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UI 妹紙又給了個(gè)圖叫我做，我一看是這樣的：

我們首先把這個(gè)控件劃分成幾個(gè)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(biāo) ：
4.最后的文字說(shuō)明：

首先我們把線畫(huà)出來(lái)，大概這個(gè)樣子

我們這里根據(jù)一個(gè)月得總天數(shù)，和一條線上需要畫(huà)七個(gè)圖，計(jì)算出總共需要畫(huà)出的線條數(shù)，以及畫(huà)出左邊和右邊的弧度，根據(jù)當(dāng)前線是單數(shù)還是雙數(shù)，來(lái)計(jì)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?yàn)樽詈笠粭l線不需要畫(huà)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(lái)判斷，是否需要畫(huà)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(huà)出禮物數(shù)量

            // 這里是來(lái)判斷，本次這根線上畫(huà)出的禮物的點(diǎn)，以及順序是順畫(huà)，還是倒畫(huà)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(gè)需要注意的地方，就是，在線為雙數(shù)的時(shí)候，這時(shí)候禮物的排列是需要反過(guò)來(lái)排列的，我這里使用了一個(gè)LinkedList來(lái)保存禮物的排列順序，然后我們通過(guò)計(jì)算平均數(shù)，計(jì)算出每個(gè)禮物的位置。

    /**     * 畫(huà)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(gè)需要注意的地方，就是，當(dāng)最后一條線是短的時(shí)候，這個(gè)時(shí)候，你的禮物的排列需要按照那條線的開(kāi)始位置和結(jié)束位置來(lái)平均計(jì)算每個(gè)禮物的位置。

最后，我們?cè)谧詈笠粭l線最后的位置，畫(huà)出文字

/**     * 畫(huà)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(jì)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(shè)置本月天數(shù)     *     * @param monthDays     */    public void setMonthDays(int monthDays) {        this.monthDays = monthDays;        if (monthDays == 0) {            this.monthDays = 31;        }        postInvalidate();    }
    /**     * 設(shè)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(lái)判斷，是否需要畫(huà)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(lái)判斷，本次這根線上畫(huà)出的禮物的點(diǎn)，以及順序是順畫(huà)，還是倒畫(huà)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(huà)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(huà)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.SignInView        android:layout_width="match_parent"        android:layout_height="match_parent"        android:visibility="visible"/>

需要源碼的童鞋在公眾號(hào)【龍旋】對(duì)話框中發(fā)送關(guān)鍵字【簽到足跡】即可獲取哦，由于demo集合比較多，單這篇看下面代碼即可：

到這里就結(jié)束啦.

Android實(shí)現(xiàn)簽到足跡功能