1 /* 2 * Copyright (C) 2015 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.appcompat.mms; 18 19 import android.content.Context; 20 import android.telephony.TelephonyManager; 21 import android.text.TextUtils; 22 import android.util.Log; 23 24 /** 25 * The default implementation of loader of UA and UAProfUrl 26 */ 27 class DefaultUserAgentInfoLoader implements UserAgentInfoLoader { 28 // Default values to be used as user agent info 29 private static final String DEFAULT_USER_AGENT = "Android MmsLib/1.0"; 30 private static final String DEFAULT_UA_PROF_URL = 31 "http://www.gstatic.com/android/sms/mms_ua_profile.xml"; 32 33 private Context mContext; 34 private boolean mLoaded; 35 36 private String mUserAgent; 37 private String mUAProfUrl; 38 DefaultUserAgentInfoLoader(final Context context)39 DefaultUserAgentInfoLoader(final Context context) { 40 mContext = context; 41 } 42 43 @Override getUserAgent()44 public String getUserAgent() { 45 load(); 46 return mUserAgent; 47 } 48 49 @Override getUAProfUrl()50 public String getUAProfUrl() { 51 load(); 52 return mUAProfUrl; 53 } 54 load()55 private void load() { 56 if (mLoaded) { 57 return; 58 } 59 boolean didLoad = false; 60 synchronized (this) { 61 if (!mLoaded) { 62 loadLocked(); 63 mLoaded = true; 64 didLoad = true; 65 } 66 } 67 if (didLoad) { 68 Log.i(MmsService.TAG, "Loaded user agent info: " 69 + "UA=" + mUserAgent + ", UAProfUrl=" + mUAProfUrl); 70 } 71 } 72 loadLocked()73 private void loadLocked() { 74 if (Utils.hasUserAgentApi()) { 75 // load the MMS User agent and UaProfUrl from TelephonyManager APIs 76 final TelephonyManager telephonyManager = (TelephonyManager) mContext.getSystemService( 77 Context.TELEPHONY_SERVICE); 78 mUserAgent = telephonyManager.getMmsUserAgent(); 79 mUAProfUrl = telephonyManager.getMmsUAProfUrl(); 80 } 81 if (TextUtils.isEmpty(mUserAgent)) { 82 mUserAgent = DEFAULT_USER_AGENT; 83 } 84 if (TextUtils.isEmpty(mUAProfUrl)) { 85 mUAProfUrl = DEFAULT_UA_PROF_URL; 86 } 87 } 88 } 89