How to add item to arraylist with button click?

Question

Something is wrong with my code. In the application, when I "add item", it doesn't show anything, and if I am clicking somewhere around the Android application, then "item" sometimes comes. Can somebody help me?

package com.example.proov;

import java.util.ArrayList;

import com.example.proov.R;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;

public class proovin extends Activity {
    private ListView LView;


    ArrayList <String>ar = new ArrayList<String>();

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        LView = (ListView) findViewById(R.id.ListView01);
        //      Set option as Multiple Choice. So that user can able to select more the one option
                LView.setAdapter(new ArrayAdapter<String>(this,
                        android.R.layout.simple_list_item_multiple_choice, ar));
                LView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

             Button b = (Button) findViewById(R.id.add_item);
             final EditText d = (EditText) findViewById(R.id.title);
             b.setOnClickListener(new View.OnClickListener() {

                    @Override
                    public void onClick(View v) {
                        ar.add(d.getText().toString()); 

                    }
                });
    }
}

Dipak Keshariya · Accepted Answer · 2012-08-21 05:43:16Z

Use below code instead of your code.

public class proovin extends Activity {

    private ListView LView;
    ArrayList <String>ar = new ArrayList<String>();

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        LView = (ListView) findViewById(R.id.ListView01);
        // Set option as Multiple Choice. So that user can able to select more
        // the one option
        final ArrayAdapter<String> adpt=new ArrayAdapter<String>(this,
                android.R.layout.simple_list_item_multiple_choice, ar);
        LView.setAdapter(adpt);
        LView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        Button b = (Button) findViewById(R.id.add_item);
        final EditText d = (EditText) findViewById(R.id.title);
        b.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                ar.add(d.getText().toString());
                adpt.setNotifyOnChange(true);
                LView.setAdapter(adpt);
            }
        });
    }
}

Cheryl Simon · Accepted Answer · 2010-09-01 18:05:14Z

1

The item is likely getting added to the ArrayList, but that is different from getting added to the ListView. You need to tell the ListView that you updated the data model so that it knows to look. See ArrayAdapter.notifyDatasetChanged()

answered Sep 1, 2010 at 18:05

Cheryl Simon

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Comments

krishna kumar · Accepted Answer · 2013-03-20 13:32:51Z

you can use this add string to list on a button click

final String a[]={"hello","world"};
final ArrayAdapter<String> at=new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,a);
final ListView sp=(ListView)findViewById(R.id.listView1);
sp.setAdapter(at);
final EditText et=(EditText)findViewById(R.id.editText1);
Button b=(Button)findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() 
    {

        @Override
        public void onClick(View v) 
        {
            // TODO Auto-generated method stub
            int k=sp.getCount();
            String a1[]=new String[k+1];
            for(int i=0;i<k;i++)
                a1[i]=sp.getItemAtPosition(i).toString();
            a1[k]=et.getText().toString();
            ArrayAdapter<String> ats=new ArrayAdapter<String>(getApplicationContext(), android.R.layout.simple_list_item_1,a1);
            sp.setAdapter(ats);
        }
    });

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