mylocationoverlay 第一次找到位置时消失

发布于 2024-12-10 20:22:56 字数 665 浏览 0 评论 0原文

我正在尝试设置 mylocationoverlay。不幸的是，它的行为很奇怪。它工作正常，但直到我离开 MapActivity 并返回到我的应用程序中后它才会出现。最初，地图会出现，当它获得良好位置时，会出现一个蓝色圆圈。然而，圆圈并没有分解成一个点，而是消失了。

我的代码如下所示：

onResume() {
    myLocation = new MyLocationOverlay(getActivity(), mp);
myLocation.enableMyLocation();
myLocation.runOnFirstFix(new Runnable(){
       public void run() {
          map.getOverlays().clear();
      map.getOverlays().add(myLocation);
      map.postInvalidate();
       }
    }
}


onPause() {
  myLocation.disableMyLocation();
  layout.removeView(map);
  map = null;

}

有谁对这里可能发生的事情有任何想法吗？由于这几乎是所有在线示例的逐字样，我可能会补充一点，我正在运行 2.3.4 的 motorolla atrix 上测试它。

原文

I am trying to setup a mylocationoverlay. Unfortunately, it is acting quite strangely. It works fine, except it does not appear until after I leave the MapActivity and come back in my application. Initially the map appears and there is a blue circle while it is getting a fine location. However, instead of resolving to a point, the circle just disappears.

My Code looks like this:

onResume() {
    myLocation = new MyLocationOverlay(getActivity(), mp);
myLocation.enableMyLocation();
myLocation.runOnFirstFix(new Runnable(){
       public void run() {
          map.getOverlays().clear();
      map.getOverlays().add(myLocation);
      map.postInvalidate();
       }
    }
}


onPause() {
  myLocation.disableMyLocation();
  layout.removeView(map);
  map = null;

}

Does anyone have any thoughts on what might be happening here? Since this is pretty much verbatim what all the examples online look like, I might add that I am testing this on a motorolla atrix running 2.3.4.

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浴红衣 2024-12-17 20:22:56

编辑：让我带您浏览一下您的代码：

onResume() {
// First time: draw a circle somewhere here. There is no GPS fix yet, so no dot. 
// Second time: The dot from the previous fix exists, so you get a circle and dot.
myLocation = new MyLocationOverlay(getActivity(), mp);
myLocation.enableMyLocation();
myLocation.runOnFirstFix(new Runnable(){
       public void run() {
       // First time: removes the circle and draws a dot.
       // Second time: removes the circle and dot, and draw a new dot. 
       map.getOverlays().clear();
       map.getOverlays().add(myLocation);
       map.postInvalidate();
       }
    }
}

圆圈

map.getOverlays().clear();使用remove()删除删除您不需要的覆盖层，而不是全部清除。

每当需要强制重绘时，请记住调用 map.invalidate();

Edit : Let me take you through your code:

onResume() {
// First time: draw a circle somewhere here. There is no GPS fix yet, so no dot. 
// Second time: The dot from the previous fix exists, so you get a circle and dot.
myLocation = new MyLocationOverlay(getActivity(), mp);
myLocation.enableMyLocation();
myLocation.runOnFirstFix(new Runnable(){
       public void run() {
       // First time: removes the circle and draws a dot.
       // Second time: removes the circle and dot, and draw a new dot. 
       map.getOverlays().clear();
       map.getOverlays().add(myLocation);
       map.postInvalidate();
       }
    }
}

map.getOverlays().clear(); removes the circle

use remove() instead to remove the overlay(s) that you don't want, instead of clearing them all.

Remember to call map.invalidate(); whenever you need to force a redraw

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