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(jù)一個月得總天數(shù)，和一條線上需要畫七個圖，計算出總共需要畫出的線條數(shù)，以及畫出左邊和右邊的弧度，根據(jù)當前線是單數(shù)還是雙數(shù)，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(shù)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(shù)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(shù)，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(jié)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(shù) * * @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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