title: launch activities from different package
body: <p>I have activity A in  package one, and I want to run an intent which will up an activity B which is in package two.</p>
  
  <p>How can I do this? Any samples will be welcome.</p>
  
  <p>this is what ive done, and the error i get:</p>
  
  <p>first activity ("MainActivity") in a package: com.abelski.currencyclient
  and second activity("SecondActivity" in a diffrent package: com.idan.second</p>
  
  <p>now i wanna call from MainActivity to SecondActivity.</p>
  
  <p>ive added this line at the manifest of the MainActivity:</p>
  
  <pre><code> &lt;activity android:name="com.idan.second.SecondApplicationActivity"&gt;&lt;/activity&gt;
  </code></pre>
  
  <p>now in main Activity i got this button which run this line:</p>
  
  <pre><code>Intent intent = new Intent(MainActivity.this,SecondApplicationActivity.class); 
  </code></pre>
  
  <p>and this is the rror:</p>
  
  <pre><code>04-29 09:20:59.197: ERROR/AndroidRuntime(399): Uncaught handler: thread main exiting due to uncaught exception
  04-29 09:20:59.276: ERROR/AndroidRuntime(399): java.lang.NoClassDefFoundError: com.idan.second.SecondApplicationActivity
  04-29 09:20:59.276: ERROR/AndroidRuntime(399):     
  </code></pre>