android 改变图片 字体颜色

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">


    <item android:state_pressed="true" android:color="@android:color/black"/>
    <item android:color="@android:color/white"/>

</selector>

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">


    <item android:drawable="@drawable/button_red_pressed" android:state_pressed="true"/>
    <item android:drawable="@drawable/button_red_normal"/>


</selector>

红色 

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="oval" >


    <solid android:color="#f00" />


</shape>