Calling a function from activity inside a BaseAdapter

Question

Can anyone tell me how to call function of an Activity inside a class that extends BaseAdapter?

//My activity

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.os.Bundle;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MyPage extends Activity {

    private Activity mContext;
    Button createForm;
    Button ConfExpandRegion, Cancelb;
    String ExpandMsg, CancelMsg;
    boolean b;
    MyCaseClass mycase;
    TextView tvCase;
    AlertDialog alertDialog;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.mypage);


        // Moving to anther activity
        createForm = (Button) findViewById(R.id.creat_new_formbtn);
        createForm.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {

                Intent j = new Intent(MyPage.this, CreateNewForm.class);
                startActivity(j);

            }
        });

        // ============================================================================================
        // for list


            ListView list = (ListView) findViewById(R.id.mypage_list);
            list.setClickable(true);

            final List<MyCaseClass> listOfPhonebook = new ArrayList<MyCaseClass>();

            MyCasesListAdapter adapter = new MyCasesListAdapter(this, listOfPhonebook);

            for (MyCaseClass m : All_Static.getMyCaseList())
                adapter.add(new MyCaseClass(m));

            // after fill the adapter.. assign the list to the adapter
            list.setAdapter(adapter);

            list.setOnItemClickListener(new OnItemClickListener() {

                public void onItemClick(AdapterView<?> arg0, View view, int position, long index) {
                    System.out.println("sadsfsf");
                ;
                }
            });
            list.setAdapter(adapter);
        // ========================================================================================

    }



    public void sendSMS(String number, String msg) throws Exception {
        if (!b) {
            SmsManager smsManager = SmsManager.getDefault();
            smsManager.sendTextMessage(number, null, msg, null, null);
        }
        b = true;
    }

    // ========================================================================

    public void ShowingDialog(){
        final AlertDialog alertDialog = new AlertDialog.Builder(this).create();
        alertDialog.setTitle("Conformation");
        alertDialog.setMessage("Are you sure you want to Expand Report Region?");
        alertDialog.setButton("Yes", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int which) {
                  //some codes

                    }
                   ConfExpandRegion.setEnabled(false);
               }

            });

            alertDialog.setButton2("No", new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int which) {
                // here you can add functions
                // Do nothing 




               }
            });

            alertDialog.setIcon(android.R.drawable.ic_dialog_alert);
            alertDialog.show();
    }


}

//====== my baseadapter ===========

import java.util.List;

import android.content.Context;

import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;

public class MyCasesListAdapter extends BaseAdapter {
    private Context context;

    private List<MyCaseClass> listOfCases;

    // TODO delete it not imp.
    public MyCasesListAdapter() {

        super();

    }

    public MyCasesListAdapter(Context context, List<MyCaseClass> listPhonebook) {
        this.context = context;
        this.listOfCases = listPhonebook;
    }

    public int getCount() {
        return listOfCases.size();
    }

    public Object getItem(int position) {
        return listOfCases.get(position);
    }

    public long getItemId(int position) {
        return position;
    }

    public View getView(int position, View convertView, ViewGroup viewGroup) {
        MyCaseClass entry = listOfCases.get(position);

        if (convertView == null) {

            LayoutInflater inflater = (LayoutInflater) context
                    .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            convertView = inflater.inflate(R.layout.mypage_row, null);

        }

        // this is row items..
        // Set the onClick Listener on this button
        Button ConfExpandRegion = (Button) convertView
                .findViewById(R.id.expand);
        Button Cancelb = (Button) convertView.findViewById(R.id.cancelCase);
        TextView tvCase = (TextView) convertView.findViewById(R.id.mypage_name);

        // To be a clickable button
        ConfExpandRegion.setFocusableInTouchMode(false);
        ConfExpandRegion.setFocusable(false);
        // For Dialog

        ConfExpandRegion.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub

            }
        });

        // To be a clickable button
        Cancelb.setFocusableInTouchMode(false);
        Cancelb.setFocusable(false);
        Cancelb.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                MyCaseClass entry = (MyCaseClass) v.getTag();
                listOfCases.remove(entry);
                // listPhonebook.remove(view.getId());
                notifyDataSetChanged();
            }
        });

        // Set the entry, so that you can capture which item was clicked and
        // then remove it
        // As an alternative, you can use the id/position of the item to capture
        // the item
        // that was clicked.
        ConfExpandRegion.setTag(entry);
        Cancelb.setTag(entry);

        // btnRemove.setId(position);

        return convertView;
    }

    public void onClick(View view) {
        MyCaseClass entry = (MyCaseClass) view.getTag();
        listOfCases.remove(entry);
        // listPhonebook.remove(view.getId());
        notifyDataSetChanged();

    }

    private void showDialog(MyCaseClass entry) {
        // Create and show your dialog
        // Depending on the Dialogs button clicks delete it or do nothing
    }

    public void add(MyCaseClass myCaseClass) {
        // TODO Auto-generated method stub
        listOfCases.add(myCaseClass);
    }



}

I want to call ShowingDialog in BaseaAdapter since the BaseAdapter doesn't belongs AlertDialog!!

[Same question asked twice??](http://stackoverflow.com/questions/10333730/how-to-make-baseadapter-show-alertdialog-android-application) — 5hssba, Apr 26 '12 at 15:12

score 2 · Accepted Answer · answered Apr 26 '12 at 15:12

2

Just change your:

private Context context;

to

private MyPage myPage;

Then in showDialog call

myPage.ShowingDialog();

answered Apr 26 '12 at 15:12

dbyoung

276
2
7

This is the simplest way of doing this. Make this change in your adapter and you should be fine. The Context is a reference to your activity. – Bobbake4 Apr 26 '12 at 15:24

score 0 · Answer 2 · edited Apr 04 '13 at 04:54

According to your question AlertDialog doesn't belong to BaseAdapter. Include your method (its Java not C so is not called function) in the BaseAdapter class. To use any class/method/variable from other nested classes you could put the name of the class and use this : MyCasesListAdapter.this.ShowingDialog(). However, you are calling a method that doesn't depend of any variable unless your button. Declare it public static and the use it MyCasesListAdapter.ConfExpandRegion. Also you can create a class MyDialog, for example, and implement the method there, like this:

public MyDialog(Context context, String title,  String message) {
    super(context);
    this.title = title;
    this.message = message;

}
    public void showMessage( String title, String message) {
    AlertDialog.Builder dialogBox = new AlertDialog.Builder(
            super.getContext());

    dialogBox.setTitle("Hello world");


    dialogBox.setPositiveButton("OK", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {


            dialog.cancel();


        }
    });
    dialogBox.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int which) {
            dialog.cancel();

        }
    });

    dialogBox.show();

}
}

And you can pass anything as parameter on the constructor or in the method, any Object.

Call it on your BaseAdapter

new MyDialog(title, message).showmessage(title, message);

or

Mydialog mDialog =  new new MyDialog(title, message);
mDialog.showmessage(title, message);

and if you are concerned to enter your entry object pass it as parameter of the method.

your question isn't very clear. Hope this helps anyway,

Java has functions and methods. See this answer for more details about the difference in Java: http://stackoverflow.com/a/155655/180538 — WarrenFaith, Apr 26 '12 at 16:02
@WarrenFaith: well AFAIK java doesn't have functions. check [this](http://java.sun.com/docs/white/langenv/Simple.doc2.html) in section 2.2.4 and i quote **Java has no functions. Object-oriented programming supersedes functional and procedural styles. ** — kokumajutsu, Apr 27 '12 at 10:48
Still the definition of "function" remains the same, a function uses only the data that was passed to it and nothing from the class/object it is in. Again possible terminology issues but I will go with it... — WarrenFaith, Apr 28 '12 at 08:55

score 0 · Answer 3 · answered Apr 26 '12 at 15:58

0

yes you can try context.function_name() where "context" is the context which you have passed from your activity to base adapter. You can several things like broadcast, starting activity etc from that...

answered Apr 26 '12 at 15:58

Bharat Sharma

3,926
2
17
29

Calling a function from activity inside a BaseAdapter

3 Answers3