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

本文实例讲述了android实现读取sd卡下所有txt文件名并用listview显示出来的方法。分享给大家供大家参考，具体如下：

mainactivity.java

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);
          }
        }
      }
    }
  }
}

main.xml

<?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>

pes.xml

<?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>

更多关于android相关内容感兴趣的读者可查看本站专题：《android编程开发之sd卡操作方法汇总》、《android文件操作技巧汇总》、《android数据库操作技巧总结》、《android编程之activity操作技巧总结》、《android开发入门与进阶教程》、《android资源操作技巧汇总》、《android视图view技巧总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。