需求：完成如下界面布局
/**
* Layout container for a view hierarchy that can be scrolled by the user,
* allowing it to be larger than the physical display.? A ScrollView
* is a {@linkFrameLayout}, meaning you should place one child in it
* containing the entire contents to scroll; this child may itself be a layout
* manager with a complex hierarchy of objects.? A child that is often used
* is a {@linkLinearLayout} in a vertical orientation, presenting a vertical
* array of top-level items that the user can scroll through.
*
You should never use a ScrollView with a {@linkListView}, because
* ListView takes care of its own vertical scrolling.? Most importantly, doing this
* defeats all of the important optimizations in ListView for dealing with
* large lists, since it effectively forces the ListView to display its entire
* list of items to fill up the infinite container supplied by ScrollView.
*
The {@linkTextView} class also
* takes care of its own scrolling, so does not require a ScrollView, but
* using the two together is possible to achieve the effect of a text view
* within a larger container.
*
*
ScrollView only supports vertical scrolling. For horizontal scrolling,
* use {@linkHorizontalScrollView}.
*
*@attrref android.R.styleable#ScrollView_fillViewport
*/
ScrollView的特點(diǎn)
1.只能嵌套一個(gè)控件
2.不能和ListView嵌套使用，因?yàn)槎际谴怪被瑒?dòng)，從而獲取不到焦點(diǎn)
3.支持垂直和水平
public class ListViewActivity extends Activity {
privateListView lv;
@Override
protected voidonCreate(Bundle savedInstanceState) {
super.onCreate (savedInstanceState);
setContentView (R.layout.activity_listview);
initView ();
}
private voidinitView() {
lv = (ListView) findViewById (R.id.lv);
ArrayList datas =newArrayList ();
for(inti =0; i <50; i++) {
datas.add ("迎接2017年"+i);
}
LayoutInflater inflater = LayoutInflater.from(this);
View view = inflater.inflate (R.layout.listview_head, lv,false);//可設(shè)置頭布局寬和高
lv.addHeaderView (view);//添加布局到ListView中
ArrayAdapter adapter =newArrayAdapter (this, android.R.layout.simple_list_item_1, datas);
//? ? ? ? lv.setFocusable (false);
lv.setAdapter (adapter);
}
}
