Android ListActivity實(shí)現(xiàn)遍歷文件列表，查看文檔類文件

杰出天下 2012-01-09

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Java代碼

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; //當(dāng)前文件夾
private FileListAdapter fileList;
//文件過濾器，查找文件夾或文本文件
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);
}
//跳轉(zhuǎn)目錄
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);
}
}
//文件列表適配器
class FileListAdapter extends ArrayAdapter<File>{
private LayoutInflater mInflater;
boolean isRoot; //根目錄
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;
}
}

Java代碼

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas./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>

Java代碼

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas./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>

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