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    <p>If you have an <code>EditText</code> and you assign an <code>InputFilter</code> to it, then everytime you change the text in there the <code>filter()</code> method will be called. Much like the <code>onClick()</code> method of a button.</p> <p>Let's say you had the text "Hello Androi" in your EditText before editing it. If you press the <code>D</code> key on your virtual keyboard then the inputfilter is triggered and basically asked if it is ok to add a <code>d</code>.</p> <p>In that case <code>source</code> is "Android", start is 6, end is 7 - That is your reference to the new Text.</p> <p><code>dest</code> would be "Androi" and refers to the old text in your <code>EditText</code></p> <p>So you get the new String and a position in that string (the 6,7) that you have to check if it is okay. If you would just get a single character (like the <code>d</code>) you could not decide if e.g. the number you just entered forms an ip adress. You need the whole text as a context in some cases.</p> <p>If the new text is ok as is return <code>null</code>, if you want to skip a change return empty String (<code>""</code>), otherwise return the characters that replace the change.</p> <p>So a simple example might be that:</p> <pre><code>/** * Simplified filter that should make everything uppercase * it's a demo and will probably not work * - based on InputFilter.AllCaps */ public static class AllCaps implements InputFilter { public CharSequence filter(CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { // create a buffer to store the edited character(s). char[] v = new char[end - start]; // extract the characters between start and end into our buffer TextUtils.getChars(source, start, end, v, 0); // make the characters uppercase String s = new String(v).toUpperCase(); // and return them return s; } } </code></pre> <p>It's replacing every change with the uppercase version of it.</p>
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