CouponView

allprojects {
    repositories {
        ...
        maven { url "https://jitpack.io" }
    }
}

dependencies {
	    compile 'com.github.dongjunkun:CouponView:1.0.4'
	}

<yyydjk.com.library.CouponView
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/couponView"
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:background="@color/colorAccent"
    android:orientation="vertical"
    android:padding="10dp"
    app:cv_dash_line_color="@android:color/white"
    app:cv_dash_line_gap="5dp"
    app:cv_dash_line_height="0.8dp"
    app:cv_dash_line_length="10dp"
    app:cv_dash_line_margin_bottom="5dp"
    app:cv_dash_line_margin_left="5dp"
    app:cv_dash_line_margin_right="5dp"
    app:cv_dash_line_margin_top="8dp"
    app:cv_is_dash_line_bottom="true"
    app:cv_is_dash_line_left="true"
    app:cv_is_dash_line_right="true"
    app:cv_is_dash_line_top="false"
    app:cv_is_semicircle_bottom="false"
    app:cv_is_semicircle_left="false"
    app:cv_is_semicircle_right="false"
    app:cv_is_semicircle_top="true"
    app:cv_semicircle_color="@android:color/white"
    app:cv_semicircle_gap="4dp"
    app:cv_semicircle_radius="4dp">
</yyydjk.com.library.CouponView>

public class CustomView extends YourView{

    private CouponViewHelper helper;

    public CustomView(Context context) {
        this(context, null);
    }

    public CustomView(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public CustomView(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
        helper = new CouponViewHelper(this, context, attrs, defStyle);
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
        helper.onSizeChanged(w, h);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        helper.onDraw(canvas);
    }

    public float getSemicircleGap() {
        return helper.getSemicircleGap();
    }

    public void setSemicircleGap(float semicircleGap) {
        helper.setSemicircleGap(semicircleGap);
    }

    public float getSemicircleRadius() {
        return helper.getSemicircleRadius();
    }

    public void setSemicircleRadius(float semicircleRadius) {
        helper.setSemicircleRadius(semicircleRadius);
    }

   ......
}

 <yyydjk.com.couponview.widget.CouponImageView
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:id="@+id/couponView"
        android:layout_width="match_parent"
        android:layout_height="150dp"
        android:orientation="vertical"
        android:src="@mipmap/image"
        android:scaleType="centerCrop"
        app:cv_dash_line_color="@android:color/white"
        app:cv_dash_line_gap="5dp"
        app:cv_dash_line_height="2dp"
        app:cv_dash_line_length="10dp"
        app:cv_is_dash_line_bottom="false"
        app:cv_is_semicircle_bottom="true"
        app:cv_is_dash_line_left="true"
        app:cv_is_semicircle_left="false"
        app:cv_is_dash_line_right="true"
        app:cv_is_semicircle_right="false"
        app:cv_is_dash_line_top="false"
        app:cv_is_semicircle_top="true"
        app:cv_semicircle_color="@android:color/white"
        app:cv_semicircle_gap="8dp"
        app:cv_semicircle_radius="6dp"/>