I have a layout in which I have like button which is a simple textview and I have applied onclick event on this. Now I want to show the same effect which facebook shows when like button in facebook android app get clicked on the news feeds.
How can I do this in my android application. Please help me if you have any idea here.
Use selector if you want to give a highlight effect only when the button in touched.
Save this as an xml drawable and assign this drawable to the button :
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/btn_white_09_rectangle_unpressed" android:state_focused="true"
android:state_pressed="false" />
<item android:drawable="#drawable/btn_white_09_rectangle_pressed" android:state_focused="true"
android:state_pressed="true" />
<item android:drawable="#drawable/btn_white_09_rectangle_pressed" android:state_focused="false"
android:state_pressed="true" />
<item android:drawable="#drawable/btn_white_09_rectangle_unpressed" />
</selector>
Create 2 other drawable xml files which is being used by the above xml.
btn_white_09_rectangle_unpressed.xml:
<?xml version="1.0" encoding="utf-8"?>
<layer-list
xmlns:android="http://schemas.android.com/apk/res/android"
>
<item >
<shape
android:shape="rectangle"
>
<corners
android:radius="9dp"/>
<gradient
android:angle="45"
android:endColor="#27FFFFFF"
android:startColor="#18FFFFFF"
/>
</shape>
</item>
</layer-list>
btn_white_09_rectangle_pressed.xml:
<?xml version="1.0" encoding="utf-8"?>
<layer-list
xmlns:android="http://schemas.android.com/apk/res/android"
>
<item >
<shape
android:shape="rectangle"
>
<corners
android:radius="11dp"/>
<gradient
android:angle="90"
android:endColor="#09FFFFFF"
android:startColor="#02FFFFFF"
/>
</shape>
</item>
</layer-list>
If you want to change the background of the button(and not revert) when user clicks on it then you have to do it through code.
Use the following code in your onClick()
your_button.setBackgroundResource(R.id.desired_drawable);
I have a list where I have defined my own list view items with a custom layout. This layout has a background with a custom drawable.
My custom layout for the ListView item:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/item"
android:clickable="true"
android:focusable="true"
android:focusableInTouchMode="true" >
...
</RelativeLayout>
My custom drawable item.xml:
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- background: shadow -->
<item>
<shape
android:dither="true"
android:shape="rectangle" >
<corners android:radius="2dp" />
<solid android:color="#color/itemShadowColor" />
</shape>
</item>
<!-- foreground: surface -->
<item android:bottom="2dp">
<shape
android:dither="true"
android:shape="rectangle" >
<corners android:radius="2dp" />
<solid android:color="#color/itemBackgroundColor" />
</shape>
</item>
</layer-list>
Now this item is not clickable anymore.
Can you explain me why, and what I have to do to have the same behavior (selector with the blue background) like a button click?
Define a selector with its pressed and default states in res/drawable folder(one of the state will be your #drawable/item). Set it as the bg of your list row layout.
See similar question and answer :Selector on background color of TextView
Edit:
Best way to understand and apply something like google did is, to look into SDK and do similar things to that. For instance look at the btn_default_holo_dark drawable. It is a selector with states and yes it is a xml.
This is a selector taken from sdk (sdk\platforms\android-18\data\res\drawable\btn_default_holo_dark.xml)
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_window_focused="false" android:state_enabled="true"
android:drawable="#drawable/btn_default_normal_holo_dark" />
<item android:state_window_focused="false" android:state_enabled="false"
android:drawable="#drawable/btn_default_disabled_holo_dark" />
<item android:state_pressed="true"
android:drawable="#drawable/btn_default_pressed_holo_dark" />
<item android:state_focused="true" android:state_enabled="true"
android:drawable="#drawable/btn_default_focused_holo_dark" />
<item android:state_enabled="true"
android:drawable="#drawable/btn_default_normal_holo_dark" />
<item android:state_focused="true"
android:drawable="#drawable/btn_default_disabled_focused_holo_dark" />
<item
android:drawable="#drawable/btn_default_disabled_holo_dark" />
</selector>
These are the images taken from sdk (sdk\platforms\android-18\data\res\drawable-xhdpi):
When you apply this drawable/selector (#drawable/btn_default_holo_dark) to any view, you are going to have its states. I hope this sample makes my answer more clear.
I have a ListView item which has a set background. This overrides the default blue highlight that appears when the item is pressed/selected. Is there a way to have both the background and the selector?
This is my attempt at merging both a background and selector...
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:color="#color/red"/>
</selector>
<item>
<shape
android:dither="true"
android:shape="rectangle" >
<solid android:color="#ccc" />
</shape>
</item>
<item android:bottom="2dp">
<shape
android:dither="true"
android:shape="rectangle" >
<corners android:radius="6dp" />
<solid android:color="#android:color/white" />
</shape>
</item>
</layer-list>
This is in my drawable folder, and I set it with this in my ListItem xml:
android:background="#drawable/my_background
To have a custom background and the default selector effect (another drawalbe when pressed / selected) is a little difficult, after a few tries, I made it.
You should define two selectors in separated xml file: listitem_background.xml and listitem_selector.xml.
The first one is used to the background of the list item, it will make the effect when the item is pressed and in normal state.
The second one is used to the selector of the list, it will get rid of the default selector of the list view by setting all the state to transparent.
The default selector effect is defined in the first xml file: listitem_background.xml.
First you need a xml file to define some drawable color: color_drawable.xml, in res/values directory:
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- The color of the normal state. -->
<drawable name="listitem_normal">#E671B8</drawable>
<!-- The two color below show when the item is pressed, you should change that to the color you want. -->
<drawable name="listitem_pressed">#e7eeab</drawable>
<drawable name="listitem_selected">#e7eeab</drawable>
</resources>
Then, listitem_background.xml in res/drawable:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/listitem_pressed" android:state_enabled="true" android:state_pressed="true"/>
<item android:drawable="#drawable/listitem_selected" android:state_enabled="true" android:state_focused="true"/>
<item android:drawable="#drawable/listitem_selected" android:state_enabled="true" android:state_selected="true"/>
<item android:drawable="#drawable/listitem_normal"/>
</selector>
and, listitem_selector.xml in res/drawable:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/android:transparent" android:state_enabled="true" android:state_pressed="true"/>
<item android:drawable="#color/android:transparent" android:state_enabled="true" android:state_focused="true"/>
<item android:drawable="#color/android:transparent"/>
</selector>
set listitem_background to listitem:
<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:background="#drawable/listitem_background" >
...
</RelativeLayout>
set listitem_selector to listview:
<ListView
android:id="#+id/listView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:listSelector="#drawable/listitem_selector" />
Seeing as this is getting a bit of attention again, I will post the solution I found (which I had previously mentioned in a comment):
I found android:drawSelectorOnTop="true" in the ListView solved the problem.
Just use of this in ListView to match the color combination
android:cacheColorHint="#e7eeab"
I want to use a list selector for my gridview. I add it in xml via the android:listSelector attribute.
My selector looks like that:
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item android:state_pressed="true" android:drawable="#drawable/selected_item_highlight" />
<item android:state_focused="true" android:drawable="#drawable/selected_item_highlight" />
<item android:drawable="#android:color/transparent" />
</selector>
where the selected_item_highlight looks like that:
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners
android:radius="3dp" />
<solid
android:background="#color/ListHighlighting" />
</shape>
But the grid keeps blank. When I change the drawable attribute in the selector to drawable="#color/ListHighlighting" the whole grid - every item - get's highlighted in the color.
What's wrong?
Easy like itself . I wanna make an alpha button , which would have a selected drawable this way:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Play/Pause -->
<item android:state_selected="false" android:drawable="#drawable/item" />
<item android:state_selected="true" android:drawable="#drawable/item" />
</selector>
I would wanna make something like this:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Play/Pause -->
<item android:alpha="125" android:state_selected="false" android:drawable="#drawable/item" />
<item android:alpha="255" android:state_selected="true" android:drawable="#drawable/item" />
</selector>
Thanks for all .
It's been a while since the OP, but personally found a solution that worked a lot better for me than the suggested answers. Creating a BitmapDrawable makes is easily possible to set the alpha:
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/your_drawble"
android:alpha="77">
</bitmap>
Alpha can be any value between 0 and 255. Note that it is sort of the inverse of the HEX color value alpha, as for example 70% alpha would be B3 in HEX and 77 in the BitmapDrawable.
I achieved the same using a drawable
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<solid android:color="#5000ddff" />
</shape>
Over here used the alpha 50, which sets the opacity level.
I have been looking for the same thing. Even though this is posted over four years ago, this is the top post when googling the issue, so I'll reply here.
This is my solution
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="false">
<bitmap android:alpha="#integer/not_pressed_alpha" android:src="#drawable/item"/>
</item>
<item android:state_pressed="true" android:drawable="#drawable/item" />
</selector>
For those who have the same problem as OP, AppCompat now allows you to set 'alpha' parameter, as he wished in his target code:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Play/Pause -->
<item android:alpha="125" android:state_selected="false" android:drawable="#drawable/item" />
<item android:alpha="255" android:state_selected="true" android:drawable="#drawable/item" />
</selector>
More info here.
My goal was to make a button have it's selected and pressed states at a different alpha - but using the same (png) resource and affecting as few files as possible.
My solution is similar to altering the alpha in a BitmapDrawable - but it does it from the selector so only one file is affected.
Use the tint function of Bitmap, remember that the tint will color the existing pixels so use a white color.
Eg, #80FFFFFF - to keep color as original but reduce alpha by 50%
This could also be used to change color of the icon when pressed.
This is my drawable XML file:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true">
<bitmap
android:src="#drawable/ic_camera"
android:tint="#80FFFFFF">
</bitmap>
</item>
<item android:state_pressed="true">
<bitmap
android:src="#drawable/ic_camera"
android:tint="#80FFFFFF">
</bitmap>
</item>
<item>
<bitmap
android:src="#drawable/ic_camera">
</bitmap>
</item>
</selector>
I'm using the following for a custom radio button which should be diagonally strikethrough when it is disabled.
Example Image of 5 radio buttons where 4 of them are enabled
<item android:state_enabled="false">
<layer-list>
<item>
<shape android:shape="rectangle">
<size
android:height="35dp"
android:width="35dp"/>
<stroke
android:color="#color/someGrey"
android:width="1dp"/>
<corners android:radius="1dp"/>
</shape>
</item>
<item>
<rotate
android:fromDegrees="135"
android:pivotX="50%"
android:pivotY="50%"
android:toDegrees="135">
<shape android:shape="line">
<stroke
android:color="#color/someGrey"
android:width="1dp"/>
</shape>
</rotate>
</item>
</layer-list>
</item>
I agree with Kasium sugest, so for some Android versions the especification to Alpha is in percent.
<?xml version="1.0" encoding="utf-8"?>
<bitmap xmlns:android="http://schemas.android.com/apk/res/android"
android:src="#drawable/your_drawble"
android:alpha="0.5">
</bitmap>
i think you could create your own drawable which could take this argument as a parameter. i've never done such a thing though.
check out this link :
How to set alpha value for drawable in a StateListDrawable?
if that's not possible, you can always do it in code...
here are 2 links i've found about it, in case you wish to use bitmaps instead:
https://plus.google.com/+RomanNurik/posts/FZQcNW8G75K
https://gist.github.com/romannurik/5779875
Its not that simple but its possible:
First you have to define color in color folder of your resources like this:
color/inst_control_pressed_transp.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:alpha="0.5" android:color="?attr/inst_control_pressed" />
</selector>
Now you can reference that color from some shape:
drawable/background_clear_pressed.xml
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid
android:color="#color/inst_control_pressed_transp" />
</shape>
Tha you can use it in drawable:
drawable/background_bordered_clear_selector.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/background_clear_pressed" android:state_pressed="true" android:state_selected="false" />
<item android:drawable="#drawable/background_clear_active" android:state_activated="true" />
<item android:drawable="#drawable/background_clear_selected" android:state_selected="true" />
<item android:drawable="#drawable/background_bordered_clear_round" />
</selector>