To make it short, this is what I would like to add a custom button that looks like this:
IMG is a .png file in my mipmap folders and SOME TEXT is just a string value. What the dashed line is added just as a separator in the image, not in the button.
The issue is that the rounded edges don't appear where the image is added. It looks like this:
My questions are the following:
Can this be achieved?
Is there a way to override the <solid /> attribute in <shape />?
I will have to create 10 of these buttons each with different colors and if I add android:color with a different value, the color does not change
When adding the image, it makes me choose only one (e.g. the mdpi one). If this will be displayed on larger screens, will it take a different .png image based on the size?
Is there a specific type of button I should use? I would like to revert the colors when the button is pressed and stay as pressed. I have a vague idea about how this can be achieved, but is there a way to do this for the .png files as well or do I need to import into the project others with the colors already inverted and just switch them?
custom_button.xml
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners
android:topLeftRadius="250px"
android:bottomLeftRadius="250px"
android:topRightRadius="50px"
android:bottomRightRadius="50px" />
<solid
android:color="#color/YellowPrimary"/>
</shape>
button_styles.xml
<resources>
<style name="CategoryToggle">
<item name="android:background">#drawable/custom_button</item>
<item name="android:textAllCaps">true</item>
</style>
<style name="CategoryToggle.First">
<item name="android:color">#color/bluePrimary</item> // Does not override <solid>
<item name="android:drawableLeft">#mipmap/icon_48mdpi</item>
<item name="android:text">#string/first_cat</item>
</style>
</resources>
button_layout.xml
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
style="#style/CategoryToggle.History"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginTop="8dp"
android:layout_marginEnd="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
I have no java code at the moment as I just started and trying to implement this weird button format.
This is how it looks at my end:
Absolutely. As I mentioned in the comments, either make sure your drawable has a transparent background, or create a custom button to mask the drawable.
You'll want to use a style attribute apply a different style to each button. By this I mean the color defined in your custom_button.xml should reference a color attribute (something like colorAccent should work in your case), instead of a static color.
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="?attr/colorAccent"/>
</shape>
Then change this color in your button styles instead of android:color.
<style name="CategoryToggle">
<item name="colorAccent">#color/YellowPrimary</item>
</style>
Make sure you have the support library dependency added, or colorAccent will not be available.
Use the android:theme attribute, instead of the style attribute to apply the button theme.
<Button
android:width="wrap_content"
android:height="wrap_content"
android:theme="#style/CategoryToggle"/>
It looks like your drawables are not using resource qualifiers. You'll need to make sure each alternative resource has the exact same name as the original (i.e. your icon_48mdpi.png should instead be called icon_48dp.png for all configurations) and is placed in the corresponding drawable folder for its density. Your drawable resources should look like the following (in the Project view structure, not the Android view structure).
res/
|-- drawable/
| +-- custom_button.xml
|-- drawable-hdpi/
| +-- icon_48dp.png
|-- drawable-mdpi/
| +-- icon_48dp.png
|-- drawable-xhdpi/
| +-- icon_48dp.png
|-- drawable-xxhdpi/
| +-- icon_48dp.png
|-- drawable-xxxhpdi/
| +-- icon_48dp.png
~
To change the color of a drawable based on state, you will need to abstract your color one step further and create a color state list.
res/color/button_color_selector.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#color/pressed_color" android:state_pressed="true"/>
<item android:color="#color/focused_color" android:state_focused="true"/>
<item android:color="#color/state_hovered" android:state_hovered="true"/>
<item android:color="?attr/colorAccent"/>
</selector>
Then you can use this color resource in your shape drawable instead of colorAccent.
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#color/button_color_selector"/>
</shape>
You can also make each of the colors in your color state list a styleable attribute by defining custom attributes and referencing those attributes in your styles. I won't go into that further for the sake of brevity though.
You can do this for drawables similarly by creating a state list drawable.
Lastly, you'll want to get into the habit of using dp instead of px unless you are absolutely certain you want to use px. This will prevent strange appearances at different screen densities.
On 4 "is there a way to (revert colors when pressed) for the .png files".. yes there are ways.
The by-the-book option is to use xml styles to specify different drawables for different button states. Consider ImageButton which has an example of this in its docs: https://developer.android.com/reference/android/widget/ImageButton.html
Another option is to apply tints or other filters to the drawable in your own code in button interaction callbacks. Compared to using different drawables, in this approach you add custom code instead of leveraging builtin resources, so you may wind up testing and debugging more on different devices, and you get full control so you can do custom animations and other elaborate things that may not fit well into Android resource tooling. Can checkout setColorFilter for starters:
https://developer.android.com/reference/android/widget/ImageView.html#setColorFilter(int,%20android.graphics.PorterDuff.Mode)
Thanks for adding some code and images or your problem, helps in understanding it.
Big shout out to Bryan for his insight on this matter. It led me to the paths I needed to follow in order to solve this issue.
I am posting this answer so that others with similar cases will know the steps. Although I have quite a number of files, this procedure did the trick perfectly.
I have my custom button as described in the link provided by Bryan.
For the rest I have the following:
Change the text color:
button_text_color.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#color/redPrimary" android:state_pressed="true"/>
<item android:color="#color/redDark"/>
</selector>
Change the background: button_background.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<shape android:shape="rectangle">
<corners android:bottomLeftRadius="400dp" android:radius="100dp" android:topLeftRadius="400dp" />
<solid android:color="#color/redDark" />
</shape>
</item>
<item android:state_enabled="true">
<shape android:shape="rectangle">
<corners android:bottomLeftRadius="400dp" android:radius="100dp" android:topLeftRadius="400dp" />
<solid android:color="#color/redPrimary" />
</shape>
</item>
</selector>
Change the drawable: button_drawable.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/ic_button_inverted" android:state_pressed="true" />
<item android:drawable="#drawable/ic_button"/>
</selector>
button_style.xml
<style name="MyButtonStyle">
<item name="android:background">#drawable/button_background</item>
<item name="android:drawableLeft">#drawable/button_drawable</item>
<item name="android:text">#string/button_text</item>
<item name="android:textColor">#color/button_text_color</item>
</style>
Implementing it in main_layout.xml
<packagename.MyCustomButton xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/myButton"
style="#style/MyBUttonStyle"
android:layout_marginBottom="8dp" />
Just use the official library.
Add the MaterialButton component using these attributes:
app:icon to add the icon
app:iconGravity to decide the position of the icon
app:iconPadding to increase/decrease the space between the icon and the text
android:paddingLeft the padding between the edge and the icon
<com.google.android.material.button.MaterialButton
android:paddingLeft="2dp"
app:icon="#drawable/ic_add_24px"
app:iconGravity="start"
app:iconPadding="4dp"
app:shapeAppearanceOverlay="#style/ShapeAppearanceOverlay.Button.RoundedRight"
.../>
With the app:shapeAppearanceOverlay you can customize the shape of the component.
<style name="ShapeAppearanceOverlay.Button.RoundedRight" parent="">
<item name="cornerFamily">rounded</item>
<item name="cornerSizeTopRight">4dp</item>
<item name="cornerSizeBottomRight">4dp</item>
<item name="cornerSizeTopLeft">16dp</item>
<item name="cornerSizeBottomLeft">16dp</item>
</style>
You can obtain the same result using a style.
Related
I am working on a project where I will have many buttons of the same size.
I was wondering if there is a way to create a standard button formatting with a set
height
weight
padding
etc.
I have looked into styles but I am not sure if that is the road I should be taking. I also thought about extending the button class and programmatically setting these values to a standard.
Hello, how are you!
The best way is to create a style in the style.xml resource, all the necessary features.
just add the style with style = "#style/mystyle" to all the buttons.
example:
<style name="mystyle">
<item name="android:textSize">20sp</item>
<item name="android:gravity">center|center_horizontal</item>
<item name="android:textAlignment">center</item>
</style>
In the same way when you want to create a customized button (java/kotlin)
it will also be added in the same way.
Greetings.
You can create a reusable component in a separate .xml file and use it everywhere since you said the dimensions exactly the same all across the app. Here is a sample:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle" >
<corners android:radius="4dp" />
<!--customize and animate stuff-->
<gradient
android:angle="270"
android:endColor="#88b823"
android:startColor="#b0dc54" />
</shape>
I have been using the new MaterialButton class. I want different colors on the button when the user clicks the button.
I have been using selector drawables for this purpose since the very beginning, however it doesn't appear to be working on MaterialButton.
<com.google.android.material.button.MaterialButton
android:layout_width="0dp"
android:text="#string/login"
style="#style/Widget.Mohre.Button"
android:layout_height="wrap_content"
app:cornerRadius="#dimen/card_corner_radius"
android:padding="#dimen/unit_large"
android:id="#+id/loginBtn"/>
My Widget.Mohre.Button style
#color/textColorWhite
#drawable/mohre_button_selector
#style/TextAppearance.Button
#animator/button_state_list_anim
My selector drawable
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/mohre_button_pressed" android:state_pressed="true" />
<item android:drawable="#drawable/mohre_button_selected" android:state_enabled="false" android:state_pressed="false" />
<item android:drawable="#drawable/mohre_button_normal" />
My individual drawables are just rectangle shapes with different colors like these
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<corners android:radius="30dp"></corners>
<solid android:color="#3a516a"></solid>
</shape>
The button doesn't take on the colors at all from the selector drawable. It just shows the default accent color of the application
With the normal way (setting the selector drawable as background of the button), it won't work as expected if you are using Theme.MaterialComponents.
You can use Theme.AppCompat.DayNight.NoActionBar as an alternative, but if you don't want to use that theme, then simply use:
<androidx.appcompat.widget.AppCompatButton
................/>
You will get the same result as it was working with the Appcompat theme even if you are using latest Material themes!
as explained in this medium post https://medium.com/over-engineering/hands-on-with-material-components-for-android-buttons-76fa1a92ec0a we can use ColorStateList to change color or background of Button.
For me working solution for now was to set backgroundTint to null and backgroundTintMode to add like this:
<style name="Button.XYZ" parent="Button">
<item name="shapeAppearance">?attr/shapeAppearanceLargeComponent</item>
<item name="drawableTint">#color/ColorXYZ</item>
<!-- background drawable -->
<item name="backgroundTint">#null</item>
<item name="backgroundTintMode">add</item>
<!-- background drawable -->
<item name="android:background">#drawable/XYZ</item>
<!-- Color drawable -->
<item name="android:textColor">#color/XYZ</item>
</style>
And also using the style in xml not in theme
If you want a button that has a custom background (to apply <selector> e.g), but your theme is set up to use Theme.MaterialComponents (which is nowadays, 2021), you could switch the XML element in the layout to be <android.widget.Button> instead of <Button>. This should cause the Material Components for Android to ignore that element, and you can manipulate this button normally with respect to XML attributes.
Short question:
Suppose I use this style on a button:
<Button
style="#style/Widget.AppCompat.Button.Borderless.Colored" ...
(or without the "Colored" part).
How do I set the background of it to be a selector that has a different color when being pressed? The default one is quite a bold color on pre-Lollipop...
I want to have all of the style working as the default (including padding), except for the color of the selector.
I think the easiest would be to create a typical multi-state drawable and replicate Android's default button drawable properties for padding, etc...
From the Android SDK AppCompat theme:
<!-- Colored bordered ink button -->
<style name="Base.Widget.AppCompat.Button.Colored">
<item name="android:background">#drawable/abc_btn_colored_material</item>
<item name="android:textAppearance">#style/TextAppearance.AppCompat.Widget.Button.Inverse</item>
</style>
They use the drawable abc_btn_colored_material, whose source is like this: https://github.com/dandar3/android-support-v7-appcompat/blob/master/res/drawable/abc_btn_borderless_material.xml
You can see it's just a layer list with the following multi-state drawable:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_focused="true" android:drawable="#drawable/abc_btn_default_mtrl_shape"/>
<item android:state_pressed="true" android:drawable="#drawable/abc_btn_default_mtrl_shape"/>
<item android:drawable="#android:color/transparent"/>
</selector>
https://github.com/dandar3/android-support-v7-appcompat/blob/master/res/drawable/abc_btn_default_mtrl_shape.xml
<inset xmlns:android="http://schemas.android.com/apk/res/android"
android:insetLeft="#dimen/abc_button_inset_horizontal_material"
android:insetTop="#dimen/abc_button_inset_vertical_material"
android:insetRight="#dimen/abc_button_inset_horizontal_material"
android:insetBottom="#dimen/abc_button_inset_vertical_material">
<shape android:shape="rectangle">
<corners android:radius="#dimen/abc_control_corner_material" />
<solid android:color="#android:color/white" />
<padding android:left="#dimen/abc_button_padding_horizontal_material"
android:top="#dimen/abc_button_padding_vertical_material"
android:right="#dimen/abc_button_padding_horizontal_material"
android:bottom="#dimen/abc_button_padding_vertical_material" />
</shape>
</inset>
So just make it yours :) Copy the drawable xml into your app and customize it.
I don't know if you will be able to access the #dimen/... from outside the SDK package, those values are defined in the SDK Values.xml, take a look at https://github.com/dandar3/android-support-v7-appcompat/blob/master/res/values/values.xml . If it's not possible, just create your own version of the dimens in your values.xml
If there's a cleaner solution any android guru can point out, I'll be glad to know!
Requested Update
Another trick is to apply a ColorFilter to the whole Button View. It's a very simple thing but not useful for all situations, as the color filter will blindly change the view as a whole (including Font color, borders, etc...). However, smartly selecting Alpha on the colors, could work for specific situations.
I'd suggest a LightningColorFilter. To apply a color filter to the Button, or to any view, you can do something like
myButton.getBackground().setColorFilter(new LightingColorFilter(Color.WHITE, Color.RED));
Check out what every color means here: http://developer.android.com/reference/android/graphics/LightingColorFilter.html
I have an ImageButton with a background image that has some transparency. By default, the button gets a grey background where the transparency pixels are - due to the Holo.Light theme. I tried setting the background color of the button to transparent via the setBackgroundColor(Color.TRANSPARENT) method. That works just fine and does what I need except now my button no longer has the light blue color when focused/pressed and looks rather flat (no borders around it, so it looks like an image).
I googled and saw that you can assign selectors as explained here but that would mean that I have to specify an image per button state and I don't want to do that. I want to inherit the focuses/pressed colors from the theme but overwrite the normal button background (when not pressed/focused) to transparent instead of grey. How can I achieve that?? Please provide a working example as I have tried many different combinations with no success.
Edit
Thank you all for helping. I figured out how to make this work without having to recreate the same image with the focused and pressed states for each button!
Here is my solution:
My button is defined as:
<ImageButton
android:id="#+id/ImageButton05"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#drawable/button" />
And my background XML file (titled button.xml) is defined as follows:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true">
<layer-list>
<item android:drawable="#drawable/btn_default_pressed_holo_light"></item>
<item android:drawable="#drawable/network_wifi"></item>
</layer-list>
</item>
<item android:state_focused="true">
<layer-list>
<item android:drawable="#drawable/btn_default_focused_holo_light"></item>
<item android:drawable="#drawable/network_wifi"></item>
</layer-list>
</item>
<item android:state_hovered="true">
<layer-list>
<item android:drawable="#drawable/btn_default_focused_holo_light"></item>
<item android:drawable="#drawable/network_wifi"></item>
</layer-list>
</item>
<item>
<layer-list>
<item android:drawable="#drawable/btn_default_normal_holo_light"></item>
<item android:drawable="#drawable/network_wifi"></item>
</layer-list>
</item>
</selector>
You can put something into an xml file, for example, custom_button.xml and then set background="#drawable/custom_button" in the button view.
Please refer to this link as there is an xml example: Standard Android Button with a different color
I used it in my code and it worked just the way I wanted.
Reference:
Standard Android Button with a different color
Edited:
If you would rather use
Maybe you should try to set a border.
For example (Reference: Android - border for button ):
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:startColor="#FFFFFF"
android:endColor="#00FF00"
android:angle="270" />
<corners android:radius="3dp" />
<stroke android:width="5px" android:color="#000000" />
</shape>
OR,
You could try to set the style/theme for the button. (But it would be in a separate file)
The style/theme contains the color attributes for various states of button such as focused / enabled / disabled/ etc.
For setting background color/image and having click highlight effect,
Here is an example (Reference: How to programmatically setting style attribute in a view)
<?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/btn_pressed" />
<item
android:state_pressed="false"
android:drawable="#drawable/btn_normal" />
</selector>
You can then apply this selector to a Button by setting the property android:background="#drawable/my_button".
I want to inherit the focuses/pressed colors from the theme but overwrite the normal button background (when not pressed/focused) to transparent instead of grey. How can I achieve that??
AFAIK you can't because the focus/pressed colors are built in to the same image resources that contain the grey background.
If you want to keep the system focus/pressed but remove the background you'll have to grab a copy of the image resources (which can be found in your SDK at /sdkroot/platforms/[version]/data/res/drawable-hdpi replace [version] with whatever api level you are after. And if needbe replace hdpi with another density) and edit out the grey button from them with a photo editor. Then make a selector that references your modified images and set that as the background for your button.
EDIT:
Here are the default holo button images for focused and pressed
You can use ImageView instead of ImageButton to solve your problem. Please set the android:background property of the ImageView to the background color of the parent.
You can write this in your xml file:
android:background="#null"
It worked for me.
if u don't need the default gray background and u need your ImageButton seems like an icon without no backgrounds just use android:background attribute and set it to
#android:color/transparent**
<ImageButton
android:id="#+id/ImageButton05"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:background="#android:color/transparent"
android:background="#drawable/button" />
hope that help anybody
I want to have 2 selectable themes for my application. In order to do that, I defined some attributes, like this:
<attr format="color" name="item_background" />
Then, I created both themes, like this:
<style name="ThemeA">
<item name="item_background">#123456</item>
</style>
<style name="ThemeB">
<item name="item_background">#ABCDEF</item>
</style>
This method works great, allowing me to create and modify several themes easily. The problem is that it seems that it can be used only in Views, and not in Drawables.
For example, referencing a value from a View inside a layout works:
<TextView android:background="?item_background" />
But doing the same in a Drawable doesn't:
<shape android:shape="rectangle">
<solid android:color="?item_background" />
</shape>
I get this error when running the application:
java.lang.UnsupportedOperationException: Can't convert to color: type=0x2
If instead of ?item_background I use a hardcoded color, it works, but that doesn't allow me to use my themes. I also tried ?attr:item_background, but the same happens.
How could I do this? And why does it work in Views but not in Drawables? I can't find this limitation anywhere in the documentation...
In my experience it is not possible to reference an attribute in an XML drawable.
In order to make your theme you need to:
Create one XML drawable per theme.
Include the needed color into you drawable directly with the #color tag or #RGB format.
Make an attribute for your drawable in attrs.xml.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<!-- Attributes must be lowercase as we want to use them for drawables -->
<attr name="my_drawable" format="reference" />
</resources>
Add your drawable to your theme.xml.
<style name="MyTheme" parent="#android:style/Theme.NoTitleBar">
<item name="my_drawable">#drawable/my_drawable</item>
</style>
Reference your drawable in your layout using your attribute.
<TextView android:background="?my_drawable" />
Starting with lollipop (API 21) this feature is supported, see
https://code.google.com/p/android/issues/detail?id=26251
However, if you're targeting devices without lollipop, don't use it, as it will crash, use the workaround in the accepted answer instead.
Although it's not possible to reference style attributes from drawables on pre-Lollipop devices, but it's possible for color state lists. You can use AppCompatResources.getColorStateList(Context context, int resId) method from Android Support Library. The downside is that you will have to set those color state lists programmatically.
Here is a very basic example.
color/my_color_state.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true" android:color="?colorControlActivated" />
<item android:color="?colorControlNormal" />
</selector>
A widget that needs a color state list:
<RadioButton
android:id="#+id/radio_button"
android:text="My Radio" />
And the most important:
ColorStateList csl = AppCompatResources.getColorStateList(context, R.color.my_color_state);
RadioButton r = (RadioButton) findViewById(R.id.radio_button);
r.setTextColor(csl);
Well, not the most elegant or shortest way, but this is what Android Support Library does to make it work on older versions (pre-Lollipop) of Android.
Unfortunately, the similar method for drawables doesn't work with style attributes.
I answered the same question in https://stackoverflow.com/a/59467269/3841352 but i will post it here as well:
I encountered the same problem and as of 2019 it hasn't been resolved so you can't have an attribute referenced in a selector as a drawable. I will share the solution I got for the problem as I don't see it posted in here. I found it in the last comment of the bug report.
The workaround is basically create a drawable resource that will be the one referring the attribute value.
To illustrate your case the solution would be instead of:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="?attr/colorPrimary" android:state_enabled="true" android:state_window_focused="false"/>
<item android:drawable="?attr/colorPrimaryDark" android:state_pressed="true"/>
<item android:drawable="#android:color/darker_gray" android:state_enabled="false"/>
<item android:drawable="?attr/colorPrimary"/>
</selector>
you would replace the ?attr/* for a drawable resource:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/colorPrimaryDrawable" android:state_enabled="true" android:state_window_focused="false"/>
<item android:drawable="#drawable/colorPrimaryDarkDrawable" android:state_pressed="true"/>
<item android:drawable="#android:color/darker_gray" android:state_enabled="false"/>
<item android:drawable="#drawable/colorPrimaryDrawable"/>
</selector>
The drawables would be defined as:
drawable/colorPrimaryDrawable
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle">
<solid android:color="?attr/colorPrimary" />
</shape>
drawable/colorPrimaryDarkDrawable
<shape xmlns:android="http://schemas.android.com/apk/res/android"android:shape="rectangle">
<solid android:color="?attr/colorPrimaryDark" />
</shape>
Hope it helps!!
As #marmor stated this is now supported on API 21. But for those us who need to support legacy versions of Android, you can use this feature. Using the v7 support library you can still use it on apps with minimum SDK level all the way down to 7.
The AppCompatImageView in the v7 Android Support Library has a bug free implementation of this feature. Simply replace your usages of ImageView with AppCompatImageView.