居中位图标记(Google Maps Android API v2) [英] Centering bitmap Marker (Google Maps Android API v2)

问题描述

当我从自定义位图添加标记时，该标记未居中于我指定的点.

When I add a marker from a custom Bitmap, the marker is not centered at the point I specify.

我要这样添加它:

    // 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:

This is the code of TextDrawable:

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;
}

我应该在代码中添加什么以使标记居中放置?

What should I add to my code to get the markers centered in their positions?

推荐答案

只需将标记的锚点设置为0.5和0.5(图标的中间)即可.

Simply set anchor point for you marker to 0.5 and 0.5 (middle of your icon).

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

默认锚点值为(0.5f，1.0f). 您可以在此处阅读有关标记的信息.

The default anchor value is (0.5f, 1.0f). You can read about marker here.

这篇关于居中位图标记(Google Maps Android API v2)的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！