Develop Reference

Android how to set background color on a Button

I am trying to change the background color of a Button. I'm in Kotlin on SDK 21 on emulator.
A View and a Button are declared in the layout XML file
<View
android:id="#+id/myview"
android:layout_width="64dp"
android:layout_height="32dp"
/>
<Button
android:id="#+id/showButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="12dp"
android:text="test"
/>
The API to set the color doesn't seem to work:
showButton.setBackgroundColor(0xff60a0e0.toInt()) <-- doesnt work
What works is:
myview.setBackgroundColor(0xff60a0e0.toInt()) <-- works, exact background color
showButton.setTextColor(0xff000050.toInt()) <-- works, exact text color
After trying further it seems that I can only set the alpha channel of the button, not the color:
setBackgroundColor( 0xff000000.toInt()) <-- works, opaque
setBackgroundColor( 0x00000000.toInt()) <-- works, transparent
Also same thing with:
showButton.setBackgroundColor(Color.GREEN) <-- doesnt work, button is opaque but not green
showButton.setBackgroundColor(Color.TRANSPARENT) <-- works, button is transparent
Any idea? Did I miss something in the other answers or the documentation?
Here is complete layout, it used to inflate a fragment, if that matters:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<View
android:id="#+id/myview"
android:layout_width="64dp"
android:layout_height="32dp"
/>
<Button
android:id="#+id/showButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="12dp"
android:text="test"
/>
</LinearLayout>
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/dictionaryEntryRecyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="vertical"
app:layoutManager="LinearLayoutManager"
/>
</LinearLayout>

mButton.setBackgroundColor(ContextCompat.getColor(mContext, R.color.xxx));

Since you are using a Theme.MaterialComponents.Light.DarkActionBar theme, check the doc and just use the MaterialButton with app:backgroundTint attribute:
<com.google.android.material.button.MaterialButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:backgroundTint="#color/color_selector"
android:textColor="#FFF"
android:text="BUTTON"
/>
where color_selector can be a color or a selector. Something like:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:color="#color/..." android:state_enabled="true"/>
<item android:alpha="0.12" android:color="#color/..."/>
</selector>

You can change the colour two ways; through XML or through coding. I would recommend XML since it's easier to follow for beginners.
xml
add this attribute to set background color android:background="#000"
<Button
android:id="#+id/showButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="fgkdjgdjsf"
android:background="#000"
/>
Coding:
showButton.setBackgroundColor(resources.getColor(R.color.colorPrimary))
showButton.setBackgroundColor(Color.BLACK)

In your layout, you are using
<Button
android:id="#+id/showButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="12dp"
android:text="test"
/>
if you want to set textSize in Button, you should use
android:textSize="12dp"
and for background set in button your layout should be like :-
<Button
android:id="#+id/showButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="12dp"
android:text="test"
android:background="#ff60a0e0"/>
OR You can also set color in colors.xml as :-
<color name="button_background">#ff60a0e0</color>
and then your button tag in your layout will be as
<Button
android:id="#+id/showButton"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="12dp"
android:text="test"
android:background="#color/button_background"/>
Dynamic you can set color as
showButton.setBackgroundColor(ContextCompat.getColor(context!!, R.color.button_background))

now in kotlin(androidx) you can use this,
<androidx.appcompat.widget.AppCompatButton
android:id="#+id/buttonExploreAll"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textAllCaps="false"
android:background="#drawable/select_yellow"
android:text="button"
android:textColor="#color/white"
/>
and select_yellow is your style xml.
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<stroke
android:color="#color/colorYellow"
android:width="#dimen/_1sdp"/>
<corners
android:radius="#dimen/_200sdp" />
<solid android:color="#color/colorYellow" />
</shape>

I used the "backgroundTint" to change the color, which did not allow the color to change after clicking. The problem was solved when I changed the color by "background" the button.

How can I remove shadow of Button on Dialog? Why is the shadow shown?

I created a dialog and there is a button.
I want different style of button. So I made this file and applied to the background attribute of the button.
<?xml version="1.0" encoding="utf-8"?>
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="#color/my_pink_color">
<item
android:id="#android:id/background"
android:drawable="#drawable/btn_line_border_dialogue"></item>
</ripple>
I don't know why it has shadow around the button. It has two buttons. And the second button doesn't have any thing. When I remove the second button, the shadow seems gone.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:gravity="center_horizontal"
android:orientation="vertical">
<Button
android:id="#+id/btn_close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="15dp"
android:clickable="true"
android:background="#drawable/btn_ripple"
android:text="Close"
android:textAllCaps="false"
android:textColor="#color/my_text_color"
android:textSize="17sp"
android:textStyle="bold" />
<Button
android:id="#+id/btn_close2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/btn_ripple"
android:clickable="true"
android:text="Don't show this in 24hours"
android:textAllCaps="false"
android:textColor="#color/my_text_color"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
When I just apply btn_line_border_dialogue.xml without the ripple. It is the same.
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#color/my_yellow" />
<stroke
android:width="1dp"
android:color="#color/my_pink" />
</shape>
How can I remove this effect?

Use style="?android:attr/borderlessButtonStyle" inside your Button
refer : https://developer.android.com/guide/topics/ui/controls/button.html#Borderless
Or If you don't need Button particularly, use TextView instead

try to set elevation t0 0 dp or you can use TextView or Layout instead of button.
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true"
android:gravity="center_horizontal"
android:orientation="vertical">
<TextView
android:id="#+id/btn_close"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginBottom="15dp"
android:clickable="true"
android:background="#drawable/btn_ripple"
android:text="Close"
android:textAllCaps="false"
android:textColor="#color/my_text_color"
android:textSize="17sp"
android:textStyle="bold" />
<TextView
android:id="#+id/btn_close2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/btn_ripple"
android:clickable="true"
android:text="Don't show this in 24hours"
android:textAllCaps="false"
android:textColor="#color/my_text_color"
android:textSize="14sp"
android:textStyle="bold" />
</LinearLayout>
This can be also fixed by setting android:stateListAnimator="#null" globally in Resources\values\styles.xml:
<?xml version="1.0" encoding="UTF-8"?>
<resources>
<style name="AppTheme" parent="AppTheme.Base">
</style>
<style name="AppTheme.Base" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:buttonStyle">#style/NoShadowButton</item>
</style>
<style name="NoShadowButton" parent="android:style/Widget.Button">
<item name="android:stateListAnimator">#null</item>
</style>
</resources>

set the stateListAnimator on the button as = "#null" in the xml. It will remove the shadow from the button.

Parent Relative Layout Foreground Color affecting Textview Color

I need relative layout background with some transparent for that i used gradient option, But it is affecting text view color also , I gave color of text view is white color but it looks like gray color. Please help me to get out of this issue.
<RelativeLayout
android:id="#+id/topLayout1"
android:layout_width="match_parent"
android:layout_height="210dp"
android:layout_alignParentTop="true"
android:foreground="#drawable/image_overlay"
>
<RelativeLayout
android:id="#+id/topLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#drawable/preloader_image"
>
<TextView
android:id="#+id/resName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dp"
android:text="Green Way"
android:textColor="#color/White"
android:textSize="25sp"
android:backgroundTint="#color/White"
/>
<TextView
android:id="#+id/desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/resName"
android:layout_centerHorizontal="true"
android:layout_marginTop="5dp"
android:text="#string/items"
android:textColor="#color/White"
android:textSize="16sp"
/>
</RelativeLayout>
</RelativeLayout>
and image overlay code,
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:startColor="#B0000000"
android:centerColor="#A0000000"
android:endColor="#00FFFFFF"
android:angle="270"
/>
</shape>
<color name="White">#FFFFFF</color>

You can use #83000000 color code for setting transparency and that too in android:background instead of android:background property. Alternatively, you can also use "android:aplha="0.x" where 1 < x < 9, for transparency. Your final code will look like this.
<RelativeLayout android:id="#+id/topLayout1"
android:layout_width="match_parent"
android:layout_height="210dp"
android:layout_alignParentTop="true"
android:background="#83000000"
xmlns:android="http://schemas.android.com/apk/res/android">
<RelativeLayout
android:id="#+id/topLayout"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/resName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="100dp"
android:text="Green Way"
android:textColor="#FFFFFF"
android:textSize="25sp"
android:backgroundTint="#FFFFFF" />
<TextView
android:id="#+id/desc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/resName"
android:layout_centerHorizontal="true"
android:layout_marginTop="5dp"
android:text="Items"
android:textColor="#FFFFFF"
android:textSize="16sp" />
</RelativeLayout>
You should see this ANSWER to know more about transparency. You can use various hex codes to achieve different level of transparency. Like for 50% transparency 80 code is used and color code would be like #80000000. Similary, you can use various codes in the scheme #xx000000.

Android selector only working on first element

I am having a problem with my selector, I have 3 ImageView's in a LinearLayout all having the same selector as background, I have implemented onTouchListeners for all 3 ImageView's, but the selector only works on the first ImageView but not on the others... can someone give me a hint what is wrong here?
Selector:
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#color/theme_color_green_dark" android:state_pressed="true" />
<item android:drawable="#color/theme_color_green" />
</selector>
Layout:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_captcha_actions"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:orientation="horizontal"
android:weightSum="100">
<ImageView
android:id="#+id/fragment_captcha_action_stop"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="33"
android:background="#drawable/selector_captcha_actions"
android:clickable="true"
android:src="#drawable/ic_stop"
android:tint="#android:color/white" />
<ImageView
android:id="#+id/fragment_captcha_action_skip"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="34"
android:background="#drawable/selector_captcha_actions"
android:src="#android:drawable/ic_media_ff" />
<ImageView
android:id="#+id/fragment_captcha_action_submit"
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="33"
android:background="#drawable/selector_captcha_actions"
android:src="#android:drawable/ic_media_play" />

found the problem myself...
android:clickable="true"
was only set on the first element therefore the selector worked only on the first element

Android RelativeLayout Drawable Selector doesn't work

I have troubles making my RelativeLayout change background drawable on click. I made it clickable and focusable but this make nothing change. The background remains static to enables drawable. Thanks in advance.
<RelativeLayout
android:id="#+id/bttn_type_rl"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="left"
android:background="#drawable/day_bttn_bg_red"
android:clickable="true"
android:focusable="true"
android:paddingLeft="5dp"
android:paddingRight="5dp" >
<ImageView
android:id="#+id/bttn_type_iv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_marginTop="5dp"
android:contentDescription="#string/app_name"
android:src="#drawable/relationship" />
<TextView
android:id="#+id/bttn_type_tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="#+id/bttn_type_iv"
android:layout_centerHorizontal="true"
android:layout_marginTop="1dp"
android:text="#string/type_bttn_txt"
android:textSize="#dimen/data_fill_bttn_txt_size"
android:textStyle="bold" />
</RelativeLayout>
Here is the selector xml in drawable:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/bttn_red_p_bg" android:state_enabled="false" android:state_pressed="true"></item>
<item android:drawable="#drawable/bttn_red_a_bg" android:state_enabled="true"></item>
</selector>