I'm using couple of commands from this answer to save my bitmap on SD card and then share it via intent.
and here is my final code:
                    View u = findViewById(R.id.mainL);
                    u.setDrawingCacheEnabled(true);                                                
                    LinearLayout z = (LinearLayout) findViewById(R.id.mainL);
                    int totalHeight = z.getHeight();
                    int totalWidth = z.getWidth();
                    u.layout(0, 0, totalWidth, totalHeight);    
                    u.buildDrawingCache(true);
                    Bitmap b = Bitmap.createBitmap(u.getDrawingCache()); 
                    u.setDrawingCacheEnabled(false);
                    String filePath = Environment.getExternalStorageDirectory()
                            + File.separator + "pics/screenshot.jpeg";
                    File imagePath = new File(filePath);
                    FileOutputStream fos;
                    try {
                        fos = new FileOutputStream(imagePath);
                        b.compress(CompressFormat.JPEG, 100, fos);
                        fos.flush();
                        fos.close();
                    } catch (FileNotFoundException e) {
                        Log.e("GREC", e.getMessage(), e);
                    } catch (IOException e) {
                        Log.e("GREC", e.getMessage(), e);
                    }
                    Uri bmpUri = Uri.parse(filePath);
                    Intent shareIntent = new Intent(Intent.ACTION_SEND);
                    shareIntent.setType("image/jpeg");
                    shareIntent.putExtra(Intent.EXTRA_STREAM, bmpUri);
                    shareIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                    startActivity(Intent.createChooser(shareIntent, "Share"));
but now I have two problems.
1)the result Image (screenshot.png) is not reachable with mobile gallery (there is a image file in pics folder in sd card although).
2)when I try to share it via intent, it doesn't send and for example when I send it via Bluetooth the receiver gadget breaks the sending operation.
thanks.
 
     
     
    