从ItemizedOverlay类开始活动

Question

我正在尝试获取一个将ItemizedOverlay扩展到startActivity的类，但是有一个问题，它就是不能编译。我有一个使用ItemizedOverlay类绘制覆盖图的MapView，但我想要在点击屏幕时启动和活动。

你知道怎么解决这个问题吗？谢谢

protected boolean onTap(int index) {
     OverlayItem item = overlays.get(index);

     String split_items = item.getSnippet();
     Intent intent = new Intent();
     intent.setClass(mainmenu,poiview.class);
     startActivity(intent);


     return true;
   }

Answer 1

我遇到了这个问题，所以我测试了下面的例子。该解决方案依赖于从MapActivity上下文调用"startActivity“。

如果您的地图实际上正在处理覆盖，那么您已经将MapView上下文传递给了自定义ItemizedOverlay构造函数，并且可能将MapView上下文分配给了一个名为mContext的类变量(我假设您遵循了谷歌的MapView示例)。因此，在自定义Overlay的onTap函数中，执行以下操作：

        @Override
    protected boolean onTap(int index) {

      Intent intent = new Intent(mContext, ActivityYouAreTryingToLaunch.class);
      mContext.startActivity(intent);


      return true;
    }   

但是，您可能希望将某些内容传递给您正在尝试启动的新活动，以便您的新活动可以对您的选择执行一些有用的操作。所以..。

    @Override
protected boolean onTap(int index) {

  OverlayItem item = mOverlays.get(index);
  //assumption: you decided to store an "id" in the snippet so you can associate this map location with your new Activity
  long id = Long.parseLong(item.getSnippet()); //Snippet is a built-in String property of an Overlay object.  

    //pass an "id" to the class so you can query
    Intent intent = new Intent(mContext, ActivityYouAreTryingToLaunch.class);
    String action = Intent.ACTION_PICK; //You can substitute with any action that is relevant to the class you are calling
    //I create a URI this way because I append the id to the end of the URI (lookup the NotePad example for help because there are many ways to build a URI)
    Uri uri = ContentUris.withAppendedId(Your_CONTENT_URI, id);
    //set the action and data for this Intent
    intent.setAction(action);
    intent.setData(uri);
    //call the class
    mContext.startActivity(intent);  

  return true;
}

Answer 2

试试这个，我已经在警告对话框中设置了一个肯定按钮...

protected boolean onTap(int index)  {
AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
dialog.setTitle(item.getTitle());
dialog.setIcon(R.drawable.info_icon);
dialog.setPositiveButton("Details", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
    Intent placeDetailsMapIntent = new Intent(mContext, PlaceDetailsActivity.class);
    mContext.startActivity(placeDetailsMapIntent);
         }

})；

Answer 3

试着使用下面的

Intent intent = new Intent(mainmenu.this, poview.class);
startActivity(intent);