如何在android中mapview的overlayitem上绘制唯一标签

Question

这是我正在努力实现的目标的屏幕截图

我想为地图的每个覆盖项添加唯一标签（如数字）。我已经完成了添加覆盖项并将它们显示在地图上的基本部分。但是这个我卡了很长时间

Answer 1

您可以使用函数在同一个ItemizedOverlay上添加带有不同标记的OverlayItem：

overlayItem.setMarker(drawable);

为此，您需要设置Drawable 的边界：

Drawable icon1 = getResources().getDrawable(R.drawable.icon1);
Drawable icon2 = getResources().getDrawable(R.drawable.icon2);
icon1.setBounds(0, 0, icon1.getIntrinsicWidth(), icon1.getIntrinsicHeight());
icon2.setBounds(0, 0, icon2.getIntrinsicWidth(), icon2.getIntrinsicHeight());
OverlayItem item1 = new OverlayItem(new Point(48858290, 2294450), 
    "Tour Eiffel", "La tour Eiffel");
OverlayItem item2 = new OverlayItem(new Point(48873830, 2294800), 
    "Arc de Triomphe", "L'arc de triomphe");                        
item1.setMarker(icon1);
item2.setMarker(icon2);

您需要的位图数量与您的最大标记数一样多。但它会比在位图上动态绘制文本更快。这是一部手机，处理器并不快。 如果你更喜欢在 Bitmap 上绘制文本，Ii 真的很简单，你可以这样做：

//get a reference on the ImageView 
ImageView iv = (ImageView)findViewById(R.id.myImage);

// load the marker image
Bitmap myRefBitmap = BitmapFactory.decodeResource(getResources(), 
    R.drawable.icon);

// create a mutable bitmap with the same size as the marker image
Bitmap myWrittenBitmap = Bitmap.createBitmap(myRefBitmap.getWidth(), 
    myRefBitmap.getHeight(), Bitmap.Config.ARGB_4444);

// create a Canvas on which to draw and a Paint to write text.
Canvas canvas = new Canvas(myWrittenBitmap);
Paint txtPaint = new Paint();
txtPaint.setColor(Color.RED);
txtPaint.setTextSize(12);
txtPaint.setFlags(Paint.ANTI_ALIAS_FLAG);
txtPaint.setTypeface(Typeface.DEFAULT_BOLD);

//draw ref bitmap then text on our canvas
canvas.drawBitmap(myRefBitmap, 0, 0, null);
canvas.drawText("Droid", 5, 15, txtPaint);

// set the new written bitmap into the ImageView
iv.setImageBitmap(myWrittenBitmap);