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Figure 1. Document provider data model. A Root points to a single Document, which then starts the fan-out of the entire tree. As stated above, the document provider data model is based on a traditional file hierarchy. However, you can physically store your data however you like, as long as you can access it by using DocumentsProvider API. For example, you could use tag-based cloud storage for your data.

Figure 3 shows a picker in which a user searching for images has selected the Downloads folder. It also shows all of the roots available to the client app. After the user selects the Downloads folder, the images are displayed. Figure 4 shows the result of this process. The user can now interact with these images in the ways that the provider and client app support.

Figure 4. Images stored in the Downloads folder, as viewed in the system picker. On Android 4. The user must then select a single app from which to pick a file and the selected app must provide a user interface for the user to browse and pick from the available files.

From this single UI, the user can pick a file from any of the supported apps. On Android 5. The one you should use depends on the needs of your app:. For more information on how to support browsing for files and directories using the system picker UI, see the guide on how to access documents and other files.

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