清除另一个应用缓存

Question

I´ve been reading around here about cleaning another applications cahce-memory, and I´ve also tried coding my own app. The result I´ve got, is that with Androids current securitylayer, it´s not possible.

But, there is currently many cache-cleaner applications out there on the Market (Google Play)?

When I started my application which I gave the android.permission.DELETE_CACHE_FILES permission, the LogCat printed

Not granting permission android.permission.DELETE_CACHE_FILES to package <MY_PACKAGE_NAME> (protectionLevel=3 flags=0x8be46)

After some research I found out that 3:rd party apps would not be granted permissions with protectionLevel=3 so, I encounter a java.lang.SecurityException whenever I try to delete another application cache (logically)

My question is therefor: "How is these applications on Google Play permitted and able to delete other applications cache?"

Sorry for my bad English, not a native speaker

Answer 1

如果设备已植根且您的应用程序具有超级用户权限，则只能执行此操作。

Answer 2

Let me tell you how these apps achieve this.

Some android classes have methods which are private(@hidden) to user by default. We cannot access them directly . but you have a better approach to use Reflection .

Add permission.

<uses-permission android:name="android.permission.CLEAR_APP_CACHE"/>

And follow these answers

https://stackoverflow.com/a/17334600/3496570

https://stackoverflow.com/a/14509140/3496570

And don't forget to create a package name android.content.pm and add IPackageDataObserver.aidl to package . Then you are good to go.