tabhost 按住的效果
m_tabHost.getTabWidget().getChildAt(i)
.setBackgroundResource(R.drawable.selector_tab_background);

<?xml version="1.0" encoding="utf-8"?>
<selector
xmlns:android="http://schemas.android.com/apk/res/android">


<item
android:state_pressed="true"
android:drawable="@drawable/tab_item_p"/>

<item
android:state_selected="true"
android:drawable="@drawable/tab_item_d"/>

</selector>