三角形
<?xml version="1.0" encoding="utf-8"?>
<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="@dimen/px_20"
android:height="@dimen/px_20" />
<solid android:color="@color/app_line_background" />
</shape>
</rotate>
</item>
</layer-list>
气泡区
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<layer-list>
<item>
<shape>
<corners android:bottomLeftRadius="@dimen/px_8" android:bottomRightRadius="@dimen/px_8" android:topRightRadius="@dimen/px_8" />
<solid android:color="@color/app_line_background" />
</shape>
</item>
</layer-list>
</item>
</selector>
