自定义控件-时间轴

由于项目中有需求，就简单的封装一个，先记录一下，有时间上传到github。

1、先增加自定义属性：

2、自定义时间轴类：

/**
     * 时间轴控件
 * 
The following snippet shows how to include a linear layout in your layout XML file:
 *
 * 
    
 *
 * 
The following snippet shows how to java file:
 *  timelineLayout.setPointMarginTop(10)
    timelineLayout.setLineMarginTop(10)
    timelineLayout.setPointMarginTop(40)
    timelineLayout.setInterrupt(true)
 */
class TimeLinearLayout @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null,
                                               defStyleAttr: Int = 0) : LinearLayout(context, attrs, defStyleAttr) {
    private var mContext: Context? = null

    private var mLineMarginLeft: Int = 10
    private var mLineMarginTop: Int = 0
    private var mPointMarginTop: Int = 0
    private var mLineStrokeWidth: Int = 2
    private var mLineColor: Int = 0
    //内圆半径
    private var mPointInnerSize: Int = 8
    //外圆半径
    private var mPointOutSize: Int = 18
    //内圆颜色
    private var mPointInnerColor: Int = 0
    //外圆颜色
    private var mPointOutColor: Int = 0
    //虚线宽
    private var mDashWidth: Int = 0
    //虚线空白宽
    private var mDashGap: Int = 0
    //是否中断
    private var mInterrupt: Boolean = false
    private var mIcon: Bitmap? = null
    //线的画笔
    private var mLinePaint: Paint? = null
    //点的画笔
    private var mPointPaint: Paint? = null

    //第一个点的位置
    private var mFirstX = 0
    private var mFirstY = 0

    //最后一个图标的位置
    private var mLastX = 0
    private var mLastY = 0

    init {
        setLayerType(View.LAYER_TYPE_SOFTWARE, null) //开启硬件加速
        val ta = context.obtainStyledAttributes(attrs, R.styleable.global_TimelineLayout)
        mLineMarginLeft = ta.getDimensionPixelOffset(R.styleable.global_TimelineLayout_global_line_margin_left, 10)
        mLineMarginTop = ta.getDimensionPixelOffset(R.styleable.global_TimelineLayout_global_line_margin_top, 0)
        mPointMarginTop = ta.getDimensionPixelOffset(R.styleable.global_TimelineLayout_global_point_margin_top, 0)
        mLineStrokeWidth = ta.getDimensionPixelOffset(R.styleable.global_TimelineLayout_global_line_stroke_width, 2)
        mLineColor = ta.getColor(R.styleable.global_TimelineLayout_global_line_color, -0xc22e5b)
        mPointInnerSize = ta.getDimensionPixelSize(R.styleable.global_TimelineLayout_global_point_inner_size, 8)
        mPointOutSize = ta.getDimensionPixelSize(R.styleable.global_TimelineLayout_global_point_out_size, 18)
        mPointInnerColor = ta.getColor(R.styleable.global_TimelineLayout_global_point_inner_color, -0xc22e5b)
        mPointOutColor = ta.getColor(R.styleable.global_TimelineLayout_global_point_out_color, -0x170f01)
        mDashGap = ta.getDimensionPixelOffset(R.styleable.global_TimelineLayout_global_dash_gap, 0)
        mDashWidth = ta.getDimensionPixelOffset(R.styleable.global_TimelineLayout_global_dash_width, 0)
        val iconRes = ta.getResourceId(R.styleable.global_TimelineLayout_global_icon_src, View.NO_ID)
        if (iconRes > View.NO_ID) {
            val drawable = ContextCompat.getDrawable(context,iconRes) as? BitmapDrawable
            if (drawable != null) {
                mIcon = drawable.bitmap
            }
        }
        ta.recycle()
        setWillNotDraw(false)
        initView(context)
    }

    fun setLineMarginTop(lineMarginTop:Int){
        this.mLineMarginTop = lineMarginTop
    }

    fun setPointMarginTop(pointMarginTop:Int){
        this.mPointMarginTop = pointMarginTop
    }

    fun setInterrupt(interrupt:Boolean){
        this.mInterrupt = interrupt
    }

    private fun initView(context: Context) {
        mContext = context
        mLinePaint = Paint()
        mLinePaint?.apply {
            isAntiAlias = true
            isDither = true
            color = mLineColor
            strokeWidth = mLineStrokeWidth.toFloat()
            style = Paint.Style.FILL_AND_STROKE
            //虚线设置
            if (mDashGap > 0 && mDashWidth > 0) {
                //mLinePaint.setPathEffect(new DashPathEffect(new float[]{20,5}, 20));
                pathEffect = DashPathEffect(floatArrayOf(mDashWidth.toFloat(), mDashGap.toFloat()), mDashWidth.toFloat())
            }
        }

        mPointPaint = Paint()
        mPointPaint?.apply {
            isAntiAlias = true
            isDither = true
            color = mPointInnerColor
            style = Paint.Style.FILL
        }
    }

    override fun onDraw(canvas: Canvas) {
        super.onDraw(canvas)
        drawTimeline(canvas)
    }

    private fun drawTimeline(canvas: Canvas) {
        drawBetweenLine(canvas)
        drawFirstPoint(canvas)
        drawLastIcon(canvas)
    }

    private fun drawFirstPoint(canvas: Canvas) {
        val top = top
        mFirstX = paddingLeft + mLineMarginLeft + max(mPointOutSize, mPointInnerSize)
        mFirstY = top + paddingTop + mPointMarginTop + max(mPointOutSize, mPointInnerSize)

        //画圆外环
        mPointPaint?.color = mPointOutColor
        canvas.drawCircle(mFirstX.toFloat(), mFirstY.toFloat(), mPointOutSize.toFloat(), mPointPaint)
        //画圆内环
        mPointPaint?.color = mPointInnerColor
        canvas.drawCircle(mFirstX.toFloat(), mFirstY.toFloat(), mPointInnerSize.toFloat(), mPointPaint)
    }

    private fun drawLastIcon(canvas: Canvas) {
        /*if (child != null) {
            int top = child.getTop();
            mLastX = mLineMarginLeft;
            mLastY = top + child.getPaddingTop() + mLineMarginTop;

            //画图
            canvas.drawBitmap(mIcon, mLastX - (mIcon.getWidth() >> 1), mLastY, null);
        }*/
        val top = top
        mLastX = mLineMarginLeft + paddingLeft
        mLastY = top + paddingTop + mLineMarginTop

        //画图
        if (mIcon != null) {
            canvas.drawBitmap(mIcon, mLastX - (mIcon!!.width shr 1).toFloat(), height - mIcon!!.height.toFloat(), null)
        }
    }

    private fun drawBetweenLine(canvas: Canvas) {
        val top = top
        mFirstX = paddingLeft + mLineMarginLeft + max(mPointOutSize, mPointInnerSize)
        mFirstY = top + paddingTop + mLineMarginTop
        mLastX = paddingLeft + mLineMarginLeft + max(mPointOutSize, mPointInnerSize)
        mLastY = if(!mInterrupt) {top + paddingTop + mLineMarginTop + height} else mPointMarginTop

        //从开始的点到最后的图标之间，画一条线
        canvas.drawLine(mFirstX.toFloat(), mFirstY.toFloat(), mLastX.toFloat(), mLastY.toFloat(), mLinePaint)
        //画圆
        //val y = top + paddingTop + mLineMarginTop + mPointInnerSize
        //canvas.drawCircle(mFirstX, y, mPointSize, mPointPaint);
    }

    override fun onMeasure(widthMeasureSpec: Int, heightMeasureSpec: Int) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec)
        val mode = MeasureSpec.getMode(widthMeasureSpec)
        var measuredWidth = MeasureSpec.getSize(widthMeasureSpec)
        val measuredHeight = MeasureSpec.getSize(heightMeasureSpec)
        if (mode == MeasureSpec.AT_MOST) {
            measuredWidth = paddingLeft + mLineMarginLeft + max(mPointOutSize, mPointInnerSize) * 2
        }
        setMeasuredDimension(measuredWidth, measuredHeight)
    }
}

布局中可以直接引用，如下：

也可以在代码里面动态设置相关属性（相关属性注释，在自定义属性时有说明）：

timelineLayout.setPointMarginTop(10)
    timelineLayout.setLineMarginTop(10)
    timelineLayout.setPointMarginTop(40)
    timelineLayout.setInterrupt(true)

仅供大家参考！