自定义具有单选列表项的对话框。

Question

我创建了一个带有单选列表项的对话框：

final CharSequence[] items = {"Red", "Green", "Blue"};

AlertDialog.Builder builder = new AlertDialog.Builder(this);
builder.setTitle("Colors");
builder.setSingleChoiceItems(items, -1, new DialogInterface.OnClickListener() {
          public void onClick(DialogInterface dialog, int item) {
                Toast.makeText(getApplicationContext(), items[item], Toast.LENGTH_SHORT).show();
            }
        });
AlertDialog alert = builder.create();
alert.show();

我该如何自定义这个对话框的布局，使得对话框中的每个列表项都包含一个图标和文本？如何为对话框上的列表创建自定义布局？

- Leem.fin

Answer 1

创建自定义对话框的步骤：

1. 创建对话框布局文件，例如：

<RelativeLayout xmlns:android = "http://schemas.android.com/apk/res/android"
android:layout_width = "wrap_content"
android:layout_height = "wrap_content">
<!-- The Title Bar -->
<LinearLayout
    android:id="@+id/dlg_priority_titlebar"
    android:orientation="horizontal"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentTop="true">

    <ImageView
        android:src="@drawable/image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_margin="5dip" />

    <TextView
        android:layout_width = "wrap_content"
            android:layout_height = "wrap_content"
            android:text = "Select Task Priority"
            android:layout_gravity = "center_vertical" />
</LinearLayout>
<ListView 
    android:id="@+id/dlg_priority_lvw"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_below="@+id/dlg_priority_titlebar"
    android:background="@drawable/layout_home_bg">
</ListView>

由于ListView中的布局是自定义的，因此需要为ListView创建一个布局文件：

<LinearLayout xmlns: android = "http://schemas.android.com/apk/res/android" 
    android:orientation = "horizontal" 
    android:layout_width = "fill_parent" 
    android:layout_height = "fill_parent"> 

<ImageView 
      android:id = "@+id/list_priority_img" 
      android:layout_width = "wrap_content" 
      android:layout_height = "wrap_content" 
      android:layout_gravity = "center_vertical" 
      android:layout_margin = "5dip" /> 
<TextView 
     android:id = "@+id/list_priority_value" 
     android:layout_width = "wrap_content" 
     android:layout_height = "wrap_content" 
     android:layout_gravity = "center_vertical" 
     android:textsize = "28dip" 
     android:textColor = "@drawable/ black" /> 
</LinearLayout>

创建一个自定义的 Dialog 类 PriorityDlg，它继承自 Dialog

     public class PriorityDlg extends Dialog {

    private Context context;
    private ListView dlg_priority_lvw = null;
    public PriorityDlg(Context context) {
        super(context);
        this.context = context;
        // TODO Auto-generated constructor stub
    }
    public PriorityDlg(Context context, int theme) {
        super(context, theme);
        this.context = context;
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        // TODO Auto-generated method stub
        super.onCreate(savedInstanceState);
        this.setContentView(R.layout.dlg_priority);
        dlg_priority_lvw = (ListView) findViewById(R.id.dlg_priority_lvw);
        // ListView
        SimpleAdapter adapter = new SimpleAdapter(context, getPriorityList(),
                R.layout.lvw_priority, new String[] { "list_priority_img",
                        "list_priority_value" }, new int[] {
                        R.id.list_priority_img, R.id.list_priority_value });
        dlg_priority_lvw.setAdapter(adapter);
        //ListView
        dlg_priority_lvw
                .setOnItemClickListener(new AdapterView.OnItemClickListener() {

                    @Override
                    public void onItemClick(AdapterView<?> arg0, View arg1,
                            int arg2, long arg3) {

                    }
                });
    }
    private List<HashMap<String, Object>> getPriorityList() {
        List<HashMap<String, Object>> priorityList = new ArrayList<HashMap<String, Object>>();
        HashMap<String, Object> map1 = new HashMap<String, Object>();
        map1.put("list_priority_img", R.drawable.priority_not_important);
        map1.put("list_priority_value", context.getResources().getString(
                R.string.dlg_priority_not_important));
        priorityList.add(map1);
        HashMap<String, Object> map2 = new HashMap<String, Object>();
        map2.put("list_priority_img", R.drawable.priority_general);
        map2.put("list_priority_value", context.getResources().getString(
                R.string.dlg_priority_general));
        priorityList.add(map2);
        HashMap<String, Object> map3 = new HashMap<String, Object>();
        map3.put("list_priority_img", R.drawable.priority_important);
        map3.put("list_priority_value", context.getResources().getString(
                R.string.dlg_priority_important));
        priorityList.add(map3);
        HashMap<String, Object> map4 = new HashMap<String, Object>();
        map4.put("list_priority_img", R.drawable.priority_very_important);
        map4.put("list_priority_value", context.getResources().getString(
                R.string.dlg_priority_very_important));
        priorityList.add(map4);

        return priorityList;
    }

}

创建自定义对话框。

PriorityDlg dlg = new PriorityDlg (SimpleTaskActivity.this, R.style.dlg_priority); 
dlg.show();

R.style.dlg_priority 设置了对话框使用的样式文件，可以让对话框去掉标题栏。当然，你也可以编写代码来实现这个效果：

<? Xml version = "1.0" encoding = "utf-8"?> 
<resources> 
    <style name="dlg_priority" parent="@android:Theme.Dialog"> 
        <item name = "android: windowNoTitle"> true </ item> 
    </ style> 
</ resources>

- ρяσѕρєя K

---

我会在这个周末试用你的代码，并告诉你结果，谢谢。 - Leem.fin

Answer 2

你需要创建自己的ListAdapter，通过继承可用的Adapter类之一并将其提供给对话框（使用builder.setAdapter(...)）。如果你有一个数组或对象列表，则可能要考虑继承ArrayAdapter。

在Adapter子类中，你需要重写getView(...)方法（以及其他方法），并为列表中提供的位置填充自定义布局的视图数据。更具体地说，你需要为ImageView设置图像，并将文本设置到TextView中。

 Create class `MySimpleArrayAdapter` extending from  `ArrayAdapter`. 

使用 ListView.setOnItemClickListener() 方法可以获取选定的 CheckTextView 的值。

#dialog.xml
<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="@color/whitebox_bg"
    android:orientation="horizontal" >

        <CheckedTextView
            android:id="@+id/textDialog"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:checkMark="?android:attr/listChoiceIndicatorSingle"
            android:gravity="center_vertical"
            android:maxLines="10"
            android:singleLine="false"
            android:text=""
            android:textAppearance="?android:attr/textAppearanceLarge"
            android:textColor="#000000" />

</LinearLayout>

创建自定义对话框

        String [] view_location = {"Red", "Green", "Blue"};
              TextView label = (TextView) findViewById(R.id.selected_dept);
              AlertDialog.Builder builder = new AlertDialog.Builder(this);
              builder.setTitle("Select Location");
              ListView listview = new ListView(this);
              listview.setLayoutParams(new LayoutParams(LayoutParams.MATCH_PARENT,
                      LayoutParams.WRAP_CONTENT));
              listview.setCacheColorHint(0);
              listview.setBackgroundColor(Color.WHITE);


              if (view_location != null) {

                  MySimpleArrayAdapter choice_arrayAdapter = new MySimpleArrayAdapter(this, view_location,label.getText().toString());
                  listview.setAdapter(choice_arrayAdapter);
                  builder.setView(listview);

                  listview.setOnItemClickListener(new OnItemClickListener() {
                      @Override
                      public void onItemClick(AdapterView<?> arg0, View arg1,
                              int arg2, long arg3) {
                          // TODO Auto-generated method stub
                          TextView label = (TextView) findViewById(R.id.selected_dept);
                          label.setText(view_location[arg2]);
                          survedObjectId = view_location_id[arg2];
                          dInterface.dismiss();

                      }
                  });


              }
              Dialog dialog = builder.create();
              dInterface = dialog;
              dialog.getWindow().setLayout(200, 400);
              dialog.show();'

    // `Extends From ArrayAdapter

     'public class MySimpleArrayAdapter extends ArrayAdapter<String> {
             private final Context context;
             private final String[] values;
             private final String  selectedText;
             public MySimpleArrayAdapter(Context context, String[] values, String  selectedText) {
               super(context, R.layout.dialog_text, values);
               this.context = context;
               this.values = values;
               this.selectedText = selectedText;
             }

             @Override
             public View getView(int position, View convertView, ViewGroup parent) {
               LayoutInflater inflater = (LayoutInflater) context
                   .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
               View rowView = inflater.inflate(R.layout.dialog_text, parent, false);
               CheckedTextView textView = (CheckedTextView) rowView.findViewById(R.id.textDialog);

               textView.setText(values[position]);
               if(textView.getText().toString().equals(selectedText))
               {
                 textView.setChecked(true);
               }
               else
               {
                 textView.setChecked(false);
               }

               return rowView;
             }
           }'

- Shankar Kamble

Answer 3

你需要创建自己的ListAdapter，通过继承可用的Adapter类之一并将其提供给对话框（使用builder.setAdapter(...)）。如果你有一个项目/对象数组或列表，那么子类化ArrayAdapter可能是你想要研究的。

在你的Adapter子类中，你需要重写getView(...)方法（以及其他方法），并使用数据填充自定义布局的视图以供列表中提供的位置。更具体地说，你需要将图像设置为ImageView并将文本设置为TextView。

一个相当不错的教程演示了如何实现自定义ArrayAdapter，并且恰好接近你想要完成的内容，可以在这里找到。它还展示了如何使用ViewHolder/RowWrapper概念。

- MH.