selector与layer-list 单边框效果

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<?xml version="1.0" encoding="utf-8"?><selector xmlns:android="http://schemas.android.com/apk/res/android">    <item android:state_focused="true">        <layer-list>            <item                android:bottom="0.5dp"                android:top="-1dp"                android:left="-1dp"                android:right="-1dp">                <shape>                <solid                    android:color="#00F5FF" />                <stroke                    android:width="0.5dp"                    android:color="#00F5FF" />            </shape>            </item>        </layer-list>    </item>    <item android:state_pressed="true">        <layer-list>            <item                android:bottom="0.5dp"                android:top="-1dp"                android:left="-1dp"                android:right="-1dp"><shape>                <solid                    android:color="#00F5FF" />                <stroke                    android:width="0.5dp"                    android:color="#00F5FF" />            </shape>            </item>        </layer-list>    </item>    <item>        <layer-list>            <item                android:bottom="0.5dp"                android:top="-1dp"                android:left="-1dp"                android:right="-1dp">                <shape>                  <solid                      android:color="#00F5FF" />                  <stroke                      android:width="0.5dp"                      android:color="#949494" />                </shape>            </item>        </layer-list>    </item></selector>

概要：

实现单边框主要是layer-list  item中bottom,top,left,right四种属性！

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