我尝试在地图上设置动态自定义标记,但它无效,而是显示默认标记。我在哪里错了?
IconFactory iconFactory = IconFactory.getInstance(MainActivity.this);
TextDrawable iconDrawable = new TextDrawable("CD");
Icon icon = iconFactory.fromDrawable(iconDrawable);
MarkerOptions marker = new MarkerOptions()
.position(new LatLng(location.latitude, location.longitude))
.icon(icon)
mapboxMap.addMarker(marker);
TextDrawable:
public class TextDrawable extends Drawable {
private final String text;
private final Paint paint;
public TextDrawable(String text) {
this.text = text;
this.paint = new Paint();
paint.setColor(Color.WHITE);
paint.setTextSize(22f);
paint.setAntiAlias(true);
paint.setFakeBoldText(true);
paint.setStrokeWidth(2);
paint.setStyle(Paint.Style.FILL);
paint.setTextAlign(Paint.Align.LEFT);
}
@Override
public void draw(Canvas canvas) {
canvas.drawText(text, 0, 0, paint);
}
@Override
public void setAlpha(int alpha) {
paint.setAlpha(alpha);
}
@Override
public void setColorFilter(ColorFilter cf) {
paint.setColorFilter(cf);
}
@Override
public int getOpacity() {
return PixelFormat.TRANSLUCENT;
}
}
答案 0 :(得分:1)
使用此代码:
Marker myLocMarker = map.addMarker(new MarkerOptions()
.position(myLocation)
.icon(BitmapDescriptorFactory.fromBitmap(writeTextOnDrawable(R.drawable.bluebox, "your text goes here"))));
蓝框只是一个矩形资源,我们将用作背景
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) ;
}