基于文件类型android在列表视图中显示图像

Question

我正在为android的文件管理器工作，我在列表视图中显示文件/文件夹。此时我想显示文件夹的图标和文件的不同图标。我试图使用File方法isDirectory（）和isFile（）区分两者，但它们只是作为文件出现..除非我导航到根目录，在这种情况下它工作正常。不知道我哪里出错了，这是代码：

public class DisplayDirectoryActivity extends Activity {

List<Map<String, String>> currentFileList = new ArrayList<Map<String, String>>();
String path;
String query;

ListView lv;
SimpleAdapter simpleAdpt;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.display_directory_activity);
    // Show the Up button in the action bar.
    getActionBar().setDisplayHomeAsUpEnabled(true);

    // Receive current directory path
    String currentPath = (String) getIntent().getCharSequenceExtra("currentPath");
    path = currentPath;

    // Add all directories on card to List->Map for display in listview
    populateFiles();

    // Create ListView attached to ListView in xml definition
    lv = (ListView) findViewById(R.id.listView);

    // Create a new adapter with the files needed to be listed
    simpleAdpt = new SimpleAdapter(getBaseContext(), currentFileList,
            R.layout.list_view_adapter, new String[] { "file", "img" },
            new int[] { R.id.file, R.id.img });
    // Set the new adapter to the ListView
    lv.setAdapter(simpleAdpt);

        @Override

public void populateFiles() {
    // Clear list for updating
    currentFileList.clear();
    // Create a file from the current path
    File current = new File(this.path);
    // Array of the files within the current directory
    String[] subFiles = current.list();

    // Add each file in the current directory to currentFileList
    for (int i = 0; i < subFiles.length; i++) {
            currentFileList.add(createEntry("file", subFiles[i]));
    }
}

// Create a map of key to filename for adding to the currentFileList
private HashMap<String, String> createEntry(String type, String name) {
    HashMap<String, String> entry = new HashMap<String, String>();
    File current = new File(name);
    //If the current file is a directory, display icon as folder
    if (current.isDirectory()) {
        entry.put(type, name);
        entry.put("img", String.valueOf(R.drawable.folder));
    }
    //If the current file is not a directory, display icon as a file
    else {
        entry.put(type, name);
        entry.put("img", String.valueOf(R.drawable.file));
    }

    return entry;

}

编辑：createEntry（）中的文件是用错误的参数构造的，问题已修复。