android - 完成 Activity - Google map Android

Question

我正在使用 Android 版 Google map 做一个项目。我创建了一个 MapActivity 来加载我保存在服务器上的一些地方。所以我有这门课

public class PlaceItemizedOverlay extends ItemizedOverlay<OverlayItem> {

    private ArrayList<OverlayItem> mOverlays = new ArrayList<OverlayItem>();
    Context mContext = null;
    MapActivity mapAct = null;

    public PlaceItemizedOverlay(Drawable defaultMarker, MapActivity map) {
          super(boundCenterBottom(defaultMarker));
              this.macAct = map;
    }

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

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

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


    @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();

     this.mapAct.finish();

      return true;
    }

好吧，当我点击保存的地方时，程序中断了。

我正在 mapActivity 上创建对象:

PlaceItemzedOverlay itemizedoverlay = new PlaceItemizedOverlay(drawable, this);

你能帮帮我吗？

非常感谢!

Answer 1

问题在这里//你的部分代码

  @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();//here you show a alert dialog on current activity 

  //this.mapAct.finish();//and here you finish current activity

  return true;
}

在这种情况下应用程序崩溃..并使用

finish(); 

为了你的

 this.mapAct.finish();