package com.shawn.zp.reader.activity; import java.io.File; import java.io.FileFilter; import java.text.DecimalFormat; import java.util.ArrayList; import java.util.List; import android.app.ListActivity; import android.content.Context; import android.os.Bundle; import android.view.KeyEvent; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.ListView; import android.widget.TextView; public class AddBookActivity extends ListActivity{
   private TextView currentFolder;        //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)$");         }     }; public void onCreate(Bundle savedInstanceState) {
   super.onCreate(savedInstanceState);         setContentView(R.layout.layout_addbook_directory);         currentFolder = (TextView)findViewById(R.id.addbook_current_folder);         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.isDirectory())             fill(file);     } //跳转目录     private void fill(File folder) {
   boolean isRoot = folder.getParent() == null;         currentFolder.setText(AddBookActivity.this.getResources().getString(R.string.addbook_current_folder) + folder.getAbsolutePath());         List
     
       files = new ArrayList
      
       (); if (!isRoot)             files.add(folder.getParentFile());         File[] filterFiles = folder.listFiles(BOOKS_FILTER); if(null != filterFiles && filterFiles.length>0) {
   for (File file : filterFiles) {
                   files.add(file);             }         }         fileList = new FileListAdapter(this, R.layout.layout_addbook_file, files, isRoot);         setListAdapter(fileList);     } } //文件列表适配器 class FileListAdapter extends ArrayAdapter
       
        {
   private LayoutInflater mInflater; boolean isRoot;        //根目录     public FileListAdapter(Context context, int Resource, List
        
          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.layout_addbook_file, null);         TextView title = (TextView)convertView.findViewById(R.id.addbook_title);         TextView info = (TextView)convertView.findViewById(R.id.addbook_info);         File file = getItem(position); if (position == 0 && !isRoot)             title.setText(R.string.addbook_parent_folder); else {
               title.setText(file.getName()); if (file.isDirectory())                 info.setText(R.string.addbook_directory); else {
   long fileSize = file.length(); if(fileSize >= 1024*1024) {
   float size = fileSize/(1024f*1024f);                     info.setText(new DecimalFormat("#.00").format(size) + "MB");                 }else if(fileSize >= 1024) {
   float size = fileSize/1024f;                     info.setText(new DecimalFormat("#.00").format(size) + "KB");                 }else {
                       info.setText(fileSize + "B");                 }             }         } return convertView;     } }