前言
最近項目有一個節點進度條的小需求，完成後，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~，註釋已經炒雞詳細了
/**
* @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");
/**
* 繪製的節點個數，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;
/**
* 最後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 座標值
*/
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);
//選中後的文本畫筆
mTextSelPaint.setTextSize(mTextSize);
mTextSelPaint.setColor(mColorSelected);
mTextSelPaint.setAntiAlias(true);
mTextSelPaint.setTextAlign(Paint.Align.CENTER);
}
/**
* 測量文字的長寬，將文字視爲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);
//寬高都設置爲wrap_content
if(widthSpecMode == MeasureSpec.AT_MOST && heightSpecMode == MeasureSpec.AT_MOST){
//寬設置爲wrap_content
setMeasuredDimension(widthSpecSize,defaultHeight);
}else if(widthSpecMode == MeasureSpec.AT_MOST){
setMeasuredDimension(widthSpecSize,heightSpecSize);
}else if(heightSpecMode == MeasureSpec.AT_MOST){
//高設置爲wrap_content
setMeasuredDimension(widthSpecSize, defaultHeight);
}else{
//寬高都設置爲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，則取消繪製
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);
//繪製文字和圓形
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){
//最後一個節點，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();
//繪製
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，節點就會繪製多少個
- 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
- 控件初始化顯示後，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。
由於不同項目設計稿會有不同，這裏也僅僅給有需要的同學一個思路，可以改造具體實現代碼~
謝謝閱讀到這裏的同學~歡迎與我討論和交流