1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package androidx.core.os; 18 19 import android.os.Build; 20 import android.os.Environment; 21 import android.util.Log; 22 23 import java.io.File; 24 import java.io.IOException; 25 26 /** 27 * Helper for accessing features in {@link Environment}. 28 */ 29 public final class EnvironmentCompat { 30 private static final String TAG = "EnvironmentCompat"; 31 32 /** 33 * Unknown storage state, such as when a path isn't backed by known storage 34 * media. 35 * 36 * @see #getStorageState(File) 37 */ 38 public static final String MEDIA_UNKNOWN = "unknown"; 39 40 /** 41 * Returns the current state of the storage device that provides the given 42 * path. 43 * 44 * @return one of {@link #MEDIA_UNKNOWN}, {@link Environment#MEDIA_REMOVED}, 45 * {@link Environment#MEDIA_UNMOUNTED}, 46 * {@link Environment#MEDIA_CHECKING}, 47 * {@link Environment#MEDIA_NOFS}, 48 * {@link Environment#MEDIA_MOUNTED}, 49 * {@link Environment#MEDIA_MOUNTED_READ_ONLY}, 50 * {@link Environment#MEDIA_SHARED}, 51 * {@link Environment#MEDIA_BAD_REMOVAL}, or 52 * {@link Environment#MEDIA_UNMOUNTABLE}. 53 */ 54 public static String getStorageState(File path) { 55 if (Build.VERSION.SDK_INT >= 19) { 56 return Environment.getStorageState(path); 57 } 58 59 try { 60 final String canonicalPath = path.getCanonicalPath(); 61 final String canonicalExternal = Environment.getExternalStorageDirectory() 62 .getCanonicalPath(); 63 64 if (canonicalPath.startsWith(canonicalExternal)) { 65 return Environment.getExternalStorageState(); 66 } 67 } catch (IOException e) { 68 Log.w(TAG, "Failed to resolve canonical path: " + e); 69 } 70 71 return MEDIA_UNKNOWN; 72 } 73 74 private EnvironmentCompat() {} 75 } 76
