如何使这个简单的对话框片段半透明

Question

我试图使这个简单的对话框半透明：

class TestDialog extends SherlockDialogFragment
{


    public TestDialog()
    {
    super();        
    }




    @Override
    public Dialog onCreateDialog(Bundle savedInstanceStateBundle ) 
    {

    AlertDialog.Builder builder1 = new AlertDialog.Builder(getActivity());
    // Get the layout inflater
    LayoutInflater inflater1 = getActivity().getLayoutInflater();

    // Inflate and set the layout for the dialog
    // Pass null as the parent view because its going in the dialog layout
    builder1.setView(inflater1.inflate(R.layout.dlg_test, null))
    // Add action buttons
    .setPositiveButton( "Ok", new DialogInterface.OnClickListener() 
     {

        @Override       
        public void onClick(DialogInterface dialog, int id)         
        {           
            // sign in the user ...                    
        }


     })
     .setNegativeButton( "Cancel", new DialogInterface.OnClickListener() 
      {      
                 @Override
         public void onClick(DialogInterface dialog, int id)             
         {           

         }           
      });

        return builder1.create();

    }        


}

布局如下：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/test"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/username"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:layout_marginLeft="4dp"
        android:layout_marginRight="4dp"
        android:layout_marginBottom="4dp"
        android:hint="User name" />

 </LinearLayout>

Answer 1

而不是：

return builder1.create();

试着把这个：

Dialog dialog = builder1.create();
Drawable d = new ColorDrawable(Color.BLACK);
d.setAlpha(130);
dialog.getWindow().setBackgroundDrawable(d);
return dialog;