How to change the marker for the overlay on tap for android?

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北海茫月
北海茫月 2021-02-07 20:06

i have made an application in which i need to change the drawable of an overlayitem when a user clicks on it. i am using the following code to achieve this effect:



        
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  • 2021-02-07 20:47

    I see a lot of answers here doing this the hard way. If you have 2 images and you want to flip them based on focus, do it the easy way:

    Step 1: Copy both images into a drawables folder:

    Example: mycon_focused.png, mycon.png

    Step 2: Create a selector xml file in drawables: Example "marker.xml"

    <?xml version="1.0" encoding="utf-8"?>
    <selector xmlns:android="http://schemas.android.com/apk/res/android">
         <item android:state_focused="true" android:drawable="@drawable/mycon_focused"/>
         <item android:state_focused="false" android:drawable="@drawable/mycon" />
    </selector>
    

    Step 3: When you create your ItemOverlay and add the OverlayItems drawable, use

    getResources().getDrawable(R.drawable.marker);
    

    instead of

    getResources().getDrawable(R.drawable.mycon);
    

    and then programically changing it in the on tap method. After reading through many answers and not seeing this anywhere I just tried it myself, and it worked perfectly.

    Much thanks to previous contributors, without your help I wouldn't have had a starting point.

    Another note: If you're using Sherif elKhatib suggested code and your marker position is off try:

    int width = marker.getIntrinsicWidth();
    int height = marker.getIntrinsicHeight();
    marker.setBounds(-(width/2),-height,(width/2),0);
    

    instead of

    marker.setBounds(0,0,marker.getIntrinsicWidth(),marker.getIntrinsicHeight());
    

    This should center it perfectly.

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  • 2021-02-07 20:54

    I have no idea what view1ComplainPoleList is and whether it is impacting matters. I handled this by subclassing OverlayItem and overriding getMarker() to return the proper image. Here is the sample project in which I use this technique.

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  • 2021-02-07 21:02

    This is very simple to do:

    protected boolean onTap(int index) {
        OverlayItem item = mOverlays.get(index);
        //Get the new Drawable
        Drawable marker = mContext.getResources().getDrawable(R.drawable.icon);
        //Set its bounds
        marker.setBounds(0,0,marker.getIntrinsicWidth(),marker.getIntrinsicHeight());
        //Set the new marker
        item.setMarker(marker);
        //Return true! Do not invalidate
        return true;
    }
    
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  • 2021-02-07 21:08

    Use Setbounds api to set the bounds as follows: Edited your original code

    protected boolean onTap(int index) {
        OverlayItem item = mOverlays.get(index);
        if(item.getTitle().equals("true")){
            if(item.getMarker(OverlayItem.ITEM_STATE_FOCUSED_MASK).equals(greenMarker)){
                orangeMarker.setBounds(0,0,orangeMarker.getIntrinsicWidth(),orangeMarker.getIntrinsicHeight());
                item.setMarker(orangeMarker);
                view1ComplainPoleList.add(item.getSnippet());
                Log.i("adding",item.getSnippet());
                map.invalidate();
            }
            else{
                greenMarker.setBounds(0,0,greenMarker.getIntrinsicWidth(),greenMarker.getIntrinsicHeight());
                item.setMarker(greenMarker);
                view1ComplainPoleList.remove(item.getSnippet());
                Log.i("removing",item.getSnippet());
                map.invalidate();
            }
        }
        return true;
    }
    
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