title: Set time appearance for Toast.makeText
body: <pre><code>Toast.makeText(getApplicationContext(), getString(R.string.negative), Toast.LENGTH_SHORT).show();
  </code></pre>
  
  <p>How do I set a time appearance for this and make this <em>cancelable</em>.
  Also how do I set this one to appear in the <em>middle</em> part of the screen ?    </p>