title: Passing data from one app to another one
body: <p>I have 2 android apps:</p>
  
  <pre><code>app1 - Activity11 --&gt; Activity12 --&gt; Activity13
  
  app2 - Activity21 --&gt; Activity22 --&gt; Activity23
  </code></pre>
  
  <p>I want to pass from one app to <strong>the second</strong> Activity of the other one, <strong>passing some datas</strong>. </p>
  
  <pre><code>app1 - Activity11 --&gt;(switch to app2)--&gt; Activity22 --&gt; Activity23
  </code></pre>
  
  <p>What steps have i to follow? Do you know some tutorial?</p>
  
  <p>I haven't write code for now, because I don't know where to start.</p>
  
  <p>Thanks in advance.</p>