需要更改图标的颜色。色调不起作用

Need to change the color of an icon. tint does not work

这是我的图片视图:

  <ImageView
                android:id="@+id/action_add_iv"
                android:layout_width="20dp"
                android:layout_height="20dp"
                android:layout_centerVertical="true"
                android:layout_marginRight="12dp"
                android:tint="@color/gray32"
                android:background="@drawable/plus_selector"
                android:text="0" />

这是我的选择器:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
    <bitmap android:alpha="160" android:src="@drawable/btn_plus_green" android:tint="@color/gray32" />
</item>
<item android:drawable="@drawable/btn_plus_green" android:state_pressed="false" android:tint="@color/gray32" />
</selector>

现在,如果我按下图标,它就会变成灰色,就像我想要的那样。但如果没有按下,它会显示绿色。为什么色调不适用于 state_pressed=false?

改为:

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true">
        <bitmap android:alpha="160" android:src="@drawable/btn_plus_green" android:tint="@color/gray32" />
    </item>
    <item android:state_pressed="false">
        <bitmap android:src="@drawable/btn_plus_green" android:tint="@color/gray32" />
    </item>
</selector>