Android uses gallery and imageswitch to make a picture browser that can slide left and right

design sketch:

In order to make the picture browser slide around indefinitely, we need to customize the gallery adapter

If you want to customize the adapter, you must first understand these methods

Where getcount method is to return the number of data sources

The getitem method returns an object object, that is, the object corresponding to the data ID position in the current container

Getitemid returns the data ID in the current container

Getview gets the view to be displayed

If we want to realize the left-right circular sliding, first we need to return the number of data sources as the maximum value, then take the ID of all data to the number of original data sources, and finally set the initial position of gallery in the middle of 0-maximum value

The changed adapter is like this

MainActivity

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