android - ImageView not stretching (Android)?

Question

I have an ImageView inside a RelativeLayout. the ImageView's source is a .png file. The problem is that android is not scaling the image up or down when tested on devices with different resolutions. I read in the android documentation that android automatically scales the image up or down to fill the screen, but this is not happening. What could be the problem? I'm new to android, sorry if this question is dumb, I searched a lot but couldn't find a solution.

EDIT: The 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="fill_parent"
    android:orientation="vertical"
     >

<ImageView
        android:id="@+id/imageview1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"

        android:layout_centerInParent="true"
        android:clickable="false"
        android:scaleType="fitXY"
        android:contentDescription="@string/p"

        android:src="@drawable/example" />
</RelativeLayout>

EDIT 2: The XML layout I need to stretch:

    <?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"
    android:orientation="vertical"
    android:theme="@android:style/Theme.Black.NoTitleBar" 
    android:gravity="center">

    <ImageView
        android:id="@+id/imageView2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/imageView1"
        android:clickable="false"

        android:contentDescription="@string/p"

        android:src="@drawable/volbar" />



    <ImageView

        android:id="@+id/imageView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:clickable="false"
        android:layout_alignParentLeft="true"
        android:contentDescription="@string/p"

        android:src="@drawable/head" />

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/imageView1"
        android:layout_alignParentLeft="true"
        android:layout_marginBottom="33dp"
        android:layout_marginRight="19dp"
        android:text="@string/press_to_update" />

    <ImageView
        android:id="@+id/imageView9"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/imageView2"
        android:clickable="false"
              android:contentDescription="@string/p"

        android:src="@drawable/frag11"
         />

    <ImageView
        android:id="@+id/imageView4"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"

        android:layout_below="@+id/imageView9"
        android:clickable="false"
        android:contentDescription="@string/p"

        android:src="@drawable/base" />
    </RelativeLayout>

Answer 1

android:scaleType="fitXY"在布局中使用

编辑

如果您希望图像占据整个屏幕，请使用

    android:layout_width="match_parent"
    android:layout_height="match_parent"

Answer 2

参考这个，

**

<ImageView
                android:layout_width="wrap_content"
                android:layout_height="fill_parent"
                android:background="@drawable/ic_launcher"
                ***android:scaleType="fitXY"***
                android:layout_alignParentRight="true"
                />

**

ImageView 不会填充父级

希望这可以帮助...

Answer 3

android:layout_width="match_parent"

android:layout_height="match_parent"

 >

    android:id="@+id/imageview1"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:clickable="false"

    android:contentDescription="@string/p"

    android:background="@drawable/example" />