Sending Data From One Screen To Another in App Inventor 2

Question

enter image description hereenter image description hereSo I'm working on an app where when the user clicks a title in a list picker, another screen opens and the picture of the place is shown. I've been looking around and I can't figure out how to send the data from one screen to another along with the data of a picture. I've seen the use of Tinydb, but I'm honestly very confused about it. I'm using MIT App Inventor 2 btw. I've included images to help with my confusion

Answer 1

1. Using Static Variable :

   • If the title data is static then you can define it as static so that way it will be the same copy for all the objects of Screen1.
   • Now you can access it from Screen2 by saying Screen1.title

2. Using intents to communincate

   • If the title is a data that can be passed via an intent that use to pass the title
   • For example if title is a string from Screen1 intent.putExtra("TITLE", title);

   • In Screen2 you can do the following

     String newString;
     if (savedInstanceState == null) {
          Bundle extras = getIntent().getExtras();
          if(extras == null) {
              newString= null;
          } 
          else {
               newString= extras.getString("TITLE");
          } 
     } 
     else {
               newString=(String)savedInstanceState.getSerializable("TITLE");
     }
     

3. Using interfaces for callbacks:

   • If the title is really that important you can pass an interface to Screen2 and let Screen1 class implement this interface
   • Have a reference to Screen1 class interface
   • access the title by making a callback to this class of Screen1

4. Having Direct reference to Screen1 class:

   • Let Screen2 have a direct reference to that particular object of Screen1 class that contains the title
   • That way Screen2 can access the attributes of Screen1 class
   • Remember when having a direct reference you want the same object of Screen1 to be passed you can do this by using this keyword

Answer 2

Passing Data Through Intent() is the Best way for passing data to another activity or fragment.and it is very easy to use. Refer This Link