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這篇文章將為大家詳細講解有關怎么在Android中實現一個簽到足跡功能，文章內容質量較高，因此小編分享給大家做個參考，希望大家閱讀完這篇文章后對相關知識有一定的了解。
@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);
}
}
}
}// 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.SignInView android:layout_width="match_parent" android:layout_height="match_parent" android:visibility="visible"/>
關于怎么在Android中實現一個簽到足跡功能就分享到這里了，希望以上內容可以對大家有一定的幫助，可以學到更多知識。如果覺得文章不錯，可以把它分享出去讓更多的人看到。
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