Android打开指定好友聊天，并可以判断是否安装qq

String url = "mqqwpa://im/chat?chat_type=wpa&uin=1346577";//1346577 qq号

Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));

List<ResolveInfo> list = getActivity().getPackageManager().queryIntentActivities(intent, 0);
if (list.size() > 0) {
    startActivity(intent);
} else {
    Toast toast = Toast.makeText(getActivity(),
 "你的手机没有安装qq,请使用在线留言功能,或者安装手机qq", Toast.LENGTH_SHORT);
    toast.setGravity(Gravity.CENTER,0,0);
    toast.show();
}