Android自定义控件（状态提示图表），牛逼
本文在开源项目GitHub中已收录，里面包含不同方向的自学编程路线、面试题集合/面经、及系列技术文章等，资源持续更新中…目前已经更新的部分资料，需要的自己取：自我介绍一下，小编13年上海交大毕业，曾经在小公司待过，也去过华为、OPPO等大厂，18年进入阿里一直到现在。深知大多数初中级安卓工程师，想要提升技能，往往是自己摸索成长，但自己不成体系的自学效果低效又漫长，而且极易碰到天花板技术停滞不前！
文章共2,254字 · 阅读需要大约8分钟
private int mWidth, mHight;
private int mRealWidth, mRealHight;
private String mTitleY, mTitleX;
private ArrayList mXLevel = new ArrayList<>();
private ArrayList mYLevel = new ArrayList<>();
private ArrayList mGridLevelText = new ArrayList<>();
private ArrayList mGridColorLevel = new ArrayList<>();
private ArrayList mGridTxtColorLevel = new ArrayList<>();
private int mGridLevel = mXLevel.size() - 1;
//title字符大小
private int mXYTitleTextSize = 40;
private int mMeasureXpos, mMeasureYpos;
public AreaChartsView(Context context, AttributeSet attrs) {
super(context, attrs);
mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
mPaint.setAntiAlias(true);
mPaint.setFilterBitmap(true);
}
@Override
protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
super.onLayout(changed, left, top, right, bottom);
mWidth = getWidth();
mHight = getHeight();
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
initPosition();
drawXYTitle(canvas);
drawXYLine(canvas);
drawContent(canvas);
}
private void initPosition() {
//初始化坐标图的xy交点原点坐标
mZeroPos[0] = mXYTitleTextSize * 2;
mZeroPos[1] = mHight - mXYTitleTextSize * 4;
//初始化坐标图的X轴最大值坐标
mMaxXPos[0] = mWidth;
mMaxXPos[1] = mHight - mXYTitleTextSize * 4;
//初始化坐标图的Y轴最大值坐标
mMaxYPos[0] = mXYTitleTextSize * 2;
mMaxYPos[1] = mXYTitleTextSize * 2;
}
private void drawXYTitle(Canvas canvas) {
mPaint.setColor(Color.parseColor(“#1FB0E7”));
mPaint.setTextSize(mXYTitleTextSize);
mPaint.setTextAlign(Paint.Align.LEFT);
//画Y轴顶的title
canvas.drawText(mTitleY, mMaxYPos[0] - mXYTitleTextSize * 2, mMaxYPos[1] - mXYTitleTextSize, mPaint);
mPaint.setTextAlign(Paint.Align.RIGHT);
//画X轴顶的title
canvas.drawText(mTitleX, mMaxXPos[0], mMaxXPos[1] + mXYTitleTextSize * 2, mPaint);
}
private void drawXYLine(Canvas canvas) {
mPaint.setColor(Color.DKGRAY);
mPaint.setTextAlign(Paint.Align.RIGHT);
//画XY轴
canvas.drawLine(mMaxYPos[0], mMaxYPos[1], mZeroPos[0], mZeroPos[1], mPaint);
canvas.drawLine(mZeroPos[0], mZeroPos[1], mMaxXPos[0], mMaxXPos[1], mPaint);
}
private void drawContent(Canvas canvas) {
mGridLevel = mXLevel.size() - 1;
//计算出偏移title等显示尺标后的真实XY轴长度，便于接下来等分
mRealWidth = (mWidth - mXYTitleTextSize * 2);
mRealHight = (mHight - mXYTitleTextSize * 4);
//算出等分间距
int offsetX = mRealWidth/(mGridLevel);
int offsetY = mRealHight/(mGridLevel+1);
//循环绘制content
for (int index=0; index<mGridLevel+1; index++) {
mPaint.setColor(Color.DKGRAY);
mPaint.setTextAlign(Paint.Align.RIGHT);
mPaint.setTextSize(mXYTitleTextSize-5);
//绘制X轴的那些坐标区间点，包含0点坐标
canvas.drawText(String.valueOf(mXLevel.get(index)), mZeroPos[0]+(index*offsetX), mZeroPos[1] + mXYTitleTextSize, mPaint);
if (index != 0) {
//绘制Y轴坐标区间点，不包含0点坐标，X轴已经画过了
canvas.drawText(String.valueOf(mYLevel.get(index)), mZeroPos[0], mZeroPos[1]-(index*offsetY), mPaint);
}
if (index == mGridLevel) {
//坐标区间 = 真实区间 + 1
break;
}
mPaint.setColor(mGridColorLevel.get(mGridLevel - 1 - index));
mPaint.setStyle(Paint.Style.FILL);
//绘制区间叠加图谱方块，从远到0坐标，因为小的图会覆盖大的图
canvas.drawRect(mMaxYPos[0], mMaxYPos[1] + indexoffsetY, mMaxXPos[0]-indexoffsetX, mMaxXPos[1], mPaint);
mPaint.setColor(mGridTxtColorLevel.get(index));
mPaint.setTextAlign(Paint.Align.RIGHT);
mPaint.setTextSize(mXYTitleTextSize);
//绘制每个方块状态区间的提示文字
canvas.drawText(mGridLevelText.get(index), mMaxXPos[0] - index * offsetX - mXYTitleTextSize,
mMaxYPos[1] + index * offsetY + mXYTitleTextSize, mPaint);
}
//绘制当前坐标
drawNotice(canvas, offsetX, offsetY);
}
private void drawNotice(Canvas canvas, int offsetX, int offsetY) {
int realPosX = 0;
int realPosY = 0;
//计算传入的x值与真实屏幕坐标的像素值的百分比差值转换
for (int index=0; index<mGridLevel; index++) {
if (mMeasureXpos >= mXLevel.get(index) && mMeasureXpos < mXLevel.get(index+1)) {
int subValue = mMeasureXpos - mXLevel.get(index);
int offset = mXLevel.get(index+1) - mXLevel.get(index);
realPosX = mZeroPos[0] + index*offsetX + (subValue / offset);
break;
}
}
//计算传入的y值与真实屏幕坐标的像素值的百分比差值转换
for (int index=0; index<mGridLevel; index++) {
if (mMeasureYpos >= mYLevel.get(index) && mMeasureYpos < mYLevel.get(index+1)) {
int subValue = mMeasureYpos - mYLevel.get(index);
int offset = mYLevel.get(index+1) - mYLevel.get(index);
realPosY = mZeroPos[1] - index*offsetY - (offsetY - (subValue / offset));
break;
}
}
//画我们传入的坐标点的标记小红点
mPaint.setColor(Color.RED);
mPaint.setStyle(Paint.Style.FILL);
canvas.drawCircle(realPosX, realPosY, 8, mPaint);
int[] centerPos = {mZeroPos[0] + mRealWidth/2, mZeroPos[1] - mRealHight/2};
mPaint.setColor(Color.WHITE);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
RectF rectF = null;
Path path = new Path();
//画红点旁边的提示框和文字，有四个区域，然后提示框的小三角指标方位不同
if (realPosX <= centerPos[0] && realPosY >= centerPos[1]) {
//left-bottom
//画三角形
path.moveTo(realPosX+5, realPosY+5);
path.lineTo(realPosX+15, realPosY+15);
path.lineTo(realPosX+15, realPosY-15);
//画矩形背景
rectF = new RectF(realPosX+15, realPosY-40, realPosX+200, realPosY + 30);
canvas.drawRoundRect(rectF, 15, 15, mPaint);
//画提示框的文字
mPaint.reset();
mPaint.setColor(Color.RED);
mPaint.setTextSize(mXYTitleTextSize - 5);
canvas.drawText(“(”+mMeasureXpos+“, “+mMeasureYpos+”)”, realPosX+30, realPosY, mPaint);
}
else if (realPosX <= centerPos[0] && realPosY < centerPos[1]) {
//left-top
path.moveTo(realPosX+5, realPosY+5);
path.lineTo(realPosX+15, realPosY+15);
path.lineTo(realPosX + 15, realPosY - 15);
rectF = new RectF(realPosX+15, realPosY - 20, realPosX+200, realPosY + 50);
canvas.drawRoundRect(rectF, 15, 15, mPaint);
mPaint.reset();
mPaint.setColor(Color.RED);
mPaint.setTextSize(mXYTitleTextSize - 5);
canvas.drawText(“(”+mMeasureXpos+“, “+mMeasureYpos+”)”, realPosX+30, realPosY+20, mPaint);
}
else if (realPosX > centerPos[0] && realPosY >= centerPos[1]) {
//right-bottom
path.moveTo(realPosX-5, realPosY+5);
path.lineTo(realPosX-15, realPosY+15);
path.lineTo(realPosX - 15, realPosY - 15);
rectF = new RectF(realPosX-200, realPosY-40, realPosX-15, realPosY + 30);
canvas.drawRoundRect(rectF, 15, 15, mPaint);
mPaint.reset();
mPaint.setColor(Color.RED);
mPaint.setTextSize(mXYTitleTextSize - 5);
canvas.drawText(“(”+mMeasureXpos+“, “+mMeasureYpos+”)”, realPosX-180, realPosY, mPaint);
}
else if (realPosX > centerPos[0] && realPosY < centerPos[1]) {
//right-top
path.moveTo(realPosX-5, realPosY+5);
path.lineTo(realPosX-15, realPosY+15);
path.lineTo(realPosX - 15, realPosY - 15);
rectF = new RectF(realPosX-200, realPosY - 20, realPosX-15, realPosY + 50);
canvas.drawRoundRect(rectF, 15, 15, mPaint);
mPaint.reset();
mPaint.setColor(Color.RED);
mPaint.setTextSize(mXYTitleTextSize - 5);
canvas.drawText(“(”+mMeasureXpos+“, “+mMeasureYpos+”)”, realPosX-180, realPosY+30, mPaint);
}
path.close();
mPaint.setColor(Color.WHITE);
mPaint.setStyle(Paint.Style.FILL_AND_STROKE);
canvas.drawPath(path, mPaint);
}
最后
本文在开源项目GitHub中已收录，里面包含不同方向的自学编程路线、面试题集合/面经、及系列技术文章等，资源持续更新中…
目前已经更新的部分资料，需要的自己取：
自我介绍一下，小编13年上海交大毕业，曾经在小公司待过，也去过华为、OPPO等大厂，18年进入阿里一直到现在。
深知大多数初中级安卓工程师，想要提升技能，往往是自己摸索成长，但自己不成体系的自学效果低效又漫长，而且极易碰到天花板技术停滞不前！
因此收集整理了一份《2024年最新Android移动开发全套学习资料》送给大家，初衷也很简单，就是希望能够帮助到想自学提升又不知道该从何学起的朋友，同时减轻大家的负担。
由于文件比较大，这里只是将部分目录截图出来，每个节点里面都包含大厂面经、学习笔记、源码讲义、实战项目、讲解视频
如果你觉得这些内容对你有帮助，可以添加下面V无偿领取！（备注Android）
长，但自己不成体系的自学效果低效又漫长，而且极易碰到天花板技术停滞不前！**
因此收集整理了一份《2024年最新Android移动开发全套学习资料》送给大家，初衷也很简单，就是希望能够帮助到想自学提升又不知道该从何学起的朋友，同时减轻大家的负担。
[外链图片转存中…(img-kYTwYWTm-1710963642440)]
[外链图片转存中…(img-JTT4F0kN-1710963642441)]
[外链图片转存中…(img-6urwChyk-1710963642441)]
[外链图片转存中…(img-TRoajnUN-1710963642442)]
由于文件比较大，这里只是将部分目录截图出来，每个节点里面都包含大厂面经、学习笔记、源码讲义、实战项目、讲解视频
如果你觉得这些内容对你有帮助，可以添加下面V无偿领取！（备注Android）
[外链图片转存中…(img-r3BDkoxn-1710963642442)]
旨在为数千万中国开发者提供一个无缝且高效的云端环境，以支持学习、使用和贡献开源项目。
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