Question

I am trying to do a simple task of moving a toolbar up and down on the screen, but it only works once. The toolbar moves on the press of a button to the top, but I cannot get it back to the bottom even though the message “move to bottom” appears. See the code:

    boolean toolBarAtBottom = true;

    private void moveToolBar(){
        LinearLayout toolBar = (LinearLayout) findViewById(R.id.toolBar);
        RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
                            LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT);

        lp.height = toolBar.getHeight();

        if (toolBarAtBottom){ 
            lp.addRule(RelativeLayout.ALIGN_TOP, RelativeLayout.TRUE);
        }else{  
            lp.addRule(RelativeLayout.ALIGN_BOTTOM, RelativeLayout.TRUE);
            Toast.makeText(DrawActivity.this, "move to bottom", Toast.LENGTH_SHORT).show();
        }
        toolBar.setLayoutParams(lp);
        toolBarAtBottom = !toolBarAtBottom;
    }

Any ideas how to make it do more than once?

Answer 1

You want to use RelativeLayout.ALIGN_PARENT_BOTTOM instead of RelativeLayout.ALIGN_BOTTOM. ALIGN_BOTTOM aligns the bottom of a view with the bottom of another view. ALIGN_PARENT_BOTTOM will move it to the bottom of its parent container.

Here is a link to the docs: http://developer.android.com/reference/android/widget/RelativeLayout.html