(); 
        fos.close(); 
      } 
    } catch (FileNotFoundException e) { 
      e.printStackTrace(); 
    } catch (IOException e) { 
      e.printStackTrace(); 
    } 
    return fname; 
  } 

String fname = ScreenShot.savePic(ScreenShot.getBitmapByView(scrollView)); 

String fname = ScreenShot.savePic(ScreenShot.compressImage(ScreenShot 
            .getBitmapByView(scrollView)));