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如何在android中的mapview的overlayitem上绘制独特的标签

发布于 2024-10-21 00:30:47 字数 163 浏览 10 评论 0原文

这是我试图实现的屏幕截图

在此处输入图像描述

我想添加独特的标签（例如数字）到地图的每个覆盖项目。我已经完成了添加覆盖项目并将其显示在地图上的基本部分。但这是我被困了很长时间的地方

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病毒体 2024-10-28 00:30:47

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

overlayItem.setMarker(drawable);

为此，您需要在 Drawable 上设置边界：

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);

您将需要与最大标记数一样多的位图。但它比在位图上动态绘制文本要快。这是一部手机，处理器速度并不快。
如果您无论如何都喜欢在位图上绘制文本，那么非常简单，您可以这样做：

//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);

You can add OverlayItem with different markers on the same ItemizedOverlay by using function:

overlayItem.setMarker(drawable);

For this to work, you need to set the bounds on the Drawable:

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);

You will need as much Bitmaps as your max number of markers. But it will be faster than dynamically draw text on bitmaps. It's a mobile phone, processors are not fast.
If you prefer to draw text on a Bitmap anyway, Ii's really easy, you can do it like this:

//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);

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