Why do many android classes (examples and source) begin with "m"?

I have been looking over some of the android source, and the examples given in the Dev guide, and I notice that many of their classes begin with the letter m, as in the example below:

    // Create an anonymous implementation of OnClickListener
private OnClickListen开发者_如何学JAVAer mCorkyListener = new OnClickListener() {
    public void onClick(View v) {
      // do something when the button is clicked
    }
};

From this page: http://developer.android.com/guide/topics/ui/ui-events.html

What does the m signify?

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The prefix 'm' is a naming convention used to denote private member variables and methods.

Various communities no longer use this convention, but apparently the person(s) who created the android documentation still follow that convention.

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Well, the class doesn't begin with an "m", the variable name does. It's just a convention used to indicate that this is a member variable