Cannot input text or Press Keys or Press Keycode - robotframework

Question

I am very new to robot framework, working it at pycharm.
I just want to input some text at current field. but none of these works.
I have tried
Press Keycode a
Press Keys text_field q
input text ${mylocator} ${string-abc}
If I am using the correct library?
*** Settings ***
Library AppiumLibrary run_on_failure=AppiumLibrary.CapturePageScreenshot
Library Selenium2Library run_on_failure=AppiumLibrary.CapturePageScreenshot
*** Variables ***
${MsgEditor} //*[#class='android.widget.RelativeLayout' and #resource-id='com.test.abc.work.cac:id/editor']
*** Test Cases ***
Add item
Press Keys text_field q <--error browser not open
\\or
appiumlibrary.Input Text ${MsgEditor} update <== error Message: Cannot set the element to 'update'. Did you interact with the correct element?
updated that Press Keys still failed. error:
KEYWORD Selenium2Library . Press Keys text_field, q
Documentation:
Simulates the user pressing key(s) to an element or on the active browser.
Start / End / Elapsed: 20201218 10:05:20.575 / 20201218 10:05:21.339 / 00:00:00.764
00:00:00.755KEYWORD AppiumLibrary . Capture Page Screenshot
10:05:20.575 TRACE Arguments: [ 'text_field' | 'q' ]
10:05:20.581 INFO Sending key(s) ('q',) to text_field element.
10:05:21.339 FAIL No browser is open.
10:05:21.339 DEBUG Traceback (most recent call last):
File "c:\users\tester\pycharmprojects\androidtest\venv\lib\site-packages\SeleniumLibrary\__init__.py", line 471, in run_keyword
return DynamicCore.run_keyword(self, name, args, kwargs)
File "c:\users\tester\pycharmprojects\androidtest\venv\lib\site-packages\robotlibcore.py", line 103, in run_keyword
return self.keywords[name](*args, **(kwargs or {}))
File "c:\users\tester\pycharmprojects\androidtest\venv\lib\site-packages\SeleniumLibrary\keywords\element.py", line 895, in press_keys
element = self.find_element(locator)
File "c:\users\tester\pycharmprojects\androidtest\venv\lib\site-packages\SeleniumLibrary\base\context.py", line 74, in find_element
return self.element_finder.find(locator, tag, True, required, parent)
File "c:\users\tester\pycharmprojects\androidtest\venv\lib\site-packages\SeleniumLibrary\locators\elementfinder.py", line 74, in find
parent=parent or self.driver)
File "c:\users\tester\pycharmprojects\androidtest\venv\lib\site-packages\SeleniumLibrary\base\context.py", line 32, in driver
return self.ctx.driver
File "c:\users\tester\pycharmprojects\androidtest\venv\lib\site-packages\SeleniumLibrary\__init__.py", line 547, in driver
raise NoOpenBrowser('No browser is open.')
InputText failed. I have this same InputText at other field and works. I tried tap over different field with that locator and it works.
is the app has issue on that element? but i can press on keyboard manually after tap to the field.

Answer 1

I recommend reading the official documentation first: http://serhatbolsu.github.io/robotframework-appiumlibrary/AppiumLibrary.html and the user guide as well: https://robotframework.org/robotframework/latest/RobotFrameworkUserGuide.html
Press Keys is not a keyword from AppiumLibrary. It's a keyword from SeleniumLibrary (https://robotframework.org/SeleniumLibrary/SeleniumLibrary.html#Press%20Keys), but you're not importing it to your project. And even if you imported it, this keyword takes two arguments (locator and keys), so you need to use it correctly.
*** Test Cases ***
Press Keys a
In addition to what I've said, there's no test case name, this is incorrect and won't work, it will in fact give you the following error:
Test case name cannot be empty.
You have correctly used Input Test keyword from AppiumLibrary. However, you might need to validate that your locator is correct. We can't say that since you didn't include that information in your question.

Answer 2

I have used another method. Adb shell input text to fire the text