Develop Reference

Android material CardView ripple effect changes content color

I recently moved from using custom card components to material design 3 cards. To my surprise, the ripple color, when pressing on the card, changes the content color. I tried this on the catalog project of the material-design-components repository and the card behaves the same way. My current code for changing the ripple color and the card background:
<style name="Widget.App.Card.Filled" parent="Widget.Material3.CardView.Filled">
<item name="rippleColor">#4D4D4D</item>
<item name="cardBackgroundColor">#android:color/transparent</item>
</style>
I also got a demo showing this behavior: https://i.imgur.com/t4WW4CY.mp4. The font color changes to a light gray based on the ripple effect. I am also using material buttons but there the ripple effect is not affecting the content. I am using the version 1.5.0-rc01.
Does anyone have an idea if that is intended and how I can only change the background color on press using the attributes given by the material design components.
Update:
My card view XML (its the one from the material-components github + custom style):
<com.google.android.material.card.MaterialCardView
style="#style/Widget.App.Card.Filled"
android:id="#+id/card"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="0.4"
android:layout_margin="16dp"
android:clickable="true"
android:focusable="true"
app:contentPadding="#dimen/cat_card_content_padding">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="#string/cat_card_states_card_content"
android:textAppearance="?attr/textAppearanceBody1"/>
</com.google.android.material.card.MaterialCardView>

I think this is happening because of the ripple color applying to the foreground instead of background. So yeah this is intended and i don't think you can change that.
Have a look at the source code : MaterialCardViewHelper.java
Note : This does not happen in buttons bcoz buttons applies ripple to the background instead of foreground.
Source code for button : MaterialButtonHelper.java

How to make text grey in TextInputEditText after TextInputLayout enabled = false?

When I disable my TextInputLayout
InputTextContainer.isEnabled = false
it's getting grey so visually you understand that it's unavailable but text in it still black even it's blocked too. I want my text to be grey as the disabled container. Can you help me to do that?

Using the default theme, the text in a TextInputLayout's contained EditText is also grayed out when you disable a TextInputLayout. You may have done something in your theme or specific styling on your EditText that has overridden this.
For example, if you have specified a text color like this:
<com.google.android.material.textfield.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textColor="#000000"
tools:hint="Hint"
tools:text="Text" />
...you have specified a single color that cannot react to different states of the view. Here I defined black #000000, so the text will be black no matter what.
If you want a color that turns gray or transparent when it's disabled, you need to define a ColorStateList color in XML and use that as your android:textColor. Make sure the ColorStateList has at least one state that corresponds with state_enabled="false". For example:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android" >
<item
android:color="#80000000"
android:state_enabled="false"/> <!-- Translucent black for disabled state -->
<item
android:color="#FF000000"/> <!-- Default -->
</selector>

Suppose this is your xml view
<com.google.android.material.textfield.TextInputLayout
android:id="#+id/pswrd"
.....>
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/pswrd_text"
....>
</com.google.android.material.textfield.TextInputEditText>
</com.google.android.material.textfield.TextInputLayout>
you can try 2 things:
along with setting pswrd.isEnabled = false, set pswrdText.isEnabled=false as well.
in case 1 doesnt work, try pswrdText.setTextColor(android.R.color.darker_gray)

Try this method just as #Nitin Verma answered.
<com.google.android.material.textfield.TextInputEditText
android:id="#+id/edt_email">
<TextView
android:id="#+id/textView20"
android:layout_width="wrap_content"/>
<com.google.android.material.textfield.TextInputEditText/>
edt_email.isEnable = false
textView20.isEnable = false

Android how to center text of chip with fixed size?

I have a chip with 100dp of width but the text is not centered how I can center the text.
I use androidx with material library, I've tried put android:textAlignment="center" and android:gravity="center" but not work
<com.google.android.material.chip.Chip
android:id="#+id/chip"
style="#style/Widget.MaterialComponents.Chip.Choice"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="7:00" />
I have this
I want this

just now I faced with the same problem, and I solved it by set a chip property: android: textAlignment = "center". I tested your example and it works fine too, here the code that I tested:
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<com.google.android.material.chip.Chip
android:id="#+id/chip"
style="#style/Widget.MaterialComponents.Chip.Choice"
android:layout_width="100dp"
android:layout_height="wrap_content"
android:text="7:00"
android:textAlignment="center"/>
</FrameLayout>
Also make sure that you don't set or change a chip's text alignment somewhere in your code.

The short answer:
Chips aren't meant to be used the way you are trying to use them. They are supposed to wrap your content. Therefore there isn't a clean way to align the text in the center.
There is a workaround tho, you can use Chip_textEndPadding and Chip_textStartPadding attributes, which will be kinda awkward I guess.
I don't really know what you are trying to achieve, I mean, what is your why? Is it a button? Is it suppose just to show some text?
Please describe the feature, or at least, part of it.
Anyway:
According to the material design guidelines
Chips allow users to enter information, make selections, filter content, or trigger actions. Chips should appear dynamically as a group of multiple interactive elements. Unlike buttons, which should be a consistent and familiar call to action, one that a user expects to appear as the same action in the same general area.
Does your feature as anything to do with this?
In case you want a clickable, circular component you can simply use material button.
There is a similar question that was asked at github.

as others said you can use textAlignment ...but i wanted to tell you that if your using a custom font it wont be perfectly vertically aligned. you can check here for explanation.
so i would make a custom style that inherits from chip styles and set the font padding for usage like this:
<style name="customStyle" parent="#style/Widget.MaterialComponents.Chip.Choice">
<item name="chipBackgroundColor">#color/white</item>
******* <item name="android:includeFontPadding">true</item> *************
</style>
then for the text appearance you can make another style:
<style name="CustomChipTextAppearance" parent="TextAppearance.MaterialComponents.Chip">
<item name="android:fontFamily">?attr/myFont</item>
<item name="android:textAlignment">center</item>
</style>
dont forget to force a bridge theme in xml:
<com.google.android.material.chip.Chip 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"
style="#style/customStyle"
**** android:theme="#style/Theme.MaterialComponents.Bridge" ****
***** android:textAppearance="#style/CustomChipTextAppearance" *******
app:chipMinHeight="38dp"
android:layout_height="wrap_content"
android:layout_width="wrap_content"
app:chipStrokeWidth="2dp"
app:rippleColor="#android:color/transparent"
tools:chipText="my chip" />

Use isTextAlignmentResolved,
For example, chipname.isTextAlignmentResolved() to do this programmatically.

Setting backgroundTint on Material Button with alpha has a weird visual effect in normal and pressed state

I'm using Material Buttons in my project and trying to set backgroundTint with alpha value.
<!-- background_tint.xml -->
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#android:color/black" android:alpha="0.60"/>
</selector>
<!-- activity_main.xml -->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.button.MaterialButton
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:text="Sign in"
app:backgroundTint="#color/background_tint" />
</LinearLayout>
The resulting button however looks weird while in normal state and even weirder while pressed.
I don't see this issue when I set backgroundTint to specific shade of gray such as #777777. Why does this happen with alpha value?

We had the same issue with partially opaque elevated material views.
Simply adding android:stateListAnimator="#null" removed the visible shadow artifacts.
We also set the elevation to 0dp which I don't think is required.

You just need to change the style property of Material Button.
style="#style/Widget.MaterialComponents.Button.UnelevatedButton"

It's probable that you're seeing the shadow beneath. It seems like Material Design shadows are weird. It feels like the shadows are only at the sides as you're not suppose to see them anyways.
You can fix it by using an unelevated button (style="#style/Widget.MaterialComponents.Button.UnelevatedButton") or by trying to recreate that shade of gray without alpha (by maybe screenshotting the part without the shadow weirdness and using an eyedropper to get the color in RGB)
Also, it seems like you're trying to change the color of the selector.
It can be achieved by using app:rippleColor="#color/yourRippleColor". Background tint changes the color of the button itself according to the Material Components Documentation (Material Component: Button). Adjusting the alpha adjusts opacity of the color making your button more transparent/opaque enabling you to see beneath it.

Android MapView control change background color without affecting other visual properties

I have an Android application that uses a MapView with an ImageButton control (to move to the user's current location) I've added in the top right-hand corner. The problem I am having is that the ImageButton control's background is too transparent, but changing it with android:background="#BBFFFFFF" alters both the size of the background and removes the blue "flash" that you normally see when the button is pressed - two qualities I wish to retain.
I start with something like this:
<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" >
<com.google.android.maps.MapView
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/mapview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:clickable="true"
android:apiKey="my api key"
/>
<ImageButton android:id="#+id/googlemaps_select_location"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_marginTop="13dp"
android:layout_marginRight="13dp"
android:src="#drawable/device_access_location_found"/>
</RelativeLayout>
Which achieves something that looks like this:
So then I add:
android:background="#BBFFFFFF"
And I get this:
Note that although this is basically the level of opacity I want, changing the background has affected the padding, and also doesn't display a blue "flash" when pressed (which obviously isn't illustrated in this question).
So my question is, how can I change just the background color/opacity in the non-pressed state, while retaining the other visual qualities of the button? I had a brief read about Android styles and themes, but can't even figure out where this button is getting its style/theme from and how I would go about just overriding the background color/opacity while retaining all of the other visual features.

Issue
When you are assigning a fixed color to the a view background, you are replacing the default background in the view by the fixed color you define.
In reality, the background of a button is not a simple fixed color. It's a state list of color or drawables, which means, depending on button status (focous, selected, pressed, etc.) a different background is used, resulting in the "flash" animation you see when button is pressed. If you replace this state list by a simple fixed color, not depending on buttons status, you get a fixed background (i.e. not changing when button is pressed).
Resolution
There is a xml parameter that can be used to change the image view's alfa (i.e. transparency) which is:
android:alpha="1"
where the value 1 above can be any float between 0 and 1, being 1 the maximum opacy.
However, I believe this is not solving your issue, because you want to change the alfa of background not the image alfa, if I correctly understood your issue. Anyway the default seems to be 1.
One possibility the should work for you is to define a selector to be used as background. The selector will choose the drawable based on his status.
Example
<?xml version="1.0" encoding="UTF-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_pressed="true" android:drawable="#android:color/darker_gray" />
<item android:drawable="#android:color/white" />
</selector>
Save the xml file above in your drawable-xxxx folder with the name my_selector
In this example I'm using standard android colors, but you can define your own colors. You need to assigne a color for each different button status that you want to have a different color.
Then you need to define your ImageView backgroung to be the selector you defined above:
<ImageButton
android:id="#+id/googlemaps_select_location"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginRight="13dp"
android:layout_marginTop="13dp"
android:background="#drawable/my_selector"
android:src="#drawable/device_access_location_found" />
With the above changes, the bacground color used by the button will change when the button is pressed and you can have the "flash" effect.

I ended up using a style to inherit the look of Widget.ImageButton with just a few minor tweaks for my purposes:
My /res/values/styles.xml file now looks like:
<resources>
<style name="AppTheme" parent="android:Theme.Light" />
<style name="my_loc_btn_style" parent="#android:style/Widget.ImageButton">
<item name="android:layout_marginTop">8dp</item>
<item name="android:layout_marginRight">8dp</item>
</style>
</resources>
And my layout file has:
<ImageButton android:id="#+id/googlemaps_select_location"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
style="#style/my_loc_btn_style"
android:src="#drawable/device_access_location_found"/>
This seems to have inherited a background from Widget.ImageButton that seems to be just slightly transparent, which is what I was after anyway, so I don't set the transparency at all now.