Applicaton启动画面不透明度不正确

Question

activity_splash.xml

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

<ImageView
    android:id="@+id/imgLogo"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_centerInParent="true"
    android:background="@drawable/language"
    android:alpha="0.2"
    />

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentStart="true"
    android:layout_centerVertical="true"
    android:gravity="center"
    android:text="TRANSLO"
    android:textColor="#191970"
    android:textSize="40dp"/>

<ProgressBar
    android:id="@+id/progressBar"
    style="?android:attr/progressBarStyle"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    android:layout_centerHorizontal="true"
    android:layout_marginBottom="159dp" />

</RelativeLayout>

该应用程序的启动画面代码我希望图像比应用程序名称有些暗淡，但是所有内容都会变暗

This is the splash screen i am getting when i run my code which is quiet dark