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Android resource linking failed, Hardcoded text

I don't know the reason why it keep goes on with error. Please help me!
enter image description here

after viewing your code, I found an error is app:showAction.
the correct attribute is android:showAsAction="ifRoom", not app:showAction="ifRoom"
please remove app:showAction="ifRoom" & add android:showAsAction="ifRoom".

unexpected token - android studio

I have a problem with my layout text code. Instead of displaying the code I wrote, it shows a bunch of weird symbols like :
"IHDR 0 0 �1
I thought this issue had to do with the file encoding, but I changed the global encoding to UTF-8 and still doesn´t show the code I wrote.
All suggestions are welcome. Thanks in advance.

Late answer but it will help others:
You need to delete catches folder located in:
C:\Users\user\.AndroidStudio3.5\system\caches
Make sure android studio is closed before you delete, then after deletion you can launch it and it creates a new catch folder that solves your problem,

Android "Valid XML document must have a root tag at line"

Before asking this question, I searched goole and so as well but I could not found any help.
The code looks well but I am unable to understand the error
Valid XML document must have a root tag at line 15.
Please have a look to the attached image.
any help will be much appreciated.
Additional:
I have analyzed code many times. But still getting the following:
Thanks in advance.
Iqbal

Remove the </android.support....> line and just close the tag so: />

I am getting error in R.java .Do not know how to proceed?

I am getting error with the generated java file. But the code is fine and good . Can any one give suggestion.
thanks in advance.

Based on your image it appears that you are getting an error with the element with id of "enter", try changing the id of that element to something more descriptive and the error might go away.

You don't say which error you are getting. Usually you can resolve errors in R.java by removing it, and letting Eclipse regenerate it. If you still are getting the same error, you can try to rename the controls with the offending id.
If you wish further assistance, you need to say which error you are getting.

Android DDMS exceptions?

As i'm new to android, i really couldn't understand the errors or execptions shown in the android DDMS,I'm using Eclipse ..
Can anyone please share some very frequent exceptions that appear in DDMS and how to handle them......

We should explain exceptions here for you? Maybe you should try to read the name of the exception... most of them are named understandable. And the very first thing you should do to learn about exceptions is to read their documentation: the very famous one for example: http://developer.android.com/reference/java/lang/NullPointerException.html
If that didnt help, try to search with google or here on StackOverflow...

If you opened any xml files, this error shoud occur. Close all xml files of your application.

I'm not certain but I'm also having the same problem. I believe it occurs when you try to call something that is out of context. For example if you tried to call
TextView myTextView= (TextView)findViewById(R.id.myTextView);
when you had set a contentView as something that did not contain 'myTextView'
Hope this helps!

I think this type of error occurred when you have edited the .xml file and rebuild the project.
If you have opened any xml files, save all the .xml files and Close all xml files of your application.
and run the project. this way i run my application when this type of error occurred.