如何在Google地图上的标记上方添加文字？

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 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()); } } 

我制作了一个Android应用程序，并将Google地图集成到了它。 我还在我所在城市周围的地方添加了标记。 我的问题是，我不知道如何在这些标记之上添加文本。 有人可以帮帮我吗？

Answer 1

 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 mOverlays = new ArrayList(); private static final int FONT_SIZE = 12; private static final int TITLE_MARGIN = 3; }