Initial checkin of AOSP Messaging app.

b/23110861

Change-Id: I9aa980d7569247d6b2ca78f5dcb4502e1eaadb8a

src/com/android/messaging/util/VersionUtil.java

@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2015 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.messaging.util;
+
+import android.content.Context;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager.NameNotFoundException;
+
+import java.util.Locale;
+
+public final class VersionUtil {
+    private static final Object sLock = new Object();
+    private static VersionUtil sInstance;
+    private final String mSimpleVersionName;
+    private final int mVersionCode;
+
+    public static VersionUtil getInstance(final Context context) {
+        synchronized (sLock) {
+            if (sInstance == null) {
+                sInstance = new VersionUtil(context);
+            }
+        }
+        return sInstance;
+    }
+
+    private VersionUtil(final Context context) {
+        int versionCode;
+        try {
+            PackageInfo pi = context.getPackageManager().getPackageInfo(
+                    context.getPackageName(), 0);
+            versionCode = pi.versionCode;
+        } catch (final NameNotFoundException exception) {
+            Assert.fail("couldn't get package info " + exception);
+            versionCode = -1;
+        }
+        mVersionCode = versionCode;
+        final int majorBuildNumber = versionCode / 1000;
+        // Use US locale to format version number so that other language characters don't
+        // show up in version string.
+        mSimpleVersionName = String.format(Locale.US, "%d.%d.%03d",
+                majorBuildNumber / 10000,
+                (majorBuildNumber / 1000) % 10,
+                majorBuildNumber % 1000);
+    }
+
+    public int getVersionCode() {
+        return mVersionCode;
+    }
+
+    public String getSimpleName() {
+        return mSimpleVersionName;
+    }
+}