移动开发----安卓判断是否安装了某个APP

1.有的时候我们要调用第三方APP。就需要查看用户是否安装了APP。

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1. public boolean isAppInstalled(Context context, String packageName) {    
2.         final PackageManager packageManager = context.getPackageManager();    
3.         List<PackageInfo> pinfo = packageManager.getInstalledPackages(0);    
4.         List<String> pName = new ArrayList<String>();    
5.         if (pinfo != null) {    
6.             for (int i = 0; i < pinfo.size(); i++) {    
7.                 String pn = pinfo.get(i).packageName;    
8.                 pName.add(pn);    
9.             }    
10.         }    
11.         return pName.contains(packageName);    
12.     }  

2.启动一个APP

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1. public void startAPP(String appPackageName){    
2.         try{    
3.             Intent intent = this.getPackageManager().getLaunchIntentForPackage(appPackageName);    
4.             startActivity(intent);    
5.         }catch(Exception e){    
6.             e.printStackTrace();    
7.             Util.toast(mContext, "未安装 GPS采集仪");    
8.         }    
9.     }