[Android] Custom drawable for displaying solid color with border

BackgroundDrawable.java

import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ColorFilter;
import android.graphics.Paint;
import android.graphics.PixelFormat;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.support.annotation.ColorInt;
import android.support.annotation.IntRange;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;

import java.util.ArrayList;
import java.util.List;

public class BackgroundDrawable extends Drawable {

    public static final int BORDER_NONE = 0;
    public static final int BORDER_TOP = 1;
    public static final int BORDER_RIGHT = 2;
    public static final int BORDER_BOTTOM = 4;
    public static final int BORDER_LEFT = 8;
    public static final int BORDER_FULL = BORDER_TOP | BORDER_RIGHT | BORDER_BOTTOM | BORDER_LEFT;

    @ColorInt private int color = Color.WHITE;
    @ColorInt private int borderColor = Color.BLACK;

    private int border = BORDER_FULL;
    private int borderSize = 1;

    private Paint paint;

    public BackgroundDrawable() {
        paint = new Paint();
        paint.setAntiAlias(false); // no need for antialias since we are drawing only straight lines
    }

    private static void drawFill(Canvas canvas, int color, Paint paint) {
        paint.setStyle(Paint.Style.FILL);
        paint.setColor(color);
        canvas.drawRect(canvas.getClipBounds(), paint);
    }

    private static void drawBorders(Canvas canvas, Paint paint, int border, int color, int borderSize) {
        paint.setStyle(Paint.Style.STROKE);
        paint.setColor(color);
        paint.setStrokeWidth(borderSize);

        if (border == BORDER_FULL) {
            canvas.drawRect(canvas.getClipBounds(), paint);
            return;
        }

        Rect clipBound = canvas.getClipBounds();
        List<Float> points = new ArrayList<>();
        if (hasBorder(border, BORDER_TOP)) {
            points.add((float) clipBound.left); 
            points.add((float) clipBound.top); 
            points.add((float) clipBound.right);
            points.add((float) clipBound.top);
        }

        if (hasBorder(border, BORDER_RIGHT)) {
            points.add((float) clipBound.right); 
            points.add((float) clipBound.top); 
            points.add((float) clipBound.right);
            points.add((float) clipBound.bottom);
        }

        if (hasBorder(border, BORDER_BOTTOM)) {
            points.add((float) clipBound.right); 
            points.add((float) clipBound.bottom); 
            points.add((float) clipBound.left);
            points.add((float) clipBound.bottom);
        }

        if (hasBorder(border, BORDER_RIGHT)) {
            points.add((float) clipBound.right); 
            points.add((float) clipBound.bottom); 
            points.add((float) clipBound.right);
            points.add((float) clipBound.top);
        }

        float lines[] = new float[points.size()];
        for (int i = 0; i < lines.length; i++) {
            lines[i] = points.get(i);
        }
        canvas.drawLines(lines, paint);
    }

    private static boolean hasBorder(int border, int which) {
        return (border & which) != 0;
    }

    @Override
    public void draw(@NonNull Canvas canvas) {
        drawFill(canvas, color, paint);
        drawBorders(canvas, paint, border, borderColor, borderSize);
    }

    @Override
    public void setAlpha(@IntRange(from = 0, to = 255) int i) {

    }

    @Override
    public void setColorFilter(@Nullable ColorFilter colorFilter) {
        paint.setColorFilter(colorFilter);
    }

    @Override
    public int getOpacity() {
        return PixelFormat.OPAQUE;
    }

    public int getColor() {
        return color;
    }

    public void setColor(@ColorInt int color) {
        this.color = color;
    }

    public int getBorderColor() {
        return borderColor;
    }

    public void setBorderColor(@ColorInt int borderColor) {
        this.borderColor = borderColor;
    }

    public void setBorder(int border) {
        this.border = border;
    }

    public int getBorderSize() {
        return borderSize;
    }

    public void setBorderSize(int borderSize) {
        this.borderSize = borderSize;
    }
}