为什么scrcpy的模拟点击和模拟触摸速度那么快，因为没有使用adb

https://github.com/Genymobile/scrcpy/issues/231

Why your adb shell cmd execute so fast?

Because I don't use adb shell commands for input events 😉

When you execute adb shell input ...:

1. it executes a new process locally
2. it connects to the local adb daemon
3. the request is forwarded to the adb server on the device
4. a shell is started
5. the input command script is executed
6. this starts a new java process to execute the public static void main() method of Input.java
7. the arguments are parsed
8. the events are injected by a simple method call (e.g. injectKeyEvent())

All of this is executed for every adb shell input ... command. The main delay is step 6 (starting the Java process).

In scrcpy, only 1 Java process is started (the server) for the whole session. This process opens a socket to communicate with the client.

The client sends every input event over this socket (using a custom protocol). The server receives and handle these events immediately.