Show context menu from code behind

This might be a simple question, but I've been looking around and can't find the answer. Is there any code to show the context menu on Android from a code, instead of pressing the menu button? E.g. when I touch the screen then it'll 开发者_C百科call the context menu?

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Call openContextMenu() on your Activity whenever you want to open it. Note that this is a rather unusual UI pattern, one that your users may not expect.

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 OnClickListener onClick_Show_Contextmenu = new OnClickListener() {
            @Override
            public void onClick(View v) {
                ((Activity) context).openContextMenu(v);
            }

        };

        findViewById(R.id.xxx).setOnClickListener(onClick_Show_Contextmenu);

        registerForContextMenu(findViewById(R.id.xxx));
        findViewById(R.id.xxx).setLongClickable(false);

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you can use any of the following:

1. openContextMenu as shown here:

registerForContextMenu(view); 
openContextMenu(view);
unregisterForContextMenu(view);

1. setOnCreateContextMenuListener

2. showContextMenuForChild

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You can use

view.showContextMenu();

on your view.