Develop Reference

Perform ripple effect for long clicks

I'm currently implementing an app which has a RecyclerView in which there are several custom views. From each one of these views the user can open a context menu (which requires a long click) but it's quite hard to figure out as generally, they will just perform a simple click and then think there is nothing more to it. But if I manage to give some UI feedback it could be much clearer. The idea is a simple ripple animation that highlights the background an which wouldn't complete from a simple click but which would go all the way for a long click action.
As I have been stuck on this for two days I have done my research and actually found some SO questions asking the same thing, for example this one from Cheok Yan Cheng is very well written and he even posted a video showing the desired effect (my question is pretty much the exact same) but there are no good answers as the first one says that we should use ?attr/selectableItemBackground but the given effect is different from the one I'm aiming for and I tried the second one, it doesn't do anything for a simple click as you start the animation in onLongClick.
EDIT :
Note that the expected behavior cannot be achieved from
?attr/selectableItemBackground nor by creating a ripple xml file and then set it as the background as these will give a normal onClick animation and a different longClick animation from the desired one again, look at this video to see what the desired effect is.

Try to follow these steps, it might help:
Step1:
Create ripple.xml in drawable: (This is for Android >= v21)
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?android:colorControlHighlight">
<item android:id="#android:id/mask">
<color android:color="#android:color/transparent" />
</item>
</ripple>
In this line <color android:color="#android:color/transparent" /> will make your button transparent.
Step2:
in your item.xml where I used ConstraintLayout:
<Button
android:id="#+id/btnItemClickOnRecyclerView"
android:layout_width="0dp"
android:layout_height="0dp"
android:layout_centerInParent="true"
android:layout_marginTop="16dp"
android:background="#drawable/ripple"
android:paddingBottom="4dp"
android:text="#string/view_details"
android:textColor="#color/White"
android:textSize="14sp"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toBottomOf="parent" />
And That's it.
Since your button will be fully covering your Item and it will hover on top of other view, it will act like an item.
To implement longClick listener on the button, make sure you register it in holder and then holder.button.setOnLongClick......
Try it, If any doubts please comment.

Make a xml file named ripple.xml then set the ripple.xml as the foreground of your view. It will work like a charm!!!
<?xml version="1.0" encoding="utf-8"?>
<!-- An white rectangle ripple. -->
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:color="#3fce29"
tools:targetApi="lollipop">
<item
android:id="#android:id/mask"
android:gravity="center">
<shape android:shape="rectangle">
<solid android:color="#3fce29"/>
</shape>
</item>
</ripple>

Try this first make ripple effect xml
ripple.xml
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:color="#color/light_gray"
tools:targetApi="lollipop">
<item android:id="#android:id/mask">
<shape android:shape="rectangle">
<solid android:color="#color/light_gray"/>
</shape>
</item>
</ripple>
than your adapter decalr xml parent layout like LinearLayout or if use RelativLayout set background as below
<?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="wrap_content"
android:background="#drawable/ripple"
>......

How to Style Button

I am looking for a way to style my button like an example from an older question (How to create standard Borderless buttons (like in the design guidline mentioned)?) but some things were left out from the answer.
How can I add more than one value to an XML element, particularly android:background ="";?
I figured out how to make my buttons borderless, but I want them to have a really thin border, and a different background color. I have seen lots of tips online, but I can't find a way to put all my items together properly in code. Below is a copy pasted image with the top part representing the layout I want to achieve with the button name and a thumbnail image on the right hand side on the button with the button being a different color then the background of the app, and below that is a copy pasted image of the border style I'm trying to achieve, thin, touching borders between buttons. I have looked everywhere and tried many ideas but none seem to work properly, or some require me to have
android:background="?android:attr/selectableItemBackground"
but this interacts with
android:background="#22272D"
I need to keep the text in the button because my app is going to translate the buttons text to the language of the users phone, so I can't make the whole button just an image. Below is my XML and the output, any recommendations to how I should change it would be of massive help!
<LinearLayout
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:weightSum="6"
tools:context="com.aid.travelers.myapplication.Transportation">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/transportation_page"
android:textSize="40sp"
android:textColor="#000000"/>
<Button
android:layout_width="match_parent"
android:text="#string/airport"
android:id="#+id/AirportButton"
android:layout_height="60dp"
android:layout_weight="1"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:background="?android:attr/selectableItemBackground"/>
<Button
android:layout_width="match_parent"
android:text="#string/bicycle"
android:id="#+id/BicycleButton"
android:layout_height="60dp"
android:layout_weight="1"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"
android:background="?android:attr/selectableItemBackground"/>

I'm not sure that I get your question, but I guess you want to custom the background of your button, and have a touch effect when you press it.
Have a look at this answer :
https://stackoverflow.com/a/7176006/5446285
You should create your own resource file background.xml (for example) that you create in your drawable folder.
The code should be like :
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true"
android:drawable="#drawable/background_selected"/> <!-- pressed -->
<item android:drawable="#drawable/background_unselected" /> <!-- default -->
</selector>
You should now create 2 other files in your drawable folder : background_selected.xml, and background_unselected.xml.
To do so, I advise you something like this if you want a thin border :
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#7c7c7c" />
</shape>
</item>
<item android:bottom="2dp" android:top="2dp" android:right="2dp" android:left="2dp">
<shape android:shape="rectangle" >
<solid android:color="#a0a0a0" />
</shape>
</item>
Then you set the background of your button in your xml :
android:background="#drawable/background"

xml drawable does not works properly on Lollipop API21

EDITED
Decided to delete all of the previous question, since I made a standalone app just for solving this issue.
Problem: xml drawable does not works properly on API21, when defined as a background of a Button. and works on all other API's. Including API22 which is still Lollipop. really strange..
After making this standalone app, I realize that it might really be an API21 bug related to xml gradients. So in this app I put just a button on it in which I set the background to a drawable xml selector that changes the background drawable file depending on the state of the Button.
From what I could understand was that on API21 it only uses the start color of the gradient.
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="#dimen/activity_vertical_margin"
android:paddingLeft="#dimen/activity_horizontal_margin"
android:paddingRight="#dimen/activity_horizontal_margin"
android:paddingTop="#dimen/activity_vertical_margin"
>
<Button
android:layout_width="200dp"
android:layout_height="200dp"
android:id="#+id/imageView"
android:background="#drawable/key_pressed_selector"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
background_key_default.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient
android:startColor="#color/grey"
android:endColor="#color/grey"
/>
<corners android:radius="15dp"/>
background_yellow.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:type="radial"
android:gradientRadius="100"
android:startColor="#color/dark_blue"
android:endColor="#color/yellow"
/>
<corners android:radius="15dp"/>
</shape>
background_pressed_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/background_yellow"
android:state_pressed="true"/>
<item android:drawable="#drawable/background_key_default"/>
</selector>
res/values/colors.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="yellow">#ffff39</color>
<color name="dark_blue">#332ff2</color>
<color name="grey">#b1b2b6</color>
</resources>

Solved! To me there is a bug with this xml attribute android:gradientRadius on version API21.
The way I solved this was to create a drawable-v21 folder and copy all of my xml drawable that have this xml attribute and use one of this appendix: px (pixels), dp (density-independent pixels), sp (scaled pixels based on preferred font size), in (inches), mm (millimeters).
While leaving the default drawable folder without appendix.
otherwise I was not able to make it work, when it worked on API21 it didn't on all others API's and when it worked on all others API's it didn't on API21.
To me it worked like this.
ex:
drawable
android:gradientRadius="110"
drawable-v21
android:gradientRadius="55%p"

you do not have to override onTouch() method
simply try giving your selector xml file to the button's background.
EXAMPLE
<Button
android:id="#+id/id_Login_login_btn"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="5dp"
android:background="#drawable/your_selector_xmlfile"
android:text="Login" />

Button with background image is not shown proportionately

Here is my button image file from my drawable folder called ooo.png:
And that's how it looks like on the device:
As you can see the width height proportion changed. It's a bit wider than the original.
I need it to be looking the same though.
I don't understand what causes this stretching. Here is my xml-file:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button
android:id="#+id/button1"
style="#style/styleBtns"
android:layout_gravity="center_horizontal"
android:layout_marginTop="50dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
My styleBtns-part of the styles.xml:
<style name="styleBtns" >
<item name="android:background">#drawable/btns_abc</item>
</style>
And in my btns_abc I set the background to my image resource. Currently state pressed and the normal state are the same, I want to change that as soon as it works properly:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:drawable="#drawable/ooo" android:state_pressed="true"></item>
<item android:drawable="#drawable/ooo"></item>
</selector>
Thanks !

I don't know the exact reason but for a solution if u don't have any text for button ,use ImageView will show the same drawable u have added.

Android - Image button size

My imagebutton code wont respond to "fill_parent" and "wrap_content".
Instead, it just shows the middle of the image (because it is a pretty big image).
I tried setting specific values for the image but it still didn't work! Can somebody help me?
My button.xml in the res/drawable folder:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">\
<item android:state_pressed="true"
android:drawable="#drawable/largishbutton" /> <!-- pressed -->
<item android:state_focused="true"
android:drawable="#drawable/largerbutton2" /> <!-- focused -->
<item android:drawable="#drawable/largerbutton" /> <!-- default -->
</selector>
My main.xml in the res/layout folder:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#android:color/white">
<ImageButton
android:src="#drawable/button"
android:layout_height="fill_parent"
android:layout_width="wrap_content"
/>
</RelativeLayout>
I tried using a LinearLayout, but the app wouldnt run, and I tried replacing the imagebutton with an imageview, but then the button didn't work.

If your image is bigger than your button, you will need to use something like android:scaleType or setMaxHeight() to have it resize to fit.
Also, I recommend that you have all images in your <selector> be the same size, at least until you get things working the way you wish.