add a PanelView.PanelView into your xml
<PanelView.PanelView
android:id="@+id/panView"
panel:Unit=" Km/h"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="当前速度"/>
more attrs to see values/attr,you can choose attr you need
you can also change attr by calling method like,more details to see PanelView.java
setPercent(int percent);
setText(String text);
setTextSize(int size);
setArcColor(int color);
setPointerColor(int color);
setArcWidth(int width);
setPointerColor(int color);
setAcrStartColor(int acrStartColor);
setAcrEndColor(int acrEndColor);<br>
setUnit(String unit);<br>