android中获取package信息（版本号等）

 1     private String getVersionsName(){
 2         PackageManager packageManager = getPackageManager();
 3         try {
 4             //获取包的信息
 5             //Manager   管理
 6             PackageInfo packageInfo = packageManager.getPackageInfo(getPackageName(),0);
 7             //获取版本号
 8             String versions =  packageInfo.versionName;
 9             Log.e("test",versions);
10             return versions;
11         } catch (PackageManager.NameNotFoundException e) {
12             //为获取到包名
13             e.printStackTrace();
14         }
15 
16         return null;
17     }