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      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 com.android.messaging.util;
     18 
     19 import android.content.Context;
     20 import android.content.pm.PackageInfo;
     21 import android.content.pm.PackageManager.NameNotFoundException;
     22 
     23 import java.util.Locale;
     24 
     25 public final class VersionUtil {
     26     private static final Object sLock = new Object();
     27     private static VersionUtil sInstance;
     28     private final String mSimpleVersionName;
     29     private final int mVersionCode;
     30 
     31     public static VersionUtil getInstance(final Context context) {
     32         synchronized (sLock) {
     33             if (sInstance == null) {
     34                 sInstance = new VersionUtil(context);
     35             }
     36         }
     37         return sInstance;
     38     }
     39 
     40     private VersionUtil(final Context context) {
     41         int versionCode;
     42         try {
     43             PackageInfo pi = context.getPackageManager().getPackageInfo(
     44                     context.getPackageName(), 0);
     45             versionCode = pi.versionCode;
     46         } catch (final NameNotFoundException exception) {
     47             Assert.fail("couldn't get package info " + exception);
     48             versionCode = -1;
     49         }
     50         mVersionCode = versionCode;
     51         final int majorBuildNumber = versionCode / 1000;
     52         // Use US locale to format version number so that other language characters don't
     53         // show up in version string.
     54         mSimpleVersionName = String.format(Locale.US, "%d.%d.%03d",
     55                 majorBuildNumber / 10000,
     56                 (majorBuildNumber / 1000) % 10,
     57                 majorBuildNumber % 1000);
     58     }
     59 
     60     public int getVersionCode() {
     61         return mVersionCode;
     62     }
     63 
     64     public String getSimpleName() {
     65         return mSimpleVersionName;
     66     }
     67 }
     68