Android获取手机文件夹及文件列表的方法

先看看效果图：

package wuwang.tools.utils; 
 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.FileNotFoundException; 
import java.io.IOException; 
import java.text.DecimalFormat; 
import java.util.ArrayList; 
import java.util.Comparator; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
 
import android.os.Environment; 
 
 
 
public class GetFilesUtils { 
   
  public static final String FILE_TYPE_FOLDER="wFl2d"; 
   
  public static final String FILE_INFO_NAME="fName"; 
  public static final String FILE_INFO_ISFOLDER="fIsDir"; 
  public static final String FILE_INFO_TYPE="fFileType"; 
  public static final String FILE_INFO_NUM_SonDIRS="fSonDirs"; 
  public static final String FILE_INFO_NUM_SonFILES="fSonFiles"; 
  public static final String FILE_INFO_PATH="fPath"; 
   
  private static GetFilesUtils gfu; 
   
  private GetFilesUtils(){ 
     
  } 
   
   
  public static synchronized GetFilesUtils getInstance(){ 
    if(gfu==null){ 
      gfu=new GetFilesUtils(); 
    } 
    return gfu; 
  } 
   
   
  public List> getSonNode(File path){ 
    if(path.isDirectory()){ 
      List> list=new ArrayList>(); 
      File[] files=path.listFiles(); 
      if(files!=null){ 
 
 for(int i=0;i fileInfo=new HashMap(); 
   fileInfo.put(FILE_INFO_NAME, files[i].getName()); 
   if(files[i].isDirectory()){ 
     fileInfo.put(FILE_INFO_ISFOLDER, true); 
     File[] bFiles=files[i].listFiles(); 
     if(bFiles==null){ 
fileInfo.put(FILE_INFO_NUM_SONDIRS, 0); 
fileInfo.put(FILE_INFO_NUM_SONFILES, 0); 
     }else{ 
int getNumOfDir=0; 
for(int j=0;j> getSonNode(String pathStr){ 
    File path=new File(pathStr); 
    return getSonNode(path); 
  } 
   
   
  public List> getBrotherNode(File path){ 
    if(path.getParentFile()!=null){ 
      return getSonNode(path.getParentFile()); 
    }else{ 
      return null; 
    } 
  } 
   
  public List> getBrotherNode(String pathStr){ 
    File path=new File(pathStr); 
    return getBrotherNode(path); 
  } 
   
   
  public String getParentPath(File path){ 
    if(path.getParentFile()==null){ 
      return null; 
    }else{ 
      return path.getParent(); 
    } 
  } 
   
  public String getParentPath(String pathStr){ 
    File path=new File(pathStr); 
    if(path.getParentFile()==null){ 
      return null; 
    }else{ 
      return path.getParent(); 
    } 
  } 
 
   
  public String getSDPath(){ 
    String sdcard=Environment.getExternalStorageState(); 
    if(sdcard.equals(Environment.MEDIA_MOUNTED)){ 
      return Environment.getExternalStorageDirectory().getAbsolutePath(); 
    }else{ 
      return null; 
    } 
  } 
   
   
  public String getbasePath(){ 
    String basePath=getSDPath(); 
    if(basePath==null){ 
      return Environment.getDataDirectory().getAbsolutePath(); 
    }else{ 
      return basePath; 
    } 
  } 
   
   
  public String getFileSize(File path) throws IOException{ 
    if(path.exists()){ 
      DecimalFormat df = new DecimalFormat("#.00"); 
      String sizeStr=""; 
      FileInputStream fis=new FileInputStream(path); 
      long size=fis.available(); 
      fis.close(); 
      if(size<1024){ 
 sizeStr=size+"B"; 
      }else if(size<1048576){ 
 sizeStr=df.format(size/(double)1024)+"KB"; 
      }else if(size<1073741824){ 
 sizeStr=df.format(size/(double)1048576)+"MB"; 
      }else{ 
 sizeStr=df.format(size/(double)1073741824)+"GB"; 
      } 
      return sizeStr; 
    }else{ 
      return null; 
    } 
  } 
   
   
  public String getFileSize(String fpath){ 
    File path=new File(fpath); 
    if(path.exists()){ 
      DecimalFormat df = new DecimalFormat("#.00"); 
      String sizeStr=""; 
      long size=0; 
      try { 
 FileInputStream fis = new FileInputStream(path); 
 size=fis.available(); 
 fis.close(); 
      } catch (FileNotFoundException e) { 
 // TODO Auto-generated catch block 
 e.printStackTrace(); 
 return "未知大小"; 
      } catch (IOException e) { 
 // TODO Auto-generated catch block 
 e.printStackTrace(); 
 return "未知大小"; 
      } 
      if(size<1024){ 
 sizeStr=size+"B"; 
      }else if(size<1048576){ 
 sizeStr=df.format(size/(double)1024)+"KB"; 
      }else if(size<1073741824){ 
 sizeStr=df.format(size/(double)1048576)+"MB"; 
      }else{ 
 sizeStr=df.format(size/(double)1073741824)+"GB"; 
      } 
      return sizeStr; 
    }else{ 
      return "未知大小"; 
    } 
  } 
   
   
  public String getFileType(String fileName){ 
    if(fileName!=""&&fileName.length()>3){ 
      int dot=fileName.lastIndexOf("."); 
      if(dot>0){ 
 return fileName.substring(dot+1); 
      }else{ 
 return ""; 
      } 
    } 
    return ""; 
  } 
   
  public Comparator> defaultOrder() { 
     
    final String orderBy0=FILE_INFO_ISFOLDER; 
    final String orderBy1=FILE_INFO_TYPE; 
    final String orderBy2=FILE_INFO_NAME; 
     
    Comparator> order=new Comparator>() { 
 
      @Override 
      public int compare(Map lhs, Map rhs) { 
 // TODO Auto-generated method stub 
 int left0=lhs.get(orderBy0).equals(true)?0:1; 
 int right0=rhs.get(orderBy0).equals(true)?0:1; 
 if(left0==right0){ 
   String left1=lhs.get(orderBy1).toString(); 
   String right1=rhs.get(orderBy1).toString(); 
   if(left1.compareTo(right1)==0){ 
     String left2=lhs.get(orderBy2).toString(); 
     String right2=rhs.get(orderBy2).toString(); 
     return left2.compareTo(right2); 
   }else{ 
     return left1.compareTo(right1); 
   } 
 }else{ 
   return left0-right0; 
 } 
      } 
    }; 
 
    return order; 
  } 
   
} 

使用方法：List> list=GetFilesUtils.getInstance().getSonNode(file); //或其他方法
使用示例：

package wuwang.mypage.activity; 
 
import java.io.IOException; 
import java.util.ArrayList; 
import java.util.Collections; 
import java.util.HashMap; 
import java.util.List; 
import java.util.Map; 
 
import wuwang.ebookworm.R; 
import wuwang.tools.utils.GetFilesUtils; 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.view.View.OnClickListener; 
import android.widget.AdapterView; 
import android.widget.AdapterView.OnItemClickListener; 
import android.widget.ListView; 
import android.widget.SimpleAdapter; 
import android.widget.TextView; 
import android.widget.Toast; 
 
public class FolderActivity extends Activity implements OnItemClickListener,onClickListener { 
 
  private ListView folderLv; 
  private TextView foldernowTv; 
  private SimpleAdapter sAdapter; 
  private List> aList; 
  private String baseFile; 
   
  private TextView titleTv; 
   
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
    // TODO Auto-generated method stub 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.mypage_folder); 
    baseFile=GetFilesUtils.getInstance().getbasePath(); 
     
    titleTv=(TextView) findViewById(R.id.mtitle); 
    titleTv.setText("本地文件"); 
     
    folderLv=(ListView) findViewById(R.id.folder_list); 
    foldernowTv=(TextView) findViewById(R.id.folder_now); 
    foldernowTv.setText(baseFile); 
    foldernowTv.setonClickListener(this); 
    aList=new ArrayList>(); 
    sAdapter=new SimpleAdapter(this, aList,R.layout.listitem_folder, new String[]{"fImg","fName","fInfo"}, 
 new int[]{R.id.folder_img,R.id.folder_name,R.id.folder_info}); 
    folderLv.setAdapter(sAdapter); 
    folderLv.setonItemClickListener(this); 
    try { 
      loadFolderList(baseFile); 
    } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
    } 
  } 
   
  private void loadFolderList(String file) throws IOException{ 
    List> list=GetFilesUtils.getInstance().getSonNode(file); 
    if(list!=null){ 
      Collections.sort(list, GetFilesUtils.getInstance().defaultOrder()); 
      aList.clear(); 
      for(Map map:list){ 
 String fileType=(String) map.get(GetFilesUtils.FILE_INFO_TYPE); 
 Map gMap=new HashMap(); 
 if(map.get(GetFilesUtils.FILE_INFO_ISFOLDER).equals(true)){ 
   gMap.put("fIsDir", true); 
   gMap.put("fImg",R.drawable.filetype_folder ); 
   gMap.put("fInfo", map.get(GetFilesUtils.FILE_INFO_NUM_SONDIRS)+"个文件夹和"+ 
map.get(GetFilesUtils.FILE_INFO_NUM_SONFILES)+"个文件"); 
 }else{ 
   gMap.put("fIsDir", false); 
   if(fileType.equals("txt")||fileType.equals("text")){ 
     gMap.put("fImg", R.drawable.filetype_text); 
   }else{ 
     gMap.put("fImg", R.drawable.filetype_unknow); 
   } 
   gMap.put("fInfo","文件大小:"+GetFilesUtils.getInstance().getFileSize(map.get(GetFilesUtils.FILE_INFO_PATH).toString())); 
 } 
 gMap.put("fName", map.get(GetFilesUtils.FILE_INFO_NAME)); 
 gMap.put("fPath", map.get(GetFilesUtils.FILE_INFO_PATH)); 
 aList.add(gMap); 
      } 
    }else{ 
      aList.clear(); 
    } 
    sAdapter.notifyDataSetChanged(); 
    foldernowTv.setText(file); 
  } 
 
  @Override 
  public void onItemClick(AdapterView parent, View view, int position, 
      long id) { 
    // TODO Auto-generated method stub 
    try { 
      if(aList.get(position).get("fIsDir").equals(true)){ 
 loadFolderList(aList.get(position).get("fPath").toString()); 
      }else{ 
 Toast.makeText(this, "这是文件，处理程序待添加", Toast.LENGTH_SHORT).show(); 
      } 
    } catch (IOException e) { 
      // TODO Auto-generated catch block 
      e.printStackTrace(); 
    } 
  } 
 
  @Override 
  public void onClick(View v) { 
    // TODO Auto-generated method stub 
    if(v.getId()==R.id.folder_now){ 
      try { 
 String folder=GetFilesUtils.getInstance().getParentPath(foldernowTv.getText().toString()); 
 if(folder==null){ 
   Toast.makeText(this, "无父目录，待处理", Toast.LENGTH_SHORT).show(); 
 }else{ 
   loadFolderList(folder); 
 } 
      } catch (IOException e) { 
 // TODO Auto-generated catch block 
 e.printStackTrace(); 
      } 
    } 
  } 
   
} 

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