面試時遇到這樣的題目

 

問題來的太突然，完全沒有準備，結果我想到了android 6.0之後推出的 normal permissions 和 dangerous permissions

並且把這兩者之間的關係答了一下，而且還舉了個例子，現在想想，真是丟人

關於普通許可權和危險許可權，我把android 官網這個粘過來，給大家看看

If your app lists normal permissions in its manifest (that is, permissions that don't pose much risk to the user's privacy or the device's operation), the system automatically grants those permissions. If your app lists dangerous

 permissions in its manifest (that is, permissions that could potentially affect the user's privacy or the device's normal operation), the system asks the user to explicitly grant those permissions. The way Android makes the requests depends on the system version, and the system version targeted by your app:

• If the device is running Android 6.0 (API level 23) or higher, and the app's targetSdkVersion is 23 or higher, the app requests permissions from the user at run-time. The user can revoke the permissions at any time, so the app needs to check whether it has the permissions every time it runs. For more information about requesting permissions in your app, see the 
  Working with System Permissions training guide.
• If the device is running Android 5.1 (API level 22) or lower, or the app's targetSdkVersion is 22 or lower, the system asks the user to grant the permissions when the user installs the app. If you add a new permission to an updated version of the app, the system asks the user to grant that permission when the user updates the app. Once the user installs the app, the only way they can revoke the permission is by uninstalling the app.

Normal and Dangerous Permissions

System permissions are divided into several protection levels. The two most important protection levels to know about are normal and dangerouspermissions:

• Normal permissions cover areas where your app needs to access data or resources outside the app's sandbox, but where there's very little risk to the user's privacy or the operation of other apps. For example, permission to set the time zone is a normal permission. If an app declares that it needs a normal permission, the system automatically grants the permission to the app. For a full listing of the current normal permissions, see Normal permissions.
• Dangerous permissions cover areas where the app wants data or resources that involve the user's private information, or could potentially affect the user's stored data or the operation of other apps. For example, the ability to read the user's contacts is a dangerous permission. If an app declares that it needs a dangerous permission, the user has to explicitly grant the permission to the app.

那麼哪些是安全許可權呢？

下面這些都是安全許可權：