LayoutInflater li = LayoutInflater.from(TagActivity. this);  //NOTE
final View TestView = li.inflate(R.layout.tag_dialog, null);

dialog = 
new Dialog(TagActivity.
this, R.style.dialog);

dialog.setContentView(TestView);

dialog.setCancelable(
true);

dialog.show();

<?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=
"match_parent"
 android:orientation=
"vertical"
>

  
<LinearLayout android:layout_height=
"wrap_content"
 android:layout_width=
"fill_parent"
>

    
<TextView android:id=
"@+id/title"
 android:layout_height=
"wrap_content"
 android:layout_width=
"fill_parent"
 android:gravity=
"center"
 android:textColor=
"@color/white"
 android:paddingTop=
"15dp"
></TextView>

  
</LinearLayout>

  
<LinearLayout android:layout_width=
"200dp"
 android:layout_height=
"200dp"
 android:orientation=
"vertical"
 android:paddingLeft=
"10dp"
 android:paddingRight=
"10dp"
 android:paddingTop=
"10dp"
>

    
<EditText android:id=
"@+id/name"
 android:layout_width=
"fill_parent"
 android:layout_height=
"wrap_content"
 android:background=
"@color/transparent"
 android:textColor=
"@color/white"
 android:hint=
"输入消息内容"
 android:textColorHint=
"@color/white"
></EditText>

  
</LinearLayout>

  
<LinearLayout android:layout_width=
"fill_parent"
 android:layout_height=
"wrap_content"
 android:orientation=
"horizontal"
 android:layout_marginBottom=
"10dp"
>

    
<RelativeLayout android:layout_width=
"fill_parent"
 android:layout_height=
"wrap_content"
 android:layout_weight=
"1"
>

      
<ImageButton android:id=
"@+id/sure"
 android:layout_width=
"wrap_content"
 android:layout_height=
"wrap_content"
 android:src=
"@drawable/sure"
 android:background=
"@drawable/btn_click_background"
 android:layout_centerHorizontal=
"true"
></ImageButton>

    
</RelativeLayout>

    
<RelativeLayout android:layout_width=
"fill_parent"
 android:layout_height=
"wrap_content"
 android:layout_weight=
"1"
>

      
<ImageButton android:id=
"@+id/cancel"
 android:layout_width=
"wrap_content"
 android:layout_height=
"wrap_content"
 android:src=
"@drawable/cancel"
 android:background=
"@drawable/btn_click_background"
 android:layout_centerHorizontal=
"true"
></ImageButton>

    
</RelativeLayout>

  
</LinearLayout>


</LinearLayout>

<!-- 下面是对话框对应的style -->


<style name=
"dialog"
 parent=
"@android:style/Theme.Dialog"
>

  
<item name=
"android:windowFrame"
>@null
</item>

  
<item name=
"android:windowIsFloating"
>true
</item>

  
<item name=
"android:windowIsTranslucent"
>true
</item>

  
<item name=
"android:windowNoTitle"
>true
</item>

  
<!--<item name="android:background">@android:color/transparent</item>-->

  
<item name=
"android:background"
>@android:color
/transparent
</item>

  
<item name=
"android:windowBackground"
>@drawable
/dialog_bg
</item>

  
<item name=
"android:backgroundDimEnabled"
>true
</item>

  
<item name=
"android:backgroundDimAmount"
>0.6
</item>

  
<item name=
"android:windowFullscreen"
>true
</item>


</style>