base/android/java/src/org/chromium/base/PackageUtils.java

// 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;
import android.content.pm.PackageManager.NameNotFoundException;

/**
 * This class provides package checking related methods.
 */
public class PackageUtils {
    /**
     * Retrieves the PackageInfo object for this application.
     *
     * @param context Any context.
     * @return The PackageInfo object for this application.
     */
    public static PackageInfo getOwnPackageInfo(Context context) {
        PackageManager manager = context.getPackageManager();
        try {
            String packageName = context.getApplicationContext().getPackageName();
            return manager.getPackageInfo(packageName, 0);
        } catch (NameNotFoundException e) {
            // Should never happen.
            throw new AssertionError("Failed to retrieve own package info");
        }
    }

    /**
     * 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
    }
}