Android中如何获取应用版本号

 public String getVersion() {
    try {
        PackageManager manager = this.getPackageManager();
        PackageInfo info = manager.getPackageInfo(this.getPackageName(), 0);
        return "当前版本号：" + info.versionName;
    } catch (Exception e) {
        e.printStackTrace();
        return "无法获取";
    }
}