Add utility function for checking package version

The change also refactors some pieces of code to use new utility
function

BUG=469115

Review URL: https://codereview.chromium.org/1040433002

Cr-Commit-Position: refs/heads/master@{#322760}

1 files changed, 37 insertions, 0 deletions

diff --git a/base/android/java/src/org/chromium/base/PackageUtils.java b/base/android/java/src/org/chromium/base/PackageUtils.java
new file mode 100644
index 0000000..ab554cd
--- /dev/null
+++ b/base/android/java/src/org/chromium/base/PackageUtils.java
@@ -0,0 +1,37 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+package org.chromium.base;
+
+import android.content.Context;
+import android.content.pm.PackageInfo;
+import android.content.pm.PackageManager;
+
+/**
+ * This class provides package checking related methods.
+ */
+public class PackageUtils {
+    /**
+     * Retrieves the version of the given package installed on the device.
+     *
+     * @param context Any context.
+     * @param packageName Name of the package to find.
+     * @return The package's version code if found, -1 otherwise.
+     */
+    public static int getPackageVersion(Context context, String packageName) {
+        int versionCode = -1;
+        PackageManager pm = context.getPackageManager();
+        try {
+            PackageInfo packageInfo = pm.getPackageInfo(packageName, 0);
+            if (packageInfo != null) versionCode = packageInfo.versionCode;
+        } catch (PackageManager.NameNotFoundException e) {
+            // Do nothing, versionCode stays -1
+        }
+        return versionCode;
+    }
+
+    private PackageUtils() {
+        // Hide constructor
+    }
+}