android读取SD卡下面所有的TXT文件名，listView显示出来。

package your.txtsdka;

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;

import android.app.Activity;
import android.os.Bundle;
import android.os.Environment;
import android.util.Log;
import android.widget.ListView;
import android.widget.SimpleAdapter;

public class Txt_sdkaActivity extends Activity {
	private ListView lv;
	ArrayList name;

	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		lv = (ListView) findViewById(R.id.lv);
		name = new ArrayList();
		if (Environment.getExternalStorageState().equals(
				Environment.MEDIA_MOUNTED)) {
			File path = Environment.getExternalStorageDirectory();// 获得SD卡路径
			// File path = new File("/mnt/sdcard/");
			File[] files = path.listFiles();// 读取
			getFileName(files);
		}
		SimpleAdapter adapter = new SimpleAdapter(this, name, R.layout.sd_list,
				new String[] { "Name" }, new int[] { R.id.txt_tv });
		lv.setAdapter(adapter);
		for (int i = 0; i < name.size(); i++) {
			Log.i("zeng", "list.  name:  " + name.get(i));
		}
	}

	private void getFileName(File[] files) {
		if (files != null) {// 先判断目录是否为空，否则会报空指针
			for (File file : files) {
				if (file.isDirectory()) {
					Log.i("zeng", "若是文件目录。继续读1" + file.getName().toString()
							+ file.getPath().toString());

					getFileName(file.listFiles());
					Log.i("zeng", "若是文件目录。继续读2" + file.getName().toString()
							+ file.getPath().toString());
				} else {
					String fileName = file.getName();
					if (fileName.endsWith(".txt")) {
						HashMap map = new HashMap();
						String s = fileName.substring(0,
								fileName.lastIndexOf(".")).toString();
						Log.i("zeng", "文件名txt：：   " + s);
						map.put("Name", fileName.substring(0,
								fileName.lastIndexOf(".")));
						name.add(map);
					}
				}
			}
		}
	}
}