为什么getOverlays（）是未定义的MapView？

问题描述

我的qestion可能很容易sinse我的Andr​​oid初学者。

My qestion might be easy sinse I'm android begginer.

我继的

和在创建地图活动的第一部分有成功。
但现在我想补充一个覆盖项目。现在的问题是在我的.java code：

and have succeed in a first part of creating a map activity.But now I'm trying to add an overlay items. The problem is in my .java code:

    List<Overlay> mapOverlays = mapView.getOverlays();

此行是所有教程psented $ P $。但我得到类似的错误信息：该方法getOverlays）（未定义该类型的MapView。
任何人可以帮助我解决这个问题？

this line is presented in all tutorials. But I get the error message like: 'The method getOverlays() is undefined for the type MapView'.Can anybody help me to solve it?

code：

    package com.example.mapsdemo;
    import java.util.List;
    import com.google.android.gms.maps.MapView;
    import com.google.android.maps.GeoPoint;
    import com.google.android.maps.Overlay;
    import com.google.android.maps.OverlayItem;
    import android.app.Activity;
    import android.graphics.drawable.Drawable;
    import android.os.Bundle;

    public class MainActivity extends Activity {

private MapView mapView;

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

    List<Overlay> mapOverlays = mapView.getOverlays();
    Drawable drawable = this.getResources().getDrawable(R.drawable.marker);
    HelloItemizedOverlay itemizedoverlay = new HelloItemizedOverlay(drawable, this);

    GeoPoint point = new GeoPoint(19240000,-99120000);
    OverlayItem overlayitem = new OverlayItem(point, "Hola, Mundo!", "I'm in Mexico City!");

    itemizedoverlay.addOverlay(overlayitem);
    mapOverlays.add(itemizedoverlay);

    }
}

第二类是在这里：

    public class HelloItemizedOverlay extends ItemizedOverlay {

private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
public Context mContext ;

public HelloItemizedOverlay(Drawable defaultMarker) {
      super(boundCenterBottom(defaultMarker));
    }

public HelloItemizedOverlay(Drawable defaultMarker, Context context) {
      super(boundCenterBottom(defaultMarker));
      mContext = context;
    }

public void addOverlay(OverlayItem overlay) {
    mOverlays.add(overlay);
    populate();
}

@Override
protected OverlayItem createItem(int i) {
  return mOverlays.get(i);
}

@Override
public int size() {
  return mOverlays.size();
}

@Override
protected boolean onTap(int index) {
  OverlayItem item = mOverlays.get(index);
  AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
  dialog.setTitle(item.getTitle());
  dialog.setMessage(item.getSnippet());
  dialog.show();
  return true;
}

}

感谢您的帮助！

推荐答案

您在混合德precated API与V1 V2 API

You are mixing deprecated API v1 with API v2.

我建议删除所有code和下面这个：

I'd suggest removing all the code and following this instead: https://developers.google.com/maps/documentation/android/start

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