获得android应用的版本号

在开发的过程中，需要获得版本号

    private PackageInfo getVersion() {
        PackageManager packageManager = MyApplication.getInstance().getPackageManager();
        PackageInfo packageInfo = null;
        try {
            packageInfo = packageManager.getPackageInfo(MyApplication.getInstance().getPackageName(), 0);
        } catch (NameNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }
        return packageInfo;
    }

    private String getVersionName() {
        return getVersion().versionName;
    }

    private String getVersionCode() {
        return String.valueOf(getVersion().versionCode);
    }

==完