Develop Reference

How to change Apptheme?

Image error I have 2 styles files. With a click on a button I want to switch from AppTheme to AppTheme2. how to make?
Note that the primary color is with a code, colorPrymary2. That would change the color of my app completely, and that's what I want.
Manifest.xml
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity android:name=".MainActivity">
styles.xml
<resources>
<style name="AppTheme" parent="Theme.AppCompat">
<item name="android:windowBackground">#drawable/background</item>
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
<style name="AppTheme2" parent="Theme.AppCompat">
<item name="android:windowBackground">#drawable/background</item>
<item name="colorPrimary">#color/colorPrimary2</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
</resources>

Just do it in onCreate() method!
getApplication().setTheme(R.style.yourtheme);

Change AppTheme dynamically

Goal: I want to allow user to change the color theme of my app.
Themes (styles.xml):
<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/indigoColorPrimary</item>
<item name="colorPrimaryDark">#color/indigoColorPrimaryDark</item>
<item name="colorAccent">#color/indigoColorAccent</item>
<item name="android:statusBarColor">#color/indigoColorPrimaryDark</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
<style name="AppTheme.FullScreen">
<item name="android:windowFullscreen">true</item>
<item name="android:windowContentOverlay">#null</item>
</style>
<style name="AppTheme.MainActivity">
<item name="android:statusBarColor">#android:color/transparent</item>
</style>
<style name="AppTheme.SearchActivity">
<item name="android:statusBarColor">#android:color/darker_gray</item>
<item name="android:windowAnimationStyle">#null</item>
</style>
<!-- Colors -->
<style name="AppTheme.Indigo">
<item name="colorPrimary">#color/indigoColorPrimary</item>
<item name="colorPrimaryDark">#color/indigoColorPrimaryDark</item>
<item name="colorAccent">#color/indigoColorAccent</item>
<item name="android:statusBarColor">#color/indigoColorPrimaryDark</item>
</style>
<style name="AppTheme.Blue">
<item name="colorPrimary">#color/blueColorPrimary</item>
<item name="colorPrimaryDark">#color/blueColorPrimaryDark</item>
<item name="colorAccent">#color/blueColorAccent</item>
<item name="android:statusBarColor">#color/blueColorPrimaryDark</item>
</style>
<style name="AppTheme.Red">
<item name="colorPrimary">#color/redColorPrimary</item>
<item name="colorPrimaryDark">#color/redColorPrimaryDark</item>
<item name="colorAccent">#color/redColorAccent</item>
<item name="android:statusBarColor">#color/redColorPrimaryDark</item>
</style>
<!-- some other colors -->
</resources>
As you can see, I have the main theme AppTheme that as a default color ("indigo").
I have three other themes FullScreen, MainActivity and SearchActivity that derive from AppTheme, and then colors themes.
AndroidManifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.superbstudios.reportnote">
<uses-permission android:name="android.permission.INTERNET" />
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:roundIcon="#mipmap/ic_launcher_round"
android:supportsRtl="true"
android:theme="#style/AppTheme">
<activity
android:name=".SignInActivity"
android:screenOrientation="portrait"
android:theme="#style/AppTheme.FullScreen" />
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".SearchActivity"
android:label=""
android:theme="#style/AppTheme.SearchActivity"
android:windowSoftInputMode="stateVisible" />
<activity
android:name=".SettingsActivity"
android:label="#string/title_activity_settings"
android:theme="#style/AppTheme" />
<activity
android:name=".GuideActivity"
android:label="#string/title_activity_guide"
android:theme="#style/AppTheme" />
</application>
</manifest>
Now, only SignInActiviy, MainActivity and SearchActivity has their own themes, the other activity (also application) has AppTheme.
What I do: I create a BaseActivity class, and all activity extend this class.In BaseActivity in onCreate method before super declaration I use this code to change color theme:
setTheme(R.style.AppTheme_Red);
Problem: This code change the theme for all activity and also for SignInActiviy, MainActivity and SearchActivity that needs a different theme.
I don't know if the colors theme are useful.
The only things i want is to change the AppTheme colors like this:
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/redColorPrimary</item>
<item name="colorPrimaryDark">#color/redColorPrimaryDark</item>
<item name="colorAccent">#color/redColorAccent</item>
<item name="android:statusBarColor">#color/redColorPrimaryDark</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
So, what I have to do to change colors of my app?

I solved it by changing styles.xml
<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<item name="colorPrimary">#color/indigoColorPrimary</item>
<item name="colorPrimaryDark">#color/indigoColorPrimaryDark</item>
<item name="colorAccent">#color/indigoColorAccent</item>
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
<style name="AppTheme.FullScreen">
<item name="android:windowFullscreen">true</item>
<item name="android:windowContentOverlay">#null</item>
</style>
<style name="AppTheme.MainActivity">
<item name="android:statusBarColor">#android:color/transparent</item>
</style>
<style name="AppTheme.SearchActivity">
<item name="android:statusBarColor">#android:color/darker_gray</item>
<item name="android:windowAnimationStyle">#null</item>
</style>
<!-- Colors -->
<style name="Indigo">
<item name="colorPrimary">#color/indigoColorPrimary</item>
<item name="colorPrimaryDark">#color/indigoColorPrimaryDark</item>
<item name="colorAccent">#color/indigoColorAccent</item>
</style>
<style name="Blue">
<item name="colorPrimary">#color/blueColorPrimary</item>
<item name="colorPrimaryDark">#color/blueColorPrimaryDark</item>
<item name="colorAccent">#color/blueColorAccent</item>
</style>
<style name="Red">
<item name="colorPrimary">#color/redColorPrimary</item>
<item name="colorPrimaryDark">#color/redColorPrimaryDark</item>
<item name="colorAccent">#color/redColorAccent</item>
</style>
</resources>
And in my BaseActivity i use this code:
getTheme().applyStyle(R.style.Blue, true);

Referenced to the comment
I'll answer by taking Red color as an example
If you only want to change the colorPrimary then keep only it.
<style name="AppTheme.Red">
<item name="colorPrimary">#color/redColorPrimary</item>
</style>
Other wise create two themes for Red color. One with status bar color and other inheriting that with transparent status bar.
<style name="AppTheme.Red">
<item name="colorPrimary">#color/redColorPrimary</item>
<item name="colorPrimaryDark">#color/redColorPrimaryDark</item>
<item name="colorAccent">#color/redColorAccent</item>
<item name="android:statusBarColor">#color/redColorPrimaryDark</item>
</style>
<style name="AppTheme.RedTransparentStatus" parent="AppTheme.Red>
<item name="android:statusBarColor">#android:color/transparent</item>
</style>
So if you want status bar to transparent you can set the second theme or else the first.
From my understanding, you want to keep the default "Indigo" color for
SignInActivity, MainActivity, SearchActivity.
Todo so inherit the relevant themes of those activities with AppTheme
<style name="AppTheme.SearchActivity" parent="AppTheme">
...
</style>

Make toolbar and menu button have smaller height

I have a toolbar (please see xml below). Is there any easy way to make the tool bar thinner and keep the menu button.
Or maybe just have a menu button in some corner?
This started out as a full screen activity, but i roll up my own view and do a: setContentView(view);
thanks
<activity
android:name=".FullscreenActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/app_name"
android:theme="#style/FullscreenTheme">
<intent-filter>
<action android:name="android.intent.action.MAIN"/>
<category android:name="android.intent.category.LAUNCHER"/>
</intent-filter>
</activity>
<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="FullscreenTheme" parent="AppTheme">
<item name="android:actionBarStyle">#style/FullscreenActionBarStyle</item>
<item name="android:windowActionBarOverlay">true</item>
<item name="android:windowBackground">#null</item>
<item name="metaButtonBarStyle">?android:attr/buttonBarStyle</item>
<item name="metaButtonBarButtonStyle">?android:attr/buttonBarButtonStyle</item>
</style>
<style name="FullscreenActionBarStyle" parent="Widget.AppCompat.ActionBar">
<item name="android:background">#color/black_overlay</item>
</style>
</resources>

Specifying this styles:
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
...
<item name="actionBarSize">20dp</item>
<item name="actionBarStyle">#style/MyActionBarStyle</item>
</style>
<style name="MyActionBarStyle" parent="Widget.AppCompat.Light.ActionBar.Solid">
<item name="actionButtonStyle">#style/MyActionButtonStyle</item>
<item name="displayOptions">homeAsUp</item>
</style>
<style name="MyActionButtonStyle" parent="Widget.AppCompat.Light.ActionButton">
<item name="android:minWidth">20dp</item>
<item name="android:minHeight">20dp</item>
</style>
Will result in this output:

How to create trasparent activity when i click Floating action button

First sorry for my bad English ,I am creating activity within that activity , i create floating action button ,when i click Floating Action Button on click action i show one activity it working fine but how to change my activity to transparent activity with no action bar
i change manifest file but getting some errors
mainifest file
<?xml version="1.0" encoding="utf-8"?>
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:supportsRtl="true"
android:theme="#style/AppTheme" >
<activity
android:name=".MainActivity"
android:label="#string/app_name"
android:theme="#style/AppTheme.NoActionBar" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".FullscreenActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/title_activity_fullscreen"
android:theme="#style/FullscreenTheme" >
</activity>
<activity
android:name="com.aa.bunny.aabunny.Main2Activity"
android:theme="#android:style/Theme.Translucent.NoTitleBar.Fullscreen" >
</activity>
<activity
android:name=".ScrollingActivity"
android:label="#string/title_activity_scrolling"
android:theme="#style/AppTheme.NoActionBar" >
</activity>
<activity android:name=".Main22Activity" >
</activity>
</application>
Style.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="AppTheme.NoActionBar">
<item name="windowActionBar">false</item>
<item name="windowNoTitle">true</item>
</style>
<style name="AppTheme.AppBarOverlay" parent="ThemeOverlay.AppCompat.Dark.ActionBar" />
<style name="AppTheme.PopupOverlay" parent="ThemeOverlay.AppCompat.Light" />
<style name="FullscreenTheme" parent="AppTheme">
<item name="android:actionBarStyle">#style/FullscreenActionBarStyle</item>
<item name="android:windowActionBarOverlay">true</item>
<item name="android:windowBackground">#null</item>
<item name="metaButtonBarStyle">?android:attr/buttonBarStyle</item>
<item name="metaButtonBarButtonStyle">?android:attr/buttonBarButtonStyle</item>
</style>
<style name="FullscreenActionBarStyle" parent="Widget.AppCompat.ActionBar">
<item name="android:background">#color/black_overlay</item>
</style>
<style name="Transparent" parent="android:Theme">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>

Change activity theme to achieve transparency.
create a style like this
<style name="Theme.Transparent" parent="android:Theme">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>
and use this in manifest
<activity android:name=".TransparentActivity" android:theme="#style/Theme.Transparent">
Happy coding...

You can apply theme like..
android:theme="#android:style/Theme.Translucent"
Or else you can also create your own theme in style..
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.Transparent" parent="android:Theme">
<item name="android:windowIsTranslucent">true</item>
<item name="android:windowBackground">#android:color/transparent</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:windowNoTitle">true</item>
<item name="android:windowIsFloating">true</item>
<item name="android:backgroundDimEnabled">false</item>
</style>
</resources>
You can also Set background of the activity as a transparent png image or a transparent color code

Can't apply Theme from Android Action Bar Style Generator

I finished Android Action Bar Style Generator and downloaded the zip from there.
I copied and pasted all the folder in res, then changed the theme to let my app use the theme I edited. but The result is nothing changed!!!!
I am still beginner here. I am still not sure if there are other thing to deal with about changing Theme.
style_example.xml in folder values (created by the generator)
<style name="Theme.Example" parent="#style/Theme.AppCompat.Light.DarkActionBar">
<item name="actionBarItemBackground">#drawable/selectable_background_example</item>
<item name="popupMenuStyle">#style/PopupMenu.Example</item>
<item name="dropDownListViewStyle">#style/DropDownListView.Example</item>
<item name="actionBarTabStyle">#style/ActionBarTabStyle.Example</item>
<item name="actionDropDownStyle">#style/DropDownNav.Example</item>
<item name="actionBarStyle">#style/ActionBar.Solid.Example</item>
<item name="actionModeBackground">#drawable/cab_background_top_example</item>
<item name="actionModeSplitBackground">#drawable/cab_background_bottom_example</item>
<item name="actionModeCloseButtonStyle">#style/ActionButton.CloseMode.Example</item>
<!-- Light.DarkActionBar specific -->
<item name="actionBarWidgetTheme">#style/Theme.Example.Widget</item>
</style>
<style name="ActionBar.Solid.Example" parent="#style/Widget.AppCompat.Light.ActionBar.Solid.Inverse">
<item name="background">#drawable/ab_solid_example</item>
<item name="backgroundStacked">#drawable/ab_stacked_solid_example</item>
<item name="backgroundSplit">#drawable/ab_bottom_solid_example</item>
<item name="progressBarStyle">#style/ProgressBar.Example</item>
</style>
<style name="ActionBar.Transparent.Example" parent="#style/Widget.AppCompat.ActionBar">
<item name="background">#drawable/ab_transparent_example</item>
<item name="progressBarStyle">#style/ProgressBar.Example</item>
</style>
<style name="PopupMenu.Example" parent="#style/Widget.AppCompat.PopupMenu">
<item name="android:popupBackground">#drawable/menu_dropdown_panel_example</item>
</style>
<style name="DropDownListView.Example" parent="#style/Widget.AppCompat.ListView.DropDown">
<item name="android:listSelector">#drawable/selectable_background_example</item>
</style>
<style name="ActionBarTabStyle.Example" parent="#style/Widget.AppCompat.ActionBar.TabView">
<item name="android:background">#drawable/tab_indicator_ab_example</item>
</style>
<style name="DropDownNav.Example" parent="#style/Widget.AppCompat.Spinner.DropDown.ActionBar">
<item name="android:background">#drawable/spinner_background_ab_example</item>
<item name="android:popupBackground">#drawable/menu_dropdown_panel_example</item>
<item name="android:dropDownSelector">#drawable/selectable_background_example</item>
</style>
<style name="ProgressBar.Example" parent="#style/Widget.AppCompat.ProgressBar.Horizontal">
<item name="android:progressDrawable">#drawable/progress_horizontal_example</item>
</style>
<style name="ActionButton.CloseMode.Example" parent="#style/Widget.AppCompat.ActionButton.CloseMode">
<item name="android:background">#drawable/btn_cab_done_example</item>
</style>
<!-- this style is only referenced in a Light.DarkActionBar based theme -->
<style name="Theme.Example.Widget" parent="#style/Theme.AppCompat">
<item name="popupMenuStyle">#style/PopupMenu.Example</item>
<item name="dropDownListViewStyle">#style/DropDownListView.Example</item>
</style>
AndroidManifest.xml (I just forgot to change the name so it is "Theme.Example")
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.mes.learnupdater1" >
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/Theme.Example" > --------------------- Theme applied
<activity
android:name=".MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".Main2Activity"
android:label="#string/title_activity_main2" >
</activity>
</application>
</manifest>

If you want customized your them you need to edit theme under the value folder style. XML file