问题
I have a custom titlebar with an ImageButton, which produces a dialogbox, and I want to be able to show location(place itemizedOverlay) on a map(in another class) when list item is selected from dialog box, and titlebar and map are in the same context. I read somewhere that I could call a method of another class using contexts. How can I do so?
public class MyTitleBar extends RelativeLayout{
private Context context;
public MyTitleBar(Context context, AttributeSet attrs) {
super(context, attrs);
this.context = context;
}
@Override
protected void onFinishInflate() {
super.onFinishInflate();
initViews();
}
// set up all the buttons & clicks
private void initViews() {
final ImageButton listImgBtn = (ImageButton) findViewById(R.id.more);
final CharSequence [] listItems = {"Elderly","Events"};
listImgBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if(context instanceof UserHome)
{
AlertDialog.Builder builder = new AlertDialog.Builder(context);
builder.setTitle("List");
builder.setItems(listItems, new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int item) {
// TODO Auto-generated method stub
if(item == 0)
{
//show location of elderly
//DisplayLocation()
}
else if(item == 1)
{
//show location of events
}
}
});
AlertDialog alert = builder.create();
alert.show();
}
}
});
回答1:
It looks like I can do this like so:
UserHome userhome = (UserHome)context;
userhome.DisplayLocation();
where DisplayLocation() in the UserHome Activity. Simple.
来源：https://stackoverflow.com/questions/11635086/calling-method-of-another-class-using-contexts