RongIM.getInstance().getRongIMClient().removeConversation(Conversation.ConversationType.PRIVATE, "18825077460", new RongIMClient.ResultCallback<Boolean>() {
    @Override
    public void onSuccess(Boolean aBoolean) {
        Toast.makeText(context,aBoolean + "" ,Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onError(RongIMClient.ErrorCode errorCode) {

    }
});