網上其實有很多通過重寫listview來實現彈性的listview的方法，有的通過添加headview，有的通過scrollView進行嵌套，在這裏有種比較簡單的方法來實現，就是重寫listview中的overScrollBy方法，代碼如下：
/*****************************************/
@TargetApi(Build.VERSION_CODES.GINGERBREAD)
public class MyListView extends ListView{
private int mMaxOverDistance = 250;
public MyListView(Context context, AttributeSet attrs) {
super(context, attrs);
}
@Override
protected boolean overScrollBy(int deltaX, int deltaY, int scrollX,
int scrollY, int scrollRangeX, int scrollRangeY,
int maxOverScrollX, int maxOverScrollY, boolean isTouchEvent) {
// TODO Auto-generated method stub
return super.overScrollBy(deltaX, deltaY, scrollX, scrollY, scrollRangeX,
scrollRangeY, maxOverScrollX, mMaxOverDistance , isTouchEvent);
}
}
/*****************************************/
在這裏更改了mMaxOverDistance 的值，默認的是0，意思是上拉或者下拉的彈性距離爲零，現在我們設置爲250，這個可以根
據自己的喜好。下面貼出是適配器和activity界面的代碼：
/*****************************************/
public class MyAdapter extends BaseAdapter{
private List<String> list;
private Context context;
public MyAdapter(List<String> list,Context context) {
this.list = list;
this.context = context;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder();
convertView = View.inflate(context, R.layout.listview_main, null);
holder.item = (TextView) convertView.findViewById(R.id.tv_item);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.item.setText(list.get(position));
return convertView;
}
@Override
public long getItemId(int position) {
return 0;
}
@Override
public Object getItem(int position) {
return list.get(position);
}
@Override
public int getCount() {
return list.size();
}
public class ViewHolder{
private TextView item;
}
}
/*****************************************/
public class MainActivity extends Activity {
private MyListView lv_main;
private List<String> list;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
init();
}
private void init() {
initView();
initData();
}
private void initView() {
lv_main = (MyListView) findViewById(R.id.lv_main);
}
private void initData() {
list = new ArrayList<String>();
for (int i = 0; i < 20; i++) {
list.add(""+i+1);
}
lv_main.setAdapter(new MyAdapter(list,MainActivity.this));
}
}
/*****************************************/
activity的佈局文件：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.example.progressbardemo.MyListView
android:id="@+id/lv_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
</com.example.progressbardemo.MyListView>
</RelativeLayout>