OSMDroid:onTap 示例 [英] OSMDroid: onTap example

问题描述

几周前我开始学习 Android，现在我需要你的帮助.我的任务是创建离线地图(使用 OSMDroid 和 Mobile Atlas Creator)，上面有两个标记，它们之间的路径以及单击此标记后的一些活动.我已经完成了地图、标记和路径.这是代码(Android 2.3.3):

I've started to study Android few weeks ago and now I need your help. My task is create off-line map (using OSMDroid and Mobile Atlas Creator), with two markers on it, path between them and some activity after clicking on this markers. I've done map, markers and path. Here is the code (Android 2.3.3):

公共类 MainActivity 扩展 Activity {

public class MainActivity extends Activity {

private MapView mapView;
LocationManager locationManager;
ArrayList<OverlayItem> overlayItemArray;

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    mapView = new MapView(this, 256);
    mapView.setClickable(true);
    mapView.setBuiltInZoomControls(true);
    mapView.getController().setZoom(15); 
    mapView.getController().setCenter(new GeoPoint(54.332, 48.389));  
    mapView.setUseDataConnection(false);

    overlayItemArray = new ArrayList<OverlayItem>();        
    OverlayItem olItem = new OverlayItem("Here", "SampleDescription", new GeoPoint(54.332, 48.389));       
    overlayItemArray.add(olItem);
    overlayItemArray.add(new OverlayItem("Hi", "You're here", new GeoPoint(54.327, 48.389)));

    PathOverlay myPath = new PathOverlay(Color.RED, this);
    myPath.addPoint(new GeoPoint(54.327, 48.389));
    myPath.addPoint(new GeoPoint(54.332, 48.389));
    mapView.getOverlays().add(myPath);

DefaultResourceProxyImpl defaultResourceProxyImpl = new DefaultResourceProxyImpl(this);
ItemizedIconOverlay<OverlayItem> myItemizedIconOverlay  = new ItemizedIconOverlay<OverlayItem>(overlayItemArray, null, defaultResourceProxyImpl);
    mapView.getOverlays().add(myItemizedIconOverlay);

    setContentView(mapView); //displaying the MapView
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.activity_main, menu);
    return true;
}    

}问题:如何实现这个标记的onClick方法?还有一个关于 profy 的问题:如何正确地做(我的意思是如何按类划分这个程序)?非常感谢！=)

} Question: how to realize onClick-method for this markers? And additional question for profy: how to do it right (I mean how to divide this program by classes)? Thanks a lot! =)

推荐答案

你需要新建一个类，像这样:

You need to create new class, like this:

    public class MyOwnItemizedOverlay extends ItemizedIconOverlay<OverlayItem> {
    protected Context mContext;

    public MyOwnItemizedOverlay(final Context context, final List<OverlayItem> aList) {
         super(context, aList, new OnItemGestureListener<OverlayItem>() {
                @Override public boolean onItemSingleTapUp(final int index, final OverlayItem item) {
                        return false;
                }
                @Override public boolean onItemLongPress(final int index, final OverlayItem item) {
                        return false;
                }
              } );
        // TODO Auto-generated constructor stub
         mContext = context;
    }

    @Override 
    protected boolean onSingleTapUpHelper(final int index, final OverlayItem item, final MapView mapView) {
        //Toast.makeText(mContext, "Item " + index + " has been tapped!", Toast.LENGTH_SHORT).show();
        AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
        dialog.setTitle(item.getTitle());
        dialog.setMessage(item.getSnippet());
        dialog.show();
        return true;
    }
}

下面是如何在第一个(主)类中使用它:

Here is how to use it in the first (main) class:

MapView mapView = new MapView(this, 256); //constructor
//some code from te question

ArrayList<OverlayItem> overlayItemArray = new ArrayList<OverlayItem>();                
OverlayItem olItem = new OverlayItem("Here", "SampleDescription", new GeoPoint(54.332, 48.389));//marker

MyOwnItemizedOverlay overlay = new MyOwnItemizedOverlay(this, overlayItemArray);
mapView.getOverlays().add(overlay);        
setContentView(mapView); //displaying the MapView

就是这样.祝你好运！链接:http://code.google.com/p/osmdroid/issues/detail?id=245#makechanges

That's all. Good luck! links: http://code.google.com/p/osmdroid/issues/detail?id=245#makechanges

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