Fix signing failure for split APKs

Test: th
Bug: 353837347
Change-Id: Ifed9746c1e1d053a97860de3bab4380d6e207412

tools/releasetools/common.py

@@ -2434,12 +2434,23 @@ def GetMinSdkVersion(apk_name):
         "Failed to obtain minSdkVersion for {}: aapt2 return code {}:\n{}\n{}".format(
             apk_name, proc.returncode, stdoutdata, stderrdata))
 
+  is_split_apk = False
   for line in stdoutdata.split("\n"):
+    # See b/353837347 , split APKs do not have sdk version defined,
+    # so we default to 21 as split APKs are only supported since SDK
+    # 21.
+    if (re.search(r"split=[\"'].*[\"']", line)):
+      is_split_apk = True
     # Due to ag/24161708, looking for lines such as minSdkVersion:'23',minSdkVersion:'M'
     # or sdkVersion:'23', sdkVersion:'M'.
     m = re.match(r'(?:minSdkVersion|sdkVersion):\'([^\']*)\'', line)
     if m:
       return m.group(1)
+  if is_split_apk:
+    logger.info("%s is a split APK, it does not have minimum SDK version"
+                " defined. Defaulting to 21 because split APK isn't supported"
+                " before that.", apk_name)
+    return 21
   raise ExternalError("No minSdkVersion returned by aapt2 for apk: {}".format(apk_name))