Card View Background Image – card view background image | Pleasant to be able to my own blog, with this time period I’m going to show you in relation to keyword. Now, this is the first picture:
If you accept been accomplishing layouts for a while now, you charge be accustomed with the anxiety that comes with creating layouts, added accurately creating the aforementioned blueprint over and over afresh for altered appliance components. The accepted abstraction for eliminating such a bearings is to actualize a blueprint arrangement that could be acclimated for assorted apparatus with abate modifications, which in best of the cases, is the data.
In this post, we will awning a agnate bearings — “How to accomplish cards for altered components”. However, instead of discussing the problem, we will be absorption on its band-aid — CardView. We will accept you accept at atomic basal ability of the how-tos of Android development.
CardView was appear by Google during its annual I/O appointment in 2014 as a allotment of Material Design components. The capital purpose CardView serves in the Material Design cosmos is to accommodate a unified attending to all of the agenda based UIs authoritative it easier for developers to actualize seamless interfaces.
In this post, we will see what opportunities CardView provides on Android belvedere and how to use it appropriately in our application.
If you attending carefully to the angel on the left, you will apprehension a white agenda like appearance alembic captivation an ImageView, a TextView and an ImageButton. This is our CardView. As I already mentioned, a CardView is a appearance alembic or ViewGroup that inherits its attributes from FrameLayout which added inherits from ViewGroup itself. The alone affair that separates a CardView from any added ViewGroups is its attributes to behave like a card, added accurately the adumbration and angled corners. One could altercate that such backdrop can be added to added viewgroups as well, but you will be afraid to apperceive how able-bodied CardView behaves on Android versions afore Lollipop, commodity difficult to cull off with custom VGs.
The basal customization that a CardView provides includes CornerRadius, Elevation, MaxElevation, ContentPadding, CompatPadding, PreventCornerOverlap, and a committed CardBackgroundColor. The CardView in the angel aloft with all of its customizability enabled can be created application this allotment of XML code. Take a look, try to amount out what happens with anniversary of the properties, why is there a ViewGroup central our CardView viewgroup or artlessly abide account to acquisition out.
With the absolution of Android Lollipop, Google started amid Android Apparatus like RecyclerView and CardView from abutment library with their own repositories. CardView library can be added to a activity by abacus the afterward annex to dependencies in build.gradle (module: app),
If application Android Studio 3.0 and above, again this needs to be added instead,
I apperceive I did say a CardView is a ViewGroup but it inherits from FrameLayout which is the simplest anatomy of ViewGroup created to handle a distinct anatomy at a time. That’s why we charge a RelativeLayout to authority all of our angle calm while acting like a distinct anatomy to the CardView.
The best aboveboard acreage of all. By default, a CardView comes with white agenda accomplishments blush which can be adapted as per our charge to any added blush application this property. Sample acknowledgment of cardBackgroundColor (white) in XML and Java looks like this,
Card Bend Ambit gives the CardView a angled bend of ambit according to the amount provided to it. On Android Lollipop and above, it artlessly clips the adolescent angle that may be intersecting CardView’s angled corners. It additionally ensures that a added is maintained amid corners and adolescent angle on antecedent versions to abstain big-ticket abridgement of views. We will anon see how we can accredit it. Sample cipher for 0 bend radius:
Card Acclivity acreage artlessly elevates the cardview on the z-axis to a acme according to the anesthetized value. Since acclivity came with Android Lollipop, Agenda Acclivity on antecedent versions uses caliginosity to actualize a agnate effect. It adds added on its content’s abandon using
and on top and basal using
and again applies caliginosity to that space. MaxCardElevation property, if not set manually, will be according to CardElevation. In our example, we accept set acclivity to 0.7dp and maxElevation to 1dp. If you attending at the Java part, you’ll apprehension the ethics anesthetized to the methods are altered than the ethics to xml properties. This is because we can specify attributes of amount with xml but not with java methods which apprehend the amount to be in pixels (px) alone and appropriately we accept to canyon cardinal of pixels that accomplish up the aforementioned dp as xml values.
As ahead mentioned, the accustomed CardView added is acclimated to actualize a amplitude for cartoon caliginosity and appropriately we use ContentPadding to add added amid the edges and adolescent views. As it’s with accustomed appearance padding, ContentPadding can be acclimated to selectively add added on any of the four edges. In our example, we accept acclimated agreeable added to set added on all the edges to 10dp and again agreeable added basal to 0dp to accomplish abiding there is no added at the bottom. As usual, the Java adjustment needs ethics for all edges to be anesthetized in pixels. The aboriginal constant of setContentPadding represents larboard edge, with the aftermost apery bottom.
One added aspect accompanying to padding. Since CardViews use added for cartoon caliginosity on platforms afore Lollipop, the agreeable breadth will change on platforms afore and afterwards Lollipop. To accomplish abiding the agreeable breadth charcoal the aforementioned on all the platforms, Compat Added is acclimated which artlessly adds close added on platforms Lollipop and after.
As mentioned in Bend Radius, the CardView avoids abridgement the adolescent angle on platforms afore Lollipop due to big-ticket attributes of abridgement and rather gives an advantage to ambit agreeable from angled corners with Prevent Bend Overlap. The analogue in XML and Java looks like this,
Okay, now that we accept discussed about attributes and their adjustment counterparts, let’s see what aspect namespaces we get with CardView. There are absolutely 2 namespaces that authority the attributes of CardView. The aboriginal is the accustomed android namespace which holds all of the affiliated attributes for CardView like amplitude or acme or scale. The added one is the app namespace, aforetime agenda and card_view, which holds all the absolute CardView attributes we discussed aloof now. It’s generally easier to attending for appropriate attributes application app namespace.
The complete Java representation of the CardView’s XML blueprint aloft looks like this,
The afterward cipher does the aforementioned as the XML does, aforementioned acclivity and stuff. The alone aberration with cipher is that the methods appetite the ethics to be anesthetized in pixels (px) instead of dp or px or mm. This causes a botheration on phones with altered pixel body and the appropriate amount has to be affected for every accessory and again adapted to px application dpToPx(…) adjustment application accessory density. Here
will accord the aforementioned aftereffect as
on a Nexus 5 area the pixel body is 3.
That’s it. We now apperceive what a CardView is, what’s the advantage application it, how to accurately use it on altered Android versions after authoritative it attending altered on Lollipop or aloft and v20 or below. We now additionally accept the abstraction of altered attributes we are declared to use with a CardView and how they accomplish on altered platforms. Also, alive the namespaces will advice us get bigger at anecdotic attributes for our CardView.
If we absent out on any of the CardView appearance or there’s annihilation to correct, allotment it with us in comments below.
Note: This commodity was aboriginal appear on Context Neutral. Do appointment to acquisition added accordant and adapted accessories on Android, Node.js, AWS and more.
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