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>

RelativeLayout doesn't fill the screen horizontally

I have the following layout:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/fragment_container"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:id="#+id/app_name"
android:text="#string/app_name"
android:layout_centerHorizontal="true"
android:textSize="30sp"
android:textColor="#FF000000"
android:singleLine="true"
android:layout_marginTop="10dp"
android:layout_marginLeft="30dp"
android:layout_marginRight="30dp"
android:layout_alignParentTop="true"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</RelativeLayout>
I expected the layout to extend to the edges of the screen, but instead here's what I get:
The declared theme is Theme.K9Dialog:
<resources>
<style name="Theme.K9Dialog" parent="Theme.AppCompat.NoActionBar">
<item name="android:windowFrame">#null</item>
<item name="android:windowBackground">#drawable/popup_background</item>
<item name="android:windowIsFloating">true</item>
<item name="android:windowAnimationStyle">#android:style/Animation.Dialog</item>
<item name="android:windowContentOverlay">#drawable/panel_separator</item>
</style>
Am I misunderstanding what android:layout_width is supposed to do?

This is happening because of <item name="android:windowIsFloating">true</item> in your app theme, should work fine after removing that. Also I am not why you need all those attributes like android:windowFrame and ndroid:windowAnimationStyle in your app theme. If there is no such requirement try using default app theme and add only those attributes to theme which you want to change .

How to change the hint size of TextInputLayout

This is my xml
<android.support.design.widget.TextInputLayout
style="#style/main_input_text"
android:layout_marginTop="#dimen/activity_medium_margin"
app:hintTextAppearance="#style/TextAppearence.App.TextInputLayout">
<android.support.v7.widget.AppCompatEditText
style="#style/main_edit_text"
android:inputType="text" />
</android.support.design.widget.TextInputLayout>
And this is style
<style name="main_input_text">
<item name="android:layout_width">match_parent</item>
<item name="android:layout_height">#dimen/activity_edittext_height</item>
<item name="android:background">#drawable/mc_shape_border_button_transparent</item>
<item name="android:gravity">center_vertical</item>
<item name="android:paddingTop">#dimen/activity_extra_small_margin</item>
<item name="android:paddingBottom">#dimen/activity_extra_small_margin</item>
<item name="android:keyTextSize">8sp</item>
<item name="android:textSize">8sp</item>
</style>
I don't find something like hintSize, textSize and keyTextSize not helping

In your styles.xml
<style name="TextLabel" parent="TextAppearance.Design.Hint">
<item name="android:textSize">16sp</item>
</style>
And then in your layout file:
<android.support.design.widget.TextInputLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="#dimen/activity_horizontal_margin"
android:layout_marginRight="#dimen/activity_horizontal_margin"
android:layout_marginTop="12dp"
app:hintTextAppearance="#style/TextLabel"
android:minHeight="30dp">

Change the TextInputLayout's app:errorTextAppearance in XML.
<android.support.design.widget.TextInputLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:errorTextAppearance="#style/CustomTextInputLayoutStyle.ErrorTextStyle">
Where CustomTextInputLayoutStyle.ErrorTextStyle is defined in styles.xml as
<style name="CustomTextInputLayoutStyle.ErrorTextStyle" parent="TextAppearance.Design.Error">
<item name="android:textSize">10sp</item>
</style>

#Santiago Martínez answer only works for hints on non empty Edittext (inside TextInputLayout)
But for empty Edittext, TextInputLayout hint takes property from Edittext textSize.

1) Add hintTextAppearance to your InputLayout with a style
<android.support.design.widget.TextInputLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:hintTextAppearance="#style/TextInputLayoutHintText" >
<android.support.design.widget.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="16sp" />
</android.support.design.widget.TextInputLayout>
2) Then just add the style to your styles.xml
<style name="TextInputLayoutHintText">
<item name="android:textColor">#color/gray</item>
<item name="android:textSize">12sp</item></style>

For material 1.4.0
implementation 'com.google.android.material:material:1.4.0'
You only need to change the android:textSize attribute for the TextInputEditText for the hint size to change.
<com.google.android.material.textfield.TextInputLayout
style="#style/Widget.MaterialComponents.TextInputLayout.OutlinedBox"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<com.google.android.material.textfield.TextInputEditText
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:textSize="18sp"/>
</com.google.android.material.textfield.TextInputLayout>

You can reduce the font size on the EditText - that will reduce the size of the hint as well. i.e. android:textSize="16sp"

Stylizing material buttons in Android v21

I am trying to maintain the material design ripple effect for devices with lollipop and above (21+) and stylize the button so that it doesn't have a large margin/space around it.
Example 1: Buttons with ripple effect but with margin/gap:
Example 2: Buttons with NO ripple effect and without the margin/gap:
I want the layout of Exmaple 2 with the ripple effect that is used in Example 1.
What my styles-v21 look like for Example 1 :
<?xml version="1.0" encoding="utf-8"?>
<resources>
... other styles ...
<style name="FacebookButton" parent="android:Widget.Material.Button">
<item name="android:colorButtonNormal">#ff3b5998</item>
<item name="android:layout_margin">0dp</item>
<item name="android:borderlessButtonStyle">#style/Widget.AppCompat.Button.Borderless</item>
</style>
<style name="GoogleButton" parent="android:Widget.Material.Button">
<item name="android:colorButtonNormal">#ffdd4b39</item>
<item name="android:layout_margin">0dp</item>
<item name="android:borderlessButtonStyle">#style/Widget.AppCompat.Button.Borderless</item>
</style>
<style name="TwitterButton" parent="android:Widget.Material.Button">
<item name="android:colorButtonNormal">#ff55acee</item>
<item name="android:layout_margin">0dp</item>
<item name="android:borderlessButtonStyle">#style/Widget.AppCompat.Button.Borderless</item>
</style>
<style name="SkipButton" parent="android:Widget.Material.Button">
<item name="android:colorButtonNormal">#ffdfa800</item>
<item name="android:layout_margin">0dp</item>
<item name="android:borderlessButtonStyle">#style/Widget.AppCompat.Button.Borderless</item>
</style>
</resources>
What my button layout looks like for Example 1:
<Button
android:id="#+id/login_with_facebook"
android:text="#string/login_with_facebook"
android:fontFamily="sans-serif-condensed"
android:textSize="16sp"
android:drawableLeft="#drawable/facebook_icon"
android:drawablePadding="25dp"
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_weight="16.88"
android:textColor="#ffffff"
android:gravity="left|center_vertical"
android:paddingLeft="45dp"
android:theme="#style/FacebookButton" />
<Button
android:id="#+id/login_with_google"
android:text="#string/login_with_google"
android:fontFamily="sans-serif-condensed"
android:textSize="16sp"
android:drawableLeft="#drawable/google_icon"
android:drawablePadding="25dp"
android:layout_width="match_parent"
android:layout_height="45dp"
android:layout_weight="16.88"
android:textColor="#ffffffff"
android:gravity="left|center_vertical"
android:paddingLeft="45dp"
android:theme="#style/GoogleButton" />
<Button
android:id="#+id/twitter_login_button"
android:text="#string/login_with_twitter"
android:fontFamily="sans-serif-condensed"
android:textSize="16sp"
android:drawableLeft="#drawable/twitter_icon"
android:drawablePadding="25dp"
android:layout_height="45dp"
android:gravity="left|center_vertical"
android:layout_width="match_parent"
android:layout_weight="16.88"
android:textColor="#ffffffff"
android:paddingLeft="45dp"
android:theme="#style/TwitterButton" />
<Button
android:id="#+id/login_anonymously"
android:text="#string/login_anonymously"
android:fontFamily="sans-serif-condensed"
android:textSize="16sp"
android:layout_width="fill_parent"
android:layout_height="0dp"
android:layout_weight="50"
android:textColor="#ffffffff"
android:theme="#style/SkipButton" />
Any idea how I can achieve the look of Example 2 while using the ripple methodology I've presented? Any links to resources or help would be appreciated. Thanks.
Extra:
I've already read over the following
Coloring Buttons in Android with Material Design and AppCompat
How to properly style material buttons in android

You can use android:background="?android:attr/selectableItemBackground" to get a rectangular ripple.
Alternatively, you can create your own drawable. Here's the XML for the framework's selectable item background:
drawable/item_background_material.xml:
<ripple xmlns:android="http://schemas.android.com/apk/res/android"
android:color="?android:attr/colorControlHighlight">
<item android:id="#android:id/mask">
<color android:color="#android:color/white" />
</item>
</ripple>

Theme Style don't work on custom LiestView Items

I want to build a theme for my app. But it seems like my LiestView item don't apply the values.
This is the styles.xml:
<style name="AppTheme" parent="android:Theme.Holo.Light">
<item name="android:textViewStyle">#style/TextView</item>
</style>
<style name="TextView" parent="android:Widget.TextView">
<item name="android:layout_margin">8dp</item>
<item name="android:padding">0dp</item>
<item name="android:textColor">#87000000</item>
<item name="android:textSize">18sp</item>
</style>
in my activity i use a Listview with Custom Adapter but the TextViews from my item.xml did'nt have a margin:
<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="wrap_content"
android:clickable="true"
android:orientation="vertical"
tools:context="de.resper.enigma2chromecast.mainLive" >
<TextView
android:id="#+id/channelName"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:gravity="center_vertical"
android:text="#string/hello_world" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/hello_world"
android:id="#+id/channelLine1"/>
<View
android:layout_width="match_parent"
android:layout_height="1dp"
android:background="#android:color/darker_gray" />
</LinearLayout>

what ever you designed xml, put in android manifest file in application theme
<application android:theme="#style/CustomTheme">