前言
本篇主要给大家写一个展示公交线路的自定义view，直接上效果图。
效果图
看到上面的图是不是有些紧张？别慌，蛋定，蛋定！每个站都由几个部分组成：
绘制序列号背景圆圈绘制序列号绘制车站名称-
绘制上、转、下
按照上列绘制顺序，以序列号背景圆圈的中心点作为基点进行绘制。
接下来我们看一下具体实现。
立即体验
扫描以下二维码下载体验App(从0.2.3版本开始，体验App内嵌版本更新检测功能)：
JSCKit库传送门：https://github.com/JustinRoom/JSCKit
实现
- 创建一个普通的自定义
view。
我们给它命名为VerticalStepView，并创建两个画笔：
-
Paint paint----普通画笔。 -
TextPaint textPaint----文字画笔。
VerticalStepView.java
public class VerticalStepView extends View {
//普通画笔
private Paint paint = new Paint(Paint.ANTI_ALIAS_FLAG);
//文字画笔
private TextPaint textPaint = new TextPaint(Paint.ANTI_ALIAS_FLAG);
public VerticalStepView(Context context) {
this(context, null);
}
public VerticalStepView(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public VerticalStepView(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
}
}
- 创建数据模型
JavaBean。根据每个站的组成部分，我们不难定义出数据模型，我们给它命名RouteViewPoint。数据模型里的每个字段基本上都有注释，自行看注释理解。
RouteViewPoint.java
public class RouteViewPoint {
public static final int DEFAULT_TEXT_COLOR = 0xFF333333;
private int key;//标识键(这个属性相当于一张数据表的主键字段，辅助你完成一些其他的操作)
private int basicX;//基点(X轴方向坐标)
private int basicY;//基点(Y轴方向坐标)
//这是序列号的背景圆一些相关属性
private float radius = 10;//圆半径
private int borderColor = DEFAULT_TEXT_COLOR;//圆框颜色
private int borderWidth = 2;//圆框粗细
private int backgroundColor = Color.WHITE;//圆背景颜色
private int distance;//与前一个圆的距离
//序号
private String index;
private int indexColor = DEFAULT_TEXT_COLOR;
private float indexSize;
private boolean indexBold;
//公交
private String transit;
private int transitColor = DEFAULT_TEXT_COLOR;
private float transitSize;
private boolean transitBold;//是否加粗显示
//上、转、下
private String cursor;
private int cursorColor = DEFAULT_TEXT_COLOR;
private float cursorSize;
private boolean cursorBold;//是否加粗显示
//起点、站、终点
private String label;
private int labelColor = DEFAULT_TEXT_COLOR;
private float labelSize;
private boolean labelBold;//是否加粗显示
}
- 测量
VerticalStepView的宽高。我们要根据数据测量出View的宽高，否则即使绘制完毕也看不见效果。这里主要测量高度。
数据集：
private List<RouteViewPoint> points = new ArrayList<>();
高度 =getPaddingTop()+ 第一个圆的半径 + 所有圆之间的距离和 + 最后一个圆的半径 +getPaddingBottom()。
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int offsetY = getPaddingTop();
int startX = (int) (getPaddingLeft() + 10 + getMaxTransitWidth() + getMaxRadius() + 0.5f);
if (points.size() > 1) {
for (int i = 0; i < points.size(); i++) {
RouteViewPoint p = points.get(i);
if (i == 0)
offsetY += p.getRadius();
if (i > 0)
offsetY += p.getDistance();
p.setBasicX(startX);
p.setBasicY(offsetY);
if (i == points.size() - 1)
offsetY += p.getRadius();
}
} else if (points.size() == 1) {
RouteViewPoint p = points.get(0);
offsetY += p.getRadius();
p.setBasicY(offsetY);
offsetY += p.getRadius();
}
offsetY += getPaddingBottom();
heightMeasureSpec = MeasureSpec.makeMeasureSpec(offsetY, MeasureSpec.EXACTLY);
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
}
- 在
onDraw(Canvas canvas)方法中绘制数据。
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//画连接起所有圆的那条竖线：从第一个圆中心到最后一个圆的中心
if (points.size() > 1) {
paint.setStrokeWidth(lineWidth);
paint.setStyle(Paint.Style.STROKE);
paint.setColor(lineColor);
canvas.drawLine(
points.get(0).getBasicX(),
points.get(0).getBasicY(),
points.get(points.size() - 1).getBasicX(),
points.get(points.size() - 1).getBasicY(),
paint
);
}
//绘制所有数据
for (RouteViewPoint p : points) {
drawCircle(canvas, p, paint);
drawIndex(canvas, p, textPaint);
drawLabel(canvas, p, 10, textPaint);
drawTransit(canvas, p, 10, textPaint);
drawCursor(canvas, p, 4, textPaint);
}
}
- 绘制序列号背景圆圈：
/**
* 画圆
*
* @param canvas
* @param p
* @param paint
*/
private void drawCircle(Canvas canvas, RouteViewPoint p, Paint paint) {
if (p == null)
return;
paint.setColor(p.getBackgroundColor());
paint.setStyle(Paint.Style.FILL);
canvas.drawCircle(p.getBasicX(), p.getBasicY(), p.getRadius(), paint);
paint.setColor(p.getBorderColor());
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeWidth(p.getBorderWidth());
canvas.drawCircle(p.getBasicX(), p.getBasicY(), p.getRadius(), paint);
}
- 绘制序列号：
/**
* 画序号
*
* @param canvas
* @param p
* @param textPaint
*/
private void drawIndex(Canvas canvas, RouteViewPoint p, TextPaint textPaint) {
if (p == null)
return;
String index = p.getIndex();
if (index == null || index.length() == 0)
return;
textPaint.setColor(p.getIndexColor());
textPaint.setTextSize(p.getIndexSize());
textPaint.setTypeface(Typeface.defaultFromStyle(p.isIndexBold() ? Typeface.BOLD : Typeface.NORMAL));
textPaint.getTextBounds(index, 0, index.length(), textBoundRect);
Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();
int w = textBoundRect.right - textBoundRect.left;
int h = textBoundRect.bottom - textBoundRect.top;
float xStart = p.getBasicX() - w / 2.0f;
float baseLine = p.getBasicY() - h / 2.0f + (h - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top;
canvas.drawText(index, xStart, baseLine, textPaint);
}
- 绘制站点名称：
/**
* 画标签
*
* @param canvas
* @param p
* @param marginLeft
* 文字与圆左边的距离
* @param textPaint
*/
private void drawLabel(Canvas canvas, RouteViewPoint p, int marginLeft, TextPaint textPaint) {
if (p == null)
return;
String label = p.getLabel();
if (label == null || label.length() == 0)
return;
textPaint.setColor(p.getLabelColor());
textPaint.setTextSize(p.getLabelSize());
textPaint.setTypeface(Typeface.defaultFromStyle(p.isLabelBold() ? Typeface.BOLD : Typeface.NORMAL));
textPaint.getTextBounds(label, 0, label.length(), textBoundRect);
Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();
int w = textBoundRect.right - textBoundRect.left;
int h = textBoundRect.bottom - textBoundRect.top;
float xStart = p.getBasicX() + getMaxRadius() + marginLeft;
float baseLine = p.getBasicY() - h / 2.0f + (h - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top;
canvas.drawText(label, xStart, baseLine, textPaint);
}
- 绘制上、转、下：
/**
* 画上、转、下
*
* @param canvas
* @param p
* @param marginRight
* 文字与圆右边的距离
* @param textPaint
*/
private void drawTransit(Canvas canvas, RouteViewPoint p, int marginRight, TextPaint textPaint) {
if (p == null)
return;
String transit = p.getTransit();
if (transit == null || transit.length() == 0)
return;
textPaint.setColor(p.getTransitColor());
textPaint.setTextSize(p.getTransitSize());
textPaint.setTypeface(Typeface.defaultFromStyle(p.isTransitBold() ? Typeface.BOLD : Typeface.NORMAL));
textPaint.getTextBounds(transit, 0, transit.length(), textBoundRect);
Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();
int w = textBoundRect.right - textBoundRect.left;
int h = textBoundRect.bottom - textBoundRect.top;
float xStart = p.getBasicX() - w - p.getRadius() - marginRight;
float baseLine = p.getBasicY() - h / 2.0f + (h - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top;
canvas.drawText(transit, xStart, baseLine, textPaint);
}
- 绘制游标：
/**
* 画游标
*
* @param canvas
* @param p
* @param marginLeft
* 文字与圆右边的距离
* @param textPaint
*/
private void drawCursor(Canvas canvas, RouteViewPoint p, int marginLeft, TextPaint textPaint) {
if (p == null)
return;
String cursor = p.getCursor();
if (cursor == null || cursor.length() == 0)
return;
textPaint.setColor(p.getCursorColor());
textPaint.setTextSize(p.getCursorSize());
textPaint.setTypeface(Typeface.defaultFromStyle(p.isCursorBold() ? Typeface.BOLD : Typeface.NORMAL));
textPaint.getTextBounds(cursor, 0, cursor.length(), textBoundRect);
Paint.FontMetrics fontMetrics = textPaint.getFontMetrics();
int w = textBoundRect.right - textBoundRect.left;
int h = textBoundRect.bottom - textBoundRect.top;
float xStart = p.getBasicX() + getMaxRadius() + marginLeft;
float newBasicY = p.getBasicY() + p.getRadius() + h / 2.0f;
float baseLine = newBasicY - h / 2.0f + (h - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top;
// float xStart = p.getBasicX() + getMaxRadius() + marginLeft + 10 + rect.right - rect.left;
// float baseLine = p.getBasicY() - h / 2.0f + (h - fontMetrics.bottom + fontMetrics.top) / 2 - fontMetrics.top;
canvas.drawText(cursor, xStart, baseLine, textPaint);
}
自此，整个VeritcalStepView就完成了。
用法
这里使用百度地图API路线规划举个栗子：
/**
* 同城路线
*
* @param routeLine
* @return
*/
private List<RouteViewPoint> getSameCityPoints(MassTransitRouteLine routeLine) {
float txt10 = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 10, itemView.getResources().getDisplayMetrics());
List<RouteViewPoint> points = new ArrayList<>();
List<List<MassTransitRouteLine.TransitStep>> steps = routeLine.getNewSteps();
for (int i = 0; i < steps.size(); i++) {
List<MassTransitRouteLine.TransitStep> subSteps = steps.get(i);
MassTransitRouteLine.TransitStep transitStep = subSteps.get(0);
RouteViewPoint start = getBasePoint();
RouteViewPoint end = getBasePoint();
start.setIndex(String.valueOf(i + 1));
end.setIndex(String.valueOf(i + 2));
switch (transitStep.getVehileType()) {
case ESTEP_WALK:
start.setLabel("起点");
start.setLabelColor(0xFF999999);
RouteViewPoint center = getBasePoint();
center.setKey(100);
center.setRadius(10);
center.setLabelColor(0xFF999999);
center.setLabel(transitStep.getInstructions());
center.setLabelSize(txt10);
end.setLabel("终点");
end.setLabelColor(0xFF999999);
if (i == 0) {
points.add(start);
points.add(center);
} else if (i == steps.size() - 1) {
points.add(center);
points.add(end);
} else {
points.add(center);
}
break;
case ESTEP_TRAIN:
case ESTEP_DRIVING:
case ESTEP_COACH:
case ESTEP_PLANE:
case ESTEP_BUS:
BusInfo busInfo = transitStep.getBusInfo();
start.setKey(-1);
start.setCursor(getBuses(subSteps));
start.setLabel(getStationName(busInfo.getDepartureStation()));
points.add(start);
int stopNum = busInfo.getStopNum() - 1;
if (stopNum < 0)
stopNum = 0;
for (int j = 0; j < stopNum; j++) {
RouteViewPoint stopPoint = getBasePoint();
stopPoint.setKey(101);
stopPoint.setRadius(10);
stopPoint.setBackgroundColor(0xFF00BA86);
stopPoint.setBorderColor(0xFF00BA86);
stopPoint.setLabelColor(0xFF999999);
stopPoint.setLabel("•••");
stopPoint.setLabelSize(txt10);
points.add(stopPoint);
}
end.setKey(1);
end.setLabel(getStationName(busInfo.getArriveStation()));
points.add(end);
break;
}
}
for (int i = 0; i < points.size(); i++) {
if (i > 0) {
RouteViewPoint p = points.get(i);
RouteViewPoint pre = points.get(i - 1);
switch (p.getKey()) {
case 101:
p.setDistance(pre.getKey() == 101 ? 30 : 80);
break;
case 100:
if (pre.getKey() < 100)
p.setDistance(80);
break;
default:
if (pre.getKey() == 101 ||
pre.getKey() == 100)
p.setDistance(80);
break;
}
}
}
return points;
}
/**
* 跨城路线
* @param routeLine
* @return
*/
private List<RouteViewPoint> getDifferentCityPoints(MassTransitRouteLine routeLine) {
float txt10 = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 10, itemView.getResources().getDisplayMetrics());
List<RouteViewPoint> points = new ArrayList<>();
List<List<MassTransitRouteLine.TransitStep>> steps = routeLine.getNewSteps();
for (int i = 0; i < steps.size(); i++) {
List<MassTransitRouteLine.TransitStep> subSteps = steps.get(i);
for (int j = 0; j < subSteps.size(); j++) {
MassTransitRouteLine.TransitStep transitStep = subSteps.get(j);
RouteViewPoint start = getBasePoint();
RouteViewPoint end = getBasePoint();
start.setIndex(String.valueOf(i + 1));
end.setIndex(String.valueOf(i + 2));
switch (transitStep.getVehileType()) {
case ESTEP_WALK:
start.setLabel("起点");
start.setLabelColor(0xFF999999);
RouteViewPoint center = getBasePoint();
center.setKey(100);
center.setRadius(10);
center.setLabelColor(0xFF999999);
center.setLabel(transitStep.getInstructions());
center.setLabelSize(txt10);
end.setLabel("终点");
end.setLabelColor(0xFF999999);
if (i == 0) {
points.add(start);
points.add(center);
} else if (i == steps.size() - 1) {
points.add(center);
points.add(end);
} else {
points.add(center);
}
break;
case ESTEP_TRAIN:
case ESTEP_DRIVING:
case ESTEP_COACH:
case ESTEP_PLANE:
case ESTEP_BUS:
BusInfo busInfo = transitStep.getBusInfo();
start.setKey(-1);
start.setCursor(getBuses(subSteps));
start.setLabel(getStationName(busInfo.getDepartureStation()));
points.add(start);
int stopNum = busInfo.getStopNum() - 1;
if (stopNum < 0)
stopNum = 0;
for (int k = 0; k < stopNum; k++) {
RouteViewPoint stopPoint = getBasePoint();
stopPoint.setKey(101);
stopPoint.setRadius(10);
stopPoint.setBackgroundColor(0xFF00BA86);
stopPoint.setBorderColor(0xFF00BA86);
stopPoint.setLabelColor(0xFF999999);
stopPoint.setLabel("•••");
stopPoint.setLabelSize(txt10);
points.add(stopPoint);
}
end.setKey(1);
end.setLabel(getStationName(busInfo.getArriveStation()));
points.add(end);
break;
}
}
}
for (int i = 0; i < points.size(); i++) {
if (i > 0) {
RouteViewPoint p = points.get(i);
RouteViewPoint pre = points.get(i - 1);
switch (p.getKey()) {
case 101:
p.setDistance(pre.getKey() == 101 ? 30 : 80);
break;
case 100:
if (pre.getKey() < 100)
p.setDistance(80);
break;
default:
if (pre.getKey() == 101 ||
pre.getKey() == 100)
p.setDistance(80);
break;
}
}
}
return points;
}
private RouteViewPoint getBasePoint() {
float textSize10 = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 10, itemView.getResources().getDisplayMetrics());
float textSize12 = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_SP, 12, itemView.getResources().getDisplayMetrics());
RouteViewPoint p = new RouteViewPoint();
p.setDistance(120);
p.setRadius(20);
p.setBackgroundColor(0xFFCCCCCC);
p.setBorderColor(0xFFCCCCCC);
p.setIndexSize(textSize10);
p.setCursorSize(textSize12);
p.setCursorColor(0xFFFF00FF);
p.setTransitSize(textSize12);
p.setTransitColor(0xFF999999);
p.setLabelSize(textSize12);
return p;
}
private String getBuses(List<MassTransitRouteLine.TransitStep> subSteps) {
if (subSteps == null || subSteps.isEmpty())
return "";
StringBuilder builder = new StringBuilder();
builder.append("乘坐|▷ ");
for (int i = 0; i < subSteps.size(); i++) {
BusInfo busInfo = subSteps.get(i).getBusInfo();
builder.append(busInfo.getName().replace("路", ""));
if (i < subSteps.size() - 1)
builder.append(" • ");
}
return builder.toString();
}
private String getStationName(String station) {
if (station == null || station.length() == 0)
return "";
if (station.endsWith("站站"))
return station.substring(0, station.length() - 1);
else
return station;
}
MassTransitRouteLine这个是百度地图API里的跨城路线规划的JavaBean。
结尾
本人纯属Android菜鸟，欢迎各路大神指点！路过的童鞋，要是觉得还不错的，动动你金贵的小手指加个关注，后期我会把觉得对你们有所小帮助的Android技术写成文章共享给大家，谢谢！QQ：1006368252。
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