@RequiresApi(O) private boolean isSourceQualified(final @Nullable ApplicationInfo info) {
		return info != null && (info.targetSdkVersion < O || declaresRequestInstallPermission(info.packageName));
	}
@param base_pkg the base package name for split APK installation, or null for full installation.
installer/src/main/java/com/oasisfeng/island/installer/AppInstallerActivity.java