问题
How do I set the selected com.google.android.material.chip.Chip color? I don't want it to be the default gray. This is a single selection chip group.
Original documentation here
<com.google.android.material.chip.ChipGroup
android:id="@+id/chipgroup"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginStart="16dp"
android:layout_marginTop="16dp"
android:layout_marginEnd="16dp"
app:checkedChip="@+id/chip_program"
app:chipSpacingHorizontal="32dp"
app:chipSpacingVertical="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="@+id/detailText"
app:singleSelection="true">
<com.google.android.material.chip.Chip
android:id="@+id/chip_program"
style="@style/Widget.MaterialComponents.Chip.Choice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Program"
app:chipEndPadding="16dp"
app:chipStartPadding="16dp" />
<com.google.android.material.chip.Chip
android:id="@+id/chip_normal"
style="@style/Widget.MaterialComponents.Chip.Choice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/program_normal"
app:chipEndPadding="16dp"
app:chipStartPadding="16dp" />
</com.google.android.material.chip.ChipGroup>
回答1:
Just set an attribute app:chipBackgroundColor and pass a color state list to it:
<android.support.design.chip.Chip
android:id="@+id/test"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checkable="true"
android:clickable="true"
android:focusable="true"
app:chipBackgroundColor="@color/bg_chip_state_list"
app:chipText="Test" />
bg_chip_state_list looks like this:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="@color/colorSecondaryLight" android:state_checked="true" />
<item android:color="@color/colorPrimaryDark" />
</selector>
However I also had to set android:clickable to true to make this work
回答2:
Using a ColorStateList is a proper way. The only thing I want to add is using custom defined style much more clear to read especially if you want to customise a bunch of properties.
Among other things, one common style applied to all views allows you to make changes in one place that apply immediately to all views
styles.xml
<style name="CustomChipChoice" parent="@style/Widget.MaterialComponents.Chip.Choice">
<item name="chipBackgroundColor">@color/background_color_chip_state_list</item>
<item name="android:textColor">@color/text_color_chip_state_list</item>
</style>
text_color_chip_state_list.xml
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_checked="true"
android:color="@color/color_checked" />
<item android:state_checked="false"
android:color="@color/color_unchecked" />
</selector>
background_color_chip_state_list.xml
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="@color/color1" android:state_checked="true" />
<item android:color="@color/color2" />
</selector>
After that all you need is apply your custom style for all the Chip views like this.
<android.support.design.chip.Chip
android:layout_width="wrap_content"
android:layout_height="match_parent"
style="@style/CustomChipChoice"
android:checkable="true"
android:clickable="true"
android:focusable="true"
android:text="Chip text" />
回答3:
To change the colors in the Chip you can use a custom style:
<com.google.android.material.chip.Chip
style="@style/My_Widget.MaterialComponents.Chip.Choice"
../>
With this style:
<style name="My_Widget.MaterialComponents.Chip.Choice" parent="Widget.MaterialComponents.Chip.Choice">
<!-- Chip background color selector -->
<item name="chipBackgroundColor">@color/my_choice_chip_background_color</item>
<!-- Border color -->
<item name="chipStrokeColor">@color/primaryDarkColor</item>
<!-- Chip text color selector -->
<item name="android:textColor">@color/mtrl_choice_chip_text_color</item>
<!-- Chip close icon color selector -->
<item name="closeIconTint">@color/mtrl_chip_close_icon_tint</item>
</style>
For the chipBackgroundColor you can use a selector like this:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 24% opacity -->
<item android:alpha="0.24" android:color="@color/custom" android:state_enabled="true" android:state_selected="true"/>
<item android:alpha="0.24" android:color="@color/secondaryDarkColor" android:state_enabled="true" android:state_checked="true"/>
<!-- 12% of 87% opacity -->
<item android:alpha="0.10" android:color="@color/primaryLightColor" android:state_enabled="true"/>
<item android:alpha="0.12" android:color="@color/colorPrimary"/>
</selector>
For the text color you can use something like:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="@color/colorAccent" android:state_enabled="true" android:state_selected="true"/>
<item android:color="?attr/colorPrimary" android:state_enabled="true" android:state_checked="true"/>
<!-- 87% opacity. -->
<item android:alpha="0.87" android:color="?attr/colorOnSurface" android:state_enabled="true"/>
<!-- 38% of 87% opacity. -->
<item android:alpha="0.33" android:color="?attr/colorOnSurface"/>
</selector>
Result for normal/selected state:
回答4:
For those using alpha-05, I found that state_checked was being ignored on the filterable (parent="Widget.MaterialComponents.Chip.Filter") Chips. Instead, you need state_selected:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="@color/apricot" android:state_selected="true"/>
<item android:color="@color/apricotSubtle"/>
</selector>
回答5:
Somehow changing android:textColor in styles doesn't work for me. I have to change the chip's text color programmatically (as I also create chips programmatically).
val chip = Chip(context)
// Apply custom MyChipChoice style to the chip
val drawable = ChipDrawable.createFromAttributes(context!!, null, 0, R.style.MyChipChoice)
chip.setChipDrawable(drawable)
// Apply text color to the chip
val colorStateList = ContextCompat.getColorStateList(context!!, R.color.my_choice_chip_text_color)
chip.setTextColor(colorStateList)
回答6:
As others mentioned, you need to set the background color property of the chip element to a ColorStateList that you define. But I just wanted to point out an important note on how to do that since I ran into issues getting the different states to work.
When defining your own ColorStateList (xml resource) you need to make sure you set the different state options in the ColorStateList BEFORE the default color! This was tripping me up for a few days before I figured it out, so I hope this helps someone else as well.
Also, your chip needs to be clickable and focusable (checkable didn't work for me) so set these properties to true as well.
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:state_selected="true"
android:color="@color/chipColorLight" />
<item android:color="@color/chipColorDefault"/>
</selector>
If you want to programmatically set different ColorStateOptions you can do that like so:
binding.myChip.chipBackgroundColor = resources.getColorStateList(R.color.chip_color_state_list)
来源：https://stackoverflow.com/questions/51089150/set-com-google-android-material-chip-chip-selected-color