在此行发现多个注释：-文档中根元素之后的标记必须格式正确

Question

I'm new to coding and want to learn really bad.
I am on the developer.android.com site to teach myself.
Unfortunately, I have run into a quagmire and can't get past this code.
Please, help. What am I doing wrong?
If you want to look at the exercise here is the address:
http://developer.android.com/training/basics/firstapp/building-ui.html#Button

<?xml version="1.0" encoding ="utf-8" ?>
<LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" />

    <EditText android:id="@+id/edit_message"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:hint="@string/edit_message" />
     <Button
        android:layout_width="wrap_content"
            android:layout_height="wrap_content"
    android:text="@string/button_send" />

</LinearLayout>

Answer 1

Your issue is here:

<LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" />

Note that you have

/> 

This closes the linear layout tag. It should look like this:

<LinearLayout xmlns:android ="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal" >

without the closing /

Note:

If you are on linux, a REALLY easy way to determine if you've copied code from tutorials correctly is using Meld. I copied your code into a file name 1, the tutorial code in a file named 2 and did "meld 1 2", the resultant UI displayed exactly what your error was without my even having to think

Edit:

First - meld for windows;

http://meldmerge.org/

For your issue with the param:

@String/edit_message

You need to define this value in the string resources of your application. The following is taken from

http://developer.android.com/guide/topics/resources/string-resource.html

FILE LOCATION:
res/values/filename.xml  // in oyur case this will likely be Strings.xml

The filename is arbitrary. The <string> element's name will be used as the resource ID.

COMPILED RESOURCE DATATYPE:
Resource pointer to a String.

RESOURCE REFERENCE:
In Java: R.string.string_name
In XML:@string/string_name

SYNTAX:
<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string
        name="string_name"  // in your case this will be name="edit_message"
        >text_string</string>
</resources>

If the file doesn't exist, you can create it in the location:

/res/values/strings.xml

Define your values and such there and everything should be fixed.