Several apk was used to extract the signature, a signature on a display value, a display of the signature, the signature value only a string, want to know what is the difference between, on behalf of what?
Qq test application:


Apk extract and obtain a signature as shown in figure
Signature: 98 e422d8c878e171fae790059bc4049d

A tool according to figure 2
SHA1withRSA v3
MD5:98: E4:22: D8: C8:78: E1:71: FA: E7:90:05:9 B: C4:04:9
D
SHA1:5 e: 2 c: c: 6, 99:7 f: 72:6 a: 67:20: AB: 55:50:8 b: 98:42: C4:12: B3: C1: D0

SHA256: DC: E3: F4:84-9 c: long: F1:2 a: FF: 59:1 F: B0:70: a: 0 1 c: EE: 72:5 b: 4 F: 6 c: all F: 5 c: AE: 83-68:5 c: A0:2 c: 1 c: C6


X-ray plore figure 3

The appended drawings below