package com.zms.timelineview;import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Rect;import android.util.AttributeSet;import android.view.View;public class TimeLineView extends View { private Paint mPaint; /** * 首個節點的外半徑 */ private float timelineHeadRadius; /** * 首個節點的中心顏色 */ private int timelineHeadColor; /** * 首個節點的邊緣顏色 */ private int timelineHeadColorEdge; /** * 其他節點的顏色值 */ private int timelineOtherColor; /** * 時間線的節點數 */ private int timelineCount; /** * 時間軸的位置 */ private int viewWidth; /** * 時間軸到距離頂部的距離 */ private int marginTop; /** * 時間軸的節點的半徑 */ private int timelineRadius; /** * 時間軸節點之間的距離 */ private int timelineRadiusDistance; /** * 時間軸的寬度 */ private int timelineWidth; /** * 時間軸的高度 */ private float timeLineViewHeight; public TimeLineView(Context context) { this(context, null); } public TimeLineView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public TimeLineView(Context context, AttributeSet attrs, int defStyle) { super(context, attrs, defStyle); init(context, attrs, defStyle); } /** * 初始化 *  * @param context * @param attrs * @param defStyle */ private void init(Context context, AttributeSet attrs, int defStyle) { final TypedArray a = getContext().obtainStyledAttributes(attrs,  R.styleable.TimeLineView, defStyle, 0); timelineRadiusDistance = (int) a.getDimension(  R.styleable.TimeLineView_timelineRadiusDistance,  convertDIP2PX(context, 20)); timelineHeadRadius = a.getDimension(  R.styleable.TimeLineView_timelineHeadRadius,  convertDIP2PX(context, 6)); timelineRadius = (int) a.getDimension(  R.styleable.TimeLineView_timelineRadius,  convertDIP2PX(context, 5)); timelineHeadColor = a.getColor(  R.styleable.TimeLineView_timelineHeadColor,  Color.parseColor("#25ae5f")); // 中心深色 timelineHeadColorEdge = a.getColor(  R.styleable.TimeLineView_timelineHeadColorEdge,  Color.parseColor("#b9e5cc")); // 邊緣淺色 timelineOtherColor = a.getColor(  R.styleable.TimeLineView_timelineOtherColor,  Color.parseColor("#cccccc")); timelineCount = a.getInteger(R.styleable.TimeLineView_timelineCount, 0); timelineWidth = (int) a.getDimension(  R.styleable.TimeLineView_timelineWidth,  convertDIP2PX(context, 1)); marginTop = (int) a.getDimension(  R.styleable.TimeLineView_timelineMarginTop,  convertDIP2PX(context, 50)); a.recycle(); mPaint = new Paint(); mPaint.setAntiAlias(true); } @Override protected void onDraw(Canvas canvas) { // 默認設置時間軸的位置位于view的中間 viewWidth = getMeasuredWidth() / 2; // 設置第一個節點的顏色 mPaint.setColor(timelineHeadColor); /**  * 根據時間軸的節點數目，畫對應的節點和軸  */ for (int j = 1; j <= timelineCount; j++) {  /**  * 當j==1，畫第一個節點的時候，有點特殊，我們需要在節點的外面再換一個圓環  */  if (j == 1) {  // 畫筆設置為空心  canvas.drawCircle(viewWidth, timelineHeadRadius + marginTop,   timelineRadius, mPaint);  mPaint.setStyle(Paint.Style.STROKE);  mPaint.setStrokeWidth(5.0f);  // 畫第一個節點外圍的圓環  mPaint.setColor(timelineHeadColorEdge);  canvas.drawCircle(viewWidth, timelineHeadRadius + marginTop,   timelineHeadRadius, mPaint);  // 設置畫筆顏色，畫其他時間節點的顏色  mPaint.setColor(timelineOtherColor);  // 畫筆設置為實心  mPaint.setStyle(Paint.Style.FILL);  /**   * 畫第一個節點下面的軸   */  canvas.drawRect(new Rect(viewWidth - timelineWidth / 2,   (int) (2 * timelineHeadRadius + marginTop) + 5,   viewWidth + timelineWidth / 2, (int) (2    * timelineHeadRadius + timelineRadiusDistance    + marginTop + 5)), mPaint);  continue;  }  /**  * 畫時間軸的節點,即畫圓形 圓心的x都是一樣的,view的中間  * 圓心的y的計算是根據節點的位置來計算的,例如:第一個節點的y是根據第一個節點距離上面的距離加上第一個節點的半徑  * :timelineHeadRadius + marginTop  * 其余的節點就是在一個節點的y的基礎上,加上兩倍半徑和節點之間的軸的長度＊節點數:(2 * timelineRadius +  * timelineRadiusDistance) * (j - 1) + timelineHeadRadius -  * timelineRadius + marginTop  *   */  canvas.drawCircle(viewWidth,   (2 * timelineRadius + timelineRadiusDistance) * (j - 1) + 2    * timelineHeadRadius - timelineRadius + marginTop,   timelineRadius, mPaint);  /**  * 　 畫其余的軸 left:每個軸距離左邊距離都是一樣的　　　時間軸的中心位置-1/2的時間軸的寬度 viewWidth -  * timelineWidth / 2 top: (int) (j * (2 * timelineRadius +  * timelineRadiusDistance) - timelineRadiusDistance + 2 *  * (timelineHeadRadius-timelineRadius)+ marginTop)　  * right:每個軸距離右邊距離都是一樣的　　　時間軸的中心位置+1/2的時間軸的寬度 viewWidth +  * timelineWidth / 2 bottom: (int) (j * (2 * timelineRadius +  * timelineRadiusDistance) + 2 *  * (timelineHeadRadius-timelineRadius)+ marginTop)  */  canvas.drawRect(   new Rect(    viewWidth - timelineWidth / 2,    (int) (j     * (2 * timelineRadius + timelineRadiusDistance)     - timelineRadiusDistance + 2     * (timelineHeadRadius - timelineRadius) + marginTop),    viewWidth + timelineWidth / 2,    (int) (j     * (2 * timelineRadius + timelineRadiusDistance)     + 2 * (timelineHeadRadius - timelineRadius) + marginTop)),   mPaint); } } public float getTimelineHeadRadius() { return timelineHeadRadius; } public void setTimelineHeadRadius(float timelineHeadRadius) { this.timelineHeadRadius = timelineHeadRadius; invalidate(); } public int getTimelineHeadColor() { return timelineHeadColor; } public void setTimelineHeadColor(int timelineHeadColor) { this.timelineHeadColor = timelineHeadColor; invalidate(); } public int getTimelineOtherColor() { return timelineOtherColor; } public void setTimelineOtherColor(int timelineOtherColor) { this.timelineOtherColor = timelineOtherColor; invalidate(); } public int getTimelineCount() { return timelineCount; } public void setTimelineCount(int timelineCount) { this.timelineCount = timelineCount; invalidate(); } public int getMarginTop() { return marginTop; } public void setMarginTop(int marginTop) { this.marginTop = marginTop; invalidate(); } public int getTimelineRadius() { return timelineRadius; } public void setTimelineRadius(int timelineRadius) { this.timelineRadius = timelineRadius; invalidate(); } public int getTimelineRadiusDistance() { return timelineRadiusDistance; } public void setTimelineRadiusDistance(int timelineRadiusDistance) { this.timelineRadiusDistance = timelineRadiusDistance; invalidate(); } public int getTimelineWidth() { return timelineWidth; } public void setTimelineWidth(int timelineWidth) { this.timelineWidth = timelineWidth; } public float getTimeLineViewHeight() { this.timeLineViewHeight = getMarginTop() + getTimelineCount()  * (2 * getTimelineRadius() + getTimelineRadiusDistance()); return timeLineViewHeight; } public void setTimeLineViewHeight(float timeLineViewHeight) { this.timeLineViewHeight = timeLineViewHeight; invalidate(); } public int getViewWidth() { return viewWidth; } public void setViewWidth(int viewWidth) { this.viewWidth = viewWidth; invalidate(); } /** * 轉換dip為px */ public static int convertDIP2PX(Context context, int dip) { float scale = context.getResources().getDisplayMetrics().density; return (int) (dip * scale + 0.5f * (dip >= 0 ? 1 : -1)); }}