Why your adb shell cmd execute so fast?

[SSSANTON]

While I execute an adb comand like("adb shell input tap 100 100") in Command prompt window, it almost have 1 second delay in my phone.

So could you tell me the key to improve the execution speed? Thanks.

[rom1v]

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.

[SSSANTON]

@rom1v
Thanks! I will learn more details from your achievement.

[MemoryAndDream]

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.

So how can I use ADB command to reuse the java process for the whole session ? I am using python to execute adb command and I search for a long time to solve the delay problem with ADB.

[npes87184]

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.

So how can I use ADB command to reuse the java process for the whole session ? I am using python to execute adb command and I search for a long time to solve the delay problem with ADB.

You can use adb forward or adb reverse to create a tunnel between PC and Android. After it, create a process in Android which always live, listen to this tunnel and handle the request from PC.

[deniznehlyadyuk]

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.

So how can I use ADB command to reuse the java process for the whole session ? I am using python to execute adb command and I search for a long time to solve the delay problem with ADB.

You can use adb forward or adb reverse to create a tunnel between PC and Android. After it, create a process in Android which always live, listen to this tunnel and handle the request from PC.

Can you please share code? Or some referances?