Android view获取焦点且有黄色高亮效果
//SampleView可以是各种View或ViewGroup
View SampleView;
SampleView.setBackgroundResource(android.R.drawable.list_selector_background);
SampleView.setFocusableInTouchMode(true);
SampleView.requestFocus();
//想设置ViewGroup里各View的焦点顺序特性，可用
//layout.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);根据参数有不同特性
