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/*
/*
* Copyright (C) 2011 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.
*/
package com.android.emailcommon;
import com.android.emailcommon.utility.Utility;
import android.content.Context;
import android.telephony.TelephonyManager;
import android.util.Log;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
public class Device {
private static String sDeviceId = null;
/**
* EAS requires a unique device id, so that sync is possible from a variety of different
* devices (e.g. the syncKey is specific to a device) If we're on an emulator or some other
* device that doesn't provide one, we can create it as android<n> where <n> is system time.
* This would work on a real device as well, but it would be better to use the "real" id if
* it's available
*/
static public synchronized String getDeviceId(Context context) throws IOException {
if (sDeviceId == null) {
sDeviceId = getDeviceIdInternal(context);
}
return sDeviceId;
}
static private String getDeviceIdInternal(Context context) throws IOException {
if (context == null) {
throw new IllegalStateException("getDeviceId requires a Context");
}
File f = context.getFileStreamPath("deviceName");
BufferedReader rdr = null;
String id;
if (f.exists()) {
if (f.canRead()) {
rdr = new BufferedReader(new FileReader(f), 128);
id = rdr.readLine();
rdr.close();
// STOPSHIP Remove logging
Log.w(Logging.LOG_TAG, "deviceId read as: " + id);
return id;
} else {
Log.w(Logging.LOG_TAG, f.getAbsolutePath() + ": File exists, but can't read?" +
" Trying to remove.");
if (!f.delete()) {
Log.w(Logging.LOG_TAG, "Remove failed. Tring to overwrite.");
}
}
}
BufferedWriter w = new BufferedWriter(new FileWriter(f), 128);
final String consistentDeviceId = getConsistentDeviceId(context);
if (consistentDeviceId != null) {
// Use different prefix from random IDs.
id = "androidc" + consistentDeviceId;
} else {
id = "android" + System.currentTimeMillis();
}
w.write(id);
w.close();
// STOPSHIP Remove logging
Log.w(Logging.LOG_TAG, "deviceId written as: " + id);
return id;
}
/**
* @return Device's unique ID if available. null if the device has no unique ID.
*/
public static String getConsistentDeviceId(Context context) {
final String deviceId;
try {
TelephonyManager tm =
(TelephonyManager) context.getSystemService(Context.TELEPHONY_SERVICE);
if (tm == null) {
return null;
}
deviceId = tm.getDeviceId();
if (deviceId == null) {
return null;
}
} catch (Exception e) {
Log.d(Logging.LOG_TAG, "Error in TelephonyManager.getDeviceId(): " + e.getMessage());
return null;
}
return Utility.getSmallHash(deviceId);
}
}
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