判断是否为系统应用的几种方法[整理]

原文链接：http://www.lepeng.net/blogger/?p=306

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1. if(new File("/data/app/" + packageInfo.packageName + ".apk").exists())

2. packageInfo.versionName != null && packageInfo.applicationInfo.uid > 10000

3. if((packageInfo.applicationInfo.flags& ApplicationInfo.FLAG_SYSTEM) != 0)

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* 经测试，最好使用第3个方法，另外两个不大准。

补充::示例代码>>

public static boolean isSystemApplication(Context context, String packageName){    PackageManager manager = context.getPackageManager();        try {PackageInfo packageInfo = manager.getPackageInfo(packageName, PackageManager.GET_CONFIGURATIONS);// 1if(new File("/data/app/"+packageInfo.packageName+".apk").exists()){return true;}// 2if(packageInfo.versionName!=null && packageInfo.applicationInfo.uid>10000){return true;}// 3if((packageInfo.applicationInfo.flags & android.content.pm.ApplicationInfo.FLAG_SYSTEM)!=0){return true;}} catch (NameNotFoundException e) {e.printStackTrace();}return false;    }