How to implement the button to change color in Android XML

//First example
<?XML version= "1.0" encoding= "Utf-8"?><selectorxmlns:android= "Http://schemas.android.com/apk/res/android">  <Itemandroid:state_pressed= "true"Android:color= "@color/baise"/>  <Itemandroid:state_pressed= "false"Android:color= "@color/heise"/></selector>

//A second example<?XML version= "1.0" encoding= "Utf-8"?><selectorxmlns:android= "Http://schemas.android.com/apk/res/android"><Itemandroid:state_pressed= "true">    <ShapeAndroid:shape= "Rectangle">        <SolidAndroid:color= "@color/greencolor"/>    </Shape></Item></selector>

//A third example<?XML version= "1.0" encoding= "Utf-8"?><selectorxmlns:android= "Http://schemas.android.com/apk/res/android">    <Itemandroid:state_pressed= "true">        <ShapeAndroid:shape= "Rectangle">            <SolidAndroid:color= "@color/greencolor"/>            <CornersAndroid:radius= "8DP"/>            <paddingAndroid:bottom= "0DP"Android:top= "0DP"/>        </Shape>    </Item>    <Itemandroid:state_pressed= "false">        <ShapeAndroid:shape= "Rectangle">            <SolidAndroid:color= "@color/graycolor"/>            <paddingAndroid:bottom= "0DP"Android:top= "0DP"/>            <CornersAndroid:radius= "8DP"/>        </Shape>    </Item></selector>

How to implement the button to change color in Android XML