title: Android - reopen main activity from notification
body: <p>Launcher activity for my app is called <strong>LaunchActivity</strong>. Inside this activity I check if the user is logged. If yes, then a network call is made to validate the user and if everything is fine <strong>MainActivity</strong> is started. If user runs app for first time or user validation fails, <strong>LoginActivity</strong> runs.</p>
  
  <p>Inside LaunchActivity there is function that runs appropriate activity:</p>
  
  <pre><code>private void start(Class&lt;? extends Activity&gt; startActivity) {
  
      Intent intent = new Intent(this, startActivity);
      intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);
      finish();
      startActivity(intent);
  }
  </code></pre>
  
  <p>App is receiving notifications. After notification click i want to open app or bring it top if it is on background. </p>
  
  <p>Code responsible for notification intent:</p>
  
  <pre><code>   Intent intent = new Intent(context, LaunchActivity.class);
      intent.putExtra("SHOW_NOTIFICATION_LIST", "");
      intent.setAction(Intent.ACTION_MAIN);
      intent.addCategory(Intent.CATEGORY_LAUNCHER);
  
      PendingIntent notificationIntent = PendingIntent.getActivity(
              context,
              0,
              intent,
              0);
      builder.setContentIntent(notificationIntent);
  
      Notification notification = builder.build();
  </code></pre>
  
  <p>The problem is that with my current implementation after click, LaunchActivity is reopened even when MainActivity is on background. I can not figure out how to make the pending intent reopen just <strong>MainActivity</strong> (without LaunchActivity and valdation) if it is on background OR start <strong>LaunchActivity</strong> when there are no activity running on background ( app is not running ). I would be very grateful for any kind of help. </p>
  
  <p>edit:</p>
  
  <p>Activities declaration inside manifest:</p>
  
  <pre><code>        &lt;activity android:name=".activities.LaunchActivity" &gt;
          &lt;intent-filter&gt;
              &lt;action android:name="android.intent.action.MAIN" /&gt;
  
              &lt;category android:name="android.intent.category.LAUNCHER" /&gt;
          &lt;/intent-filter&gt;
      &lt;/activity&gt;
      &lt;activity
          android:name=".activities.MainActivity"
          android:launchMode="singleTop"
          android:screenOrientation="userPortrait" /&gt;
      &lt;activity
          android:name=".activities.LoginActivity"
          android:excludeFromRecents="true"
          android:launchMode="singleTop"
          android:noHistory="true"
          android:screenOrientation="userPortrait"
          android:windowSoftInputMode="adjustResize" &gt;
      &lt;/activity&gt;
  </code></pre>