Android实现读取SD卡下所有TXT文件名并用listView显示出来的方法

package com.zxl;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.pes, 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);          }        }      }    }  }}

<?xml version="1.0" encoding="utf-8"?><RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  android:layout_width="fill_parent"  android:layout_height="fill_parent"  android:orientation="vertical" >  <TextView    android:id="@+id/textView1"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:text="@string/hello" />  <ListView    android:id="@+id/lv"    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:android="http://schemas.android.com/apk/res/android"  android:layout_width="match_parent"  android:layout_height="match_parent"  android:orientation="vertical" >  <TextView    android:id="@+id/txt_tv"    android:layout_width="fill_parent"    android:layout_height="wrap_content"    android:textSize="20pt"    android:layout_weight="1"    /></LinearLayout>