android判断是否为系统应用
public boolean isSystemApp(PackageInfo pInfo) {
return ((pInfo.applicationInfo.flags & ApplicationInfo.FLAG_SYSTEM) != 0);
}

public boolean isSystemUpdateApp(PackageInfo pInfo) {
return ((pInfo.applicationInfo.flags & ApplicationInfo.FLAG_UPDATED_SYSTEM_APP) != 0);
}

public boolean isUserApp(PackageInfo pInfo) {
return (!isSystemApp(pInfo) && !isSystemUpdateApp(pInfo));
}