也发一个自己实现的android简单文件选择器代码。支持多卡，排序

　　一个很简单的文件选择器对话框，支持双sd卡，当然前提是要有sd卡。。并且实现了排序效果.

只有100多行的代码，基本的思路就是用listview显示目录下的所有子文件，再判断是文件还是目录。

利用Collections.sort方法进行排序。

代码如下:

 package net.yunstudio.demo;

 import java.io.File;
 import java.text.Collator;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Locale;
 import java.util.Map;

 import android.app.Dialog;
 import android.content.Context;
 import android.os.Environment;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.View;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.ListView;
 import android.widget.SimpleAdapter;

 public class FilePickerDialog extends Dialog implements OnItemClickListener{

     public FilePickerDialog(Context context) {
         super(context);
         init();
     }

     private ListView lv_file;
     private SimpleAdapter simpleAdapter;
     private List<Map<String, Object>> dataList;
     private OnFileSelectListener listener;
     //通过获取sd卡的父级，可以兼容双sd卡的情况
     private static final File rootPath=
             Environment.getExternalStorageDirectory().getParentFile(); 

     private static final String SRC="src";
     private static final String NAME="name";
     private static final String FILE="file";
     private static final String IS_BAK="isBak";

     private void init() {
         getChildren2dataList(rootPath);
         simpleAdapter=new SimpleAdapter(getContext(),dataList , R.layout.list_item_choosefile,
                 new String[]{SRC,NAME}, new int[]{R.id.iv_file_type,R.id.tv_file_name});

         lv_file=new ListView(getContext());
         lv_file.setAdapter(simpleAdapter);
         lv_file.setOnItemClickListener(this);
         setContentView(lv_file);

         setCanceledOnTouchOutside(true);
         this.setTitle("请选择文件");
     }
     /**
      * 设置选择文件的监听器
      * @param listener
      */
     public void setOnFileSelectListener(OnFileSelectListener listener) {
         this.listener = listener;
     }
     /**
      * 将本目录的子文件的信息赋值给dataList字段
      * @param dir
      */
     private void getChildren2dataList(File dir) {
         File[] children=dir.listFiles();
         if(dataList==null){
             dataList=new ArrayList<Map<String,Object>>();
         }else {
             dataList.clear();
         }    

         if(!rootPath.equals(dir)){
             Map<String, Object> map=new HashMap<String, Object>();
             map.put(SRC, R.drawable.folder);
             map.put(NAME, "..");
             map.put(FILE, dir.getParentFile());
             map.put(IS_BAK, true);
             dataList.add(map);
         }
         if(children==null) return ;//避免空目录引起的空指针错误
         for (File file : children) {
             Map<String, Object> map=new HashMap<String, Object>();
             map.put(SRC, file.isDirectory()
                                 ?R.drawable.folder
                                 :R.drawable.file);
             map.put(NAME, file.getName());
             map.put(FILE, file);
             dataList.add(map);
         }

         Collections.sort(dataList, new Comparator<Map<String, Object>>() {

             @Override
             public int compare(Map<String, Object> lhs, Map<String, Object> rhs) {
                 int result=0;

                 if(lhs.get(IS_BAK)!=null){
                     result = -1;
                 }else if (rhs.get(IS_BAK)!=null) {
                     result = 1;
                 }else {
                     File lhsFile=(File) lhs.get(FILE);
                     File rhsFile=(File) rhs.get(FILE);  

                     if(lhsFile.isDirectory()&&rhsFile.isFile()){
                         result = -1;
                     }else if (lhsFile.isFile()&&rhsFile.isDirectory()) {
                         result = 1;
                     }else {
                         Collator cmp = Collator.getInstance(Locale.getDefault());
                         result = cmp.compare(lhs.get(NAME), rhs.get(NAME));
                     }
                 }
                 return result;
             }
         });
     }

     @Override
     public void onItemClick(AdapterView<?> parent, View view, int position,
             long id) {
         File file=(File)dataList.get(position).get(FILE);
         if(file.isDirectory()){
             getChildren2dataList(file);
             simpleAdapter.notifyDataSetChanged();
         }else {
             if(listener!=null){
                 listener.onFileSelect(file);
                 this.dismiss();
             }
         }
     }

     public static interface OnFileSelectListener{
         void onFileSelect(File file);
     }
 }

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