Obtains information about all applications, determines system applications or third-party applications, and monitors application installation and uninstallation.

Obtain all applications and related information

Method 1: resolveinfo

Get all applications: packagemanager = getpackagemanager (); intent mintent = new intent (intent. action_main, null); mintent. addcategory (intent. category_launcher); List <resolveinfo> listallapps = packagemanager. queryintentactivities (mintent, 0); determines whether the system is applied: resolveinfo appinfo = listallapps. get (position); string pkgname = appinfo. activityinfo. packagename; // obtain the package name // obtain packageinfo mpackageinfo Based on the package name; (exception must be handled) mpackageinfo = mcontext. getpackagemanager (). getpackageinfo (pkgname, 0); If (mpackageinfo. applicationinfo. flags & applicationinfo. flag_system) <= 0) {// third-party application} else {// System Application} obtain the related information: resolveinfo mresolveinfo; obtain the package name: mresolveinfo. activityinfo. packagename; get icon: mresolveinfo. loadicon (packagemanager); get the application name: mresolveinfo. loadlabel (packagemanager ). tostring ();

Method 2: packageinfo

Obtain all applications: packagemanager = This. getpackagemanager (); List <packageinfo> packageinfolist = packageinfolist. getinstalledpackages (0); determines whether the system is applied: List <packageinfo> apps = new arraylist <packageinfo> (); For (INT I = 0; I <packageinfolist. size (); I ++) {packageinfo Pak = (packageinfo) packageinfolist. get (I); // determine whether the application is pre-installed by the system if (Pak. applicationinfo. flags & Pak. applicationinfo. flag_system) <= 0) {// third-party apps. add (PAK);} else {// System Application} obtain information: packageinfo mpackageinfo; obtain package name: mpackageinfo. packagename get icon: mpackageinfo. getapplicationicon (applicationinfo); obtain the application name: mpackageinfo. getapplicationlabel (applicationinfo); get permission: mpackageinfo. getpackageinfo (packagename, packagemanager. get_permissions ). requestedpermissions;

Install and uninstall the listening application:

/////////// Register the broadcast, listen to the installation and uninstallation of Public void onreceive (context, intent) {If (intent. getaction (). equals ("android. intent. action. package_added ") {// obtain the package name string packagename = intent. getdatastring ();} else if (intent. getaction (). equals ("android. intent. action. package_removed ") {// obtain the package name string packagename = intent. getdatastring ();}}