左三角

image.png

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>
        <rotate
            android:fromDegrees="45"
            android:pivotX="85%"
            android:pivotY="135%">
            <shape android:shape="rectangle">
                <size
                    android:width="16dp"
                    android:height="16dp" />
                <solid android:color="#7d72ff" />
            </shape>
        </rotate>

    </item>
</layer-list>

右三角

image.png

<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
    <item>
        <rotate
            android:fromDegrees="45"
            android:pivotX="15%"
            android:pivotY="-35%">
            <shape android:shape="rectangle">
                <size
                    android:width="16dp"
                    android:height="16dp" />
                <solid android:color="#7d72ff" />
            </shape>
        </rotate>

    </item>
</layer-list>

正三角

image.png

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <rotate
            android:fromDegrees="45"
            android:pivotX="-40%"
            android:pivotY="80%">
            <shape android:shape="rectangle">
                <size
                    android:width="16dp"
                    android:height="16dp"/>
                <solid android:color="#7d72ff"/>
            </shape>
        </rotate>
    </item>
</layer-list>

倒三角

image.png

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
    <item>
        <rotate
            android:fromDegrees="45"
            android:pivotX="135%"
            android:pivotY="15%">
            <shape android:shape="rectangle">
                <size
                    android:width="16dp"
                    android:height="16dp"/>
                <solid android:color="#7d72ff"/>
            </shape>
        </rotate>
    </item>
</layer-list>