的Android AlertDialog不居中/垂直縮放

我建立包含自定義視圖像這樣的AlertDialog：的Android AlertDialog不居中/垂直縮放

@Override 
protected Dialog onCreateDialog(int id) { 
    switch (id) { 
     case DIALOG_INTRO: 
      // setup the dialog 
      AlertDialog.Builder builder = new AlertDialog.Builder(this); 
      View inflatedLayout = ((LayoutInflater) getSystemService(LAYOUT_INFLATER_SERVICE)).inflate(R.layout.intro, null); 
      builder.setView(inflatedLayout); 

      // return the dialog 
      return builder.create(); 
    } 

    return super.onCreateDialog(id); 
}

而且佈局XML：

<?xml version="1.0" encoding="utf-8"?> 
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:background="#000000"> 

    <TableLayout 
     android:layout_height="match_parent" 
     android:layout_width="match_parent" 
     android:stretchColumns="2" 
     android:shrinkColumns="1"> 

     <TableRow> 
      <TextView 
       android:id="@+id/intro_TextView_title" 
       android:layout_height="wrap_content" 
       android:layout_span="2" 
       android:gravity="center" 
       android:text="@string/intro_title" 
       android:textSize="22sp" 
       android:textColor="#FFFFFF" /> 
     </TableRow> 

     <TableRow 
      android:layout_marginTop="20dip" > 
      <ImageView 
       android:layout_height="wrap_content" 
       android:layout_width="wrap_content" 
       android:layout_marginLeft="25dip" 
       android:layout_marginRight="25dip" 
       android:paddingTop="2dip" 
       android:src="@drawable/intro_add" /> 
      <TextView 
       android:id="@+id/intro_TextView_add" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginRight="20dip" 
       android:text="@string/intro_add" 
       android:textColor="#FFFFFF" /> 
     </TableRow> 

     <!-- ... --> 

    </TableLayout> 
</ScrollView>

這給了我一個對話框，長相這樣的事情（細節模糊了，不好意思）：

blurred AlertDialog screenshot