CODEWITHSUNDEEP
androidlistviewbaseadaptergetview
manjari
manjari

Reputation: 183

Get value in activity from getView of BaseAdapter

I have a listview and for that i am using a BaseAdapter. I want the value of listitem in that Activity . Below is my code

MainActivity.java

ArrayList<String> dkulist = new ArrayList<>();
CustomAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_layout);
    userList = (ListView) findViewById(R.id.userList);
    userList.setAdapter(adapter);
}

CustomAdapter.java

public class CustomAdapter extends BaseAdapter {
    @Override
    public View getView(int position, View convertView,final ViewGroup  parent) {
        if (convertView == null) {
          LayoutInflater inflater = LayoutInflater.from(parent.getContext());
          convertView = inflater.inflate(R.layout.listitem, parent, false);
    }        

    TextView Name = (TextView) convertView.findViewById(R.id.name);

    Name.setText("Dummy name");
    final boolean click_flag = false;
    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
          if(click_flag) {
             view.setBackgroundColor(Color.BLUE); // this is also not working
             // How to get this name value in my MainActivity.java
          } else {
             view.setBackgroundColor(Color.TRANSPARENT);
          }
        }
}

Thank in Adv

Upvotes: 1

Views: 2170

Answers (4)

Harsh
Harsh

Reputation: 599

Activity code:

public class MainActivity implements CustomAdapter. OnItemClickListener

ArrayList<String> dkulist = new ArrayList<>();
CustomAdapter adapter;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main_layout);
    userList = (ListView) findViewById(R.id.userList);
    userList.setAdapter(adapter);
}

@override
public void onItemClick (Object value){
// do your stuff here
}
}

Adapter code: 

public class CustomAdapter extends BaseAdapter {

private final OnItemClickListener mListener;

   public CustomAdapter(Context context){
    // this will register the listener with MainActivity.java
    mListener = (OnItemClickListener) context
   }
    @Override
    public View getView(int position, View convertView,final ViewGroup  parent) {
        if (convertView == null) {
          LayoutInflater inflater = LayoutInflater.from(parent.getContext());
          convertView = inflater.inflate(R.layout.listitem, parent, false);
    }        

    TextView Name = (TextView) convertView.findViewById(R.id.name);

    Name.setText("Dummy name");
    final boolean click_flag = false;
    convertView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
          if(click_flag) {
             view.setBackgroundColor(Color.BLUE); // this is also not working
             // How to get this name value in my MainActivity.java
             // Add below code to delegate the value to activity
             mListener.onItemClick(value);
          } else {
             view.setBackgroundColor(Color.TRANSPARENT);
          }
        }

public interface OnItemClickListener {
    void onItemClick (Object value);
}
}

Upvotes: 0

Samuel Robert
Samuel Robert

Reputation: 11062

Use an Interface to pass the value to Activity

public interface OnItemClickListener {
    void onItemClick (Object value);
}

Implement the above listener in the Activity and pass an instance of this to the adapter

private final OnItemClickListener mListener;

convertView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
         view.setBackgroundColor(Color.BLUE); // this will work now
         // This is how to get this name value in my MainActivity.java
         mListener.onItemClick(value);
    }

Upvotes: 2

Vimal Saifudin
Vimal Saifudin

Reputation: 1845

Try this

In your MainAcitivity.java,

userList.setOnItemClickListener(new ListItemClickListener());

private class ListItemClickListenerimplements ListView.OnItemClickListener {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position,
                                long id) {
            String text = ((TextView) view.findViewById(R.id.name)).getText().toString();
        }

    }

Upvotes: 0

Arun Prasad
Arun Prasad

Reputation: 360

You need to initialize instance for the Adapter and set to the userlist instead of just passing the unassigned adapter variable.

Upvotes: 0

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