首先介紹一個類：GraphicsOverlay

這是一個在地圖上繪制圖形的overlay。GraphicsOverlay通過調用setData(Graphic g) 完成圖形繪制。

Graphic 通過構造方法Graphic(Geometry g, Symbol s) 獲得。Geometry 是幾何圖形，而Symbol是幾何圖形的樣式，

設置線的樣式：setLineSymbol(Symbol.Color color, int width)

設置點的樣式：setPointSymbol(Symbol.Color color)

設置面的樣式：setSurface(Symbol.Color color, int status, int linewidth)

Geometry 就是一個幾何圖形，

繪制圓：setCircle(GeoPoint geoPoint, int radius)

繪制矩形：setEnvelope(GeoPoint geoPoint1, GeoPoint geoPoint2)

繪制點：setPoint(GeoPoint geoPoint, int pixel)

繪制多邊形：setPolygon(GeoPoint[] geoPoints)

繪制線：setPolyLine(GeoPoint[] geoPoints)

2.1.2還新增了Textoverlay，可以在地圖上添加文字。

TextOverlay textOverlay = new TextOverlay(mMapView);

mMapView.getOverlays().add(textOverlay);

textOverlay.addText(drawText()); //drawText()返回的是TextItem 類

具體來看看代碼怎么寫：

繪制線：

/**

* 繪制折線，該折線狀態隨地圖狀態變化

* @return 折線對象

*/

public Graphic drawLine(){

double mLat = 39.97923;

double mLon = 116.357428;

int lat = (int) (mLat*1E6);

int lon = (int) (mLon*1E6);

GeoPoint pt1 = new GeoPoint(lat, lon);

mLat = 39.94923;

mLon = 116.397428;

lat = (int) (mLat*1E6);

lon = (int) (mLon*1E6);

GeoPoint pt2 = new GeoPoint(lat, lon);

mLat = 39.97923;

mLon = 116.437428;

lat = (int) (mLat*1E6);

lon = (int) (mLon*1E6);

GeoPoint pt3 = new GeoPoint(lat, lon);

//構建線

Geometry lineGeometry = new Geometry();

//設定折線點坐標

GeoPoint[] linePoints = new GeoPoint[3];

linePoints[0] = pt1;

linePoints[1] = pt2;

linePoints[2] = pt3;

lineGeometry.setPolyLine(linePoints);

//設定樣式

Symbol lineSymbol = new Symbol();

Symbol.Color lineColor = lineSymbol.new Color();

lineColor.red = 255;

lineColor.green = 0;

lineColor.blue = 0;

lineColor.alpha = 255;

lineSymbol.setLineSymbol(lineColor, 10);

//生成Graphic對象

Graphic lineGraphic = new Graphic(lineGeometry, lineSymbol);

return lineGraphic;

}

繪制多邊形：

/**

* 繪制多邊形，該多邊形隨地圖狀態變化

* @return 多邊形對象

*/

public Graphic drawPolygon(){

double mLat = 39.93923;

double mLon = 116.357428;

int lat = (int) (mLat*1E6);

int lon = (int) (mLon*1E6);

GeoPoint pt1 = new GeoPoint(lat, lon);

mLat = 39.91923;

mLon = 116.327428;

lat = (int) (mLat*1E6);

lon = (int) (mLon*1E6);

GeoPoint pt2 = new GeoPoint(lat, lon);

mLat = 39.89923;

mLon = 116.347428;

lat = (int) (mLat*1E6);

lon = (int) (mLon*1E6);

GeoPoint pt3 = new GeoPoint(lat, lon);

mLat = 39.89923;

mLon = 116.367428;

lat = (int) (mLat*1E6);

lon = (int) (mLon*1E6);

GeoPoint pt4 = new GeoPoint(lat, lon);

mLat = 39.91923;

mLon = 116.387428;

lat = (int) (mLat*1E6);

lon = (int) (mLon*1E6);

GeoPoint pt5 = new GeoPoint(lat, lon);

//構建多邊形

Geometry polygonGeometry = new Geometry();

//設置多邊形坐標

GeoPoint[] polygonPoints = new GeoPoint[5];

polygonPoints[0] = pt1;

polygonPoints[1] = pt2;

polygonPoints[2] = pt3;

polygonPoints[3] = pt4;

polygonPoints[4] = pt5;

polygonGeometry.setPolygon(polygonPoints);

//設置多邊形樣式

Symbol polygonSymbol = new Symbol();

Symbol.Color polygonColor = polygonSymbol.new Color();

polygonColor.red = 0;

polygonColor.green = 0;

polygonColor.blue = 255;

polygonColor.alpha = 126;

polygonSymbol.setSurface(polygonColor,1,5);

//生成Graphic對象

Graphic polygonGraphic = new Graphic(polygonGeometry, polygonSymbol);

return polygonGraphic;

}

繪制點：

/**

* 繪制單點，該點狀態不隨地圖狀態變化而變化

* @return 點對象

*/

public Graphic drawPoint(){

double mLat = 39.98923;

double mLon = 116.397428;

int lat = (int) (mLat*1E6);

int lon = (int) (mLon*1E6);

GeoPoint pt1 = new GeoPoint(lat, lon);

//構建點

Geometry pointGeometry = new Geometry();

//設置坐標

pointGeometry.setPoint(pt1, 10);

//設定樣式

Symbol pointSymbol = new Symbol();

Symbol.Color pointColor = pointSymbol.new Color();

pointColor.red = 0;

pointColor.green = 126;

pointColor.blue = 255;

pointColor.alpha = 255;

pointSymbol.setPointSymbol(pointColor);

//生成Graphic對象

Graphic pointGraphic = new Graphic(pointGeometry, pointSymbol);

return pointGraphic;

}繪制圓：

/**

* 繪制圓，該圓隨地圖狀態變化

* @return 圓對象

*/

public Graphic drawCircle() {

double mLat = 39.90923;

double mLon = 116.447428;

int lat = (int) (mLat*1E6);

int lon = (int) (mLon*1E6);

GeoPoint pt1 = new GeoPoint(lat, lon);

//構建圓

Geometry circleGeometry = new Geometry();

//設置圓中心點坐標和半徑

circleGeometry.setCircle(pt1, 2500);

//設置樣式

Symbol circleSymbol = new Symbol();

Symbol.Color circleColor = circleSymbol.new Color();

circleColor.red = 0;

circleColor.green = 255;

circleColor.blue = 0;

circleColor.alpha = 126;

circleSymbol.setSurface(circleColor,1,3);

//生成Graphic對象

Graphic circleGraphic = new Graphic(circleGeometry, circleSymbol);

return circleGraphic;

}繪制文字

/**

* 繪制文字，該文字隨地圖變化有透視效果

* @return 文字對象

*/

public TextItem drawText(){

double mLat = 39.86923;

double mLon = 116.397428;

int lat = (int) (mLat*1E6);

int lon = (int) (mLon*1E6);

//構建文字

TextItem item = new TextItem();

//設置文字位置

item.pt = new GeoPoint(lat,lon);

//設置文件內容

item.text = "百度地圖SDK";

//設文字大小

item.fontSize = 40;

Symbol symbol = new Symbol();

Symbol.Color bgColor = symbol.new Color();

//設置文字背景色

bgColor.red = 0;

bgColor.blue = 0;

bgColor.green = 255;

bgColor.alpha = 50;

Symbol.Color fontColor = symbol.new Color();

//設置文字著色

fontColor.alpha = 255;

fontColor.red = 0;

fontColor.green = 0;

fontColor.blue = 255;

//設置對齊方式

item.align = TextItem.ALIGN_CENTER;

//設置文字顏色和背景顏色

item.fontColor = fontColor;

item.bgColor = bgColor ;

return item;

}添加到圖層，顯示在地圖上：

GraphicsOverlay graphicsOverlay = new GraphicsOverlay(mMapView);

mMapView.getOverlays().add(graphicsOverlay);

//添加點

graphicsOverlay.setData(drawPoint());

//添加折線

graphicsOverlay.setData(drawLine());

//添加多邊形

graphicsOverlay.setData(drawPolygon());

//添加圓

graphicsOverlay.setData(drawCircle());

//繪制文字

TextOverlay textOverlay = new TextOverlay(mMapView);

mMapView.getOverlays().add(textOverlay);

textOverlay.addText(drawText());

//執行地圖刷新使生效

mMapView.refresh();

清除所有圖層：

mMapView.getOverlays().clear();

總結

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