摘要： 在res/drawable文件夹新增一个文件，此文件设置了图片的触发状态，你可以设置 state_pressed，state_checked，state_pressed，state_selected，state_focused，state_enabled 等几个状态：android:state_pressedBoolean. "true" if this item should be used when the object is pressed (such as when a button is touched/clicked); "false" if 阅读全文