Android ListActivity实现遍历文件列表，查看文档类文件

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<File> files = new ArrayList<File>();
		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<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.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;
	}
}

<?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"
	android:paddingLeft="8dip"
	android:paddingRight="8dip">
	
	<TextView android:id="@+id/addbook_current_folder" 
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:textColor="#FFF000"
		android:textSize="25sp"
		android:background="#000FFF"
		/>
	
	<ListView android:id="@android:id/list"
	    android:layout_width="fill_parent" 
	    android:layout_height="0dip"
	    android:layout_weight="1"
	    android:drawSelectorOnTop="false"/>
	    
    	
</LinearLayout>

<?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="25sp"
		android:textStyle="bold"
		/>
	<TextView android:id="@+id/addbook_info" 
		android:layout_width="wrap_content"
		android:layout_height="wrap_content"
		android:textColor="#FFF000"
		android:textSize="15sp"
		/>
</LinearLayout>

评论

1 楼 ljl497768172 2012-06-04  

怎么都喜欢留一部分让人猜啊...