Toast改变背景以及度数设置

1.Toast toast = Toast.makeText(context, "Toast text", Toast.LENGTH_SHORT);?
View view = toast.getView();?
view.setBackgroundResource(/*你的背景*/);?
toast.setView(view);?
toast.show();?
2.myTextView.setText ( "78" + (char) 0x00B0 );?