Android判断是否安装某个应用程序

RT，贴代码：
 1 public boolean isPackageExist(pkgName){ 
 2         boolean isExist = false;
 3         final PackageManager packageManager = this.getPackageManager();
 4         List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);
 5         List<String> pName = new ArrayList<String>();
 6         if (pinfo != null) {
 7             for (int i = 0; i < pinfo.size(); i++) {
 8                 String pn = pinfo.get(i).packageName;
 9                 pName.add(pn);
10             }
11         }
12         if (pName.contains(pkgName)) {
13             isExist = true;
14         } else {
15             isExist = false;
16         }
17          return isExist;
18     }