如何使BaseAdapter显示AlertDialog android应用程序

Question

如何使listView中的BaseAdapter中的按钮显示alertDialog,我试过但它停止工作意外(运行时错误)我的代码如下所示.

任何建议

提前致谢

Monerah

====更新后=====================

import java.util.List;

import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

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
        AlertDialog alertDialog = new AlertDialog.Builder(MyCasesListAdapter.this);
       alertDialog.setTitle("Conformation");
       alertDialog.setMessage("Are you sure you want to do ???");
        ConfExpandRegion.setOnClickListener(new View.OnClickListener() {

            public void onClick(View v) {
                // TODO Auto-generated method stub
                    alertDialog.setButton("Yes", new DialogInterface.OnClickListener() {
                   public void onClick(DialogInterface dialog, int which) {
                      // Some code

                       //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();




        }});

       //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);
    }






}

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

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

import android.app.Activity;
import android.app.AlertDialog;
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;

public class MyPage extends Activity {

    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;
    }

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

}

Answer 1

当您在传递活动时创建适配器时,将"this"作为参数传递时,您是否100%确定？

一个好的检查方法是修改应用程序,如下所示:

将Activity参数添加到适配器

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

像这样创建警报对话框......

AlertDialog alertDialog = new AlertDialog.Builder(parentActivity);

最后,像这样调用适配器的构造函数...

MyCasesListAdapter adapter = new MyCasesListAdapter(this, listOfPhonebook, MyPage.this);   

说明:您可能不需要将Activity和Context传递给基本适配器,但我这样做只是为了让您暂时保留其他所有内容.我不确定当你实例化你的适配器时,"this"实际上是一个活动.我将构造函数中的第3个参数定义为"Activity"以强制您传入Activity.如果你尝试传入一些不是和活动的东西,你会得到编译错误,所以它应该帮助你.

此外,我刚刚注意到,但问题可能是您的更新代码仍在尝试使用MyCasesListAdapter.this创建AlertDialog作为上下文,这不是一个活动.

Answer 2

    AlertDialog.Builder alertDialogBuilder = new AlertDialog.Builder(view.getRootView().getContext());
    alertDialogBuilder.setMessage("Are you sure you want to delete?");
    alertDialogBuilder.setPositiveButton("Ok",
            new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface arg0, int arg1) {
                    deleteExp(tid);
                }
            });

    alertDialogBuilder.setNegativeButton("cancel",
            new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface arg0, int arg1) {

                }
            });

    AlertDialog alertDialog = alertDialogBuilder.create();
    alertDialog.show();