android - 在android中的MultiChoice AlertDialog中切换复选框

Question

Hi,

I have created the MultiChoice AlertDialog The AlertDialog has five list items with checkboxes. When I check First checkbox, w.r.t this the if the other checkboxes in the list are checked they shud be unchecked automatically and vice versa.

I am checking the isChecked status in the onClick method of OnMultiChoiceClickListener() and calling the showDialog(DIALOG_MULTIPLE_CHOICE); by updating boolean[] checkedItems; to recreate the Dialog, But I am unable to achieve it. If you any suggestions please direct me to right way.

有什么方法可以重新创建单选按钮单击的 AleartDialog onClick 事件。

下面是一些示例代码:

case DIALOG_MULTIPLE_CHOICE:
final String[] lJobTypes = { "Item1", "Item2", "Item3","Item4", "Item5" };
    return new AlertDialog.Builder(JoblistPage.this)
    // .setIcon(R.drawable.logo)
    .setTitle("Title Here")
    // .setCustomTitle(m_Title)
    .setMultiChoiceItems(lTypes, m_Selections,
        new DialogInterface.OnMultiChoiceClickListener() {

            public void onClick(DialogInterface dialog,int whichButton, boolean isChecked) {
                /* User clicked on a check box do some stuff */
                if (isChecked) {
                    m_CheckCount++;
                    //Toggle the Radio button Check status
                } else {
                    m_CheckCount--;
                }
                                                }
        }).setPositiveButton("Ok",
        new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog,
                    int whichButton) {
                    }
                }).create();

问候维纳亚克语

Answer 1

不要重新创建对话框，只需切换当前对话框中的复选框即可。您的 onMultiChoiceClickListener 可以跟踪当前 Activity 的复选框(如果有)并在选择另一个复选框时取消选中它。这是一个经过完整测试的工作示例:

package com.stackoverflow.beekeeper;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.DialogInterface;
import android.content.DialogInterface.OnClickListener;
import android.content.DialogInterface.OnMultiChoiceClickListener;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.Toast;

public class StackOverflowTest extends Activity {
  /** Called when the activity is first created. */
  @Override public void onCreate(final Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
  }

  private int mSelected = -1;

  @Override protected void onResume() {
    super.onResume();
    final Builder build = new Builder(this);
    build.setTitle("List selection");
    build.setCancelable(true);
    final String[] strings = new String[]{"Cow", "Horse", "Goat"};
    final OnMultiChoiceClickListener onClick =
      new OnMultiChoiceClickListener() {
        @Override public void onClick(final DialogInterface dialog,
                                      final int which, final boolean isChecked) {

          if (isChecked) {
            if ((mSelected != -1) && (mSelected != which)) {
              final int oldVal = mSelected;
              final AlertDialog alert = (AlertDialog)dialog;
              final ListView list = alert.getListView();
              list.setItemChecked(oldVal, false);
            }
            mSelected = which;
          } else
            mSelected = -1;
        }
      };
    build.setMultiChoiceItems(strings, null, onClick);
    build.setPositiveButton("Done", new OnClickListener() {
      @Override public void onClick(final DialogInterface dialog,
                                    final int which) {
        String message = null;
        if (mSelected == -1)
          message = "You didn't select anything.";
        else
          message = "You selected '" + strings[mSelected] + "'";
        Toast.makeText(StackOverflowTest.this, message, Toast.LENGTH_LONG).show();
      }
    });
    build.show();
  }
}

需要注意的一件事:您必须在“setMultiChoiceItems”调用中为“checkedItems”参数指定“null”——否则“setItemChecked”调用将无法按预期工作。它最终会使用该数组来存储选中的状态，并且“setItemChecked”不会正确更新它，所以一切都会变得困惑。奇怪，但真实。