android简易文件管理器的用法

　　很久没有写东西了，鉴于某某同学文件管理器不会，这里简单介绍一下，同时写一个demon，参考了网上别人写的代码，自己也学习学习，研究研究。

　　首先所谓文件管理器，看起来就是一个列表，列表里面是文件夹或者文件，首先把布局写出来，我想在最上方的左边显示文件的路径，右边显示该路径下的文件个数，其实还是一个遍历文件，然后用列表显示出来的问题。下面是ListView，用来显示文件列表。下面是运行的效果图：

主界面的布局文件如下:

<?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" >
    <RelativeLayout 
        android:id="@+id/top"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
       <TextView 
           android:id="@+id/path"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_alignParentLeft="true"
           android:layout_centerVertical="true"
           android:textSize="@*android:dimen/list_item_size"
           android:textColor="@android:color/white"/>
        
        <TextView 
            android:id="@+id/item_count"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="@*android:dimen/list_item_size"
            android:textColor="@android:color/white"
            android:layout_alignParentRight="true"
            android:layout_centerVertical="true"/>
    </RelativeLayout>
   <View 
        android:layout_width="match_parent"
        android:layout_height="2dip"
        android:background="#09c"/>

   <LinearLayout
        android:orientation="vertical"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
        
        <ListView 
            android:id="@+id/file_list"
            android:layout_height="match_parent"
            android:layout_width="match_parent"
            android:fadingEdge="none"
            android:cacheColorHint="@android:color/transparent"/>
    </LinearLayout>
</LinearLayout>

首先在oncreate方法里面调用一个方法去获取布局文件里面的id：

@Override
    protected void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.file_manager);
        initView();
    }

initView之后添加apk的权限，777 表示可读可写可操作。

private void initView() {
        mListView = (ListView) findViewById(R.id.file_list);
        mPathView = (TextView) findViewById(R.id.path);
        mItemCount = (TextView) findViewById(R.id.item_count);
        mListView.setOnItemClickListener(this);
        String apkRoot = "chmod 777 " + getPackageCodePath(); 
        RootCommand(apkRoot);
        File folder = new File("/");
        initData(folder);
    }

修改Root权限的方法：

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) {
            return false;
        }
        finally {
            try {
                if (os != null) {
                    os.close();
                }
                process.destroy();
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }
        return true;
    }

完了之后我们要获取根目录下面的所有的数据，然后设置到我们的ListView中让它显示出来。

 private void initData(File folder) {
        boolean isRoot = folder.getParent() == null; 
        mPathView.setText(folder.getAbsolutePath());  
        ArrayList<File> files = new ArrayList<File>();   
        if (!isRoot) {
            files.add(folder.getParentFile());  
        }
        File[] filterFiles = folder.listFiles();  
        mItemCount.setText(filterFiles.length + "项"); 
        if (null != filterFiles && filterFiles.length > 0) {
            for (File file : filterFiles) {
                files.add(file);
            }
        }
        mFileAdpter = new FileListAdapter(this, files, isRoot);  
        mListView.setAdapter(mFileAdpter);
    }

首先是获取当前是否是根目录，然后把文件的路径设置给我们要显示的View。

然后用一个ArrayList来装我们目录下的所有的文件或者文件夹。

首先要把这个文件夹的父类装到我们的列表中去，然后把这个文件夹下的子文件都拿到，也装在列表中，然后调用Adapter显示出来。既然说到了Adapter, 那就看下Adapter吧。

private class FileListAdapter extends BaseAdapter {

        private Context context;
        private ArrayList<File> files;
        private boolean isRoot;
        private LayoutInflater mInflater;
        
        public FileListAdapter (Context context, ArrayList<File> files, boolean isRoot) {
            this.context = context;
            this.files = files;
            this.isRoot = isRoot;
            mInflater = LayoutInflater.from(context);
        }
        
        @Override
        public int getCount () {
            return files.size();
        }

        @Override
        public Object getItem (int position) {
            return files.get(position);
        }

        @Override
        public long getItemId (int position) {
            return position;
        }
        
        @Override
        public View getView (int position, View convertView, ViewGroup parent) {
            ViewHolder viewHolder;
            if(convertView == null) {
                viewHolder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.file_list_item, null);
                convertView.setTag(viewHolder);
                viewHolder.title = (TextView) convertView.findViewById(R.id.file_title);
                viewHolder.type = (TextView) convertView.findViewById(R.id.file_type);
                viewHolder.data = (TextView) convertView.findViewById(R.id.file_date);
                viewHolder.size = (TextView) convertView.findViewById(R.id.file_size);
            } else {
                viewHolder = (ViewHolder) convertView.getTag();
            }
            
            File file = (File) getItem(position);
            if(position == 0 && !isRoot) {
                viewHolder.title.setText("返回上一级");
                viewHolder.data.setVisibility(View.GONE);
                viewHolder.size.setVisibility(View.GONE);
                viewHolder.type.setVisibility(View.GONE);
            } else {
                String fileName = file.getName();
                viewHolder.title.setText(fileName);
                if(file.isDirectory()) {
                    viewHolder.size.setText("文件夹");
                    viewHolder.size.setTextColor(Color.RED);
                    viewHolder.type.setVisibility(View.GONE);
                    viewHolder.data.setVisibility(View.GONE);
                } else {
                    long fileSize = file.length();
                    if(fileSize > 1024*1024) {
                        float size = fileSize /(1024f*1024f);
                        viewHolder.size.setText(new DecimalFormat("#.00").format(size) + "MB");
                    } else if(fileSize >= 1024) {
                        float size = fileSize/1024;
                        viewHolder.size.setText(new DecimalFormat("#.00").format(size) + "KB");
                    } else {
                        viewHolder.size.setText(fileSize + "B");
                    }
                    int dot = fileName.indexOf('.');
                    if(dot > -1 && dot < (fileName.length() -1)) {
                        viewHolder.type.setText(fileName.substring(dot + 1) + "文件");
                    }
                    viewHolder.data.setText(new SimpleDateFormat("yyyy/MM/dd HH:mm").format(file.lastModified()));
                }
            }
            return convertView;
        }
        
        class ViewHolder {
            private TextView title;
            private TextView type;
            private TextView data;
            private TextView size;
        }
    }

 看下adapter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="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <TextView 
           android:id="@+id/file_title"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:textSize="25sp"
           android:textColor="#fff000"/>
    <LinearLayout 
        android:id="@+id/file_info"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <TextView 
            android:id="@+id/file_size"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:textColor="#ffffcc"
            android:layout_weight="1"
            android:textSize="18sp"/>
        
        <TextView 
            android:id="@+id/file_type"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:textColor="#ffffcc"
            android:layout_weight="1"
            android:gravity="right"
            android:textSize="18sp"/>
        <TextView 
            android:id="@+id/file_date"
            android:layout_width="0dip"
            android:layout_height="wrap_content"
            android:textColor="#ffffff"
            android:layout_weight="1"
            android:gravity="right"
            android:textSize="18sp"/>
    </LinearLayout>
</LinearLayout>

列表的Item项分2行显示，上面一行显示文件名

下面一行分别显示文件大小，文件类型，文件修改时间。

我们可以通过File file = (File) getItem(position);拿到Item项的文件，如果是在第一个并且不再根目录我们就把第一个也就是parentFile显示为：“返回上一级”，下一行的都隐藏掉。

如果不是第一个位置，可以拿到这个文件的一系列信息。

先把String fileName = file.getName();文件名拿到，显示出来。

如果这个文件是一个文件夹，就把文件的大小显示为“文件夹”，类型和修改时间隐藏掉。

如果不是一个文件夹， 可以拿到文件的长度long fileSize = file.length();

根据特定的长度显示文件的大小，B， KB， MB， GB等。

然后拿到文件的类型，通过最后一个“.”之后的字符串就是该文件的类型。

通过viewHolder.data.setText(new SimpleDateFormat("yyyy/MM/dd HH:mm").format(file.lastModified())); 设置文件的最近修改时间。

然后可以设置每个Item项的点击事件，如下所示：

 @Override
    public void onItemClick (AdapterView<?> parent, View view, int position, long id) {
        File file = (File) mFileAdpter.getItem(position);
        if(!file.canRead()) {
            new AlertDialog.Builder(this).setTitle("提示").setMessage("权限不足").setPositiveButton(android.R.string.ok, new OnClickListener() {
                
                @Override
                public void onClick (DialogInterface dialog, int which) {
                    
                }
            }).show();
        } else if(file.isDirectory()) {
            initData(file);
        } else {
            openFile(file);
        }
    }

如果这个文件不能读，就弹出对话框显示“权限不足”。

如果是一个文件夹，就在调用一次显示所有文件的方法：initData(file);把这个文件夹作为参数传递下去。

如果是一个文件，就可以调用打开文件的方法打开这个文件。

如何打开文件呢？

可以根据不同的文件的后缀名找到不同的文件类型：

可以用一个二维数组把一些常用的文件类型封装起来。如下：

 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" }, 
        { "", "*/*" } 
        };

分别对应的是后缀名和对应的文件类型。

我们可以根据文件的后缀名拿到文件的MIMEType类型：

private String getMIMEType(File file) {
        String type = "*/*";
        String fileName = file.getName();
        int dotIndex = fileName.indexOf('.');
        if(dotIndex < 0) {
            return type;
        }
        String end = fileName.substring(dotIndex, fileName.length()).toLowerCase();
        if(end == "") {
            return type;
        }
        for(int i=0; i<MIME_MapTable.length; i++) {
            if(end == MIME_MapTable[i][0]) {
                type = MIME_MapTable[i][1] ;
            }
        }
        return type;
    }

先遍历后缀名，如果找到，就把对应的类型找到并返回。

拿到了类型，就可以打开这个文件。

用这个intent.setDataAndType(Uri.fromFile(file), type); 打开设置打开文件的类型。

如果type是*/*会弹出所有的可供选择的应用程序。

到这里一个简易的文件管理器就成型了。。。

源代码：

package com.android.test;

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

import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.DialogInterface.OnClickListener;
import android.graphics.Color;
import android.net.Uri;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.BaseAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class FileManager extends Activity implements OnItemClickListener {
    
    private ListView mListView;
    private TextView mPathView;
    private FileListAdapter mFileAdpter;
    private TextView mItemCount;
    
    @Override
    protected void onCreate (Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.file_manager);
        initView();
    }
    
    private void initView() {
        mListView = (ListView) findViewById(R.id.file_list);
        mPathView = (TextView) findViewById(R.id.path);
        mItemCount = (TextView) findViewById(R.id.item_count);
        mListView.setOnItemClickListener(this);
        String apkRoot = "chmod 777 " + getPackageCodePath(); 
        RootCommand(apkRoot);
        File folder = new File("/");
        initData(folder);
    }
    
    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) {
            return false;
        }
        finally {
            try {
                if (os != null) {
                    os.close();
                }
                process.destroy();
            }
            catch (Exception e) {
                e.printStackTrace();
            }
        }
        return true;
    }
    
    private void initData(File folder) {
        boolean isRoot = folder.getParent() == null; 
        mPathView.setText(folder.getAbsolutePath());  
        ArrayList<File> files = new ArrayList<File>();   
        if (!isRoot) {
            files.add(folder.getParentFile());  
        }
        File[] filterFiles = folder.listFiles();  
        mItemCount.setText(filterFiles.length + "项"); 
        if (null != filterFiles && filterFiles.length > 0) {
            for (File file : filterFiles) {
                files.add(file);
            }
        }
        mFileAdpter = new FileListAdapter(this, files, isRoot);  
        mListView.setAdapter(mFileAdpter);
    }
    
    private class FileListAdapter extends BaseAdapter {

        private Context context;
        private ArrayList<File> files;
        private boolean isRoot;
        private LayoutInflater mInflater;
        
        public FileListAdapter (Context context, ArrayList<File> files, boolean isRoot) {
            this.context = context;
            this.files = files;
            this.isRoot = isRoot;
            mInflater = LayoutInflater.from(context);
        }
        
        @Override
        public int getCount () {
            return files.size();
        }

        @Override
        public Object getItem (int position) {
            return files.get(position);
        }

        @Override
        public long getItemId (int position) {
            return position;
        }
        
        @Override
        public View getView (int position, View convertView, ViewGroup parent) {
            ViewHolder viewHolder;
            if(convertView == null) {
                viewHolder = new ViewHolder();
                convertView = mInflater.inflate(R.layout.file_list_item, null);
                convertView.setTag(viewHolder);
                viewHolder.title = (TextView) convertView.findViewById(R.id.file_title);
                viewHolder.type = (TextView) convertView.findViewById(R.id.file_type);
                viewHolder.data = (TextView) convertView.findViewById(R.id.file_date);
                viewHolder.size = (TextView) convertView.findViewById(R.id.file_size);
            } else {
                viewHolder = (ViewHolder) convertView.getTag();
            }
            
            File file = (File) getItem(position);
            if(position == 0 && !isRoot) {
                viewHolder.title.setText("返回上一级");
                viewHolder.data.setVisibility(View.GONE);
                viewHolder.size.setVisibility(View.GONE);
                viewHolder.type.setVisibility(View.GONE);
            } else {
                String fileName = file.getName();
                viewHolder.title.setText(fileName);
                if(file.isDirectory()) {
                    viewHolder.size.setText("文件夹");
                    viewHolder.size.setTextColor(Color.RED);
                    viewHolder.type.setVisibility(View.GONE);
                    viewHolder.data.setVisibility(View.GONE);
                } else {
                    long fileSize = file.length();
                    if(fileSize > 1024*1024) {
                        float size = fileSize /(1024f*1024f);
                        viewHolder.size.setText(new DecimalFormat("#.00").format(size) + "MB");
                    } else if(fileSize >= 1024) {
                        float size = fileSize/1024;
                        viewHolder.size.setText(new DecimalFormat("#.00").format(size) + "KB");
                    } else {
                        viewHolder.size.setText(fileSize + "B");
                    }
                    int dot = fileName.indexOf('.');
                    if(dot > -1 && dot < (fileName.length() -1)) {
                        viewHolder.type.setText(fileName.substring(dot + 1) + "文件");
                    }
                    viewHolder.data.setText(new SimpleDateFormat("yyyy/MM/dd HH:mm").format(file.lastModified()));
                }
            }
            return convertView;
        }
        
        class ViewHolder {
            private TextView title;
            private TextView type;
            private TextView data;
            private TextView size;
        }
    }

    @Override
    public void onItemClick (AdapterView<?> parent, View view, int position, long id) {
        File file = (File) mFileAdpter.getItem(position);
        if(!file.canRead()) {
            new AlertDialog.Builder(this).setTitle("提示").setMessage("权限不足").setPositiveButton(android.R.string.ok, new OnClickListener() {
                
                @Override
                public void onClick (DialogInterface dialog, int which) {
                    
                }
            }).show();
        } else if(file.isDirectory()) {
            initData(file);
        } else {
            openFile(file);
        }
    }
    
    private void openFile(File file) {
        Intent intent = new Intent();
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);  
        intent.setAction(Intent.ACTION_VIEW);  
        String type = getMIMEType(file);  
        intent.setDataAndType(Uri.fromFile(file), type);  
        try {
            startActivity(intent);
        }
        catch (Exception e) {
            Toast.makeText(this, "未知类型，不能打开", Toast.LENGTH_SHORT).show();
        }
    }
    
    private String getMIMEType(File file) {
        String type = "*/*";
        String fileName = file.getName();
        int dotIndex = fileName.indexOf('.');
        if(dotIndex < 0) {
            return type;
        }
        String end = fileName.substring(dotIndex, fileName.length()).toLowerCase();
        if(end == "") {
            return type;
        }
        for(int i=0; i<MIME_MapTable.length; i++) {
            if(end == 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" }, 
        { "", "*/*" } 
        };
}

  最后补充一下，布局文件中的dimension是编译到jar包里面去了的，没有jar包的童鞋可以改成自己定义大小。。