(1. Are Android DVM processes and Linux processes and application processes the same concept
DVM refers to the virtual machine of dalivk. Each Android application runs in its own process with a separate Dalvik virtual machine instance. Each DVM is a process in Linux, so it can be considered as the same concept.
2. What is the function of EF file of SIM card?
The file system of SIM card has its own specification, which mainly communicates with mobile phones. Sim itself can have its own operating system, and EF is used to store and communicate with mobile phones.)