前言

最近項目有一個節點進度條的小需求，完成后，想分享出來希望可以幫到有需要的同學。

真機效果圖

自定義View完整代碼

開箱即用~，注釋已經炒雞詳細了

/** * @description: 節點進度條 * @author: DMingO * @date: 2020/4/15 */public class PointProcessBar extends View { /** * 未選中時的連線畫筆 */ private Paint mLinePaint; /** * 選中時的連線畫筆 */ private Paint mLineSelectedPaint; /** * 未選中時的文字畫筆 */ private Paint mTextPaint; /** * 選中時的文字畫筆 */ private Paint mTextSelPaint; /** * 未選中時的實心圓畫筆 */ private Paint mCirclePaint; /** * 選中時的內部實心圓畫筆 */ private Paint mCircleSelPaint; /** * 選中時的邊框圓畫筆 */ private Paint mCircleStrokeSelPaint; /** * 未選中時的線，節點圓的顏色 */ private int mColorUnselected = Color.parseColor('#1ca8b0d9'); /** * 選中時的顏色 */ private int mColorSelected = Color.parseColor('#61A4E4'); /** * 未選中的文字顏色 */ private int mColorTextUnselected = Color.parseColor('#5c030f09'); /** * 繪制的節點個數，由底部節點標題數量控制 */ int circleCount ; /** * 連線的高度 */ float mLineHeight = 7f; //圓的直徑 float mCircleHeight = 50f; float mCircleSelStroke = 8f; float mCircleFillRadius = 15f; //文字大小 float mTextSize = 35f; //文字離頂部的距離 float mMarginTop = 40f; /** * 首個圓向中心偏移的距離 */ float marginLeft = 30f; /** * 最后一個圓向中心偏移的距離 */ float marginRight = marginLeft; /** * 每個節點相隔的距離 */ float divideWidth; int defaultHeight; /** * 節點底部的文字列表 */ List<String> textList = new ArrayList<>(); /** * 文字同寬高的矩形，用來測量文字 */ List<Rect> mBounds; /** * 存儲每個圓心在同一直線上的節點圓的 x 坐標值 */ List<Float> circleLineJunctions = new ArrayList<>(); /** * 選中項集合 */ Set<Integer> selectedIndexSet = new HashSet<>(); public PointProcessBar(Context context) { super(context); } public PointProcessBar(Context context, @Nullable AttributeSet attrs) { super(context, attrs); initPaint(); } public PointProcessBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } public PointProcessBar(Context context, @Nullable AttributeSet attrs, int defStyleAttr, int defStyleRes) { super(context, attrs, defStyleAttr, defStyleRes); } /** * 初始化畫筆屬性 */ private void initPaint(){ mLinePaint = new Paint(); mLineSelectedPaint = new Paint(); mCirclePaint = new Paint(); mTextPaint = new Paint(); mCircleStrokeSelPaint = new Paint(); mTextSelPaint=new Paint(); mCircleSelPaint = new Paint(); mLinePaint.setColor(mColorDef); //設置填充 mLinePaint.setStyle(Paint.Style.FILL); //筆寬像素 mLinePaint.setStrokeWidth(mLineHeight); //鋸齒不顯示 mLinePaint.setAntiAlias(true); mLineSelectedPaint.setColor(mColorSelected); mLineSelectedPaint.setStyle(Paint.Style.FILL); mLineSelectedPaint.setStrokeWidth(mLineHeight); mLineSelectedPaint.setAntiAlias(true); mCirclePaint.setColor(mColorDef); //設置填充 mCirclePaint.setStyle(Paint.Style.FILL); //筆寬像素 mCirclePaint.setStrokeWidth(1); //鋸齒不顯示 mCirclePaint.setAntiAlias(true); //選中時外框空心圓圈畫筆 mCircleStrokeSelPaint.setColor(mColorSelected); mCircleStrokeSelPaint.setStyle(Paint.Style.STROKE); mCircleStrokeSelPaint.setStrokeWidth(mCircleSelStroke); mCircleStrokeSelPaint.setAntiAlias(true); //選中時的內部填充圓畫筆 mCircleSelPaint.setStyle(Paint.Style.FILL); mCircleSelPaint.setStrokeWidth(1); mCircleSelPaint.setAntiAlias(true); mCircleSelPaint.setColor(mColorSelected); //普通狀態的文本 畫筆 mTextPaint.setTextSize(mTextSize); mTextPaint.setColor(mColorTextDef); mTextPaint.setAntiAlias(true); mTextPaint.setTextAlign(Paint.Align.CENTER); //選中后的文本畫筆 mTextSelPaint.setTextSize(mTextSize); mTextSelPaint.setColor(mColorSelected); mTextSelPaint.setAntiAlias(true); mTextSelPaint.setTextAlign(Paint.Align.CENTER); } /** * 測量文字的長寬，將文字視為rect矩形 */ private void measureText(){ mBounds = new ArrayList<>(); for(String name : textList){ Rect mBound = new Rect(); mTextPaint.getTextBounds(name, 0, name.length(), mBound); mBounds.add(mBound); } } /** * 測量view的高度 */ private void measureHeight(){ if (mBounds!=null && mBounds.size()!=0) { defaultHeight = (int) (mCircleHeight + mMarginTop + mCircleSelStroke + mBounds.get(0).height()/2); } else { defaultHeight = (int) (mCircleHeight + mMarginTop+mCircleSelStroke); } } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { int widthSpecMode = MeasureSpec.getMode(widthMeasureSpec); int widthSpecSize = MeasureSpec.getSize(widthMeasureSpec); int heightSpecMode = MeasureSpec.getMode(heightMeasureSpec); int heightSpecSize = MeasureSpec.getSize(heightMeasureSpec); //寬高都設置為wrap_content if(widthSpecMode == MeasureSpec.AT_MOST && heightSpecMode == MeasureSpec.AT_MOST){ //寬設置為wrap_content setMeasuredDimension(widthSpecSize,defaultHeight); }else if(widthSpecMode == MeasureSpec.AT_MOST){ setMeasuredDimension(widthSpecSize,heightSpecSize); }else if(heightSpecMode == MeasureSpec.AT_MOST){ //高設置為wrap_content setMeasuredDimension(widthSpecSize, defaultHeight); }else{ //寬高都設置為match_parent或具體的dp值 setMeasuredDimension(widthSpecSize, heightSpecSize); } } @Override protected void onDraw(Canvas canvas) { //若未設置節點標題或者選中項的列表，則取消繪制 if (textList == null || textList.isEmpty() ||selectedIndexSet == null || selectedIndexSet.isEmpty() ||mBounds == null || mBounds.isEmpty()) { return; } //畫灰色圓圈的個數 circleCount=textList.size(); //每個圓相隔的距離（重要），可以通過這個調節節點間距 divideWidth = (getWidth() - mCircleHeight ) / (circleCount - 1); //繪制文字和圓形 for (int i=0; i < circleCount ;i++){ float cx; float cy; float textX; if (i==0){//第一個節點，圓心需要向右偏移cx = mCircleHeight / 2 + i * divideWidth + marginLeft;cy = mCircleHeight / 2 + mCircleSelStroke;textX = cx;circleLineJunctions.add(cx + mCircleHeight / 2); }else if (i==textList.size()-1){//最后一個節點，圓心需要向左偏移cx = mCircleHeight / 2 + i * divideWidth - marginRight;cy = mCircleHeight / 2 + mCircleSelStroke;textX = cx;circleLineJunctions.add(cx - mCircleHeight / 2); }else {//中間部分的節點cx = mCircleHeight / 2 + i * divideWidth;cy = mCircleHeight / 2+mCircleSelStroke;textX = cx;circleLineJunctions.add(cx - mCircleHeight / 2);circleLineJunctions.add(cx + mCircleHeight / 2); } if (getSelectedIndexSet().contains(i)){//若當前位置節點被包含在選中項Set中，判定此節點被選中canvas.drawCircle(cx , cy, mCircleHeight / 2, mCircleStrokeSelPaint);canvas.drawCircle(cx, cy, mCircleFillRadius, mCircleSelPaint);canvas.drawText(textList.get(i), textX, (float) (mCircleHeight + mMarginTop +mCircleSelStroke+mBounds.get(i).height()/2.0), mTextSelPaint); }else {//若當前位置節點沒有被包含在選中項Set中，判定此節點沒有被選中canvas.drawCircle(cx , cy, mCircleHeight / 2, mCirclePaint);canvas.drawText(textList.get(i), textX, (float) (mCircleHeight + mMarginTop +mCircleSelStroke+mBounds.get(i).height()/2.0), mTextPaint); } } for(int i = 1 , j = 1 ; j <= circleLineJunctions.size() && ! circleLineJunctions.isEmpty() ; ++i , j=j+2){ if(getSelectedIndexSet().contains(i)){canvas.drawLine(circleLineJunctions.get(j-1),mCircleHeight/2+mCircleSelStroke, circleLineJunctions.get(j) ,mCircleHeight/2+mCircleSelStroke,mLineSelectedPaint); }else {canvas.drawLine(circleLineJunctions.get(j-1),mCircleHeight/2+mCircleSelStroke, circleLineJunctions.get(j) ,mCircleHeight/2+mCircleSelStroke,mLinePaint); } } } /** * 供外部調用，顯示控件 * @param titles 底部標題內容列表 * @param indexSet 選中項Set */ public void show(List<String> titles , Set<Integer> indexSet){ if(titles != null && ! titles.isEmpty()){ this.textList = titles; } if(indexSet != null && ! indexSet.isEmpty()){ this.selectedIndexSet = indexSet; } measureText(); measureHeight(); //繪制 invalidate(); } /** * 更新底部節點標題內容 * @param textList 節點標題內容列表 */ public void refreshTextList(List<String> textList) { this.textList = textList; measureText(); measureHeight(); invalidate(); } /** * 獲取節點選中狀態 * @return 節點選中狀態列表 */ public Set<Integer> getSelectedIndexSet() { return selectedIndexSet; } /** * 更新選中項 * @param set 選中項Set */ public void refreshSelectedIndexSet(Set<Integer> set) { this.selectedIndexSet = set; invalidate(); }}

注意點

控件的節點總個數是與傳入的節點底部標題列表中元素個數控制（相同）的，簡而言之就是傳入的標題列表中有多少個標題，節點就會繪制多少個 控件通過show方法進行View的初始化和顯示內容，傳入節點標題列表和節點選中項集合，控制View的選中狀態和顯示的內容 控件初始化顯示后，可以通過refreshTextList(),refreshSelectedIndexSet() 更新標題和選中項 具體不同的顏色，大小可以具體在View中調整

總結

可以看到效果不復雜，因此自定義View的代碼行數不多，也很容易看懂，直接拿走代碼即可在項目中食用啦。

由于不同項目設計稿會有不同，這里也僅僅給有需要的同學一個思路，可以改造具體實現代碼~

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