106 lines
3.6 KiB
Java
106 lines
3.6 KiB
Java
/*
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/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.emailcommon;
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import com.android.emailcommon.utility.Utility;
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import android.content.Context;
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import android.telephony.TelephonyManager;
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import android.util.Log;
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import java.io.BufferedReader;
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import java.io.BufferedWriter;
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import java.io.File;
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import java.io.FileReader;
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import java.io.FileWriter;
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import java.io.IOException;
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public class Device {
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private static String sDeviceId = null;
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/**
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* EAS requires a unique device id, so that sync is possible from a variety of different
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* devices (e.g. the syncKey is specific to a device) If we're on an emulator or some other
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* device that doesn't provide one, we can create it as android<n> where <n> is system time.
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* This would work on a real device as well, but it would be better to use the "real" id if
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* it's available
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*/
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static public synchronized String getDeviceId(Context context) throws IOException {
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if (sDeviceId == null) {
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sDeviceId = getDeviceIdInternal(context);
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}
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return sDeviceId;
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}
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static private String getDeviceIdInternal(Context context) throws IOException {
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if (context == null) {
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throw new IllegalStateException("getDeviceId requires a Context");
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}
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File f = context.getFileStreamPath("deviceName");
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BufferedReader rdr = null;
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String id;
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if (f.exists()) {
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if (f.canRead()) {
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rdr = new BufferedReader(new FileReader(f), 128);
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id = rdr.readLine();
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rdr.close();
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return id;
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} else {
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Log.w(Logging.LOG_TAG, f.getAbsolutePath() + ": File exists, but can't read?" +
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" Trying to remove.");
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if (!f.delete()) {
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Log.w(Logging.LOG_TAG, "Remove failed. Tring to overwrite.");
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}
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}
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}
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BufferedWriter w = new BufferedWriter(new FileWriter(f), 128);
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final String consistentDeviceId = getConsistentDeviceId(context);
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if (consistentDeviceId != null) {
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// Use different prefix from random IDs.
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id = "androidc" + consistentDeviceId;
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} else {
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id = "android" + System.currentTimeMillis();
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}
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w.write(id);
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w.close();
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return id;
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}
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/**
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* @return Device's unique ID if available. null if the device has no unique ID.
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*/
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public static String getConsistentDeviceId(Context context) {
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final String deviceId;
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try {
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TelephonyManager tm =
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(TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
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if (tm == null) {
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return null;
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}
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deviceId = tm.getDeviceId();
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if (deviceId == null) {
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return null;
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}
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} catch (Exception e) {
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Log.d(Logging.LOG_TAG, "Error in TelephonyManager.getDeviceId(): " + e.getMessage());
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return null;
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}
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return Utility.getSmallHash(deviceId);
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}
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}
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