居中位图标记(Google Maps Android API v2)

当我从一个自定义的位图中添加一个标记时,标记不会在我指定的位置居中。

我像这样添加它:

// ID tramo final int tramoId = tr.getId(); // Nodos final Nodo[] nodos = tr.getNodos(); final PolylineOptions p = new PolylineOptions(); MarkerOptions m = new MarkerOptions(); // Seteamos posicion de linea y marker m.position(semisuma(nodos)); for (final Nodo n : nodos) { p.add(n.getLatLng()); } // Color de linea y marker BitmapDescriptor icon = null; if (tr.getCapacidad() == 0) { p.color(0xFF000000); m = null; } else if (tr.getCapacidad() - tr.getPlazasOcupadas() == 0) { p.color(0xEEFF0000); final TextDrawable drawable = new TextDrawable(0, 0xEEFF0000, 0xFFFFFFFF); icon = BitmapDescriptorFactory.fromBitmap(fromDrawable(drawable)); } else { p.color(0xEE00FFFF); final TextDrawable drawable = new TextDrawable(0, 0xEE00FFFF, 0xFFFFFFFF); icon = BitmapDescriptorFactory.fromBitmap(fromDrawable(drawable)); } if (m != null) { m.title(String.valueOf(tramoId)); m.icon(icon); } if (polylinesTramo.get(idTramo) != null) { polylinesTramo.get(idTramo).remove(); } if (markersTramo.get(idTramo) != null) { markersTramo.get(idTramo).remove(); } polylinesTramo.put(idTramo, map.getMap().addPolyline(p)); if (marker != null) { markersTramo.put(idTramo, map.getMap().addMarker(m)); } 

这是TextDrawable的代码:

 package com.cidaut.blueparking.ui; import android.graphics.Canvas; import android.graphics.ColorFilter; import android.graphics.Paint; import android.graphics.PixelFormat; import android.graphics.drawable.Drawable; public class TextDrawable extends Drawable { private final String text; private final Paint paint; private final int centroX = 13; private final int centroY = 16; private final float textSize; private final float whereToDrawX; private final int bgColor; public TextDrawable(final int text, final int bgColor, final int textColor) { this(String.valueOf(text), bgColor, textColor); } public TextDrawable(final String text, final int bgColor, final int textColor) { this.text = text; this.bgColor = bgColor; this.paint = new Paint(); paint.setColor(textColor); paint.setTextSize(14f); paint.setAntiAlias(true); paint.setFakeBoldText(true); paint.setStyle(Paint.Style.FILL); paint.setTextAlign(Paint.Align.LEFT); textSize = paint.measureText(text); whereToDrawX = centroX - (textSize / 2); } @Override public void draw(final Canvas canvas) { canvas.drawColor(bgColor); canvas.drawText(text, whereToDrawX, centroY, paint); } @Override public void setAlpha(final int alpha) { paint.setAlpha(alpha); } @Override public void setColorFilter(final ColorFilter cf) { paint.setColorFilter(cf); } @Override public int getOpacity() { return PixelFormat.TRANSLUCENT; } } 

这里是fromDrawable方法

 protected Bitmap fromDrawable(final Drawable drawable) { final Bitmap bitmap = Bitmap.createBitmap(25, 25, Config.ARGB_8888); final Canvas canvas = new Canvas(bitmap); drawable.setBounds(0, 0, canvas.getWidth(), canvas.getHeight()); drawable.draw(canvas); return bitmap; } 

我应该添加到我的代码,以获得在他们的立场中心的标记?

只需将标记的锚点设置为0.5和0.5(图标的中间)即可。

 ... MarkerOptions m = new MarkerOptions(); m.anchor(0.5f, 0.5f); ... 

默认的锚点值是(0.5f,1.0f)。 你可以在这里阅读关于标记 。

如果您使用标记 ,则需要重新指定锚以将图像居中。 正如文档所述:“锚点:图像上的点将放置在标记的LatLng位置,默认为图像左侧和图像底部的50%”。

如果你想让图像在默认情况下居中,你应该考虑使用GroundOverlay而不是Marker。 请参阅GroundOverlay ,“锚点默认为图像顶部50%,图像左侧50%”。