title: How to launch external app from an ionic4 app
body: <p>My app is under Ionic 4 for android and I have to open/run/launch external app (for exemple com.google.android.youtube or com.sygic.truck) -> for instance, any installed app.</p>
  
  <p>I tested many options without any success :</p>
  
  <p>InAppBrowserModule (using application://my.package.name).</p>
  
  <p>Cordova plugin lampaa (I didn't find any ways to use it under angular/ts app type).</p>
  
  <p>I tried also webIntent using package option and action option calling the main Activity.</p>
  
  <hr>
  
  <p>For InAppBrowserModule, i'm stuck with the http:// protocole appended before my app url.</p>
  
  <p>For Lampaa, i'm stuck with the undefined startApp (even after following other threads suggestions).</p>
  
  <p>And for webIntent, I don't think that it's relevent for my issue.</p>
  
  <p>Any suggestions ?</p>
  
  <p>Thanks in advance !</p>
  
  <hr>
  
  <p>[EDIT]</p>
  
  <p>I finally make it works !</p>
  
  <p>You can use one of those 2 lines : </p>
  
  <pre><code> this.iab.create('android-app://com.google.android.youtube',"_system");
  
   window.open('android-app://com.google.android.youtube',"_system");
  </code></pre>
  
  <p>You can replace com.google.android.youtube by any application package name !</p>