ImageView设置点击效果没有用？ImageView src的图片大小改变不了？

    <ImageView
        android:layout_width="@dimen/x90"
        android:layout_height="@dimen/x90"
        android:padding="@dimen/x26"
        android:layout_gravity="right|center_vertical"
        android:clickable="true"
        android:longClickable="true"
        android:src="@drawable/selector_home_toolbar_iv_add_bg" />

<?xml version="1.0" encoding="utf-8"?>
<selector
    xmlns:android="http://schemas.android.com/apk/res/android">
　<!--上面这两行也可以，state_enabled设置与否都行-->
    <!--<item android:state_enabled="true" android:state_pressed="true" android:drawable="@drawable/home_toolbar_add_pressed" />-->
    <!--<item android:state_enabled="false"  android:drawable="@drawable/home_toolbar_add_normal" />-->
  
    <item  android:state_pressed="true" android:drawable="@drawable/home_toolbar_add_pressed" />

  　<item   android:drawable="@drawable/home_toolbar_add_normal" />

</selector>

    <ImageView
        android:id="@+id/iv_item_close"
        android:layout_width="@dimen/x78"
        android:layout_height="@dimen/x68"
        android:padding="@dimen/x10"
        android:layout_marginRight="@dimen/x20"
        android:src="@mipmap/close"
        android:layout_gravity="center_vertical"/>
    <!--android:scaleType="centerInside"-->