Android Google Map V2：点击另一个标记时如何更改之前点击的标记图标 [英] Android Google Map V2: How to change previous clicked marker's icon when clicked on another marker

问题描述

更新：我已经通过添加previousMarker对象解决了性能问题。因此只有以前点击过的标记将被删除并替换为默认图标。然而，当我点击标记时信息窗口仍然不显示。

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我有地图视图并设置了一些标记在上面。我想要的是当我点击一个标记时，它将它的图标更改为不同的图标，而当我点击另一个标记时，上一个标记的图标应该更改为原始图标。

我所做的就是这样，但只要点击标记就可以更改标记图标。

  @Override 
 public boolean onMarkerClick（Marker marker）{//当点击或点击标记时调用。 
 
 LatLng markerPos = marker.getPosition（）; 
 String markerLocationName = marker.getTitle（）; 
 String markerSubCategoryName = marker.getSnippet（）; 
 
 marker.remove（）; 
 
 MarkerOptions markerOptions = 
新MarkerOptions（）。position（markerPos）
 .title（markerLocationName）
 .snippet（markerSubCategoryName）
 .icon（BitmapDescriptorFactory .fromResource（R.drawable.new_icon））; //更改标记图标
 mMap.addMarker（markerOptions）; 
 Log.d（marker，更改标记图标）; //可以在这里打开对话窗口
返回false; 
 
 $ / code> 

所以如果我点击2个标记，我会得到2个新图标，同时我想要的只是当前点击的标记更改其图标。

所以我也通过添加2行代码来完成这样的事情。

  @Override 
 public boolean onMarkerClick（标记标记）{//当点击或点击标记时调用。 
 
 mMap.clear（）; 
 populateAllMarkersOnMap（）; //在地图上重新生成标记
 
 LatLng markerPos = marker.getPosition（）; 
 String markerLocationName = marker.getTitle（）; 
 String markerSubCategoryName = marker.getSnippet（）; 
 
 marker.remove（）; //删除当前点击的标记
 
 MarkerOptions markerOptions = 
 new MarkerOptions（）。position（markerPos）
 .title（markerLocationName）
 .snippet（markerSubCategoryName）
 .icon（BitmapDescriptorFactory.fromResource（R.drawable.new_icon））; //更改标记图标
 mMap.addMarker（markerOptions）; //用新图标添加标记到地图
返回false; 
} 
  

缺点是1 /它禁用信息窗口也以第一种方式发生）。 2 /清除地图上的所有标记并再次设置所有标记。想象一下，我有100个标记，应该是每次点击时的性能问题？

populateAllMarkersOnMap（）现在可以像这样简单： p>

  private void populateAllMarkersOnMap（）{
 setMarker（latA1，lonA1，A1，A1.1）; 
 setMarker（latA2，lonA2，A2，A2.1）; 
 // ...（100次或通过循环填充）
}; 
  

那么有没有办法让我以前点击的标记将它的图标变回默认值新标记？为我的英语道歉，如果你认为我应该为我的问题换个标题，请帮助。

最简单的方法。我创建了一个previousMarker对象并存储了当前点击的标记：

  @Override 
 public boolean onMarkerClick（Marker marker）{ //当点击或点击标记时调用。 
 if（previousMarker！= null）{
 previousMarker.setIcon（BitmapDescriptorFactory.fromResource（R.drawable.dot_icon））; 
} 
 marker.setIcon（BitmapDescriptorFactory.fromResource（R.drawable.ct_icon））; 
 previousMarker = marker; //现在点击标记变成previousMarker 
 return false; 
} 
  

UPDATE: I have solved the performance issue by adding a previousMarker object. So only the previous clicked marker will be remove and replaced with the default icon. However the info window is still not shown when I click on the marker.

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I have a map view and set some markers on it. What I want is when I clicked on a marker, it changes its icon to be a different icon, and when I click on another marker, the previous marker's icon should change to its original one.

What I've done is something like this but it just simply changes the marker icon whenever I click on the marker.

@Override
public boolean onMarkerClick(Marker marker) { //Called when a marker has been clicked or tapped.

    LatLng markerPos=marker.getPosition();
    String markerLocationName=marker.getTitle();
    String markerSubCategoryName=marker.getSnippet();

    marker.remove();

    MarkerOptions markerOptions =
            new MarkerOptions().position(markerPos)
                    .title(markerLocationName)
                    .snippet(markerSubCategoryName)
                    .icon(BitmapDescriptorFactory.fromResource(R.drawable.new_icon));// Changing marker icon
    mMap.addMarker(markerOptions);
    Log.d("marker","change marker icon"); // can open a dialog window here
    return false;
}

So if I click 2 markers, I will get 2 new icons appears, meanwhile what I want is only the current clicked marker changes its icon.

So I've also done something like this by adding 2 more lines of code. It succeeds doing what I want but it has some drawback (see below).

@Override
public boolean onMarkerClick(Marker marker) { //Called when a marker has been clicked or tapped.

    mMap.clear();
    populateAllMarkersOnMap();//repopulate markers on map

    LatLng markerPos=marker.getPosition();
    String markerLocationName=marker.getTitle();
    String markerSubCategoryName=marker.getSnippet();

    marker.remove(); //remove the current clicked marker

    MarkerOptions markerOptions =
            new MarkerOptions().position(markerPos)
                    .title(markerLocationName)
                    .snippet(markerSubCategoryName)
                    .icon(BitmapDescriptorFactory.fromResource(R.drawable.new_icon));// Changing marker icon
    mMap.addMarker(markerOptions); //add marker with new icon into map
    return false;
}

The drawback is 1/ it "disable" the info window (the same thing also happen in the first way). 2/ it clear all the markers on map and set all the markers again. Imagine I have 100 markers, should that be a performance problem on every click I do?

The populateAllMarkersOnMap() can be something as simple like this at the moment:

private void populateAllMarkersOnMap(){
    setMarker(latA1, lonA1, "A1","A1.1"); 
    setMarker(latA2, lonA2, "A2","A2.1"); 
    // ... (100 times or populated via a loop) 
};

So is there a way to get previous clicked marker to change its icon back to default when I click a new marker? Apologise for my English, if you think I should put another title for my question, please help.

解决方案

Finally I found the best and most simple way. I made a previousMarker object and store the current clicked marker:

@Override
public boolean onMarkerClick(Marker marker) { //Called when a marker has been clicked or tapped.
    if(previousMarker!=null){
        previousMarker.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.dot_icon));
    }
    marker.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.ct_icon));
    previousMarker=marker; //Now the clicked marker becomes previousMarker
    return false;
}

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