如何添加上述谷歌地图标记的文字? [英] How to add text above a marker on Google Maps?
本文介绍了如何添加上述谷歌地图标记的文字?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
尝试
{
JSONArray jArray =新JSONArray(结果);
的for(int i = 0; I< jArray.length();我++)
{
的JSONObject json_data = jArray.getJSONObject(ⅰ);
//从数据库中检索数据。纬度和放大器;长=双/名称=字符串
latMarker = json_data.getDouble(纬);
lonMarker = json_data.getDouble(经度);
nameMarker = json_data.getString(姓名);
名单<覆盖> mapOverlays =调用MapView.getOverlays();
可绘制绘制= this.getResources()getDrawable(R.drawable.ic_launcher)。
CustomItemizedOverlay itemizedOverlay =
新CustomItemizedOverlay(绘制,这一点);
标记=新的GeoPoint(
(INT)(latMarker * 1E6)
(中间体)(lonMarker * 1E6));
//偏偏标记被点击时
OverlayItem overlayitem =新OverlayItem(标记,抽头,姓名:+ nameMarker);
itemizedOverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedOverlay);
}
}
赶上(JSONException E)
{
Log.e(log_tag+ e.toString()错误分析数据。);
}
}
我做了一个Android应用程序,并集成谷歌地图吧。我还添加了标记上的位置在我的城市的地方。而我的问题是,我不知道如何添加上面这些标记文本。谁能帮帮我,好吗?
解决方案
包com.labs;
进口的java.util.ArrayList;
进口android.graphics.Paint;
进口android.graphics.Point;
进口android.graphics.Rect;
进口android.graphics.RectF;
进口android.graphics.drawable.BitmapDrawable;
进口android.graphics.drawable.Drawable;
进口android.text.TextPaint;
进口com.google.android.maps.GeoPoint;
进口com.google.android.maps.ItemizedOverlay;
进口com.google.android.maps.MapView;
进口com.google.android.maps.OverlayItem;
公共类ResoucesOverlay扩展ItemizedOverlay
{
公共ResoucesOverlay(可绘制defaultMarker)
{
/ *对defaultMarker调用boundCenterBottom(),使标记图像连接
在其底部中心,以这种覆盖物品的纬度和经度* /
超(boundCenterBottom(defaultMarker));
markerHeight =((BitmapDrawable)defaultMarker).getBitmap()的getHeight()。
/ *这个调用来填充是非常重要的。尽管这不会出现在图形页面教程
*谷歌Android开发者网站,的MapView有时崩溃没有这个电话。
* /
填充();
}
@覆盖
保护OverlayItem createItem中(int i)以
{
返回mOverlays.get(ⅰ);
}
@覆盖
公众诠释大小()
{
返回mOverlays.size();
}
@覆盖
公共无效画(android.graphics.Canvas帆布,图形页面图形页面,
布尔影子)
{
super.draw(帆布,图形页面,阴影);
//通过所有OverlayItems并绘制标题为他们每个人
对于(OverlayItem项目:mOverlays)
{
/ *将转换纬度和放大器;该项目覆盖的经度坐标在屏幕上。
*由于我们称之为boundCenterBottom()的构造函数,所以这些坐标
*将显示标记的底部中心位置。
* /
的GeoPoint点= item.getPoint();
点markerBottomCenterCoords =新的点();
MapView.getProjection()在toPixels(点,markerBottomCenterCoords)。
/ *查找标题的宽度和高度* /
TextPaint paintText =新TextPaint();
油漆paintRect =新的油漆();
矩形RECT =新的矩形();
paintText.setTextSize(FONT_SIZE);
paintText.getTextBounds(item.getTitle(),0,item.getTitle()长度(),正确。);
rect.inset(-TITLE_MARGIN,-TITLE_MARGIN);
rect.offsetTo(markerBottomCenterCoords.x - rect.width()/ 2,markerBottomCenterCoords.y - markerHeight - rect.height());
paintText.setTextAlign(Paint.Align.CENTER);
paintText.setTextSize(FONT_SIZE);
paintText.setARGB(255,255,255,255);
paintRect.setARGB(130,0,0,0);
canvas.drawRoundRect(新RectF(矩形),2,2,paintRect);
canvas.drawText(item.getTitle(),rect.left + rect.width()/ 2,
rect.bottom - TITLE_MARGIN,paintText);
}
}
公共无效addOverlay(INT纬度,经度INT,字符串称号,
字符串片段)
{
OverlayItem项目;
GeoPoint对象的GeoPoint =新的GeoPoint(纬度,经度);
项目=新OverlayItem(GeoPoint对象,标题段);
mOverlays.add(项目);
填充();
}
公共无效addOverlay(OverlayItem overlayItem)
{
mOverlays.add(overlayItem);
填充();
}
私人诠释markerHeight;
私人的ArrayList< OverlayItem> mOverlays =新的ArrayList< OverlayItem>();
私有静态最终诠释FONT_SIZE = 12;
私有静态最终诠释TITLE_MARGIN = 3;
}
try
{
JSONArray jArray = new JSONArray(result);
for(int i=0;i<jArray.length();i++)
{
JSONObject json_data = jArray.getJSONObject(i);
//Retrieve data from db. lat & long = double / name = String
latMarker = json_data.getDouble("latitude");
lonMarker = json_data.getDouble("longitude");
nameMarker = json_data.getString("name");
List<Overlay> mapOverlays = mapView.getOverlays();
Drawable drawable = this.getResources().getDrawable(R.drawable.ic_launcher);
CustomItemizedOverlay itemizedOverlay =
new CustomItemizedOverlay(drawable, this);
markers = new GeoPoint (
(int) (latMarker * 1E6),
(int) (lonMarker * 1E6));
//Happens when a marker is clicked
OverlayItem overlayitem = new OverlayItem(markers, "Tapped", "Name: " + nameMarker);
itemizedOverlay.addOverlay(overlayitem);
mapOverlays.add(itemizedOverlay);
}
}
catch(JSONException e)
{
Log.e("log_tag", "Error parsing data. " + e.toString());
}
}
I made an android application and integrated Google Maps to it. I also added markers on places that are located around my city. And my problem is, I dont know how to add text above these markers. Can anyone help me, please?
解决方案
package com.labs;
import java.util.ArrayList;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.Drawable;
import android.text.TextPaint;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.ItemizedOverlay;
import com.google.android.maps.MapView;
import com.google.android.maps.OverlayItem;
public class ResoucesOverlay extends ItemizedOverlay
{
public ResoucesOverlay(Drawable defaultMarker)
{
/*Calling boundCenterBottom() on defaultMarker makes the marker image connect
at its Bottom center to the latitude and longitude of this Overlay Item*/
super(boundCenterBottom(defaultMarker));
markerHeight = ((BitmapDrawable) defaultMarker).getBitmap().getHeight();
/* This call to populate is important. Although this does not appear in the MapView tutorial
* on Google's Android developer site, the mapview some times crashes without this call.
*/
populate();
}
@Override
protected OverlayItem createItem(int i)
{
return mOverlays.get(i);
}
@Override
public int size()
{
return mOverlays.size();
}
@Override
public void draw(android.graphics.Canvas canvas, MapView mapView,
boolean shadow)
{
super.draw(canvas, mapView, shadow);
// go through all OverlayItems and draw title for each of them
for (OverlayItem item:mOverlays)
{
/* Converts latitude & longitude of this overlay item to coordinates on screen.
* As we have called boundCenterBottom() in constructor, so these coordinates
* will be of the bottom center position of the displayed marker.
*/
GeoPoint point = item.getPoint();
Point markerBottomCenterCoords = new Point();
mapView.getProjection().toPixels(point, markerBottomCenterCoords);
/* Find the width and height of the title*/
TextPaint paintText = new TextPaint();
Paint paintRect = new Paint();
Rect rect = new Rect();
paintText.setTextSize(FONT_SIZE);
paintText.getTextBounds(item.getTitle(), 0, item.getTitle().length(), rect);
rect.inset(-TITLE_MARGIN, -TITLE_MARGIN);
rect.offsetTo(markerBottomCenterCoords.x - rect.width()/2, markerBottomCenterCoords.y - markerHeight - rect.height());
paintText.setTextAlign(Paint.Align.CENTER);
paintText.setTextSize(FONT_SIZE);
paintText.setARGB(255, 255, 255, 255);
paintRect.setARGB(130, 0, 0, 0);
canvas.drawRoundRect( new RectF(rect), 2, 2, paintRect);
canvas.drawText(item.getTitle(), rect.left + rect.width() / 2,
rect.bottom - TITLE_MARGIN, paintText);
}
}
public void addOverlay(int latitude, int longitude, String title,
String snippet)
{
OverlayItem item;
GeoPoint geopoint = new GeoPoint(latitude, longitude);
item = new OverlayItem(geopoint, title, snippet);
mOverlays.add(item);
populate();
}
public void addOverlay(OverlayItem overlayItem)
{
mOverlays.add(overlayItem);
populate();
}
private int markerHeight;
private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
private static final int FONT_SIZE = 12;
private static final int TITLE_MARGIN = 3;
}
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