Develop Reference

How to use default android themes?

Hy
I created an android project, and I saw thet, tehe are two themes.xml file. In emulator, when I switch day and night mode, my application color schema is changes too.
I thought it is greate, because with thease themes it will be easy to create a day/night app, but I don't know how it works.
How can I define a new color item inside themes, and use this schema for layout background?
For example: There is an item in both themes
<item name="colorPrimary">#303F9F</item>
And I would like to create a new item for both themes.xml, and use it to set up fragment background color, but the intellisense doesn't find this element directly.
<item name="backgroundColor">#303F9F</item>

You can change color easily from where you define your theme in 'styles.xml'.
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
<style name="AppThemeDark" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorSecondary</item>
<item name="colorPrimaryDark">#color/colorSecondaryDark</item>
<item name="colorAccent">#color/colorSecondaryAccent</item>
</style>
I have two themes in my app so if i change the color or anything in my theme i will define that color in my selected theme for example:
i want to change the background color of 'AppThemeDark' i just define the color like this
<item name="background">#color/"#fff67"</item>

copy this line in your first screen
AppCompatDelegate.setDefaultNightMode(AppCompatDelegate.MODE_NIGHT_NO);

Ok In constraintlayout background tag is not worked so I will fix this problem with the use of View.
<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"
android:background="#AAA">
<View
android:id="#+id/background"
android:layout_width="0dp"
android:layout_height="0dp"
android:background="#FFF"
app:layout_constraintBottom_toBottomOf="#+id/textView3"
app:layout_constraintEnd_toEndOf="#+id/textView1"
app:layout_constraintStart_toStartOf="#+id/textView1"
app:layout_constraintTop_toTopOf="#+id/textView1" />
<TextView
android:id="#+id/textView1"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:padding="8dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
tools:text="TextView" />
<TextView
android:id="#+id/textView2"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:padding="8dp"
app:layout_constraintEnd_toEndOf="#+id/textView1"
app:layout_constraintStart_toStartOf="#+id/textView1"
app:layout_constraintTop_toBottomOf="#+id/textView1"
tools:text="TextView" />
<TextView
android:id="#+id/textView3"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:padding="8dp"
app:layout_constraintEnd_toEndOf="#+id/textView1"
app:layout_constraintStart_toStartOf="#+id/textView1"
app:layout_constraintTop_toBottomOf="#+id/textView2"
tools:text="TextView" />
</android.support.constraint.ConstraintLayout>

Android toolbar background shadow

I want to make the same toolbar. Everything is perfect but can not get the shadow as the picture shows. I design the whole things but can not get the shadow. Can anyone plz guide me. I m posting my code below and attaching the image below:
layout design image
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.cardview.widget.CardView
android:id="#+id/cvToolbar"
style="#style/materialCardView"
android:layout_width="match_parent"
android:layout_height="#dimen/dp_56"
android:layout_marginStart="#dimen/dp_8"
android:layout_marginTop="#dimen/dp_8"
android:layout_marginEnd="#dimen/dp_8"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<androidx.appcompat.widget.AppCompatImageView
android:id="#+id/ivToolbarBack"
android:layout_width="#dimen/dp_0"
android:layout_height="wrap_content"
android:layout_marginStart="#dimen/dp_23"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_arrow_back" />
<androidx.appcompat.widget.AppCompatTextView
android:id="#+id/tvToolbarTitle"
style="#style/pinVerificationToolbarTextStyle"
android:layout_width="#dimen/dp_0"
android:layout_height="#dimen/dp_40"
android:layout_marginStart="#dimen/dp_24"
android:layout_marginTop="#dimen/dp_11"
android:layout_marginEnd="#dimen/dp_8"
android:layout_marginBottom="#dimen/dp_5"
android:gravity="top"
android:text="#string/pos_system"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/ivToolbarBack"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
</androidx.constraintlayout.widget.ConstraintLayout>
<style name="pinVerificationToolbarTextStyle">
<item name="android:textAppearance">#style/TextAppearance.Text.Regular</item>
<item name="android:textColor">#color/colorBlack</item>
<item name="android:textSize">22sp</item>
<item name="android:letterSpacing">-0.01</item>
<item name="android:textStyle">bold</item>
<item name="fontFamily">#font/martel_sans</item>
</style>
<style name="materialCardView">
<item name="cardBackgroundColor">#color/colorWhite</item>
<item name="cardCornerRadius">26dp</item>
<item name="cardElevation">1dp</item>
<item name="elevation">1dp</item>
<item name="android:translationZ">3dp</item>
</style>
can somebody please help me to resolve.

you can use android:background="#android:drawable/dialog_holo_light_frame" to get shadow also you can make a background drawable using any drawing software like photoshop ,xd etc
you can see this as a reference Android View shadow

Just add android:elevation=“6dp” in your toolbar

In your onCreate method of your activity code add the following code:
kotlin code:
supportActionBar?.elevation = 8F
java code:
getSupportActionBar().setElevation(8);
------------------------OR-----------------
kotlin code:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
actionBar?.elevation = 8F
}
java code:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getActionBar().setElevation(8);
}
to achieve 8dp of elevation in your app bar. (adding elevation is going to add shadow)
You can change the numeric value to achieve the desired elevation(shadow)

Android kotlin - Activity with black transparent background and SearchView with white background

As the title says I nedd an activity with black transparent background and a SearchView on top of it with white background and gray/custom text/icon colors.
This is what I have so far:
activity_search_input.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
tools:context=".SearchInput">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraintLayout"
android:layout_width="58dp"
android:layout_height="60dp"
android:background="#FFFFFF"
app:layout_constraintEnd_toStartOf="#+id/searchInput"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_back" />
</androidx.constraintlayout.widget.ConstraintLayout>
<SearchView
android:id="#+id/searchInput"
android:layout_width="0dp"
android:layout_height="60dp"
android:background="#FFFFFF"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/constraintLayout"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
Even though the background is set to #FFFFFF it is gray!
in manifest:
<activity
android:name=".SearchInput"
android:theme="#style/Theme.AppCompat.Translucent">
</activity>
in styles.xml:
<style name="Theme.AppCompat.Translucent" parent="Theme.AppCompat.NoActionBar">
<item name="android:background">#66000000</item> <!-- Or any transparency or color you need -->
<item name="android:windowNoTitle">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:colorBackgroundCacheHint">#null</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowAnimationStyle">#android:style/Animation</item>
</style>
How can I do that? I'm already searching since couple hours for a solution for such a minor thing! Android is absolutely horrendous!

True testing this out was indeed a horrendous experience unless there's an easy method I'm unaware of. Here's a workaround I found for your case.
The main issue is this line <item name="android:background">#66000000</item> in your Translucent style, that messes up the colors which the searchView uses behind the scenes. Remove that and the background you set for searchView should be working now.
But you'll notice all the icons and textcolor remain white you will have to either individually set these with custom icons (for some reason the textColor still wouldn't change) or simply use parent="Theme.AppCompat.Light.NoActionBar" as the parent for your translucent theme.
So now your custom Translucent theme should look like below:
<style name="Theme.AppCompat.Translucent" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:windowNoTitle">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:colorBackgroundCacheHint">#null</item>
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowAnimationStyle">#android:style/Animation</item>
</style>
Now since you have removed the window background from theme you will need to set a background to the root layout using android:background="#66000000"
So your activity_search_input.xml:
<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.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"
android:background="#66000000"
tools:context=".SearchInput">
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/constraintLayout"
android:layout_width="58dp"
android:layout_height="60dp"
android:background="#FFFFFF"
app:layout_constraintEnd_toStartOf="#+id/searchInput"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent">
<ImageView
android:id="#+id/imageView3"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:srcCompat="#drawable/ic_back" />
</androidx.constraintlayout.widget.ConstraintLayout>
<SearchView
android:id="#+id/searchInput"
android:layout_width="0dp"
android:layout_height="60dp"
android:background="#FFFFFF"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintStart_toEndOf="#+id/constraintLayout"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
The result was this
Tried different ways but this felt the easiest, check if this helps you out, or maybe someone will come up with a better method.

Android | Add line on the navbar

In my v27\style.xml I have the following code to set a white navbar:
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="android:navigationBarColor">#android:color/white</item>
<item name="android:windowLightNavigationBar">true</item>
</style>
It works, but the white navbar "joins" with the white background. I would to add an horizontal line on the navbar, in each activity. How can I do?
This is what I would (from Youtube), I highlighted it with red rectangle:

I think for cases like these you may need to have a custom toolbar layout so that you can optimise the layout whichever way you like.
Something like this:
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<TextView
android:id="#+id/tvToolBarTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textSize="18sp"
android:text="Toobar"
android:fontFamily="#font/filson_pro_book"
android:textColor="#color/white"
android:visibility="visible"/>
<FrameLayout
android:layout_gravity="center_horizontal"
android:background="#color/white"
android:layout_width="100dp"
android:layout_height="1dp"/>
</LinearLayout>

You would probably want to add an horizontal line each time you open the nav drawer:
<View
android:layout_width="fill_parent"
android:layout_height="1dp"
android:background="#FF0000FF"
android:layout_gravity = "bottom/>
If you want the line to be on half of the screen (only on the nav)- add it inside the nav.
If you want the line to be on the whole screen (as you marked in the picture)- add it after adding the nav.

Since API 27 there is an attribute in the style called navigationBarDividerColor that allows to do that. You can complement it with the navigationBarColor to make it look like the one in your screenshot.
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light">
...
<item name="android:navigationBarColor">#android:color/white</item>
<item name="android:navigationBarDividerColor">#DBDBDB</item>
</style>
</resources>

ConstraintLayout TextView is not shown

I got the following problem in my ConstraintLayout
Layout File:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="wrap_content"
android:background="#color/colorPrimary"
android:minHeight="?android:attr/actionBarSize"
android:orientation="horizontal"
android:paddingEnd="8dp">
<android.support.constraint.ConstraintLayout
android:id="#+id/layout_titlemode"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/textView_title"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_marginBottom="8dp"
android:layout_marginLeft="32dp"
android:layout_marginRight="32dp"
android:layout_marginTop="8dp"
android:text="TextView"
android:textAlignment="center"
android:textColor="#color/colorUnactive"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.5"/>
</android.support.constraint.ConstraintLayout>
</LinearLayout>
Styles (using AppTheme):
<resources>
<style name="AppTheme" parent="Theme.MultiBackStack">
<item name="android:textColorPrimary">#color/colorTextPrimary</item>
</style>
<style name="Theme.MultiBackStack" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimary</item>
<item name="android:textColorPrimary">#color/colorTextPrimary</item>
</style>
</resources>
This is what I expected due to preview:
I excepted that the TextView would take all the available space (like match_parent) and that the text is shown in the center of the view.
This is what is actually shown:
Instead, nothing is shown actually (I guess because of the layout_width="0dp")
The newest version of the constraint support library is added:
'com.android.support.constraint:constraint-layout:1.0.2'
What I tried in addition:
I added to the TextView app:layout_constraintWidth_default="wrap"
This let the TextView shown up, but it starts on the left and is not centered. How can I achieve to center the view ?
I can't determine why nothing is shown.
Thank you in advance for your helping!

try using theme.
<style name="AppTheme" parent="Theme.AppCompat.Light">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorAccent">#color/colorAccent</item>
<item name="colorPrimaryDark">#color/colorPrimaryD</item>
</style>

Try using this theme in style.xml file
<style name="AppTheme" parent="Base.Theme.AppCompat.Light.DarkActionBar">