ScrollView中的Android ImageView显示白屏

Question

I want to show an image which is longer than the screen.

I'm using an ImageView inside a scroll view . I get a white screen , which is scrollable to the height of the image , but the image itself is not presented .

Here's the layout xml I'm using :-

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/scrollView1"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:fillViewport="true"
    tools:context=".MainActivity" >


    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:contentDescription="@string/test_image_content_description"
        android:adjustViewBounds="true"
        android:visibility="visible"
        android:src="@drawable/test_image" />

</ScrollView>

test_image.png is a file which is available in all the " drawable " folders of the application .

Any help would be greatly appreciated!

Answer 1

In your ScrollView ,

Change android:layout_height="wrap_content" to android:layout_height="math_parent"

Answer 2

you can add a scaletype to your imageview, like use android:scaleType="center" to center image with no scale, and then you should remove the code android:adjustViewBounds="true" from imageview. Please see ImageView.ScaleType for details. Thanks

Answer 3

Ok, I found the problem. It seems that the problem was that the image had height of 6000 pixels, and the max size Android is willing to display (even inside ScrollView) is of 4096 (even if I add scaling).

After resizing the image, it is shown without a problem.

Thank you all for the replies!