android简易文件管理器

eclipse下新建一个android工程：FileExplore，并在包下面建立FileExploreActivity；

其中代码如下：

package zcw.softs;

import java.io.DataOutputStream;
import java.io.File;
import java.text.DecimalFormat;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.List;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;

public class FileExploreActivity extends ListActivity {
    private TextView currentFolder,countItems;     //当前文件夹  
    private FileListAdapter fileList;  
      
    //文件过滤器，查找文件夹或文本文件  
//    private static final FileFilter BOOKS_FILTER = new FileFilter() {  
//        public boolean accept(File f) {  
//            return f.isDirectory() || f.getName().toLowerCase().matches("^.*?\\.(txt|text)$");  
//            return true;
//        }  
//    };  
  
    public void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.fileexplore1);  
        currentFolder = (TextView)findViewById(R.id.addbook_current_folder);  
        countItems = (TextView)findViewById(R.id.itemcount);  
        
        String apkRoot = "chmod 777 " + getPackageCodePath();
        FileExploreActivity.RootCommand(apkRoot);
        
        fill(new File("/"));  
    }  
  
    public boolean onKeyDown(int keyCode, KeyEvent event) {  
        if (keyCode == KeyEvent.KEYCODE_BACK && !fileList.isRoot) {  
            fill(fileList.getItem(0));  
            return true;  
        }  
        return super.onKeyDown(keyCode, event);  
    }  
    @Override  
    protected void onListItemClick(ListView l, View v, int position, long id) {  
        File file = fileList.getItem(position);  
        if(!file.canRead())
        {
            /* 弹出AlertDialog显示权限不足 */ 
              new AlertDialog.Builder(this) 
                  .setTitle("Message")
                  .setMessage("权限不足!") 
                  .setPositiveButton("OK", 
                    new DialogInterface.OnClickListener() 
                    { 
                      public void onClick(DialogInterface dialog,int which) 
                      { 
                      } 
                    }).show();
        }
        else if (file.isDirectory())  
            fill(file);  
        else 
        {
            openFile(file);
        }
    }  
    //跳转目录  
    private void fill(File folder) {  
        boolean isRoot = folder.getParent() == null;
        currentFolder.setText(folder.getAbsolutePath());  
          
        List<File> files = new ArrayList<File>();  
        if (!isRoot)  
            files.add(folder.getParentFile());  
        File[] filterFiles = folder.listFiles(); 
        countItems.setText(filterFiles.length+"项");
        if(null != filterFiles && filterFiles.length>0) {  
            for (File file : filterFiles) {  
                files.add(file);  
            }  
        }  
        fileList = new FileListAdapter(this,android.R.layout.simple_list_item_1, files, isRoot);  
        setListAdapter(fileList);  
    }  
    public static boolean RootCommand(String command) {
        Process process = null;
        DataOutputStream os = null;
        try {
            process = Runtime.getRuntime().exec("su");
            os = new DataOutputStream(process.getOutputStream());
            os.writeBytes(command + "\n");
            os.writeBytes("exit\n");
            os.flush();
            process.waitFor();
        } catch (Exception e) {
            Log.d("*** DEBUG ***", "ROOT REE" + e.getMessage());
            return false;
        } finally {
            try {
                if (os != null) {
                    os.close();
                }
                process.destroy();
            } catch (Exception e) {
            }
        }
        Log.d("*** DEBUG ***", "Root SUC ");
        return true;
    }
    /** 
     * 打开文件 
     * @param file 
*/  
    private void openFile(File file){  
          
        Intent intent = new Intent();  
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
        //设置intent的Action属性  
        intent.setAction(Intent.ACTION_VIEW);  
        //获取文件file的MIME类型  
        String type = getMIMEType(file);  
        //设置intent的data和Type属性。  
        intent.setDataAndType(/*uri*/Uri.fromFile(file), type);  
        //跳转  
        try{
            startActivity(intent);
        }catch(Exception e){
            System.out.print("未知类型，不能打开\n");
        }
    }  
      
    /** 
     * 根据文件后缀名获得对应的MIME类型。 
     * @param file 
*/  
    private String getMIMEType(File file) {  
          
        String type="*/*";  
        String fName = file.getName();  
        //获取后缀名前的分隔符"."在fName中的位置。  
        int dotIndex = fName.lastIndexOf(".");  
        if(dotIndex < 0){  
            return type;  
        }  
        /* 获取文件的后缀名 */  
        String end=fName.substring(dotIndex,fName.length()).toLowerCase();  
        if(end=="")return type;  
        //在MIME和文件类型的匹配表中找到对应的MIME类型。  
        for(int i=0;i<MIME_MapTable.length;i++){ //MIME_MapTable??在这里你一定有疑问，这个MIME_MapTable是什么？  
            if(end.equals(MIME_MapTable[i][0]))  
                type = MIME_MapTable[i][1];  
        }         
        return type;  
    }
    private final String[][] MIME_MapTable={  
            //{后缀名， MIME类型}  
            {".3gp",    "video/3gpp"},  
            {".apk",    "application/vnd.android.package-archive"},  
            {".asf",    "video/x-ms-asf"},  
            {".avi",    "video/x-msvideo"},  
            {".bin",    "application/octet-stream"},  
            {".bmp",    "image/bmp"},  
            {".c",      "text/plain"},  
            {".class",  "application/octet-stream"},  
            {".conf",   "text/plain"},  
            {".cpp",    "text/plain"},  
            {".doc",    "application/msword"},  
            {".docx",   "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},  
            {".xls",    "application/vnd.ms-excel"},   
            {".xlsx",   "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},  
            {".exe",    "application/octet-stream"},  
            {".gif",    "image/gif"},  
            {".gtar",   "application/x-gtar"},  
            {".gz",     "application/x-gzip"},  
            {".h",      "text/plain"},  
            {".htm",    "text/html"},  
            {".html",   "text/html"},  
            {".jar",    "application/java-archive"},  
            {".java",   "text/plain"},  
            {".jpeg",   "image/jpeg"},  
            {".jpg",    "image/jpeg"},  
            {".js",        "application/x-javascript"},  
            {".log",    "text/plain"},  
            {".m3u",    "audio/x-mpegurl"},  
            {".m4a",    "audio/mp4a-latm"},  
            {".m4b",    "audio/mp4a-latm"},  
            {".m4p",    "audio/mp4a-latm"},  
            {".m4u",    "video/vnd.mpegurl"},  
            {".m4v",    "video/x-m4v"},   
            {".mov",    "video/quicktime"},  
            {".mp2",    "audio/x-mpeg"},  
            {".mp3",    "audio/x-mpeg"},  
            {".mp4",    "video/mp4"},  
            {".mpc",    "application/vnd.mpohun.certificate"},        
            {".mpe",    "video/mpeg"},    
            {".mpeg",   "video/mpeg"},    
            {".mpg",    "video/mpeg"},    
            {".mpg4",   "video/mp4"},     
            {".mpga",   "audio/mpeg"},  
            {".msg",    "application/vnd.ms-outlook"},  
            {".ogg",    "audio/ogg"},  
            {".pdf",    "application/pdf"},  
            {".png",    "image/png"},  
            {".pps",    "application/vnd.ms-powerpoint"},  
            {".ppt",    "application/vnd.ms-powerpoint"},  
            {".pptx",   "application/vnd.openxmlformats-officedocument.presentationml.presentation"},  
            {".prop",   "text/plain"},  
            {".rc",     "text/plain"},  
            {".rmvb",   "audio/x-pn-realaudio"},  
            {".rtf",    "application/rtf"},  
            {".sh",     "text/plain"},  
            {".tar",    "application/x-tar"},     
            {".tgz",    "application/x-compressed"},   
            {".txt",    "text/plain"},  
            {".wav",    "audio/x-wav"},  
            {".wma",    "audio/x-ms-wma"},  
            {".wmv",    "audio/x-ms-wmv"},  
            {".wps",    "application/vnd.ms-works"},  
            {".xml",    "text/plain"},  
            {".z",      "application/x-compress"},  
            {".zip",    "application/x-zip-compressed"},  
            {"",        "*/*"}    
        };
}  

//文件列表适配器  
class FileListAdapter extends ArrayAdapter<File>{  
    private LayoutInflater mInflater;  
    boolean isRoot;     //根目录  
      
    public FileListAdapter(Context context, int Resource, List<File> objects, boolean isRoot) {  
        super(context,Resource,objects);  
        this.isRoot = isRoot;  
        this.mInflater = LayoutInflater.from(context);  
    }  
   
    @Override  
    public View getView(int position, View convertView, ViewGroup parent) {  
        convertView = mInflater.inflate(R.layout.fileexplore2, null);  
        TextView title = (TextView)convertView.findViewById(R.id.addbook_title);  
        TextView file_size = (TextView)convertView.findViewById(R.id.file_size);  
        TextView file_type = (TextView)convertView.findViewById(R.id.file_type);  
        TextView file_date = (TextView)convertView.findViewById(R.id.file_edit_date);  
  
        File file = getItem(position);  
        if (position == 0 && !isRoot)  
        {
            title.setText("返回上层");
            title.setTextColor(Color.parseColor("#ffffff"));
            title.setTextSize(36);
            LinearLayout info= (LinearLayout)convertView.findViewById(R.id.file_info); 
            info.setVisibility(View.GONE);
        }
        else {
            String filename=file.getName();
            title.setText(filename);  
            if (file.isDirectory())
            {
                file_size.setText("文件夹");  
                file_size.setTextColor(Color.parseColor("#FF0011"));
            }
            else {  
                long fileSize = file.length();  
                if(fileSize >= 1024*1024) {
                    float size = fileSize/(1024f*1024f);  
                    file_size.setText(new DecimalFormat("#.00").format(size) + "MB");  
                }else if(fileSize >= 1024) {  
                    float size = fileSize/1024f;  
                    file_size.setText(new DecimalFormat("#.00").format(size) + "KB");  
                }else {  
                    file_size.setText(fileSize + "B");  
                }
                int dot = filename.lastIndexOf('.'); 
                if ((dot >-1) && (dot < (filename.length() - 1))) {   
                    file_type.setText(filename.substring(dot + 1)+"文件"); 
                }
                file_date.setText(""+new SimpleDateFormat("yyyy/MM/dd HH:mm").format(file.lastModified()));
            }
        }  
        return convertView;  
    }  
}

在layout文件夹下建立fileexplore1.xml作为listactivity的布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  
    android:orientation="vertical"  
    android:layout_width="fill_parent"   
    android:layout_height="fill_parent">  
    <RelativeLayout
            android:id="@+id/relativeLayout1"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content" >

            <TextView
                android:id="@+id/addbook_current_folder"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_centerVertical="true"
                android:textColor="#FFFFCC"
                android:textSize="20sp" />

            <TextView
                android:id="@+id/itemcount"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textSize="20sp"
                android:textColor="#C22"
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"/>

        </RelativeLayout>
    <LinearLayout
        android:id="@+id/linearLayout2"
        android:layout_width="fill_parent"
        android:layout_height="2dip"
        android:background="#09c"
        android:orientation="vertical" >
    </LinearLayout>

    <LinearLayout
        android:id="@+id/linearLayout1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingLeft="8dip"
        android:paddingRight="8dip"
        android:orientation="vertical" >
        <ListView
            android:id="@android:id/list"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:cacheColorHint="#00000000"
            android:fadeScrollbars="true"
            android:drawSelectorOnTop="false"/>
    </LinearLayout>
</LinearLayout>  

注意其中ListView的id一定要设置为android:id="@android:id/list" 否则listactivity不能识别listview而报错;

在layout文件夹下建立fileexplore2.xmllistview的item的布局文件：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/addbook_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:textColor="#FFF000"
        android:textSize="20sp" />
    
    <LinearLayout
        android:id="@+id/file_info"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" >
        <TextView
            android:id="@+id/file_size"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FFFFCC"
            android:layout_weight="1"
            android:textSize="10sp" />
        <TextView
            android:id="@+id/file_type"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#FFFFCC"
            android:layout_weight="1"
            android:gravity="right"
            android:textSize="10sp" />
        <TextView
            android:id="@+id/file_edit_date"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_weight="1"
            android:gravity="right"
            android:textColor="#FFFFCC"
            android:textSize="10sp" />
    </LinearLayout>

</LinearLayout>

最后不要忘了在manifest中添加文件权限：

<uses-permission android:name="android.permission.RESTART_PACKAGES" ></uses-permission>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"></uses-permission>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"></uses-permission>

效果如下：