Android惰性图标列表视图

==编辑===

有没有这样的东西不起作用的原因？我觉得它应该起作用，但它不起作用lView.getChildCount返回0，即使列表中有很多内容，然后这会导致强制关闭

for (int i = 0; i < lView.getChildCount(); i++) {
   ImageView imageView = (ImageView) lView.getChildAt(i).findViewById(R.id.listIcon);
   imageView.setImageResource(R.drawable.someIcon);
}

无论如何，这是我目前正在使用的代码，以备不时之需，感谢您的帮助或输入

public class SampleList extends ListActivity {

    private List<String> item = null;
    private List<String> path = null;
    private String root = "/sdcard/somefolder/";
    private String current = null;
    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list);
        context = getApplicationContext();
        try{
            getDir(root);
            File directory = new File(root);
            File[] contents = directory.listFiles();
            if (contents.length == 0) {
                TextView t = new TextView(this); 
                t=(TextView)findViewById(R.id.empty); 
                t.setText(R.string.emptyFol);
            }
        }catch (Exception e) {
            Toast.makeText(NandPicker.this, R.string.nMount, Toast.LENGTH_LONG).show();
        }
    }

    private void getDir(String dirPath){
        item = new ArrayList<String>();
        path = new ArrayList<String>();

        File f = new File(dirPath);
        File[] files = f.listFiles();

        for(int i=0; i < files.length; i++){
            File file = files[i];
            //Problem was adding the path without the /
            //path.add(file.getPath());
            if(file.isDirectory()){
                path.add(file.getPath()+"/");
                item.add(file.getName() + "/");
            }else{
                path.add(file.getPath());
                item.add(file.getName());
            }
        }

        current = dirPath;

        ArrayAdapter<String> fileList = new ArrayAdapter<String>(this, R.layout.row, R.id.rowTextView, item);
        setListAdapter(fileList);
        class IgnoreCaseComparator implements Comparator<String> {
            public int compare(String strA, String strB) {
                return strA.compareToIgnoreCase(strB);
            }
        }
        IgnoreCaseComparator icc = new IgnoreCaseComparator();
        java.util.Collections.sort(path,icc);
        java.util.Collections.sort(item,icc);
    }

    @Override
    protected void onListItemClick(ListView l, View v, final int position, long id) {

    }   
}

---

请看一个例子。这一点经常被提及。

我用一个循环编辑了我的问题，我写了一个我觉得应该可以工作的循环，但是出于某种原因getChildCount方法返回0，即使列表中有很多子项，我也会在适配器和所有设置完成后很好地运行该循环，这不应该更改每个图标吗？

public class SampleList extends ListActivity {

    private List<String> item = null;
    private List<String> path = null;
    private String root = "/sdcard/somefolder/";
    private String current = null;
    Context context;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.list);
        context = getApplicationContext();
        try{
            getDir(root);
            File directory = new File(root);
            File[] contents = directory.listFiles();
            if (contents.length == 0) {
                TextView t = new TextView(this); 
                t=(TextView)findViewById(R.id.empty); 
                t.setText(R.string.emptyFol);
            }
        }catch (Exception e) {
            Toast.makeText(NandPicker.this, R.string.nMount, Toast.LENGTH_LONG).show();
        }
    }

    private void getDir(String dirPath){
        item = new ArrayList<String>();
        path = new ArrayList<String>();

        File f = new File(dirPath);
        File[] files = f.listFiles();

        for(int i=0; i < files.length; i++){
            File file = files[i];
            //Problem was adding the path without the /
            //path.add(file.getPath());
            if(file.isDirectory()){
                path.add(file.getPath()+"/");
                item.add(file.getName() + "/");
            }else{
                path.add(file.getPath());
                item.add(file.getName());
            }
        }

        current = dirPath;

        ArrayAdapter<String> fileList = new ArrayAdapter<String>(this, R.layout.row, R.id.rowTextView, item);
        setListAdapter(fileList);
        class IgnoreCaseComparator implements Comparator<String> {
            public int compare(String strA, String strB) {
                return strA.compareToIgnoreCase(strB);
            }
        }
        IgnoreCaseComparator icc = new IgnoreCaseComparator();
        java.util.Collections.sort(path,icc);
        java.util.Collections.sort(item,icc);
    }

    @Override
    protected void onListItemClick(ListView l, View v, final int position, long id) {

    }   
}