如何放大图像并将其居中放置在容器底部？

Question

I'm trying to make a very simple layout with the following properties:

• Just contains a single image that should be:
  • Scaled up as much as possible while maintaining its original aspect ratio
  • Horizontally centred
  • At the bottom of its container

Here's an example of what it should look like:

I can get it to scale up and centre horizontally and vertically by setting the image to match_parent width and height and specifying scaleType of fitCentre . I could also get it to align to the bottom-right by using fitEnd .

I tried using RelativeLayout to centre it at the bottom, but I could only get this to work if I set the image's width and height to wrapContent , which caused it to not scale up.

Here's a sample layout to use as a starting point:

<?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:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_gravity="bottom|center_horizontal"
        android:scaleType="fitStart"
        android:src="@drawable/abc_ic_search" />

</RelativeLayout>

Answer 1

Try this:

<?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:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scaleType="fitCenter"
            android:src="@drawable/abc_ic_search"
            android:adjustViewBounds="true"
            android:layout_alignParentBottom="true"/>

</RelativeLayout>