Question

当我尝试使用ArrayAdaptor设置警报以显示一组项目，列表显示但项目的字符不可见。如果选择了该项，则字符可见。搔抓我的头脑为什么。感谢任何建议。下面是代码和来自模拟器的屏幕截图。

public class MessageTest extends Activity implements 
View.OnClickListener { 
        public final static String debugTag = "MessageDemo::"; 
        Button alert; 
        Button toast; 
        String[] items={"item1", "item2", "item3", "item4", "item5" }; 


        @Override 
        public void onCreate(Bundle icicle) { 
                super.onCreate(icicle); 


                setContentView(R.layout.message); 


                alert=(Button)findViewById(R.id.alert); 
                alert.setOnClickListener(this); 
        } 


        public void onClick(View view) { 
                if (view==alert) { 
                        ArrayAdapter<String> aa = new ArrayAdapter<String>(this, 
                                        android.R.layout.simple_list_item_single_choice, items); 


                        new AlertDialog.Builder(this) 
                                .setTitle("MessageTest") 
                                .setSingleChoiceItems(aa, 0, new DialogInterface.OnClickListener() 
{ 
                                        public void onClick(DialogInterface dlg, int which) { 
                                             Log.d(MessageDemo.debugTag, 
"DialogInterface.OnClickListener::onClick() is called -> which = 
"+which); 
                                        } 
                                }) 
                                .setIcon(android.R.drawable.ic_dialog_alert) 
                                .setPositiveButton("OK", new DialogInterface.OnClickListener() { 
                                        public void onClick(DialogInterface dlg, int sumthin) { 
                                             Log.d(MessageDemo.debugTag, "OK button is clicked -> sumthin 
= "+sumthin); 
                                        } 
                                }) 
                                .setNeutralButton("Close", new DialogInterface.OnClickListener() { 
                                        public void onClick(DialogInterface dlg, int sumthin) { 
                                             Log.d(MessageDemo.debugTag, "Close button is clicked -> 
sumthin = "+sumthin); 
                                                // do nothing -- it will close on its own 
                                        } 
                                }) 
                                .setNegativeButton("Cancel", new DialogInterface.OnClickListener() 
{ 
                                        public void onClick(DialogInterface dlg, int sumthin) { 
                                             Log.d(MessageDemo.debugTag, "Cancel button is clicked -> 
sumthin = "+sumthin); 
                                        } 
                                }) 
                                .show(); 
                } 
        }

Answer 1

我知道我回答的时间有点迟了，但我遇到了同样的问题，我只是通过改变来修复它

ArrayAdapter<String> aa = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_single_choice, items);

到

ArrayAdapter<String> aa = new ArrayAdapter<String>(this, android.R.layout.select_dialog_singlechoice, items);

我希望它有助于某人。

Answer 2

正如Quintin在评论中已经提到的，问题的原因可能是列表项的文本颜色和背景是相同的。使用另一个视图模板作为列表项，例如。 android.R.layout.select_dialog_item：

builder.setAdapter(
    new ArrayAdapter<Object>(context, android.R.layout.select_dialog_item, my_array)
    {
         @Override
         public View getView(int position, View convertView, ViewGroup parent) 
         {                         
             View row;                         
             if (null == convertView) 
             {
                 row = inflater.inflate(android.R.layout.select_dialog_item, null);
             } 
             else 
             {
                 row = convertView;
             }                          
             TextView tv = (TextView) row.findViewById(android.R.id.text1);
             tv.setText(getItem(position).toString());

             return row;                                          
         }

    }, ...

布局inflater可以在上下文中抓取：

final LayoutInflater inflater = (LayoutInflater)context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

AlertDialog不显示ListAdapter隐藏选项中的项目

2 个答案: