在android中更改answerd问题按钮的背景色

<Button
    android:id="@+id/answerButton"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="Answer"
    android:background="@drawable/answer_button_background" />

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_pressed="true" android:drawable="@color/button_pressed_color" />
    <item android:state_enabled="false" android:drawable="@color/button_disabled_color" />
    <item android:drawable="@color/button_default_color" />
</selector>

<resources>
    <color name="button_default_color">#FF0000</color>
    <color name="button_pressed_color">#00FF00</color>
    <color name="button_disabled_color">#808080</color>
</resources>

Button answerButton = findViewById(R.id.answerButton);
answerButton.setBackgroundResource(R.drawable.answer_button_background);