Develop Reference

How do I get a background image to scale in android studio?

So I am trying to import a custom image as the background of an android app however it does not fill in all of the edges. The option I have seen is to set a second layout to be a frame layout and then place an image view within it with additional coding along the lines of android:scaleType="centerCrop". This will not fill the entire screen up for me however, heres a screenshot of what ends up happening -
Heres the xml code being used:
<FrameLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
>
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/backgroundImage"
android:background="#drawable/backgroundImgr"
android:scaleType="centerCrop"
/>
</FrameLayout>
Another issue is that different users use different resolutions so the background image has to be able to accommodate them all without being cut off. I'm not sure how to do this.

Set ScaleType fitXY and add android:adjustViewBounds ="true"
Please use android:src="#drawable/ instead background .I hope it will helps you.

Android RTL layout direction align center issue

I'm developing an Android App that needs to be support Arabic language. (Which should be read from Right To Left). After quick googled the solutions, I figure out android fully support Arabic language natively in API level 17 with the declaration of
android:supportsRtl="true"
in the application tag inside of the AndroidManifest so that I can use the layout mirroring to automatically flip the layout for better right to left reading experience. However, I've noticed there is an issue happening while I use centerInParent in a view that inside of a sub RelativeLayout during the layout mirroring. Below are my codes and expected layout.
<RelativeLayout
android:background="#color/white"
android:layout_height="match_parent"
android:layout_width="match_parent"
android:padding="20dp">
<RelativeLayout
android:background="#drawable/shape_flag_imageview_boarder"
android:id="#+id/imageLayout"
android:layout_height="wrap_content"
android:layout_width="wrap_content">
<ImageView
android:id="#+id/image"
android:layout_height="100dp"
android:layout_width="100dp"
android:visibility="invisible" />
<ProgressBar
android:id="#+id/progressbar"
android:layout_centerInParent="true"
android:layout_height="wrap_content"
android:layout_width="wrap_content" />
</RelativeLayout>
<TextView
android:id="#+id/text"
android:layout_height="wrap_content"
android:layout_marginStart="10dp"
android:layout_marginTop="10dp"
android:layout_toEndOf="#id/imageLayout"
android:layout_width="wrap_content"
android:text="Some text here bla bla bla"
android:textColor="#color/black" />
</RelativeLayout>
Image above showing the expected result in normal layout direction which is Left to Right. The purpose I wrap the ImageView and ProgressBar together in a sub view is because I want the ProgressBar showing in the middle of the ImageView while the image is loading from the internet. After the I've changed Locale to Arabic, it becomes like
As I've try and error and figure out that this is causing by the centerInParent of the ProgressBar. It instead of centering inside the sub view, it align center to the root parent view which is the most outer RelativeLayout. Below is the screen shot of removing centerInParent code from the ProgressBar.
It clearly shows the layout mirroring works good, but the ProgressBar position is not what I'm expected. So I've try to work on centerVertical and centerHorizontal, the result are shown in images below respectively.
None of the solutions works, and none of the topic I've searched related to this issue. So I guess this might be a bug from Android library? If anyone knows the issues or solutions, please share to me. Thanks

I fixed it by adding android:layoutDirection="ltr" into the child RelativeLayout. Basically, it deactivates the RTL formatting for this particular RelativeLayout, and the android:layout_centerInParent="true" behaves correctly again. It solves our particular issue as our particular RelativeLayout contains only centred elements. But this trick should not be used if the Layout contains other elements which have to support correctly RTL, like text views for example. Hope it helps.

This is an RTL layout bug in the Android framework, which only affects Android 4.2 specifically (API 17) and when android:supportsRtl="true" is enabled in AndroidManifest.xml.
It happens when you use a RelativeLayout that contains items positioned with android:layout_centerVertical="true" or android:layout_centerInParent="true".
You can fix it in Java code like this:
View relativeLayout = layoutInflater.inflate(R.layout.my_relative_layout, parent, false);
// Fix RTL layout bug on Android 4.2 (for Arabic and Hebrew mode)
if (Build.VERSION.SDK_INT == 17 &&
getResources().getConfiguration().getLayoutDirection() == View.LAYOUT_DIRECTION_RTL) {
// Force a left-to-right layout
relativeLayout.setLayoutDirection(View.LAYOUT_DIRECTION_LTR);
}

let me tell you correct answer, look your RelativeLayout(id:imageLayout),it's width is wrap_content, and your ProgressBar(id:progressbar) add an attribute android:layout_centerInParent="true".It means parent not limit witdh,and child also want to center,so parent will be stretched.

Android view class - drawing View over button - background vs foreground?

I'm drawing an ImageView (a 50% transparent icon) over an ImageButton, but the icon disappears when I click the ImageButton (an Activity transition gets triggered at this moment). That looks pretty awful...
What is the best approach to do this, without actually putting the icon into the src-File of the ImageButton? Is there a way to do it with setting drawables as background or foreground? And what exactly are those two properties for? I can't find any documentation about android:foreground...
BTW: I'm using the new Lollipop shared element transition and testing on a nexus 9.
<Relative Layout...>
<ImageButton
android:id="#+id/imageView1"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_width="400dp"
android:layout_height="250dp"
android:src="#drawable/call1"
android:foreground="#drawable/phone" <!-- Does this make any sense?-->
android:transitionName="#string/trans_call_pic"
android:onClick="clickCall"
/>
<ImageView
android:id="#+id/imageButton1"
android:layout_width="150dp"
android:layout_height="150dp"
android:src="#drawable/phone"
android:layout_alignBottom="#id/imageView1"
android:alpha="0.5"
android:layout_marginLeft="14dp"
/>
</RelativeLayout

The android:foreground attribute is for a foreground selector (added to a FrameLayout). It's not intended to simply draw an image.
One solution would be to wrap the button & the image in a container view and put your transition on the container. This way the two child views would be treated as one.

Try adding a foreground selector to your view. You can extend ImageButton, override onDraw(), and draw the foreground selector after calling super.onDraw(). This will ensure that the foreground selector is drawn on top of the entire ImageButton. More detailed instructions can be found here.

Android Cropping Drawable from top to fit ImageView

Problem Description:
I have an ImageView which changes in size due to changing heights of different devices.
Aim:
I am looking to keep the bottom edge of the drawable in line with the bottom of the image view and crop the rest from the top.
What I've Done:
I've tried using centerCrop but it only crops from top and bottom:
<ImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/llHomeScreenButtonBar"
android:layout_alignParentTop="true"
android:scaleType="centerCrop"
android:src="#drawable/bg_home" />
I've also tried copying the Extended ImageView class from: Chris Arriola
However, I've encountered an error from eclipse saying:
Custom view CustomImageView is not using the 2- or 3-argument View constructors; XML attributes will not work
The XML code fragment looks like this:
<com.misc.CustomImageView
android:id="#+id/imageView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="#+id/llHomeScreenButtonBar"
android:layout_alignParentTop="true"
android:src="#drawable/bg_home" />
What's the best way to achieve this?
Thanks!

Implement the 2- and 3-argument constructors.
The one-argument constructor public CustomImageView(Context) can't be used by the XML inflation process.. XML inflation uses one of the other two constructors, with one or two more arguments.
see https://stackoverflow.com/a/9195858/357951

Android: Adding text below an image

I am trying to have an image be fitted, and have a layout below it with some black background and whit text. My problem is that the layout ends up leaving space between the image and the text itself, and I don't understand why:
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content" >
<ImageView
android:id="#+id/image"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scaleType="fitStart" />
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="15dp"
android:layout_below="#+id/image" >
<TextView
style="#style/text_overlay"
android:layout_width="match_parent"
android:layout_height="match_parent" />
<!-- Couple more elements -->
</RelativeLayout>
</RelativeLayout>
I would want this second RelativeLayout of 15dp touch the bottom of the image, but unless I change the image height to something small, it leaves some space. This layout specifies how to display an image + some text below it, but I have a total of 4 images that use this layout to get loaded on the screen, in a 2x2 display. (Each image takes 25% of the screen).
Any idea how to make the RelativeLayout align exactly with the bottom of the image please?

I do not fully understand your question though I think you might have a look at the launcher layout for my Newspaper Puzzles app...
http://code.google.com/p/newspaper-puzzles/source/browse/np/res/layout/launcher_layout.xml
or perhaps from the Open Sudoku Game look at the number pad layout found here:
http://code.google.com/p/newspaper-puzzles/source/browse/np/res/layout/s_im_numpad.xml
Use the ADT tools to get the right layout is probably best if possible but I know sometimes it is difficult to use to get specific results I still recommend using the xml tools included in the Android Development Tools.
http://developer.android.com/tools/help/adt.html#graphical-editor

I would recomend using a compound drawable if you're trying to put text directly below an ImageView.
See the following question for more details: How do I use a compound drawable instead of a LinearLayout that contains an ImageView and a TextView