title: multiple targets in android studio
body: <p>I am handling a project for education university ,where there are <strong>5 seperate universities</strong> <strong>each university having there own app</strong> but in each application <strong>images ,json</strong> differs and the  <strong>source code</strong> remains same .
  <em>i want to create 5seperate apks with different package name using only one source code and if any change done in source code should update in all apks.</em></p>
  
  <p>please give me structure of project ,graddle.build tool setting and if i need to make library how and where it will be, or please upload a sample to do above type in detail.</p>