title: Why is no Activity found to handle Intent?
body: <p>Instead of going the regular <code>getPackageManager().getLaunchIntentForPackage("com.example.app")</code> way, I want to create the launch intent by myself.</p>
  
  <pre><code>Intent intent = new Intent(Intent.ACTION_MAIN);
  intent.addCategory(Intent.CATEGORY_LAUNCHER);
  intent.setPackage("com.example.app");
  startActivity(intent);
  </code></pre>
  
  <p>Why does Android not find the Activity, if the <code>com.example.app</code> is installed, enabled and has a correct manifest? (It works perfectly with <code>getLaunchIntentForPackage</code>.)</p>