Android implements the method of reading all TXT file names under the SD card and displaying them with listView

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public class Txt_sdkaActivity extends Activity {
  private ListView lv;
  ArrayList name;
  /** Called when the activity is first created. */
  @Override
  public void onCreate(Bundle savedInstanceState) {
    (savedInstanceState);
    setContentView();
    lv = (ListView) findViewById();
    name = new ArrayList();
    if (().equals(Environment.MEDIA_MOUNTED)) {
      File path = ();// Obtain SD card path      // File path = new File("/mnt/sdcard/");
      File[] files = ();// Read      getFileName(files);
    }
    SimpleAdapter adapter = new SimpleAdapter(this, name, , new String[] { "Name" }, new int[] { .txt_tv });
    (adapter);
    for (int i = 0; i < (); i++) {
      ("zeng", "list. name: " + (i));
    }
  }
  private void getFileName(File[] files) {
    if (files != null) {// First determine whether the directory is empty, otherwise a null pointer will be reported      for (File file : files) {
        if (()) {
          ("zeng", "If it is a file directory. Continue reading 1" + ().toString() + ().toString());
          getFileName(());
          ("zeng", "If it is a file directory. Continue to read 2" + ().toString() + ().toString());
        } else {
          String fileName = ();
          if ((".txt")) {
            HashMap map = new HashMap();
            String s = (0, (".")).toString();
            ("zeng", "File name txt::" + s);
            ("Name", fileName .substring(0, (".")));
            (map);
          }
        }
      }
    }
  }
}

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:andro
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical" >
  <TextView
    android:
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:text="@string/hello" />
  <ListView
    android:
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_below="@+id/textView1"
    android:layout_marginTop="62dp" >
  </ListView>
</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:andro
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:orientation="vertical" >
  <TextView
    android:
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:textSize="20pt"
    android:layout_weight="1"
    />
</LinearLayout>