Htykuut

I having some trouble with how to use a Button to access another activity with data from firebase. I'm just getting an error "Can't pass null for argument 'pathString' in child()". But when I try in another activity with OnItemClick on a listview item it works. Why is that?

What I'm trying to do is: I have a activity with a listview that stores and get data from firebase. What I want is, if I click on one of the items in that listview I want a new activity with buttons, and these buttons will get me to another activity with a listview that are related to the first activity (related data). So the activity with the buttons are the same activity for every listview items i click on, like just a "dummy" activity. Is this possible?

Here is the code:

lvjobbinfo works fine, but add doesn't. I want lvjobbinfo and add to do the same.

public class MainActivity extends AppCompatActivity {



EditText etinfonavn;

ListView lvjobbinfo;

TextView tvjobbnavn;

Button add;



DatabaseReference databaseJOBBINFO;



List<Main> jobbinfo;



public static final String infonavn = "infonavn";

public static final String infoid = "infoid";







@Override

protected void onCreate(Bundle savedInstanceState) {

    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_main);



    databaseJOBBINFO = FirebaseDatabase.getInstance().getReference().child("Jobbinfo");





    lvjobbinfo = (ListView)findViewById(R.id.lvjobbinfo);





    lvjobbinfo.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {

        @Override

        public boolean onItemLongClick(AdapterView<?> adapterView, View view, int i, long l) {



            Main main = jobbinfo.get(i);



            Intent intent = new Intent(getApplicationContext(), Notater.class);



            intent.putExtra(infoid, main.getInfoId());

            intent.putExtra(infonavn, main.getInfonavn());



            startActivity(intent);



            return true;





        }

    });



    tvjobbnavn = (TextView)findViewById(R.id.tvjobbnavn);

    etinfonavn = (EditText) findViewById(R.id.etinfonavn) ;

    add  = (Button)findViewById(R.id.add);



    add.setOnClickListener(new View.OnClickListener() {

        @Override

        public void onClick(View view) {

            Intent add = new Intent(MainActivity.this, Notater.class);

            startActivity(add);

        }

    });









    Intent intent = getIntent();



    jobbinfo = new ArrayList<>();





    String id = intent.getStringExtra(Jobbliste.jobbId);

    String navn = intent.getStringExtra(Jobbliste.jobbnavn);



    tvjobbnavn.setText(navn);



    databaseJOBBINFO = FirebaseDatabase.getInstance().getReference("Jobbinfo").child(id);









}

@Override

protected void onStart() {

    super.onStart();



    databaseJOBBINFO.addValueEventListener(new ValueEventListener() {

        @Override

        public void onDataChange(DataSnapshot dataSnapshot) {

            jobbinfo.clear();



            for (DataSnapshot infosnapshot : dataSnapshot.getChildren()) {



                final Main main = infosnapshot.getValue(Main.class);

                jobbinfo.add(main);





                final listMain infolistadapter = new listMain(MainActivity.this, jobbinfo);



                lvjobbinfo.setAdapter(infolistadapter);



                infolistadapter.notifyDataSetChanged();



            }









        }



        @Override

        public void onCancelled(DatabaseError databaseError) {









    }

});