Develop Reference

AndroidManifest - Set theme for activity

I am really frustrated right now and read a ton - maybe you can help me out.
Why is Android Studio still showing me "Main2Activity" with the titlebar?
Here is my Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.martin.myapplication">
<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=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity android:name=".Main2Activity"
android:theme="#android:style/Theme.Light.NoTitleBar"></activity>
</application>
I know it is really a small issue but I am unable to figure it out...
Sources I used:
https://developer.android.com/guide/topics/ui/look-and-feel/themes.html
Android theme not being set
Apply a theme to an activity in Android?
EDIT
Current State:
enter image description here
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
Is working but disables the ActionBar for every Activity!
Goal: activity_main2 should not have an ActionBar.
SOLVED It is just a bug from Android Studio. In the Preview it won't disable the AppBar but as soon as you play the App on your phones it works!

To Hide the Action Bar add the below code in Values/Styles
<style name="CustomActivityThemeNoTitle" parent="#android:style/Theme.Light">
<item name="android:windowNoTitle">true</item>
</style>
Then in your AndroidManifest.xml file add the below code in the required activity:
<activity android:name=".Main2Activity"
android:theme="#style/CustomActivityThemeNoTitle"></activity>
Alternatively, you can call this.requestWindowFeature(Window.FEATURE_NO_TITLE); in the onCreate method for your activity. For example:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_signup);
...
}

Try this
<style name="generalnotitle" parent="general">
<item name="android:windowNoTitle">true</item>
</style>

ActionBar is missing after switching to API21 AppCompat

While working on the Big Nerd Ranch's Criminal Intent project when I updated my AppCompat library from API 19 to API 21 I lost ActionBar. I have tried changing themes around but I can't find a way to get ActionBar.
The full source code is available here.
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.sudhirkhanger.app.criminalintent" >
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity android:name=".CrimeListActivity" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".CrimePagerActivity"
android:label="#string/app_name" >
</activity>
</application>
</manifest>
style.xml
<resources>
<!-- Base application theme. -->
<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
<!-- Customize your theme here. -->
</style>
</resources>
Thanks.

To use appcompat-v7, you must inherit from ActionBarActivity. CrimeListActivity inherits from SingleFragmentActivity, which in turn inherits from FragmentActivity, not ActionBarActivity.

I also had that problem I moved the whole line (android:theme="#style/AppTheme) and its works! The theme is a dark theme which looks better.

I came across this issue as well.
The solution is remove the style tag from the manifest.xml (android:theme="#style/AppTheme").
It will use the holo theme, but with the Action Bar.

How to change launcher icon and it's label from the application

How can I change the launcher icon and its label from my application runtime in Android? (if it is possible)
I mean the properties defined in AndroidManifest.xml: android:icon and android:label. I want to replace it by the image I take from the camera.

This entire answer is from this post and it was taken from P-A and CommonsWare.
You cannot change the manifest or the resource in the signed-and-sealed APK, except through a software upgrade. or
Try this, it`s work fine for me but not sure for all devices:
Modify your MainActivity section in AndroidManifest.xml, delete from it, line with MAIN category in intent-filter section.
<activity android:name="ru.quickmessage.pa.MainActivity"
android:configChanges="keyboardHidden|orientation"
android:screenOrientation="portrait"
android:label="#string/app_name"
android:theme="#style/CustomTheme"
android:launchMode="singleTask">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />//DELETE THIS LINE
</intent-filter>
</activity>
Create <activity-alias> for your app, for each of your icons. Like this
<activity-alias android:label="#string/app_name"
android:icon="#drawable/icon"
android:name=".MainActivity-Red"
android:enabled="false"
android:targetActivity=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity-alias>
Set programmatically ENABLE attribute for necessary
getPackageManager().setComponentEnabledSetting(
new ComponentName("ru.quickmessage.pa", "ru.quickmessage.pa.MainActivity-Red"),
PackageManager.COMPONENT_ENABLED_STATE_ENABLED, PackageManager.DONT_KILL_APP);
Note, At least one must be enabled and above code perfect working up to 4.0 not tested into >4.0.

Edit: your original answer didn't specify you wanted to do it at runtime. Below the line is how to do it before it compiles. As for doing it programmatically at runtime:
From this answer:
You cannot change the manifest or the resource in the signed-and-sealed APK, except through a software upgrade.
But also, the accepted answer figured out a "hack" or some cheating way to do it (I presume). I haven't tested it, but there is a source for you to check out.
Or, this link apparently describes how to do this using the "widget" approach.
So lets say your manifest was like this:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="yourPackage"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
...
You would change the launcher icon by putting images into your drawable folders:
Project folder --> res --> all the drawables
Then you would change the android:icon="#drawable/ic_launcher" to be android:icon="#drawable/whateverTheNameOfTheImageIsYouPutInTheDrawablesFolders"
To change the label:
Open up your strings.xml file which is located:
Project folder --> res --> values --> strings.xml
And look for the string that looks like this:
<string name="app_name">Your App Name</string>
And just change Your App Name to be whatever you want the label to be.
Summary:
android:icon="#drawable/ic_launcher" determines your launcher icon, so just add images to the drawable folders and change ic_launcher to whatever the name of image is that you want to be the icon.
android:label="#string/app_name" determines your "label" so just look for app_name (because the label is referenced to #string/app_name) in your strings.xml file and change the contents of app_name.

ActionBarCompat, supportRequestWindowFeature(Window.FEATURE_NO_TITLE) and expected behavior

I'm uncertain of the expected behavior when using ActionBarCompat and supportRequestWindowFeature(Window.FEATURE_NO_TITLE). I see two different behaviors depending on Android version:
On a Android ICS (possibly also from Android 3.0?) device using ActionBarCompat a call to supportRequestWindowFeature(Window.FEATURE_NO_TITLE) would hide the combined titlebar/actionbar
On a Android 2.3 device the actionbar is still visible even though supportRequestWindowFeature(Window.FEATURE_NO_TITLE) is called.
Some additional information: My activities extend android.support.v7.app.ActionBarActivity and my app uses the #style/Theme.AppCompat.Light theme. supportRequestWindowFeature(Window.FEATURE_NO_TITLE) is called before setContentView(). I never make any call to either getSupportActionBar().show() or hide().
So, what's the expected behavior? When I used ABS a call to requestWindowFeature(Window.FEATURE_NO_TITLE) would hide the titlebar/actionbar regardless of Android version.
How would I go about having an android app where some activies use an actionbar while others have none? Should they not extend the same base class?

So I've found a solution to this but it uses styles applied via the AndroidManifest (and therefore needs no code). Keep in mind that this will almost definitely only work if you're using the AppCompat library.
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="..."
android:versionCode="1"
android:versionName="1.0">
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="19" />
<application
android:allowBackup="false"
android:icon="#drawable/launcher"
android:label="#string/app_name"
android:theme="#style/Theme.AppCompat.Light.DarkActionBar">
<activity
android:label="#string/log_in"
android:name=".activities.LogInActivity"
android:parentActivityName=".activities.MainActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".activities.MainActivity" />
</activity>
<activity
android:label="#string/app_name"
android:name=".activities.MainActivity"
android:theme="#style/Theme.AppCompat.Light.NoActionBar">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:label="#string/sign_up"
android:name=".activities.SignUpActivity"
android:parentActivityName=".activities.MainActivity">
<meta-data
android:name="android.support.PARENT_ACTIVITY"
android:value=".activities.MainActivity" />
</activity>
</application>
</manifest>
Note how I've got a global theme applied directory to the <application> tag, and then also a theme that's individually applied to my MainActivity class through its own <activity> tag. That is the only Activity where I want the Action Bar to be hidden; everywhere else I want it to be visible (which is why I don't have individual themes applied to any of my other Activities as I instead let them inherit from the global application theme).
But you'll quickly find that Theme.AppCompat.Light.NoActionBar doesn't actually exist. This is because I had to create that style myself, which requires two different styles.xml files:
values/styles.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.AppCompat.Light.NoActionBar" parent="Theme.AppCompat.Light">
<item name="windowActionBar">false</item>
<item name="android:windowNoTitle">true</item>
</style>
</resources>
values-v11/styles.xml
<?xml version="1.0" encoding="utf-8"?>
<resources>
<style name="Theme.AppCompat.Light.NoActionBar" parent="Theme.AppCompat.Light">
<item name="android:windowActionBar">false</item>
<item name="android:windowNoTitle">true</item>
</style>
</resources>
You must use two different styles.xml files for this as the android:windowActionBar flag didn't exist before Android API version 11.

How to hide the title bar in a particular activity style by overriding the Application Style

I want to override a application theme on a particular activity, but its not working for me
This is code on my Manifest.xml:
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/Theme.Sherlock.Light" >
<activity
android:theme="#style/MyTheme"
android:name="com.ssdevnet.Splash"
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="com.ssdevnet.Home"
android:label="#string/app_name" />
</application>
And this is what i used in style:
<style name="MyTheme" parent="Theme.Sherlock.Light.DarkActionBar">
<item name="android:windowNoTitle">true</item>
</style>
and its still not working on Android 2.3.6 or below but working on 3 and above.
Also i tried to use this on the oncreate method on class file for that particular page:
requestWindowFeature(Window.FEATURE_NO_TITLE);// Removes title bar
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN); // Removes notification bar
but its not working on my phone running Android 2.3.6 but its working on Emulator running Jellybean and i need something that works on all the versions.
And I need to know some things as i am a newbie to android:
Can we define a Global theme, and override that theme on some activities? if yes, what method can we use?
Or we have to define theme for every activity if we are targeting activities instead of app?
I also want to learn about deploying the custom themes in the app.. if there are some good tutorials and references please share.
Thanks in Advance!

Try using setTheme(..) before calling setContentView(...) and super.oncreate() and it should work fine in the Activity.
Check out the Android developer's site for more information.