Add annotation to pdf android
<p>I want to display pdf in android for that i have user some libraries like vudroid,pdfreader but all these libraries show pdf pages as image i want to implement such functionality that user can view pdf and select text from pdf change background color of text using color picker and save the existing pdf, i have referred some of libraries but they doesn't provide such functionality,please give some idea if such library is available</p>

<p>I have used following libraries</p>

<pre><code>Android PDF Viewer
APDFViewer
droidreader
</code></pre>

<p>Thanks  </p>
