Android Studio-更改背景图片大小

Question

So, i wanted to put an image in background of my screen. My problem is that if i just add the image to "background" it will fill all the screen, and my image gets defaced. I could put as an ImageView, but the problem is that i have an expandableListView in the same screen, and i wanted the image to stay behind, as a background. Any idea how to do this? Can have 2 solutions: Put as an imagemView but behind the list. Or add as a background but resize it. How can i do it?

Here is what happened:

He is what happens if i put the image as an imageView:

Answer 1

Yes this is very easy to achieve with relative layouts

<RelativeLayout ... > 
    <ImageView ... 
            android:layout_alignParentTop="true"
            android:scaleType="centerCrop“ /> 
    <ListView ... 
            android:layout_alignParentTop="true“ /> 
</RelativeLayout>

With a relative layout z-index is decided by the order you declare the tags, so stuff towards the bottom of the xml is in front of stuff from closer to the top, when they are in the same position.

Answer 2

Use a FrameLayout (Inside FrameLayout view written on top will appear on top and so on)

<FrameLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
xmlns:android="http://schemas.android.com/apk/res/android">

<ListView
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    ></ListView>


<ImageView
    android:layout_width="your_width_in_dp"
    android:layout_height="your_height_in_dp"
    />

</FrameLayout>

You can also place FrameLayout inside another layout.