Develop Reference

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>

How to bring ImageView under the transparent Status Bar

In the images below,I am trying to bring the ImageView under the StatusBar. But its not happening.
Image Screenshot on Android API 19
Image Screenshot on Android API 22
I went on Android transparent status bar and actionbar (this question) and tried to implement the same but its not working.
The xml layout of the activity is
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout
android:layout_height="match_parent"
android:layout_width="match_parent"
android:fitsSystemWindows="true"
xmlns:android="http://schemas.android.com/apk/res/android">
<LinearLayout
android:id="#+id/category_layout_top"
android:fitsSystemWindows="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:fitsSystemWindows="true"
android:layout_width="390dp"
android:layout_height="390dp"
android:id="#+id/category_Image_View"/>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/def_toolbar"
android:layout_height="wrap_content"
android:layout_width="match_parent"
android:minHeight="?attr/actionBarSize"
android:background="#00FFFFFF"
android:layout_alignParentTop="true" />
</FrameLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="50dp"
android:id="#+id/category_linearlayout">
<TextView android:layout_width="match_parent"
android:layout_height="match_parent"
android:singleLine="true"
android:id="#+id/category_textView"
/>
</LinearLayout>
</LinearLayout>
</FrameLayout>
I tried the below code in the onCreate() method also
setStatusBarTranslucent(true);
protected void setStatusBarTranslucent(boolean makeTranslucent) {
if (makeTranslucent) {
getWindow().addFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
} else {
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_TRANSLUCENT_STATUS);
}
}
style.xml
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
style-v21.xml
<style name="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
<item name="android:windowDrawsSystemBarBackgrounds">true</item>
<item name="android:statusBarColor">#android:color/transparent</item>
</style>
AppTheme is the style used in the activity.
EDIT 1
I used a color in the background of FrameLayout to check whether it was under the status bar or not. And it is not.
So the problem is not with Layout, I guess.
EDIT 2
this is the desired result

In style-v21 you are overriding the style AppTheme.NoActionBar, but you said the style you use in your activity is the AppTheme style.
You need to override the AppTheme layout in style-v21 or define AppTheme.NoActionBar in you activity.

Android Toolbar color not being set by colorPrimary

according to the google docs, I should be able to set the color of Toolbar background using colorPrimary in the theme, but it's not working. Here's what I have:
styles.xml:
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<!-- Customize your theme here. -->
<item name="colorPrimary">#color/light_purple</item>
<!-- colorPrimaryDark is used for the status bar -->
<item name="colorPrimaryDark">#color/dark_purple</item>
<!-- colorAccent is used as the default value for colorControlActivated,
which is used to tint widgets -->
<item name="colorAccent">#color/dark_purple</item>
<item name="colorSwitchThumbNormal">#color/light_purple</item>
</style>
</resources>
activity layout:
<LinearLayout 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"
android:orientation="vertical"
tools:context=".MainActivity">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
android:theme="#style/AppTheme"
tools:showIn="#layout/activity_main">
<TextView
android:id="#+id/pivot_title_image"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:text="toolbar text view" />
</android.support.v7.widget.Toolbar>
...
</LinearLayout>
Activity:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
}
I have set my app theme to AppTheme in the manifest: android:theme="#style/AppTheme" >
I have setup android support appcompat in build.gradle
compile 'com.android.support:appcompat-v7:22.1.0'
But my toolbar, is still not colored.
I know I can manually set the toolbar background color manually in the layout file, but shouldn't it get its color from the theme? as you can see the accent colors are working.

Toolbar will not get primary color from your theme. You have to set the following xml property of the toolbar
android:background="#color/primary"
This is my working implementation of toolbar.
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/primary"
android:minHeight="?actionBarSize">
</android.support.v7.widget.Toolbar>
Hope it works for you too.

Style and theme are different.
The style is local to the Toolbar view, for example the background color.
The theme is instead global to all ui elements inflated in the Toolbar, for example the color of the title and icons.
More info here.
With Material Components Library:
the android:background attribute in the layout:
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
apply the default style: style="#style/Widget.MaterialComponents.Toolbar.Primary" or customize the style inheriting from it:
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
style="#style/Widget.MaterialComponents.Toolbar.Primary"
override the default color using the android:theme attribute:
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:theme="#style/MyThemeOverlay_Toolbar"
with:
<style name="MyThemeOverlay_Toolbar" parent="ThemeOverlay.MaterialComponents.Toolbar.Primary">
<item name="android:textColorPrimary">....</item>
<item name="colorPrimary">#color/.....
<item name="colorOnPrimary">#color/....</item>
</style>
With design support library:
<android.support.v7.widget.Toolbar
style="#style/HeaderBar"/>
where:
<style name="HeaderBar">
<item name="android:background">?colorPrimary</item>
</style>
Otherwise you can define the background for your Toolbar.
<android.support.v7.widget.Toolbar
android:background="?attr/colorPrimary">

You have to use android: prefixed attributes in the theme for android 5+, as the non-prefixed variant is only for the app compat parts for versions < android 5.
So you should have one values/styles.xml for pre-android 5 and one values-v21/styles.xml for android 5+.
In the v21 styles you define your theme as following:
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="android:colorPrimary">#color/light_purple</item>
<item name="android:colorPrimaryDark">#color/dark_purple</item>
<item name="android:colorAccent">#color/dark_purple</item>
</style>
As you now define the colorPrimary attribute once simply as colorPrimary for pre-Lollipop and once as android:colorPrimary for Lollipop devices, you can no longer directly use ?attr/colorPrimary. Instead, like others here said before, you should define your own style for the toolbar, but for both variations:
values/styles.xml:
<style name="Toolbar">
<item name="android:background">?attr/colorPrimary</item>
</style>
values-v21/styles.xml:
<style name="Toolbar">
<item name="android:background">?android:attr/colorPrimary</item>
</style>
And use the style for your toolbar:
<android.support.v7.widget.Toolbar
style="#style/Toolbar"
Like this the background color and other styles can be set on all versions and is still changeable by the colorPrimary that is set in the theme(s).

Try to set background color to toolbar
This worked for me
<?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"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar_main"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:background="#color/primary_color"
android:gravity="right"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<ProgressBar
android:id="#+id/pb_loading_news"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="right"
android:visibility="gone" />
</android.support.v7.widget.Toolbar>

Android: How to change the style of a ViewPager?

activity_main.xml
<?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"
android:orientation="vertical">
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v4.view.PagerTabStrip
android:id="#+id/pager_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:padding="#dimen/abc_action_bar_content_inset_material" />
</android.support.v4.view.ViewPager>
</LinearLayout>
I'd like to apply a different style to ViewPager and PagerTabStrip . I tried some of the default styles provided by Android that could change the appearance of a tab bar and indicators but nothing happened.
Please, are there any useful styles for this purpose? Maybe I could inherit and change some attributes.
These are the related declaration in activity.java
public class MainActivity extends FragmentActivity
and current style.xml
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>

If you are looking to change the colors (accordingly to the theme), you can customize the theme, ex:
<style name="AppTheme" parent="Theme.AppCompat">
<item name="colorPrimary">#color/md_light_blue_500</item>
<item name="colorPrimaryDark">#color/md_light_blue_700</item>
<item name="colorAccent">#color/md_blue_a200</item>
</style>
And add a background attribute:
<android.support.v4.view.PagerTabStrip
android:id="#+id/pager_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:background="?attr/colorPrimaryDark"
android:padding="#dimen/abc_action_bar_content_inset_material" />
Hope i gave you some ideas :)

Tint CheckBox and Toolbar stuff separately

I'm currently using the usually amazing appcompat-v7 library in my application and I'm trying to tint my CheckBoxes without changing the Icon-Colors in the Toolbar (like the back arrow or those three dots).
Following how it looks currently - as you can see not only the CheckBox is tinted pink, the back-arrow / three-dots are also tinted pink.
My code:
Layout
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:background="?colorPrimary"
android:elevation="4dp" />
<CheckBox
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_margin="16dp"
android:text="My CheckBox" />
</LinearLayout>
Application-Theme
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#FFC107</item>
<item name="colorPrimaryDark">#FFA000</item>
<item name="android:textColorPrimary">#FFF</item>
<item name="android:textColorSecondary">#FFF</item>
<item name="colorControlNormal">#E91E63</item>
</style>
Question
What do I need to change so that the Checkbox gets pink and the Toolbar-stuff keeps being white?
Side-Note:
I guess the main problem is that I simply can't find a page where every single appcompat attribute is described. It's basically just all-out trial and error since the names of those attributes are no clear indication.

You're basically facing the same issue as described in this or this question.
So the only thing you need to do is to create a Style for your Toolbar which uses an other theme as the Activity.
Toolbar style / theme example
<style name="MyToolbarStyle">
<!-- potential other attributes -->
<item name="theme">#style/MyToolbarTheme</item>
</style>
<style name="MyToolbarTheme">
<!-- Used to tint the back arrow, menu and spinner arrow -->
<item name="colorControlNormal">#FFF</item>
</style>
Add this Style to your Toolbar and your issue should be fixed (it is important not to use the theme directly):
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
style="#style/MyToolbarStyle"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:background="?colorPrimary"
android:elevation="4dp" />