Android筆記： 解決ScrollView嵌套ListView的沖突方法

範例：

1.MainActivity代碼：

public class MainActivity extends Activity
{
                 
//   隻要在設定ListView的Adapter後調用此靜态方法Utility.setListViewHeightBasedOnChildren(listview);
//    即可讓ListView正确的顯示在其父ListView的ListItem中。
//    但是要注意的是，子ListView的每個Item必須是LinearLayout，不能是其他的，因為其他的Layout(如RelativeLayout)
//    沒有重寫onMeasure()，是以會在onMeasure()時抛出異常。
                 
    private ArrayList<String> dataList;
    private ListView listview;
    private ImageView img;
    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
                     
        dataList = new ArrayList<String>();
        for (int i = 0; i < 5; i++)
        {
            String str = "第" + i + "行";
            dataList.add(str);
        }
                     
        img = (ImageView) findViewById(R.id.p_w_picpathView1);
        listview = (ListView) findViewById(R.id.listView1);
                     
                     
        listview.setAdapter(new BaseAdapter()
        {
                         
            @Override
            public View getView(int position, View convertView, ViewGroup parent)
            {
                LayoutInflater inflater = getLayoutInflater();
                View layout = inflater.inflate(R.layout.item, null);
                TextView tv = (TextView) layout.findViewById(R.id.tv_item);
                             
                             
                String str = dataList.get(position);
                tv.setText(str);
                             
                return layout;
            }
                         
            @Override
            public long getItemId(int position)
            {
                return 0;
            }
                         
            @Override
            public Object getItem(int position)
            {
                return null;
            }
                         
            @Override
            public int getCount()
            {
                return dataList.size();
            }
        });
                     
        Utility.setListViewHeightBasedOnChildren(listview);
    }
}      

2.Utility代碼

public class Utility
{
    public static void setListViewHeightBasedOnChildren(ListView listView)
    {
        ListAdapter listAdapter = listView.getAdapter();
        if (listAdapter == null)
        {
            // pre-condition
            return;
        }
            
        int totalHeight = 0;
        for (int i = 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));
        listView.setLayoutParams(params);
    }
}