scrollview 和listview共存问题

共存问题：

1.listview高度无效，需要重新计算，可以和scrollview共存。

  2.两个都有滚动事件，这时不能共存；要想使用scrollview，可以自定义listview，扩展linearlayout。

两者都可以滑动，共存时listview只能显示一行数据，这时需要重新计算listview的高度

一、在布局中写死listview的高度，虽然能显示多行，对于海量数据并不适合。

二、自定义listview

publicclassMyListViewextendsListView {

 

    publicMyListView(Context context) {

        super(context);

    }

    publicMyListView(Context context, AttributeSet attrs) {

        super(context, attrs);

    }

    publicMyListView(Context context, AttributeSet attrs,

            intdefStyle) {

        super(context, attrs, defStyle);

    }

    @Override

    protectedvoidonMeasure(intwidthMeasureSpec,intheightMeasureSpec) {

        intexpandSpec = MeasureSpec.makeMeasureSpec(Integer.MAX_VALUE >> 2, 

                MeasureSpec.AT_MOST); 

        super.onMeasure(widthMeasureSpec, expandSpec); 

    }

 

}

三、重新设置listview的高度，并在填充adapter(setAdapter())后调用

publicvoidsetListViewHeightBasedOnChildren(ListView listView) { 

   ListAdapter listAdapter = listView.getAdapter();  

   if(listAdapter == null) { 

       return; 

   }

   inttotalHeight = 0; 

   for(inti = 0; i < listAdapter.getCount(); i++) { 

       View listItem = listAdapter.getView(i, null, listView); 

       listItem.measure(0,0); 

       totalHeight += listItem.getMeasuredHeight(); 

   }

   ViewGroup.LayoutParams params = listView.getLayoutParams(); 

   params.height = totalHeight + (listView.getDividerHeight() * (listAdapter.getCount() - 1)); 

   ((MarginLayoutParams)params).setMargins(10,10,10,10);

   listView.setLayoutParams(params); 

}

四、自定义listview，扩展linearlayout

 public class AdapterForLinearLayout extends BaseAdapter {


    private LayoutInflater mInflater;
    private int resource;
    private List<? extends Map<String, ?>> data;
    private String[] from;
    private int[] to;


    public AdapterForLinearLayout(Context context,
            List<? extends Map<String, ?>> data, int resouce, String[] from,
            int[] to) {
        this.data = data;
        this.resource = resouce;
        this.data = data;
        this.from = from;
        this.to = to;
        this.mInflater = (LayoutInflater) context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    }


    @Override
    public int getCount() {
        // TODO Auto-generated method stub
        return data.size();
    }


    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return data.get(position);
    }


    @SuppressWarnings("unchecked")
    public String get(int position, Object key) {
        Map<String, ?> map = (Map<String, ?>) getItem(position);
        return map.get(key).toString();
    }


    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }


    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub


        convertView = mInflater.inflate(resource, null);
        Map<String, ?> item = data.get(position);
        int count = to.length;
        for (int i = 0; i < count; i++) {
            View v = convertView.findViewById(to[i]);
            bindView(v, item, from[i]);
        }
        convertView.setTag(position);
        return convertView;
    }


    /**
     * 绑定视图
     * @param view
     * @param item
     * @param from
     */
    private void bindView(View view, Map<String, ?> item, String from) {
        Object data = item.get(from);
        if (view instanceof TextView) {
            ((TextView) view).setText(data == null ? "" : data.toString());
        }
    }
}