EditText of input type with number of no duplicates in android
<p>Could anyone please tell me how to implement an <code>EditText</code> which only accepts numbers and won't allow any duplicated digits?</p>

<p>For example, <code>123</code> or <code>234</code> would be fine, but <code>112</code> and <code>223</code> should not be allowed.</p>
