我有一个MapView,与itemizedoverlays,酷似在Android开发者指南的例子:http://developer.android.com/resources/tutorials/views/hello-mapview.html可以从ItemizedOverlay类开始一个Intent吗? (MapView类项目)
在itemizedoverlay,我有一个个性化的对话,一个按钮。所有罚款直到这里,但现在我有问题试图添加功能的按钮。我需要按钮开始一个新的活动,但我无法实现....¿为什么?因为在这一行:i = new Intent (NyItemizedOverlay.class, Locate.class);
我有当前的Intent类作为第一个参数,目标意图类在第二个参数。
MyItemizedOverlay不是一个Intent类...它是ItemizedOverlay扩展,然后当我尝试启动intent时,它不编译,我试图传递一个普通类作为第一个参数,并且它需要一个intent类。我必须把发射器类,但发射器类不是一个意图:S
如果我试图把第一个参数的另一个意图类,我得到这个错误:No enclosing instance of the type AllActivity is accessible in scope
....(AllActivity是一个公共我的应用程序的活动类)
我该如何解决这个问题?
完整的代码在这里:
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;
}
}
解决!非常感谢 – NullPointerException 2010-12-15 14:49:05