android--对话框Dialog背景透明

先看效果：

         

这是我做的一个拨号器强的面板，拨号的时候会查询手机中的联系人，显示在拨号面板上方，点击弹出透明对话框供选择。

这次重点是透明对话框。

先看对话框的theme，style文件：

 <?xml version="1.0" encoding="utf-8"?>
 <resources>
     <style
         name="selectorDialog"
         parent="@android:style/Theme.Dialog">
         <item name="android:windowFrame">@null</item><!--边框-->
         <item name="android:windowIsFloating">true</item><!--是否浮现在activity之上-->
         <item name="android:windowIsTranslucent">false</item><!--半透明-->
         <item name="android:windowNoTitle">true</item><!--无标题-->
         <item name="android:windowBackground">@drawable/selector_dialog_bg</item><!--背景透明-->
         <item name="android:backgroundDimEnabled">false</item><!--模糊-->
         <item name="android:backgroundDimAmount">0.6</item>
     </style>
 </resources>

对话框背景@drawable/selector_dialog_bg：

 <?xml version="1.0" encoding="utf-8"?>
 <shape xmlns:android="http://schemas.android.com/apk/res/android"
     android:shape="rectangle">
     <solid android:color="#333333"/>
     <stroke
         android:width="2dp"
         android:color="#99CC33" />
     <padding
         android:left="5dp"
         android:top="5dp"
         android:right="5dp"
         android:bottom="5dp" />
     <corners android:radius="8dp" />
 </shape>

然后是对话框的布局：

 <?xml version="1.0" encoding="utf-8"?>
 <LinearLayout
     xmlns:android="http://schemas.android.com/apk/res/android"
     android:layout_width="match_parent"
     android:layout_height="wrap_content"
     android:orientation="vertical" >

     <ListView
         android:id="@+id/selector_dialog_listview"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:cacheColorHint="#00000000"
         android:scrollbars="none"
         android:dividerHeight="1.0dip"
         android:divider="#C4C4C4" />

 </LinearLayout>

程序中：

 final View view = LayoutInflater.from(this).inflate(R.layout.selector_dialog, null);
         selectorDialog = new Dialog(DialerActivity.this, R.style.selectorDialog);
         selectorDialog.setContentView(view);

         final BaseAdapter adapter = new SelectorAdapter(DialerActivity.this, selectorList);
         ListView listView = (ListView) view.findViewById(R.id.selector_dialog_listview);
         listView.setOnItemClickListener(new OnItemClickListener() {

             @Override
             public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                 //对话框中事件处理
             }

         });
         listView.setAdapter(adapter);
         selectorDialog.show();
         selectorDialog.setCanceledOnTouchOutside(true);

         WindowManager windowManager = getWindowManager();
         Display display = windowManager.getDefaultDisplay();
         WindowManager.LayoutParams lp = selectorDialog.getWindow().getAttributes();
         lp.width = (int)(display.getWidth() * 0.9);
         if(selectorList.size() > 7) {
             lp.height = (int)(display.getHeight() * 0.9);
         }
         lp.alpha = 0.8f;
         selectorDialog.getWindow().setAttributes(lp);

其实主要是通过WindowManager.LayoutParams给对话框设置属性。