具有自定义标记的android Maps API v2

Question

我想用自定义标记制作地图。在API v2中，我可以为标记设置图标，标题等。但是我想在第一次发病时用标记显示标题。现在，仅当我点击标记时才显示标题。在v1中有叠加层，但是在v2中我没有发现任何类似的东西。编辑： 也许我不够清楚。Marker.showInfoWindow()API中的某些功能仅适用于一个标记。我无法同时显示所有标记的信息窗口。无论如何，我需要显示所有标记的标题，而无需等待用户点击它。

Answer 1

终于做到了。因此，您要做的是有一个背景图像（在我的情况下，我仅使用一个蓝色矩形）。像这样创建一个标记：

Marker myLocMarker = map.addMarker(new MarkerOptions()

            .position(myLocation)

            .icon(BitmapDescriptorFactory.fromBitmap(writeTextOnDrawable(R.drawable.bluebox, "your text goes here"))));

请注意writeTextOnDrawable（）方法：

private Bitmap writeTextOnDrawable(int drawableId, String text) {

    Bitmap bm = BitmapFactory.decodeResource(getResources(), drawableId)

            .copy(Bitmap.Config.ARGB_8888, true);

    Typeface tf = Typeface.create("Helvetica", Typeface.BOLD);

    Paint paint = new Paint();

    paint.setStyle(Style.FILL);

    paint.setColor(Color.WHITE);

    paint.setTypeface(tf);

    paint.setTextAlign(Align.CENTER);

    paint.setTextSize(convertToPixels(context, 11));

    Rect textRect = new Rect();

    paint.getTextBounds(text, 0, text.length(), textRect);

    Canvas canvas = new Canvas(bm);

    //If the text is bigger than the canvas , reduce the font size

    if(textRect.width() >= (canvas.getWidth() - 4))     //the padding on either sides is considered as 4, so as to appropriately fit in the text

        paint.setTextSize(convertToPixels(context, 7));        //Scaling needs to be used for different dpi's

    //Calculate the positions

    int xPos = (canvas.getWidth() / 2) - 2;     //-2 is for regulating the x position offset

    //"- ((paint.descent() + paint.ascent()) / 2)" is the distance from the baseline to the center.

    int yPos = (int) ((canvas.getHeight() / 2) - ((paint.descent() + paint.ascent()) / 2)) ;  

    canvas.drawText(text, xPos, yPos, paint);

    return  bm;

}

public static int convertToPixels(Context context, int nDP)

{

    final float conversionScale = context.getResources().getDisplayMetrics().density;

    return (int) ((nDP * conversionScale) + 0.5f) ;

}