如何在Android的其他布局上显示半透明图像？

<LinearLayout
    ...
    android:orientation="vertical">

    <!-- 其他布局内容 -->

    <ImageView
        android:id="@+id/transparent_image"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:src="@drawable/your_transparent_image"
        android:alpha="0.5" />

</LinearLayout>

ImageView transparentImage = findViewById(R.id.transparent_image);
transparentImage.setAlpha(0.5f);