Java tutorial
//package com.java2s; /* * Copyright (C) 2008 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.os.Environment; import java.io.File; public class Main { /** * Checks whether the filename looks legitimate */ static boolean isFilenameValid(String filename, File downloadsDataDir) { filename = filename.replaceFirst("/+", "/"); // normalize leading slashes return filename.startsWith(Environment.getDownloadCacheDirectory().toString()) || filename.startsWith(downloadsDataDir.toString()) || filename.startsWith(Environment.getExternalStorageDirectory().toString()); } }