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<Map<String, Object>> getSonnode(File path){ 
    if(path.isDirectory()){ 
      List<Map<String, Object>> list=new ArrayList<Map<String,Object>>(); 
      File[] files=path.listFiles(); 
      if(files!=null){ 
        for(int i=0;i<files.length;i++){ 
          Map<String, Object> fileInfo=new HashMap<String, Object>(); 
          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<bFiles.length;j++){ 
                if(bFiles[j].isDirectory()){ 
                  getNumOfDir++; 
                } 
              } 
              fileInfo.put(FILE_INFO_NUM_SONDIRS, getNumOfDir); 
              fileInfo.put(FILE_INFO_NUM_SONFILES, bFiles.length-getNumOfDir); 
            } 
            fileInfo.put(FILE_INFO_TYPE, FILE_TYPE_FOLDER); 
          }else{ 
            fileInfo.put(FILE_INFO_ISFOLDER, false); 
            fileInfo.put(FILE_INFO_NUM_SONDIRS, 0); 
            fileInfo.put(FILE_INFO_NUM_SONFILES, 0); 
            fileInfo.put(FILE_INFO_TYPE, getFileType(files[i].getName())); 
          } 
          fileInfo.put(FILE_INFO_PATH, files[i].getAbsoluteFile()); 
          list.add(fileInfo); 
        } 
        return list; 
      }else{ 
        return null; 
      } 
    }else{ 
      return null; 
    } 
  } 
   
  public List<Map<String, Object>> getSonNode(String pathStr){ 
    File path=new File(pathStr); 
    return getSonNode(path); 
  } 
   
  public List<Map<String, Object>> getBrotherNode(File path){ 
    if(path.getParentFile()!=null){ 
      return getSonNode(path.getParentFile()); 
    }else{ 
      return null; 
    } 
  } 
   
  public List<Map<String, Object>> 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<Map<String, Object>> defaultOrder() { 
    final String orderBy0=FILE_INFO_ISFOLDER; 
    final String orderBy1=FILE_INFO_TYPE; 
    final String orderBy2=FILE_INFO_NAME; 
    Comparator<Map<String, Object>> order=new Comparator<Map<String,Object>>() { 
      @Override 
      public int compare(Map<String, Object> lhs, Map<String, Object> 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<Map<String, Object>> 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<Map<String, Object>> 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<Map<String,Object>>(); 
    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<Map<String, Object>> list=GetFilesUtils.getInstance().getSonNode(file); 
    if(list!=null){ 
      Collections.sort(list, GetFilesUtils.getInstance().defaultOrder()); 
      aList.clear(); 
      for(Map<String, Object> map:list){ 
        String fileType=(String) map.get(GetFilesUtils.FILE_INFO_TYPE); 
        Map<String,Object> gMap=new HashMap<String, Object>(); 
        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(); 
      } 
    } 
  } 
} 

页面的布局文件为：

<?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" 
  android:background="@color/frame_main_bg" > 
  <include layout="@layout/mypage_title_folder"/> 
  <TextView android:layout_width="match_parent" 
    android:layout_height="40dp" 
    android:textColor="#FFFFFF" 
    android:textSize="16sp" 
    android:gravity="center_vertical" 
    android:ellipsize="start" 
    android:singleLine="true" 
    android:drawableLeft="@drawable/folder_backupimg" 
    android:paddingLeft="10dp" 
    android:drawablePadding="10dp" 
    android:id="@+id/folder_now" 
    android:background="@color/frame_title_bg_clk_color" /> 
  <ListView android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:id="@+id/folder_list" 
    android:dividerHeight="1dp" 
    android:divider="@color/folder_list_divider" > 
  </ListView> 
</LinearLayout> 

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