保存图片后通知手机图库

public static void saveImageToGallery(Context context, Bitmap bmp) {    
 // 首先保存图片   
  File appDir = new File(Environment.getExternalStorageDirectory(), "efrobot/pictures");   
  if (!appDir.exists()) {       
     appDir.mkdir();  
  }   
   String fileName = System.currentTimeMillis() + ".jpg";  
   File file = new File(appDir, fileName);   
 try {      
    FileOutputStream fos = new FileOutputStream(file);     
    bmp.compress(Bitmap.CompressFormat.JPEG, 100, fos);      
    fos.flush();    
    fos.close();   
 } catch (FileNotFoundException e) {     
   e.printStackTrace(); 
   } 
 catch (IOException e) {      
   e.printStackTrace();  
  }  
  // 其次把文件插入到系统图库   
 try {        
  MediaStore.Images.Media.insertImage(context.getContentResolver(),  file.getAbsolutePath(),  fileName, null);   
 } catch (FileNotFoundException e) {      
  e.printStackTrace(); 
   }  
  // 最后通知图库更新   
 if (Build.VERSION.SDK_INT < 19) {      
  context.sendBroadcast(new Intent(Intent.ACTION_MEDIA_SCANNER_SCAN_FILE, Uri.parse("file://" +file.getAbsolutePath())));  
  } else {        
    MediaScannerConnection.scanFile(context,  new String[]{file.getAbsolutePath()}, null, null);    }
 }