从自定义 ListAdapter 创建并显示 AlertDialog

我正在实现一个自定义 ListAdapter，它使用不同的列表项布局来显示某些项目。从该自定义 ListAdapter 中，我实际上想在单击特定按钮时显示 AlertDialog。我实现了 onCreateDialog(int) 方法，并尝试使用 showDialog(int) 来显示对话框。但该对话框未显示在活动中。

这是我的自定义列表适配器文件

import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;
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 AddProblemsLayoutAdapter extends BaseAdapter {

    private Activity mContext;
    private static final int TYPE_TITLE = 0;
    private static final int TYPE_TAG = 1;
    private static final int TYPE_SOLUTION = 2;
    private static final int LAYOUT_MAX_COUNT = TYPE_SOLUTION + 1;
    private static final int ADD_TAG_DIALOG = 3378;
    private static int ITEM_COUNT = 4;
    private static Button addSolution = null, addTag = null;

private Activity mContext;
private static final int TYPE_TITLE = 0;
private static final int TYPE_TAG = 1;
private static final int TYPE_SOLUTION = 2;
private static final int LAYOUT_MAX_COUNT = TYPE_SOLUTION + 1;
private static final int ADD_TAG_DIALOG = 3378;
private static int ITEM_COUNT = 4;
private static Button addSolution = null, addTag = null;


public AddProblemsLayoutAdapter(Activity aContext) {

    mContext = aContext;
}

@Override
public int getViewTypeCount() {
    return LAYOUT_MAX_COUNT;
}

protected Dialog onCreateDialog(int id) {
    AlertDialog dialog = null;
    AlertDialog.Builder builder = new AlertDialog.Builder(mContext);
    switch (id) {
    case ADD_TAG_DIALOG:
        builder.setMessage("Are you sure you want to exit?").setCancelable(
                false).setPositiveButton("Yes",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {

                    }
                }).setNegativeButton("No",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                });

        dialog = builder.create();
        break;
    default:
        dialog = null;
    }
    dialog.setOwnerActivity(mContext);
    return dialog;
}

@Override
public int getItemViewType(int position) {
    if (position < 2)
        return TYPE_TITLE;
    else
        return position > 2 ? TYPE_SOLUTION : TYPE_TAG;
}

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    int type = getItemViewType(position);
    if (convertView == null) {
        LayoutInflater inflater = mContext.getLayoutInflater();
        switch (type) {
        case TYPE_TITLE:
            convertView = inflater.inflate(R.layout.title_row, null);
            break;

        case TYPE_TAG:
            convertView = inflater.inflate(R.layout.tag_row, null);
            break;
        case TYPE_SOLUTION:
            convertView = inflater.inflate(R.layout.solution_row, null);
            break;
        }
    }
    if (position == 0) {
        TextView titleText = (TextView) convertView
                .findViewById(R.id.titleText);
        titleText.setText(R.string.title_string);
    } else if (position == 1) {
        TextView titleText = (TextView) convertView
                .findViewById(R.id.titleText);
        titleText.setText(R.string.description_string);
    } else if (position == 2) {
        addTag = (Button) convertView.findViewById(R.id.addProblemTag);
        addTag.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                mContext.showDialog(ADD_TAG_DIALOG);
                Toast.makeText(mContext, "Add Tags", Toast.LENGTH_LONG)
                        .show();
            }
        });

    } else if (position == 3) {
        addSolution = (Button) convertView.findViewById(R.id.addSolution);
        addSolution.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                ITEM_COUNT++;
                notifyDataSetChanged();
            }
        });
    }
    return convertView;
}

@Override
public int getCount() {
    return ITEM_COUNT;
}

@Override
public Object getItem(int position) {
    // TODO Auto-generated method stub
    return null;
}

@Override
public long getItemId(int position) {
    // TODO Auto-generated method stub
    return 0;
}

}

任何人都可以给我一些关于如何在单击按钮时显示警报对话框的指示。

如果您使用上下文来调用showDialog那么你可能想要定义onCreateDialog对话框在你的Activity而不是你的适配器。