Here you can find the source of isExternalStorageAvailable()
public static boolean isExternalStorageAvailable()
//package com.java2s; /**/*from ww w. ja v a2 s . c o m*/ * Copyright (c) 2013-2014, Rinc Liu (http://rincliu.com). * * 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.Build; import android.os.Environment; public class Main { /** * @return */ public static boolean isExternalStorageAvailable() { return Environment.MEDIA_MOUNTED.equals(Environment .getExternalStorageState()) || !isExternalStorageRemovable(); } /** * @return */ static boolean isExternalStorageRemovable() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) { return Environment.isExternalStorageRemovable(); } return true; } }