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我有一个带有 itemizedoverlays 的地图视图,就像在 android 开发人员指南的示例中一样:http: //developer.android.com/resources/tutorials/views/hello-mapview.html

在 itemizedoverlay 上,我有一个带有按钮的个性化对话框。一切都很好,直到这里,但现在我在尝试将功能添加到按钮时遇到问题。我需要按钮开始是一项新活动,但我无法实现.... ¿为什么?因为在这一行上:i = new Intent (NyItemizedOverlay.class, Locate.class);我将当前 Intent 类作为第一个参数,将目标 Intent 类作为第二个参数。

MyItemizedOverlay 不是 Intent 类...它是 ItemizedOverlay 扩展,然后当我尝试启动意图时它不会编译,我试图将普通类作为第一个参数传递,它需要一个意图类。我必须放置启动器类,但启动器类不是意图:S

如果我尝试在第一个参数上放置另一个意图类,我会收到此错误:No enclosing instance of the type AllActivity is accessible in scope ....(AllActivity 是我的应用程序的公共活动类)

我怎么能解决这个问题?

完整代码在这里:

public class MyItemizedOverlay extends ItemizedOverlay {


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

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

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

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

 public void addOverlay(OverlayItem overlay) {
     mOverlays.add(overlay);
     populate();
 }
 public void addOverlay(OverlayItem overlay,String permission) {
     mOverlays.add(overlay);
     permissions.add(permission);
     populate();
 }

 public MyItemizedOverlay(Drawable defaultMarker, Context context) {
    //super(defaultMarker);
    super(boundCenterBottom(defaultMarker));
    mContext = context;
 }
 public void clear()
 {
  mOverlays.clear();
  permissions.clear();//lista de permisos de cada usuario, ya que hay dos campos, el email (snippet) y el permission, una lista.
 }

 protected boolean onTap(int index) {
   try{
    OverlayItem item = mOverlays.get(index);
    if (permissions.size()==0)
    {     
     AlertDialog.Builder dialog = new AlertDialog.Builder(mContext);
     dialog.setTitle(item.getTitle());
     dialog.setMessage(item.getSnippet());
     dialog.show();
    }
    else
    {

    //set up dialog
    Dialog dialog = new Dialog(mContext);
    dialog.setContentView(R.layout.personal_dialog);
    dialog.setTitle(item.getTitle());
    dialog.setCancelable(true);
    //there are a lot of settings, for dialog, check them all out!


    //set up text
    TextView DialogEmail = (TextView) dialog.findViewById(R.id.DialogEmail);
    TextView DialogPermission = (TextView) dialog.findViewById(R.id.DialogPermission);
    DialogEmail.setText(item.getSnippet());
    DialogPermission.setText(permissions.get(index));

    final String userName=item.getTitle();
    final String email=item.getSnippet();
    final int cont=index;
    //set up button
    Button button = (Button) dialog.findViewById(R.id.DialogButton);
    button.setOnClickListener(new OnClickListener() {
     @Override
     public void onClick(View v) {
      //do something
      Bundle bundle = new Bundle(); //bundle is like the letter
      bundle.putString ("user",userName ); //arg1 is the keyword of the txt, arg2 is the txt
            bundle.putString ("email", email);
            bundle.putString ("permission", permissions.get(cont));
            Intent i=null;

             i = new Intent (MyItemizedOverlay.class, Locate.class);

            i.putExtras(bundle);
            startActivity(i);
     }
    });
    //now that the dialog is set up, it's time to show it    
    dialog.show();

    }
   }catch(Exception e){}
   return true;
 }


}
4

3 回答 3

4

Intent javadoc清楚地表明,第一个 arg 必须是 Context(由活动扩展),第二个是您尝试启动的活动的类。在您的情况下,您需要执行以下操作:

Intent intent = new Intent(mContext, AllActivity.class);
mContext.startActivity(intent);
于 2010-12-15T14:21:25.243 回答
3

通常,Intent 将其中一个构造函数Context作为第一个参数,将一个Activity类作为第二个参数。因此,请执行以下操作:

Intent intent = new Intent(mContext, AllActivity.class);
mContext.startActivity(intent);
于 2010-12-15T14:19:04.950 回答
0

对于意图构造函数,它应该传递Context实现此类的应用程序包的 A,检查this。这不是意图。
它必须是一些活动,比如说MyClass使用你的 MyItemizedOverlay 类。最好的办法是在那里声明一个static Context发言权myContext并声明它的价值,如myContext = MyClass.this;. onCreate然后你可以像这样声明意图

 new Intent (MyClass.myContext , Locate.class);
于 2010-12-15T14:34:53.150 回答