ListView's list to connect in another activity using intent

Question

I'm really having trouble on using ClickListener(whether OnClickListener or OnItemClickListener) for my list in connecting to another activity. I have tried inserting some code for click events in my list, but it doesn't work. It always give me errors. Below is the code for my Alphabet Activity

public class Alphabet_Activity extends Activity

{

private List<Alpha> myAlpha=new ArrayList<Alpha>();

@Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_alphabet);

    populateAlphaList();
    populateListView();
    registerClickableList();
}
//------------------------------------------------------------>
//----->for contents of my list in ListView<------------------
//------------------------------------------------------------>
    private void populateAlphaList() 
{
    myAlpha.add(new Alpha("A", R.drawable.a));
    myAlpha.add(new Alpha("B", R.drawable.b));
    myAlpha.add(new Alpha("C", R.drawable.c));
    myAlpha.add(new Alpha("D", R.drawable.d));
    myAlpha.add(new Alpha("E", R.drawable.e));
    myAlpha.add(new Alpha("F", R.drawable.f));
    myAlpha.add(new Alpha("G", R.drawable.g));
    myAlpha.add(new Alpha("H", R.drawable.h));
    myAlpha.add(new Alpha("I", R.drawable.i));
    myAlpha.add(new Alpha("J", R.drawable.j));
    myAlpha.add(new Alpha("K", R.drawable.k));
    myAlpha.add(new Alpha("L", R.drawable.l));
    myAlpha.add(new Alpha("M", R.drawable.m));
    myAlpha.add(new Alpha("N", R.drawable.n));
    myAlpha.add(new Alpha("O", R.drawable.o));
    myAlpha.add(new Alpha("P", R.drawable.p));
    myAlpha.add(new Alpha("Q", R.drawable.q));
    myAlpha.add(new Alpha("R", R.drawable.r));
    myAlpha.add(new Alpha("S", R.drawable.s));
    myAlpha.add(new Alpha("T", R.drawable.t));
    myAlpha.add(new Alpha("U", R.drawable.u));
    myAlpha.add(new Alpha("V", R.drawable.v));
    myAlpha.add(new Alpha("W", R.drawable.w));
    myAlpha.add(new Alpha("X", R.drawable.x));
    myAlpha.add(new Alpha("Y", R.drawable.y));
    myAlpha.add(new Alpha("Z", R.drawable.z));
}
//-------------------------------------------------------------------------------------->
//----->for calling the values in Alpha Activity to Alphabet Activity<------------------
//-------------------------------------------------------------------------------------->
private void populateListView()
{
    ArrayAdapter<Alpha> adapter=new MyListAdapter();
    ListView list=(ListView) findViewById(R.id.alphaListView);
    list.setAdapter(adapter);           
}   
//--------------------------------------------------------------------------->
//----->for getting message after clicking one of the list<------------------
//--------------------------------------------------------------------------->
private void registerClickableList() {
    ListView list = (ListView) findViewById(R.id.alphaListView);
    list.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View viewClicked,
                int position, long id) {

            Alpha clickedAlpha = myAlpha.get(position);
            String message = "You clicked " + position + clickedAlpha.getName();
            Toast.makeText(Alphabet_Activity.this, message, Toast.LENGTH_LONG).show();
        }
    });
}
//------------------------------------------------------------------------------>
//------>calling of values in Alpha Activity and contents in myAlpha<-----------
//------------------------------------------------------------------------------>
private class MyListAdapter extends ArrayAdapter<Alpha>
{
    public MyListAdapter()
    {
        super(Alphabet_Activity.this, R.layout.alpha, myAlpha);

    }

    @Override
    public View getView( int position, View convertView, ViewGroup parent)
    {
        View itemView=convertView;
        if(itemView==null)
        {
            itemView=getLayoutInflater().inflate(R.layout.alpha, parent,false);
        }

        //---------------------
        Alpha currentAlpha=myAlpha.get(position);

        ImageView imageView=(ImageView)itemView. findViewById(R.id.icon_Alpha);
        imageView.setImageResource(currentAlpha.geticonAlpha());


        TextView name=(TextView) itemView.findViewById(R.id.alpha_Name);
        name.setText(currentAlpha.getName());

        return itemView;
        //return super.getView(position, convertView, parent);


    }

}
 }

Here is the code for my Alpha Activity

public class Alpha {

private String Name;
private int iconAlpha;

public Alpha(String make, int iconAlpha) {
    super();
    this.Name = Name;
    this.iconAlpha = iconAlpha;
}
public String getName() {
    return Name;
}
public int geticonAlpha() {
    return iconAlpha;
}
}

Answer 1

Your code is working fine. It just have a small mistake.

In Alpha class rename String make to Name.

For calling different activities add below code in your onItemClick

switch (position) {
            case 0: 
                Intent a = new Intent(getApplicationContext(), AActivity.class);
                startActivity(a);
                break;

            case 1: 
                Intent b = new Intent(getApplicationContext(), BActivity.class);
                startActivity(b);
                break;
}

Similarly add cases as per your requirement.

or

You can create a array of string of all new activities in sequential order.

then you can get the activity name by arr[position] and call

Intent b = new Intent(getApplicationContext(), arr[pos]); startActivity(b);

Then in this case no switch case is required

Answer 2

Remove

ListView list=(ListView) findViewById(R.id.alphaListView); 

from populateListView() and registerClickableList().........................

Add it in onCreate method and then use the same object in both these functions.

Here you are creating two different objects.You need a single object