问如何获取ActionBar MenuItem的当前位置？

EN

View mAddListingButton;

@Override
public boolean onCreateOptionsMenu(Menu menu)
{
    getMenuInflater().inflate(R.menu.activity_main, menu);
    
    // Find the menu item we are interested in.
    MenuItem it = menu.findItem(R.id.item_new_listing);
    
    // Create a new view to replace the standard one.
    // It would be nice if we could just *get* the standard one
    // but unfortunately it.getActionView() returns null.
    
    // actionButtonStyle makes the 'pressed' state work.
    ImageView button = new ImageView(this, null, android.R.attr.actionButtonStyle);
    button.setImageResource(R.drawable.ic_action_add_listing);
    // The onClick attributes in the menu resource no longer work (I assume since
    // we passed null as the attribute list when creating this button.
    button.setOnClickListener(this);
    
    // Ok, now listen for when layouting is finished and the button is in position.
    button.addOnLayoutChangeListener(new OnLayoutChangeListener() {
        @Override
        public void onLayoutChange(View v, int left, int top, int right, int bottom,
                int oldLeft, int oldTop, int oldRight, int oldBottom)
        {
            // Apparently this can be called before layout is finished, so ignore it.
            // Remember also that it might never be called with sane values, for example
            // if your action button is pushed into the "more" menu thing.
            if (left == 0 && top == 0 && right == 0 && bottom == 0)
                return;
            
            // This is the only way to get the absolute position on the screen.
            // The parameters passed to this function are relative to the containing View
            // and v.getX/Y() return 0.
            int[] location = new int[2];
            v.getLocationOnScreen(location);
            
            // Ok, now we know the centre location of the button in screen coordinates!
            informButtonLocation(location[0] + (right-left)/2, location[1] + (bottom-top)/2);
        }
    });
    
    it.setActionView(button);
    mAddListingButton = it.getActionView();
    return true;
}

private void informButtonLocation(int cx, int cy)
{
    MyHelpView v = (MyHelpView)findViewById(R.id.instructions);
    v.setText("Click this button.");
            v.setTarget(cx, cy);
}

@Override
public void onDraw(Canvas canvas)
{
    int[] location = new int[2];
    getLocationOnScreen(location);
    
    canvas.drawColor(Color.WHITE);

    mPaint.setColor(Color.BLACK);
    mPaint.setTextSize(40);
    mPaint.setAntiAlias(true);
    mPaint.setTextAlign(Align.CENTER);
    canvas.drawText(mText, getWidth()/2, getHeight()/2, mPaint);

    // Crappy line that isn't positioned right at all and has no arrowhead.
    if (mTargetX != -1 && mTargetY != -1)
        canvas.drawLine(getWidth()/2, getHeight()/2,
                mTargetX - location[0], mTargetY - location[1], mPaint);
}

    final ViewTreeObserver viewTreeObserver = getWindow().getDecorView().getViewTreeObserver();
    viewTreeObserver.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
            View menuButton = findViewById(R.id.menu_refresh);
            // This could be called when the button is not there yet, so we must test for null
            if (menuButton != null) {
                // Found it! Do what you need with the button
                int[] location = new int[2];
                menuButton.getLocationInWindow(location);
                Log.d(TAG, "x=" + location[0] + " y=" + location[1]);

                // Now you can get rid of this listener
                viewTreeObserver.removeGlobalOnLayoutListener(this);
            }
        }
    });

    View myActionView = findViewById(R.id.my_menu_item_id);
    if (myActionView != null) {
        int[] location = new int[2];
        myActionView.getLocationOnScreen(location);

        int x = location[0];
        int y = location[1];
        Log.d(TAG, "menu item location --> " + x + "," + y);
    }