Question

i am creating an android application, a simple calculator, but i am getting an “[2012-03-12 20:22:21 – Calculator] Error in an XML file: aborting build.” which i couldn’t solve. could you identify the problem?

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="vertical">

<LinearLayout 
android:id="@+id/linearLayout2"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

<EditText
    android:id="@+id/txtResult"
    android:layout_width="fill_parent"
    android:layout_height="54dp"
    android:inputType="number"
    android:singleLine="true"
    android:text="@string/result"
    android:editable="false" 
    android:gravity="right">
</EditText>

</LinearLayout>
<LinearLayout 
android:id="@+id/linearLayout3"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

 <Button
     android:id="@+id/button1"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_weight="1.25"
     android:text="@string/number1" />

 <Button
     android:id="@+id/button2"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_weight="1.25"
     android:text="@string/number2" />

 <Button
     android:id="@+id/button3"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:text="@string/number3"
     android:layout_weight="1.25" />

 <Button
     android:id="@+id/buttonPlus"
     android:layout_width="wrap_content"
     android:layout_height="wrap_content"
     android:layout_weight="1.25"
     android:text="@string/calcAddition" />

</LinearLayout>
 <LinearLayout 
android:id="@+id/linearLayout4"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

     <Button
         android:id="@+id/button4"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/number4"
         android:layout_weight="1.25" />

     <Button
         android:id="@+id/button5"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/number5" 
         android:layout_weight="1.25"/>

     <Button
         android:id="@+id/button6"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/number6"
         android:layout_weight="1.25"/>

     <Button
         android:id="@+id/buttonMinus"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.25"
         android:text="@string/calcMinus" />

</LinearLayout>
 <LinearLayout 
android:id="@+id/linearLayout5"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

     <Button
         android:id="@+id/button7"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/number7"
         android:layout_weight="1.25" />

     <Button
         android:id="@+id/button8"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/number8" 
         android:layout_weight="1.25"/>

     <Button
         android:id="@+id/button9"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/number9" 
         android:layout_weight="1.25"/>

     <Button
         android:id="@+id/buttonMultiplication"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.25"
         android:text="@string/calcMultiplication" />

</LinearLayout>
<LinearLayout 
android:id="@+id/linearLayout6"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal" >

     <Button
         android:id="@+id/button0"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.02"
         android:text="@string/number0" />

     <Button
         android:id="@+id/buttonCLR"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="0.67"
         android:text="@string/calcCLR" />

     <Button
         android:id="@+id/btnCalcEqual"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="@string/calcEqual" />

     <Button
         android:id="@+id/buttonDivision"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:layout_weight="1.1"
         android:text="@string/calcDiv" />

</LinearLayout>


</LinearLayout>

strings.xml:

<?xml version="1.0" encoding="utf-8"?>

<string name="app_name">Calculator</string>
<string name="number1">1</string>
<string name="number2">2</string>
<string name="number3">3</string>
<string name="number4">4</string>
<string name="number5">5</string>
<string name="number6">6</string>
<string name="number7">7</string>
<string name="number8">8</string>
<string name="number9">9</string>
<string name="number0">0</string>
<string name="calcCLR">CLR</string>
<string name="calcDiv">/</string>
<string name="calcMultiplication">*</string>
<string name="calcAddition">+</string>
<string name="calcMinus">-</string>
<string name="result">0</string>
<string name="calcEqual">Calculate</string>

</resources>

Answer 1

If that is the entire xml layout then you must add on the first line this(before anything):

<?xml version="1.0" encoding="utf-8"?>

Also this:

xmlns:android="http://schemas.android.com/apk/res/android"

is only required only on the first element in the layout(in your case the LinearLayout with the id linearLayout1).

Edit:

On your EditText you set the color: android:textColor="@layout/main",this is wrong. If you want a color resource then do this:

android:textColor="@color/the_color"

where the_color is a color set in your colors.xml file in the values folder containing:

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <color name="the_color">#0077cc</color>

</resources>