Bughunting camtimer : can not enlarge the image

Expected behavior

Can zoom in and out the image size

Actual behavior

When we swipe to enlarge the image there is no response whatsoever

How to reproduce

• Download cam timer app in f-droid Here

• Install and launch app

• press button library

• select your photo

• swipe your phone screen to enlarge the image

• while in other applications can to zoom in and out the image

• Device used: Xiaomi redmi 3 RAM 2.00 GB

• Operating System: Android version 5.1.1 LMY47V
• Application version: 1.2.3
• Github Here

Recording Of The Bug