Android: onListItemClick in Activity

Question

Previous time I asked a question here I learned a lot so I guess it's worth a shot to try it again.

I am using the lazy list by Fedor from this link: Lazy load of images in ListView

It's working like a charm. BUT, Fedor is making his main class extend Activity instead of ListActivity. Because of this, I am no longer able to use a listItemClick listener. Eclipse declares some errors around onListItemClick(). It works when I turn

    @Override
protected void onListItemClick(ListView l, View v, int position, long id) {
    super.onListItemClick(l, v, position, id);
     // Intent launcher here
}

into

   protected void onListItemClick(ListView l, View v, int position, long id) {
     // Intent launcher here
   }

But the intent launcher doesn't work. Neither does a toast notification.

When I turn the Activity in a ListActivity, Eclipse doesn't stagger, but my emulator gives me a force close.

How do I get

• Either onListItemClick() click in the activity (preferable)
• Or do I transform the code into a ListActivity without force close?

Thanks a lot in advance.

Answer 1

I have been working on this all day and after making my own ArrayAdapter I couldn't figure out how to change classes in my list.

Here's how I found out how to do it. After I called my array i simply finished out my code in that method by doing.

ListView lv =getListView();
lv.setOnItemClickListener(this);

Then after all my text i put

public void onItemClick(AdapterView<?> arg0, View arg1, int position,
            long arg3) {
    String item = (String) getListAdapter().getItem(position);

    if (item.equals("Economy"))
    {
        Intent intent = new Intent(packages.this, economy.class);
        startActivity(intent);
    }
    else if (item.equals("Basic"))
    {
        Intent intent = new Intent(packages.this, basic.class);
        startActivity(intent);
    }
    else if (item.equals("Professional"))
    {
        Intent intent = new Intent(packages.this, professional.class);
        startActivity(intent);
    }
    else if (item.equals("Custom Applications"))
    {
        Intent intent = new Intent(packages.this, applications.class);
        startActivity(intent);
    }
}

Between I managed to completely customize my ListView with custom font and backgrounds. I'm sure a ton of you don't really care. But I'm exited and was hoping by posting this that I might help someone in the future.

Answer 2

I have simply added following in onCreate():

    listvview.setOnItemClickListener(new OnItemClickListener() {
        public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                long arg3) {
            setPaymentDetails();
        }
    });

Outside of onCreate() added setPaymentDetails():

protected void setPaymentDetails()
{
    Intent intent = new Intent(this, SetPaymentDetailsActivity.class);
    startActivity(intent);
}

Answer 3

Assume you have datasource Fruit contain few strings. You can define the onCreate() as following:

setListAdapter(new ArrayAdapter<String>(this, R.layout.list_fruit,
                FRUITS)); // context is this, style is list_fruit, Context, ,data_binding to FRUITs

And then write the onListItemClick() as following:

protected void onListItemClick(ListView parent, View v, int position, long id) {
                Toast.makeText(this,  " You selected  " + FRUITS[position], Toast.LENGTH_SHORT).show();
        }

I hope it works for you :)

Answer 4

If you are using ListActivity then you want to do something like this:

public class YourClass extends ListActivity implements OnItemClickListener{

    @Override
    public void onCreate(Bundle icicle){
        super.onCreate(icicle);
        setContentView(R.layout.your_layout);

        getListView().setOnItemClickListener(this);
    }

    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        // your stuff here
    }
}

This is not the only way to set an OnItemClickListener. Look other answers. This is the way I like to do it since it's clearer and easier to read.

Answer 5

FE.java

package com.example.rfe;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;
public class FE extends ListActivity {
 public List<String> d = null;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.file);
        d = new ArrayList<String>();    
        Scanner in = null;
        File f = new File("/sdcard/input.txt");
        try
        {
        in = new Scanner(new FileReader(f));
        while(in.hasNext()==true)
        {
            d.add(in.nextLine());   
        }
        }catch (FileNotFoundException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
    }
        ArrayAdapter<String> fileList =
                  new ArrayAdapter<String>(this, R.layout.row, d);
                 setListAdapter(fileList);
    }
 @Override
 protected void onListItemClick(ListView l, View v, int position, long id) 
 {
     String selection = l.getItemAtPosition(position).toString();
     Toast.makeText(this, selection, Toast.LENGTH_LONG).show();
    super.onListItemClick(l, v, position, id);
}
}

Answer 6

A listItemClickListener is attached to a ListView. When you changed ListActivity to Activity, your class no longer has a view associated with it and thus an Activity class has no idea what to do with an onListItemClickListener.

You just have to attached a listener to your ListView:

listview.setOnItemClickListener(new OnItemClickListener(){
    @Override
    protected void onListItemClick(AdapterView<?> parent, View view, int position, long id){
        //Do stuff
    }
});