Dynamically add text to the recyclerview from the edittext input

Question

Having difficulty constantly getting values from the editview and displaying it in the recyclerview one below the other. The code below uses a preset array of string to display the text which is simpler.

Mainactivity

Context context;
RecyclerView recyclerView;
RelativeLayout relativeLayout;
RecyclerView.Adapter recyclerViewAdapter;
RecyclerView.LayoutManager recylerViewLayoutManager;
String[] subjects =
        {
                "First Text",
                "Second Text",
                "Third Text",
                "Fourth Text",
                "Fifth Text",
                "Sixth Text",
        };

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_ACTION_BAR);

    setContentView(R.layout.activity_main);

    context = getApplicationContext();

    relativeLayout = (RelativeLayout) findViewById(R.id.relativelayout1);

    recyclerView = (RecyclerView) findViewById(R.id.recyclerview1);

    recylerViewLayoutManager = new LinearLayoutManager(context);

    recyclerView.setLayoutManager(recylerViewLayoutManager);

    recyclerViewAdapter = new RecyclerViewAdapter(context, subjects);

    recyclerView.setAdapter(recyclerViewAdapter);
}

Tried to this using the code below but it only updates the textview rather than keep posting new text one below the other

 public void SendButton(View view){
    // EditText
    EditText editText = (EditText) findViewById(R.id.editText);
    String editTextValue = editText.getText().toString();

    // TextView
    TextView textView = (TextView) findViewById(R.id.subject_textview);
    textView.setText(editTextValue);
    }

The adapter is for the preset array version

   public RecyclerViewAdapter(Context context1,String[] SubjectValues1){

    SubjectValues = SubjectValues1;
    context = context1;
}

public static class ViewHolder extends RecyclerView.ViewHolder{

    public TextView textView;

    public ViewHolder(View v){

        super(v);

        textView = (TextView)v.findViewById(R.id.subject_textview);
    }
}

@Override
public RecyclerViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType){

    view1 = LayoutInflater.from(context).inflate(R.layout.recyclerview_items,parent,false);

    viewHolder1 = new ViewHolder(view1);

    return viewHolder1;
}

@Override
public void onBindViewHolder(ViewHolder holder, int position){

    holder.textView.setText(SubjectValues[position]);
}

@Override
public int getItemCount(){

    return SubjectValues.length;
}

Been trying to get this to work for a while, but no luck, so would appreciate if someone helped me with this.

could you provide recyclerViewAdapter code? – MeLean Jan 28 '18 at 20:23 — MeLean, Jan 28 '18 at 20:23

score 0 · Accepted Answer · answered Jan 28 '18 at 20:46

0

Change SubjectValues to List in order to be able to add items. And change your constructor like this:

 public RecyclerViewAdapter(Context context1,String[] SubjectValues1){

    SubjectValues = new ArrayList<String>(Arrays.asList(SubjectValues1));
    context = context1;
}

Then add method in your Adapter:

public void addItem(String subject) {
  SubjectValues.add(subject);
  mAdapter.notifyItemInserted(SubjectValues.size());
}

If you want to add more then one value use this:

public void addAllItem(List<String> subjects) {
  int startingPosition = SubjectValues.size();
  SubjectValues.addAll(subjects);
  mAdapter.notifyItemInserted(startingPosition, subjects.size());
}

Then change your SendButon method like this:

public void SendButton(View view){
    // EditText
    EditText editText = (EditText) findViewById(R.id.editText);
    String editTextValue = editText.getText().toString();

     recyclerViewAdapter.addItem(editTextValue )
}

answered Jan 28 '18 at 20:46

MeLean

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The SubjectValues line in the constructor is giving an error – George Jan 28 '18 at 21:10
Did you change its type to: List SubjectValues; – MeLean Jan 28 '18 at 21:11
No problem. I am glad to be of help. – MeLean Jan 28 '18 at 21:17
I have two more questions I would like to ask; What is the .addItem in the sendbutton method, and what is the mAdapter. in the addAllItem method – George Jan 28 '18 at 21:35
look at this https://stackoverflow.com/questions/26076965/android-recyclerview-addition-removal-of-items post if your questions has an answers there. – MeLean Jan 28 '18 at 21:38

Dynamically add text to the recyclerview from the edittext input

1 Answers1