How to save the position of a ScrollView when the orientation changes in Android July 28, 2011

To save and restore the scroll position of a ScrollView when the phone orientation changes you can do the following:
Save the current position in the onSaveInstanceState method:

    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putIntArray("ARTICLE_SCROLL_POSITION",
                new int[]{ mScrollView.getScrollX(), mScrollView.getScrollY()});
    }

Then restore the position in the onRestoreInstanceState method, note that we need to post a runnable to the ScrollView to get this to work:

    protected void onRestoreInstanceState(Bundle savedInstanceState) {
        super.onRestoreInstanceState(savedInstanceState);
        final int[] position = savedInstanceState.getIntArray("ARTICLE_SCROLL_POSITION");
        if(position != null)
            mScrollView.post(new Runnable() {
                public void run() {
                    mScrollView.scrollTo(position[0], position[1]);
                }
            });
    }

Make the backspace key work in Firefox on Linux July 21, 2011

To make the backspace key in Firefox on Linux take you back to the previous page as it does on other platforms and in other browsers do the following:

1. put about:config in the address bar and hit enter
2. scroll down to browser.backspace_action and double click it
3. set the value to 0

Commit working directory changes to a new branch in git July 1, 2011

To create and checkout a new branch in git taking any uncommitted changes with you use:

git checkout -b my_new_branch