Resource exception not found for selector.xml

Question

I have a problem when I get this error ...

03-02 19: 59: 03.539: E / AndroidRuntime (11177): java.lang.RuntimeException: Cannot start activity ComponentInfo {com.comp4020.kitchenaid / com.kitchenaid.MainActivity}: android.content.res.Resources $ NotFoundException: File res / drawable / main_button.xml from resource resource ID # 0x7f020003

I do not know why this is happening. A resource most definitely exists, and it is correctly named without errors. The only thing I think about is that I added characters to the program that were not installed by default, so he asked "Change to UTF-8," and I said yes.

I assign this resource as follows:

ingButton.setBackgroundResource(R.drawable.main_button);
nextButton.setBackgroundResource(R.drawable.main_button);
prevButton.setBackgroundResource(R.drawable.main_button);
timerButton.setBackgroundResource(R.drawable.main_button);

I also tried a cleaning project. I have no idea what is going on.

EDIT: Here is a tapped

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
    <item 
        android:state_pressed="true"
        android:background="@drawable/gradient_pressed"
        />
     <item android:background="@drawable/gradient"/>

</selector>

gradient.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <gradient android:startColor="@color/gradientDark" 
              android:centerColor="@color/gradientDark"
              android:endColor="@color/gradientLight" 
              android:angle="90" />
</shape>

gradient_pressed.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
    <gradient android:startColor="@color/highlightGradientDark" 
              android:centerColor="@color/highlightGradientDark"
              android:endColor="@color/highlightGradientLight" 
              android:angle="90" />

</shape>

Answer 1

Newer versions of Android explain a bit more:

E/AndroidRuntime(5591): Caused by: org.xmlpull.v1.XmlPullParserException: Binary XML
file line #4: <item> tag requires a 'drawable' attribute or child tag defining a drawable

The problem is that the selector has android: color, or in your case android: background in each element instead of android: a stretched transition to the first solves the problem.