Android dragimageview realizes the zoom in effect of pulling down and dragging pictures

Drag the dragimageview drop-down to enlarge the picture, as shown above:

Main classes: inherit relativelayout, add ImageView in relativelayout, and change the scaling of ImageView through touch event. Scale is calculated during scaling, so that when the finger moves to the bottom of the screen, the bottom of the picture just reaches the bottom of the screen. When the finger is released, the picture gradually rebounds.

Called activity:

XML layout file:

Download: source code

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