CODEWITHSUNDEEP
javaandroidarraysarraylist
user3707644
user3707644

Reputation: 137

How to remove an element from a String array?

I have an array which contains three items, for example:

title_list = new String[] { title1, title2, title3 };

These values are coming from SharedPreferences. I would like to check so that if any of these values are empty they should be removed from the array.

For example, if the value of title1 is coming from another activity and is null, then title1 should be removed and the array will be String[] { title2, title3 }.

Here is my code:

package com.example.e_services;

import android.app.Activity;
import android.content.Intent;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.preference.PreferenceManager;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ListView;

public class FavList extends Activity {
    // Declare Variables
    ListView list;
    FavListViewAdapter adapter;
    String[] rank;
    String[] link;
    String[] population;
    String title1, title2;
    String link1, link2;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // Get the view from listview_main.xml
        setContentView(R.layout.listview_main2);

        SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());

        title1 = prefs.getString("title1", ""); //no id: default value
        title2 = prefs.getString("title2", ""); //no id: default value

        link1 = prefs.getString("link1", ""); //no id: default value
        link2 = prefs.getString("link2", ""); //no id: default value

        if (title1.length() == 0){
            rank[0] = null;             
        }

        // Generate sample data into string arrays
        rank = new String[] { title1, title2, "title3" };
        link = new String[] { link1, link2 };

        // Locate the ListView in listview_main.xml
        list = (ListView) findViewById(R.id.listview);

        // Pass results to ListViewAdapter Class
        adapter = new FavListViewAdapter(this, rank);
        // Binds the Adapter to the ListView
        list.setAdapter(adapter);
        // Capture ListView item click
        list.setOnItemClickListener(new OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent i = new Intent(FavList.this, WebsiteView.class);
                // Pass all data rank
                i.putExtra("Link", link);
                i.putExtra("position", position);
                //Toast.makeText(getBaseContext(), "link  "+link1,Toast.LENGTH_SHORT).show();
                startActivity(i);
            }
        });
    }
}

I tried to use

if (title1.length() == 0 ){
    title_list[0] = null;               
}

but it did not work.

Upvotes: 1

Views: 5216

Answers (1)

Jon Skeet
Jon Skeet

Reputation: 1503964

You can't remove an element from an existing array - once you have created an array, its length is fixed. You can replace elements, but you can't add or remove them.

Options:

  • Change the value of the variable to refer to a new list, e.g.

    title_list = new String[] { title_list[1], title_list[2] };

  • Use a List<String> instead, using something like an ArrayList<String> as the implementation

Upvotes: 3

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