自定义虚线 DashLineView

//自定义虚线控件 可以动态改变虚线颜色 虚线间距 虚线长度 虚线高度

/**
 * 虚线控件
 *
 */
public class DashLineView extends View {
    /**
     * 虚线颜色
     */
    private int dashColor;
    /**
     * 虚线间距
     */
    private float dashGap;
    /**
     * 虚线长度
     */
    private float dashWith;
    /**
     * 虚线高度
     */
    private float lineHegiht;
    private Paint paint;
    private Path path;
    private int widthScreen;

    public DashLineView(Context context) {
        super(context);
        init(context, null);
    }

    public DashLineView(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public DashLineView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context, attrs);
    }

    private void init(Context context, AttributeSet attrs) {
        if (attrs != null) {
            TypedArray typedArray = context.obtainStyledAttributes(attrs, R.styleable.DashLine);
            dashColor = typedArray.getColor(R.styleable.DashLine_dashColor, R.color.black);
            dashGap = typedArray.getDimension(R.styleable.DashLine_dashGap, 5);
            dashWith = typedArray.getDimension(R.styleable.DashLine_dashWith, 15);
            lineHegiht = typedArray.getDimension(R.styleable.DashLine_lineHeight, 3);
            typedArray.recycle();
        }
        paint = new Paint();
        path = new Path();
        //widthScreen = ToolsManager.getInstance().getScreenWidth();
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        paint.setStyle(Paint.Style.STROKE);// 空心
        paint.setColor(dashColor);
        paint.setStrokeWidth(lineHegiht);
        path.moveTo(0, 1);
        path.lineTo(widthScreen, 1);
        // DashPathEffect 可以使用DashPathEffect来创建一个虚线的轮廓(短横线/小圆点)，而不是使用实线
        // float[] { 5, 5, 5, 5 }值控制虚线间距，密度
        PathEffect effects = new DashPathEffect(new float[] { dashWith, dashGap, dashWith, dashGap }, 1);
        paint.setPathEffect(effects);
        canvas.drawPath(path, paint);
    }
    
    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        widthScreen = getMeasuredWidth();
    }

}

<declare-styleable name="DashLine">
        <attr name="dashColor" format="color" />
        <attr name="dashWith" format="dimension" />
        <attr name="dashGap" format="dimension" />
        <attr name="lineHeight" format="dimension" />
    </declare-styleable>