android 通过PackageInfo获取ActivityInfo

// 获取PackageManagerPackageManager pm = getPackageManager();// 获取PackageInfo。PackageManager.GET_UNINSTALLED_PACKAGES与PackageManager.GET_ACTIVITIES好像不能同时使用，会报错。 List<PackageInfo> pkgs=pm.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);// 下面代码获取不到对应的ActivityInfo,actInfo总是null,//ActivityInfo[] actInfo = pkgs.get(0).activities;//这样就能获取ActivityInfo了，之后可以获得Activity的nameActivityInfo[] actInfo = getPackageManager().getPackageInfo(pkgs.get(0).packageName, PackageManager.GET_ACTIVITIES).activities;// 获取PackageManagerPackageManager pm = getPackageManager();// 获取PackageInfo。PackageManager.GET_UNINSTALLED_PACKAGES与PackageManager.GET_ACTIVITIES好像不能同时使用，会报错。 List<PackageInfo> pkgs=pm.getInstalledPackages(PackageManager.GET_UNINSTALLED_PACKAGES);// 下面代码获取不到对应的ActivityInfo,actInfo总是null,//ActivityInfo[] actInfo = pkgs.get(0).activities;//这样就能获取ActivityInfo了，之后可以获得Activity的nameActivityInfo[] actInfo = getPackageManager().getPackageInfo(pkgs.get(0).packageName, PackageManager.GET_ACTIVITIES).activities;