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Using "permission" and "uses-permission" tags we can give and access permissions. Then why we need "permission-tree", In which way it is useful?
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Add declaration to app manifest To declare a permission that your app might request, include the appropriate <uses-permission> element in your app's manifest file. For example, an app that needs to access the camera has this line in AndroidManifest. xml : <manifest ...>
contained in: <manifest> description: Declares a security permission that can be used to limit access to specific components or features of this or other applications.
description: Specifies a system permission that the user must grant in order for the app to operate correctly. Permissions are granted by the user when the application is installed (on devices running Android 5.1 and lower) or while the app is running (on devices running Android 6.0 and higher).
permission-tree allows an application to declare a namespace of permissions, in which it can dynamically at runtime define new permissions. This is used example, by google's service APIs to have a namespace for individual permissions to each google service that it discovers at runtime.
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permission-tree is namespace and used for adding new permissions at run time. If you want to add new permissions then that should be defined earlier or used by any other application previously with same key. This feature is back-> forward means you can use for your comfort (if you don't want to give set of permission again).
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