//定义actionbar 背景颜色和进度条颜色 文字颜色   
DefaultHeaderTransformer transformer = (DefaultHeaderTransformer)  
mPullToRefreshLayout.getHeaderTransformer();   
transformer.getHeaderView().findViewById(R.id.ptr_text).setBackgroundColor(getResources().getColor(R.color.title_bg));  
TextView title = (TextView) transformer.getHeaderView().findViewById(R.id.ptr_text);  
title.setTextColor(getResources().getColor(android.R.color.white));   
transformer.setProgressBarColor(getResources().getColor(R.color.title_bg)); 
//transformer.setPullText("下拉加载");

android:cacheColorHint="#00000000"
android:divider="#19000000"