Complete solid-state cholesteric liquid crystal (CLCsolid) droplets and shells are fabricated using microfluidics. The CLCsolid droplets and shells exhibit unique coloured reflection spot at the centre, cross-communication dots, and central concentric rings. The helical pitch depends on the solvent quality, temperature, and humidity, giving rise to a reversible reflection colour change of the CLCsolid droplet and shell under external stimuli. The CLCsolid droplets and shells are extremely stable for a long time, even in a good solvent. This smart solid-state molecular-spring photonic droplet eliminates the obstacles to CLC-droplet application caused by the fluidic LC state, and thus introduces a new avenue for CLC applications. The photonic interpentrating polymer network structure with smart hydrogels was introduced for biosensor applications for detecting the important analytes through reflection color change without sophisticate intruments and battries