在android中找不到getPackageManager()方法
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Can't find getPackageManager() method in android
提问by user3418401
I have problem with my project.
我的项目有问题。
I can't find getPackageManager()method although i imported android.content.pm.PackageManager;
getPackageManager()虽然我导入了，但我找不到方法 android.content.pm.PackageManager;
what wrong with this piece of code
这段代码有什么问题
List<PackageInfo> packs = getPackageManager().getInstalledPackages(0);
.Thanks for your helping
.谢谢你的帮助
回答by NameSpace
The error is not in your line of code, but where you are calling it. getPackageManager()is a method of Context. You can use this method inside an Activity (because an Activity is a Context), but if you are calling it elsewhere, you need to pass a Context. In a fragment you may also have access to the getActivity() function, which returns the Acitivity-Context.
错误不在您的代码行中，而在您调用它的地方。 getPackageManager()是 Context 的一种方法。您可以在 Activity 内部使用此方法（因为 Activity 是一个 Context），但是如果您在其他地方调用它，则需要传递一个 Context。在片段中，您还可以访问 getActivity() 函数，该函数返回 Acitivity-Context。
Context context...;
context.getPackageManager();
getActivity().getPackageManager();
回答by SHASHANK PUJARI
If you are using it in Activity you will not get an error or warning for getPacketManager, but if you are using it in Fragments you should prefix it with getActivity.
如果您在活动使用它，你不会得到一个错误或警告getPacketManager，但如果你是在片段使用它，你应该使用前缀getActivity。
example:
例子：
PackageManager pm = getActivity().getPackageManager();
PackageManager pm = getActivity().getPackageManager();
回答by Hariharan
Try this..
尝试这个..
I guess you are extendsis Fragment
我猜你是延伸的 Fragment
So, you have to use getActivity().getPackageManager()like below
所以，你必须getActivity().getPackageManager()像下面这样使用
List<PackageInfo> packs = getActivity().getPackageManager().getInstalledPackages(0);
Or extendsis BroadcastReceiver
或扩展是BroadcastReceiver
In side onReceiveyou have to use context.getPackageManager()like below
在侧面onReceive你必须context.getPackageManager()像下面这样使用
List<PackageInfo> packs = context.getPackageManager().getInstalledPackages(0);
回答by Ronak Mehta
I think this may be due to Context
我认为这可能是由于 Context
If you are using
如果您正在使用
Activity :Then you can directly access this method by importing android.content.pm.PackageManager;
Activity :然后就可以通过导入直接访问这个方法了android.content.pm.PackageManager;
If you are using Fragment :Then you need to provide getActivity()to avail method
如果您使用的是Fragment ：那么您需要提供getActivity()可用方法
I.E.
IE
List<PackageInfo> packs = getActivity().getPackageManager().getInstalledPackages(0);
回答by ARK
you can also try context.getPackageManager() if you have context passed as a parameter in your class constructor eg for Broadcast receiver
如果您在类构造函数中将上下文作为参数传递，例如用于广播接收器，您也可以尝试 context.getPackageManager()
回答by Ashwin S Ashok
yep.
if you extends fragment use getActivity().getPackageManager().getInstalledPackages(0);else context.getPackageManager().getInstalledPackages(0);
是的。如果您扩展片段使用getActivity().getPackageManager().getInstalledPackages(0);其他context.getPackageManager().getInstalledPackages(0);
