Is File Exist in Asset - Android App

Android examples for App:Assets File

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Description

Is File Exist in Asset

Demo Code

/*/*from  w w w  .jav  a2 s . c o  m*/
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2012, Chun Xu, zuojisi@gmail.com
 *
 * This file is part of SimpleWebServer.
 * 
 * SimpleWebServer is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * SimpleWebServer is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with SimpleWebServer.  If not, see <http://www.gnu.org/licenses/>.
 *
 * - Author: Chun Xu
 * - Contact: zuojisi@gmail.com
 * - License: GNU Lesser General Public License (LGPL)
 * - Blog and source code availability: http://sws.pupfly.com/
 */
//package com.java2s;
import java.io.IOException;
import java.io.InputStream;
import android.content.res.AssetManager;
import android.text.TextUtils.SimpleStringSplitter;

public class Main {
    public static boolean IsFileExist(AssetManager am, String uri) {
        String parentPath = GetParentPath(uri);
        String filename = GetFilename(uri);
        String[] files = List(am, parentPath);
        for (String s : files) {
            if (s.equals(filename)) {
                return true;
            }
        }
        return false;
    }

    public static String GetParentPath(String uri) {
        if (uri.equalsIgnoreCase("/")) {
            return "";
        }
        if (uri.endsWith("/")) {
            uri = uri.substring(0, uri.length() - 1);
        }
        if (uri.indexOf('/') < 0) {
            return "";
        }

        SimpleStringSplitter sss = new SimpleStringSplitter('/');
        sss.setString(uri);
        String tmp = "";
        String ret = "";
        while (sss.hasNext()) {
            tmp = sss.next();
            if (sss.hasNext() && tmp.trim().length() > 0) {
                ret += tmp.trim() + "/";
            }
        }
        if (ret.endsWith("/")) {
            ret = ret.substring(0, ret.length() - 1);
        }
        return ret;
    }

    public static String GetFilename(String uri) {
        if (uri.equalsIgnoreCase("/")) {
            return "/";
        }
        if (uri.endsWith("/")) {
            uri = uri.substring(0, uri.length() - 1);
        }
        if (uri.indexOf('/') < 0) {
            return uri;
        }

        SimpleStringSplitter sss = new SimpleStringSplitter('/');
        sss.setString(uri);
        String tmp = "";
        String ret = "";
        while (sss.hasNext()) {
            tmp = sss.next();
            if (tmp.trim().length() > 0) {
                ret = tmp.trim();
            }
        }
        return ret;
    }

    public static String[] List(AssetManager am, String uri) {
        uri = RemoveLastPathSeperator(uri);
        if (IsFolder(am, uri)) {
            try {
                return am.list(uri);
            } catch (IOException e) {
                return null;
            }
        } else {
            return null;
        }
    }

    public static String RemoveLastPathSeperator(String uri) {
        if (uri.endsWith("/")) {
            return uri.substring(0, uri.length() - 1);
        } else {
            return uri;
        }
    }

    public static boolean IsFolder(AssetManager am, String uri) {
        uri = RemoveLastPathSeperator(uri);
        try {

            InputStream is = am.open(uri);
            if (am.open(uri) == null) {
                return true;
            } else {
                is.close();
                is = null;
                return false;
            }
        } catch (IOException e) {
            return true;
        }
    }
}

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