shape实现渐变背景 selector

1，shape渐变色

<shape xmlns:android="http://schemas.android.com/apk/res/android" >
            <!--
            android:startColor="#aa000000"  渐变起始色值
            android:centerColor=""      渐变中间色值
            android:endColor="#ffffffff"    渐变结束颜色
            android:angle="45"      渐变的方向 默认为0 从做向右 ，90时从下向上 必须为45的整数倍
            android:type="radial"       渐变类型 有三种 线性linear 放射渐变radial 扫描线性渐变sweep
            android:centerX="0.5"       渐变中心相对X坐标只有渐变类型为放射渐变时有效
            android:centerY="0.5"       渐变中心相对Y坐标只有渐变类型为放射渐变时有效
            android:gradientRadius="100"    渐变半径 非线性放射有效
             -->
            <gradient
                android:startColor="#b7bbd9"
                android:endColor="#5CACEE"
                android:angle="90"
                />
        </shape>
           

2， selector 电视选中框

<selector xmlns:android="http://schemas.android.com/apk/res/android">
        <item android:state_focused="true">
            <shape android:shape="rectangle">
                <solid android:color="@color/focus_selected" />
                <stroke android:width="@dimen/dp_1080p_4px" android:color="@color/focus_selected" />
                <corners android:radius="@dimen/dp_1080p_18px" />
            </shape>
        </item>
    
    
        <item android:state_focused="false">
            <shape android:shape="rectangle">
                <solid android:color="@color/black" />
                <stroke android:width="@dimen/dp_1080p_4px" android:color="@color/white" />
                <corners android:radius="@dimen/dp_1080p_18px" />
            </shape>
        </item>
    
    </selector>