layer-list可以繪製出各種分割線、圖片層疊等效果。本文只針對繪製分割線，layer-list對於不會用或不太熟悉的童鞋來說不但達不到理想的效果反而造成嚴重的過度繪製。今天給大家分享一下layer-list繪製分割線（預設具有點選狀態不需要可以刪除），國際慣例上圖（如有不足之處，請指正）。

1、繪製各種分割線及過度繪製檢測

2、底部分割線，一般分割線的高度都是1個畫素，當然了得看自己的需求

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="false">
        <layer-list>
            <item android:gravity="bottom">
                <shape android:shape="rectangle">
                    <size android:height="1px" />
                    <solid android:color="#696969" />
                </shape>
            </item>
            <item android:bottom="1px">
                <shape android:shape="rectangle">
                    <solid android:color="#ffffff" />
                    <size android:width="50dp" android:height="50dp" />
                </shape>
            </item>
        </layer-list>
    </item>

    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <solid android:color="#F1F1F1" />
            <size android:width="50dp" android:height="50dp" />
        </shape>
    </item>
</selector>
 

3、頂部鋪滿底部縮排48dp的分割線，注：至於縮排尺寸根據個人或專案而定

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="false">
        <layer-list>
            <item android:gravity="bottom|left">
                <shape android:shape="rectangle">
                    <size android:width="48dp" android:height="1px" />
                    <solid android:color="#ffffff" />
                </shape>
            </item>
            <item android:gravity="top">
                <shape android:shape="rectangle">
                    <size android:height="1px" />
                    <solid android:color="#696969" />
                </shape>
            </item>
            <item android:gravity="bottom|right" android:left="48dp">
                <shape android:shape="rectangle">
                    <size android:height="1px" />
                    <solid android:color="#696969" />
                </shape>
            </item>
            <item android:bottom="1px" android:top="1px">
                <shape android:shape="rectangle">
                    <solid android:color="#ffffff" />
                    <size android:width="50dp" android:height="50dp" />
                </shape>
            </item>
        </layer-list>
    </item>

    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <solid android:color="#F1F1F1" />
            <size android:width="50dp" android:height="50dp" />
        </shape>
    </item>
</selector>
 

4、底部縮排48dp的分割線，注：至於縮排尺寸根據個人或專案而定

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="false">
        <layer-list>
            <item android:gravity="bottom|left">
                <shape android:shape="rectangle">
                    <size android:width="48dp" android:height="1px" />
                    <solid android:color="#ffffff" />
                </shape>
            </item>
            <item android:gravity="bottom|right" android:left="48dp">
                <shape android:shape="rectangle">
                    <size android:height="1px" />
                    <solid android:color="#696969" />
                </shape>
            </item>
            <item android:bottom="1px">
                <shape android:shape="rectangle">
                    <solid android:color="#ffffff" />
                    <size android:width="50dp" android:height="50dp" />
                </shape>
            </item>
        </layer-list>
    </item>

    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <solid android:color="#F1F1F1" />
            <size android:width="50dp" android:height="50dp" />
        </shape>
    </item>
</selector>
 

5、底部鋪滿頂部縮排48dp的分割線，注：至於縮排尺寸根據個人或專案而定

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

            <item android:gravity="top|left">
                <shape android:shape="rectangle">
                    <size android:width="48dp" android:height="1px" />
                    <solid android:color="#ffffff" />
                </shape>
            </item>

            <item android:gravity="top|right" android:left="48dp">
                <shape android:shape="rectangle">
                    <size android:height="1px" />
                    <solid android:color="#696969" />
                </shape>
            </item>

            <item android:gravity="bottom">
                <shape android:shape="rectangle">
                    <size android:height="1px" />
                    <solid android:color="#696969" />
                </shape>
            </item>

            <item android:bottom="1px" android:top="1px">
                <shape android:shape="rectangle">
                    <solid android:color="#ffffff" />
                    <size android:width="50dp" android:height="50dp" />
                </shape>
            </item>
        </layer-list>
    </item>

    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <solid android:color="#F1F1F1" />
            <size android:width="50dp" android:height="50dp" />
        </shape>
    </item>
</selector>

6、底部頂部都鋪滿的分割線

<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="false">
        <layer-list>
            <item android:gravity="top">
                <shape android:shape="rectangle">
                    <size android:height="1px" />
                    <solid android:color="#696969" />
                </shape>
            </item>

            <item android:gravity="bottom">
                <shape android:shape="rectangle">
                    <size android:height="1px" />
                    <solid android:color="#696969" />
                </shape>
            </item>

            <item android:bottom="1px" android:top="1px">
                <shape android:shape="rectangle">
                    <solid android:color="#ffffff" />
                    <size android:width="50dp" android:height="50dp" />
                </shape>
            </item>
        </layer-list>
    </item>

    <item android:state_pressed="true">
        <shape android:shape="rectangle">
            <solid android:color="#F1F1F1" />
            <size android:width="50dp" android:height="50dp" />
        </shape>
    </item>
</selector>