Java tutorial
//package com.java2s; import android.os.Environment; import android.text.TextUtils; public class Main { private static final String DATA_SDCARD_ROOT = "/data/sdcard"; public static boolean isInternal(String path) { return TextUtils.isEmpty(path) || path.startsWith(Environment.getRootDirectory() + "/media") || path.startsWith(getDataSDCardRoot()); } public static String getDataSDCardRoot() { return DATA_SDCARD_ROOT; } }