java - 如何在 Android 的警报对话框中添加多项选择复选框？

Question

我在 android 应用程序中创建了菜单“同步”。当我们单击“同步”警报时，会打开一个 4 个复选框布局。我想要的是让它们发挥作用，就像我点击 15 分钟然后自动取消点击其他选项一样。

@Override
public boolean onCreateOptionsMenu(Menu menu) 
{
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.action_menu, menu);
    return true;
}       
@Override
public boolean onOptionsItemSelected(MenuItem item)
{
    switch (item.getItemId())
    {
        case R.id.menu_settings:
            alertDialog = new AlertDialog.Builder(HomePage.this).create(); //Read Update
            LayoutInflater adbInflater = this.getLayoutInflater();
            View checkboxLayout = adbInflater.inflate(R.layout.sync_layout, null);
            defaultchkbox = (CheckBox)checkboxLayout.findViewById(R.id.defaultchkbox);
            after15mint = (CheckBox)checkboxLayout.findViewById(R.id.after15mint);
            after30mint = (CheckBox)checkboxLayout.findViewById(R.id.after30mint);
            after45mint = (CheckBox)checkboxLayout.findViewById(R.id.after45mint);
            alertDialog.setView(checkboxLayout);
            alertDialog.setTitle("Synchronization");
            alertDialog.setMessage("Choose");

            alertDialog.setButton(Dialog.BUTTON_POSITIVE,"Save changes", new DialogInterface.OnClickListener()
            {
                @Override
                public void onClick(DialogInterface dialog, int which)
                {
                    // TODO Auto-generated method stub
                    boolean checkBoxResult = false; 
                        if(after15mint.isChecked())
                        {
                            Toast.makeText(getApplicationContext(), "15 Minute checked", Toast.LENGTH_LONG).show();
                            checkBoxResult = true;
                        }
                        else if(after30mint.isChecked())
                        {
                            Toast.makeText(getApplicationContext(), "30 Minute checked", Toast.LENGTH_LONG).show();
                            checkBoxResult = true;
                        }
                        else if(after45mint.isChecked())
                        {
                            Toast.makeText(getApplicationContext(), "45 Minute checked", Toast.LENGTH_LONG).show();
                            checkBoxResult = true;
                        }   
                        else{
                            Toast.makeText(getApplicationContext(),     "Default", Toast.LENGTH_LONG).show();
                        }
                }
            });
            alertDialog.setButton(Dialog.BUTTON_NEGATIVE, "Cancel", new DialogInterface.OnClickListener()
            {
                public void onClick(DialogInterface dialog, int which) 
                {
                    alertDialog.dismiss();
                }
            });
            alertDialog.show(); 
            return true;
default:
            return super.onOptionsItemSelected(item);
    }
}

但我对警报中复选框的工作有点困惑。建议会有很大帮助。谢谢你。:)

Answer 1

看起来您需要使用嵌套在 RadioGroup 中的单选按钮。然后它将只允许您一次选择一个选项。

有关 RadioGroup 的更多信息，请查看：http: //developer.android.com/reference/android/widget/RadioGroup.html

有关创建单选按钮的更多信息，请查看：

http://developer.android.com/reference/android/widget/RadioButton.html

特别是对于您的代码，您必须在 R.layout.sync_layout 的 RadioGroup 中定义 RadioButtons，例如

<RadioGroup
    android:id="@+id/syncGroup"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" >

    <RadioButton
        android:id="@+id/defualt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "Default" 
        android:checked="true" />

    <RadioButton
        android:id="@+id/minute15"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text= "15 Minute" />


     <RadioButton
         android:id="@+id/minute30"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text= "30 Minute" />


      <RadioButton
          android:id="@+id/minute45"
          android:layout_width="wrap_content"
          android:layout_height="wrap_content"
          android:text= "45 Minute" />



</RadioGroup>

Answer 2

请参阅此链接。

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
    builder.setTitle(R.string.pick_color);
           .setItems(R.array.colors_array, new DialogInterface.OnClickListener() {
               public void onClick(DialogInterface dialog, int which) {
               // The 'which' argument contains the index position
               // of the selected item
           }
    });
    return builder.create();
}