public static void sendSMS(Context c) {  
  PaintController.save2Cache(c);// 先把图片保存，再调用系统自带的SMS   
    String imgpath = "file://" + Environment.getExternalStorageDirectory() + "/cache.png";  
    System.out.println("readfrom:" + imgpath);  
    Intent intent = new Intent(Intent.ACTION_SEND);  
    intent.setClassName("com.android.mms", "com.android.mms.ui.ComposeMessageActivity");  
    intent.putExtra("subject", "我的涂鸦");  
  intent.putExtra("sms_body", "看看吧");  
    intent.putExtra(Intent.EXTRA_STREAM, Uri.parse(imgpath));  
    intent.setType("image/png");  
    c.startActivity(intent);  
}