UI 妹紙又給了個圖叫我做，我一看是這樣的：

我們首先把這個控件劃分成 幾個部分：

1.底下部分的直線 ：

2.左右兩邊的半圓弧度 ：

3.線上面的小圖標 ：

4.最后的文字說明 ：

我們這里根據一個月得總天數，和一條線上需要畫七個圖，計算出總共需要畫出的線條數，以及畫出左邊和右邊的弧度，根據當前線是單數還是雙數，來計算出是否是左半邊的弧度，還是右半邊的弧度，以及是否是最后的一條線，因為最后一條線不需要畫弧度。

代碼如下：

@Override protected void onDraw(Canvas canvas){paint.setColor(backColor);paint.setStrokeWidth(strokeWidth);int rowCount = (monthDays % 7 == 0 ? monthDays / 7 : monthDays / 7 + 1);int rowHeigh = height / (rowCount);int startX = 0 + rowHeigh / 2;int endX = width - rowHeigh / 2;int days = 0;for (int a = 0; a < rowCount; a++){ if (a + 1 == rowCount) {endX = (endX - startX) / 7 * (monthDays % 7) + checkBitmap.getWidth() / 2; } paint.setStrokeWidth(strokeWidth); int y = rowHeigh * a + rowHeigh / 2; canvas.drawLine(startX, y, endX, y, paint); paint.setColor(rashColor); paint.setStrokeWidth(1); canvas.drawLine(startX, y, endX, y, paint); // 這里是來判斷，是否需要畫出左半邊還是右半邊的半圓弧度？ if (a % 2 != 0) {if (a + 1 != rowCount){ drawLeftOrRightArc(true, canvas, 0 + strokeWidth, y, 0 + rowHeigh + strokeWidth, y + rowHeigh);} } else {if (a + 1 != rowCount){ drawLeftOrRightArc(false, canvas, endX - rowHeigh / 2 - strokeWidth, y, endX + rowHeigh / 2 - strokeWidth, y + rowHeigh);} }} }然后再在線上畫出禮物數量

// 這里是來判斷，本次這根線上畫出的禮物的點，以及順序是順畫，還是倒畫出。 bitmapList.clear(); for (int b = 0; b < (a + 1 == rowCount ? (monthDays % 7) : 7); b++) {days++;if (days <= signInCount){ if (days == 3 || days == 8 || days == 14 || days == 21 || days == monthDays) {bitmapList.add(a % 2 != 0 ? 0 : bitmapList.size(), openGiftBitmap); } else {bitmapList.add(a % 2 != 0 ? 0 : bitmapList.size(), checkBitmap); }} else{ if (days == 3 || days == 8 || days == 14 || days == 21 || days == monthDays) {bitmapList.add(a % 2 != 0 ? 0 : bitmapList.size(), closeGiftBitmap); } else {bitmapList.add(a % 2 != 0 ? 0 : bitmapList.size(), uncheckBitmap); }} }

這里有一個需要注意的地方，就是，在線為雙數的時候，這時候禮物的排列是需要反過來排列的，我這里使用了一個LinkedList來保存禮物的排列順序，然后我們通過計算平均數，計算出每個禮物的位置。

/** * 畫出的按路線上的圖片，勾選，禮物 * @param bitmapList * @param startX * @param endX * @param y * @param canvas */ private void drawImgs(List<Bitmap> bitmapList, float startX, float endX, float y, Canvas canvas){startX = startX - bitmapList.get(0).getWidth() / 2;int count = bitmapList.size();float bitmap_width = (endX - startX) / (count - 1);for (int a = 0; a < count; a++){ Bitmap bitmap = bitmapList.get(a); canvas.drawBitmap(bitmap, startX + (bitmap_width * a), y - bitmap.getHeight() / 2, paint);} }

這里也有一個需要注意的地方，就是，當最后一條線是短的時候，這個時候，你的禮物的排列需要按照那條線的開始位置和結束位置來平均計算每個禮物的位置。

/** * 畫出文字 * @param canvas * @param y * @param x */ private void drawText(Canvas canvas, float y, float x){int oldColor = paint.getColor();Paint.Style old_style = paint.getStyle();paint.setStyle(Paint.Style.FILL);paint.setColor(textColor);String drawText = '已累計簽到'+signInCount+'天';paint.setTextSize(DensityUtil.sp2px(getContext(), 15));int textHeigh = getStringHeight(drawText);int textWidth = getStringWidth(drawText);canvas.drawText(drawText, x + textWidth/2, y + textHeigh / 2, paint);paint.setColor(oldColor);paint.setStyle(old_style); }

好了，這就是所有的思路。下面貼一下最新完整代碼：

package com.sjl.keeplive.track;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;import com.sjl.keeplive.R;import java.util.LinkedList;import java.util.List;public class SignInView extends View { private int width, height; private int monthDays = 31;//本月有31天 private Paint paint; private RectF oval = new RectF(); private float strokeWidth = 10; private Bitmap checkBitmap, uncheckBitmap, closeGiftBitmap, openGiftBitmap; private int backColor = Color.parseColor('#C3DEEA'), rashColor = Color.parseColor('#B2CADB'), textColor = Color.parseColor('#60ADE5'); private List<Bitmap> bitmapList = new LinkedList<>(); private int signInCount = 9; public SignInView(Context context) {this(context, null); } public SignInView(Context context, @Nullable AttributeSet attrs) {this(context, attrs, 0); } public SignInView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {super(context, attrs, defStyleAttr);init(context, attrs); } private void init(Context context, AttributeSet attrs) {paint = new Paint();paint.setAntiAlias(true);strokeWidth = DensityUtil.dip2px(6);checkBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon_sign_in_check_img);uncheckBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon_sign_in_uncheck_img);closeGiftBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon_close_gift_img);openGiftBitmap = BitmapFactory.decodeResource(getResources(), R.drawable.icon_open_gift_img); } @Override protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {height = MeasureSpec.getSize(heightMeasureSpec);width = MeasureSpec.getSize(widthMeasureSpec);super.onMeasure(widthMeasureSpec, heightMeasureSpec); } /** * 設置本月天數 * * @param monthDays */ public void setMonthDays(int monthDays) {this.monthDays = monthDays;if (monthDays == 0) { this.monthDays = 31;}postInvalidate(); } /** * 設置一共簽到了幾天 * * @param days */ public void setProgress(int days) {this.signInCount = days;postInvalidate(); } @Override protected void onDraw(Canvas canvas) {paint.setColor(backColor);paint.setStrokeWidth(strokeWidth);int rowCount = (monthDays % 7 == 0 ? monthDays / 7 : monthDays / 7 + 1);int rowHeigh = height / (rowCount);int startX = 0 + rowHeigh / 2;int endX = width - rowHeigh / 2;int days = 0;for (int a = 0; a < rowCount; a++) { if (a + 1 == rowCount) {endX = (endX - startX) / 7 * (monthDays % 7 == 0 ? 7 : (monthDays % 7)) + checkBitmap.getWidth() / 2; } paint.setStrokeWidth(strokeWidth); int y = rowHeigh * a + rowHeigh / 2; canvas.drawLine(startX, y, endX, y, paint); paint.setColor(rashColor); paint.setStrokeWidth(1); canvas.drawLine(startX, y, endX, y, paint); // 這里是來判斷，是否需要畫出左半邊還是右半邊的半圓弧度？ if (a % 2 != 0) {if (a + 1 != rowCount) { drawLeftOrRightArc(true, canvas, 0 + strokeWidth, y, 0 + rowHeigh + strokeWidth, y + rowHeigh);} } else {if (a + 1 != rowCount) { drawLeftOrRightArc(false, canvas, endX - rowHeigh / 2 - strokeWidth, y, endX + rowHeigh / 2 - strokeWidth, y + rowHeigh);} } // 這里是來判斷，本次這根線上畫出的禮物的點，以及順序是順畫，還是倒畫出。 bitmapList.clear(); int lastDay = (monthDays % 7) == 0 ? 7 : (monthDays % 7); for (int b = 0; b < (a + 1 == rowCount ? (lastDay) : 7); b++) {days++;if (days <= signInCount) { if (days == 3 || days == 8 || days == 14 || days == 21 || days == monthDays) {bitmapList.add(a % 2 != 0 ? 0 : bitmapList.size(), openGiftBitmap); } else {bitmapList.add(a % 2 != 0 ? 0 : bitmapList.size(), checkBitmap); }} else { if (days == 3 || days == 8 || days == 14 || days == 21 || days == monthDays) {bitmapList.add(a % 2 != 0 ? 0 : bitmapList.size(), closeGiftBitmap); } else {bitmapList.add(a % 2 != 0 ? 0 : bitmapList.size(), uncheckBitmap); }} } drawImgs(bitmapList, startX, endX, y, canvas);}super.onDraw(canvas); } /** * 畫出的按路線上的圖片，勾選，禮物 * * @param bitmapList * @param startX * @param endX * @param y * @param canvas */ private void drawImgs(List<Bitmap> bitmapList, float startX, float endX, float y, Canvas canvas) {if (!bitmapList.isEmpty()) { startX = startX - bitmapList.get(0).getWidth() / 2; int count = bitmapList.size(); float bitmap_width = (endX - startX) / (count - 1); for (int a = 0; a < count; a++) {Bitmap bitmap = bitmapList.get(a);canvas.drawBitmap(bitmap, startX + (bitmap_width * a), y - bitmap.getHeight() / 2, paint); }} } /** * 這里畫出左邊半圓弧，還是右邊半圓弧 * * @param isLeft * @param canvas * @param left * @param top * @param right * @param bottom */ private void drawLeftOrRightArc(boolean isLeft, Canvas canvas, float left, float top, float right, float bottom) {paint.setStrokeWidth(strokeWidth);paint.setColor(backColor);if (isLeft) { paint.setStyle(Paint.Style.STROKE); oval.setEmpty(); oval.set(left, top, right, bottom); canvas.drawArc(oval, 90, 180, false, paint); paint.setStrokeWidth(1); paint.setColor(rashColor); canvas.drawArc(oval, 90, 180, false, paint);} else { paint.setStyle(Paint.Style.STROKE); oval.setEmpty(); oval.set(left, top, right, bottom); canvas.drawArc(oval, 270, 180, false, paint); paint.setStrokeWidth(1); paint.setColor(rashColor); canvas.drawArc(oval, 270, 180, false, paint);}paint.setStrokeWidth(strokeWidth);paint.setColor(backColor); }}

布局文件使用：

<com.sjl.keeplive.track.SignInViewandroid:layout_width='match_parent'android:layout_height='match_parent'android:visibility='visible'/>

項目地址：

鏈接：https://pan.baidu.com/s/1IUh9og2T3IlxeXhaLLOKGg 提取碼：thoc

由于demo集合比較多，單這篇看下面代碼即可：

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