This Activity already has an action bar supplied by the window decor

Android builders often brush the irritating communication “This Act already has an act barroom equipped by the framework decor.” This mistake sometimes arises once trying to adhd a customized act barroom oregon toolbar to an act that already possesses 1, starring to conflicts and sudden behaviour. Knowing the underlying causes and implementing effectual options is important for creating polished and useful Android purposes. This usher delves into the intricacies of this communal content, offering actionable methods to resoluteness it and forestall early occurrences.

Knowing the Mistake: “This Act already has an act barroom provided by the framework decor”

This mistake communication signifies a struggle successful your act’s format. By default, about themes mechanically see an act barroom supplied by the framework decorations. Once you effort to adhd different act barroom, both programmatically oregon done your XML structure, this struggle arises. The scheme tin’t negociate 2 act bars concurrently, ensuing successful this mistake and possibly disrupting the UI.

Communal eventualities triggering this mistake see including a Toolbar component to an act already utilizing a themed act barroom oregon inadvertently together with aggregate Toolbar declarations successful your format information. Figuring out the base origin is the archetypal measure in the direction of resolving the struggle.

Options and Champion Practices

Resolving the “This Act already has an act barroom” mistake entails a fewer cardinal methods:

1. Distance Duplicate Act Bars: Cautiously reappraisal your act’s structure record (usually activity_main.xml oregon akin) and guarantee location’s lone 1 act barroom component immediate. If you discovery aggregate Toolbar components oregon another act barroom declarations, distance the redundant ones. This frequently solves the job straight.
2. Disable the Default Act Barroom: If you mean to usage a customized Toolbar, you essential disable the default act barroom supplied by the subject. You tin accomplish this successful your act’s onCreate() technique by calling getSupportActionBar().fell(); oregon by mounting requestWindowFeature(Framework.FEATURE_NO_TITLE); earlier calling setContentView().
3. Usage NoActionBar Subject: A much imperishable resolution is to control to a “NoActionBar” subject. This prevents the default act barroom from being created successful the archetypal spot, eliminating the possible for struggle. You tin use this subject successful your AndroidManifest.xml record inside the <application></application> oregon <activity></activity> tag.

Implementing a Customized Toolbar

Erstwhile you’ve resolved the struggle, implementing a customized Toolbar is easy:

• See the Toolbar component successful your act’s format record.
• Successful your act’s onCreate() technique, discovery the Toolbar utilizing findViewById().
• Fit the Toolbar arsenic the act’s activity act barroom utilizing setSupportActionBar().

This procedure permits you afloat power complete the quality and performance of your act barroom, enabling customization to lucifer your exertion’s branding and person education necessities.

Stopping Early Conflicts

Proactive measures tin forestall this mistake from occurring successful the archetypal spot. Cautiously reappraisal your format information and guarantee lone 1 act barroom is declared. Adopting accordant naming conventions for format parts tin besides aid debar disorder and unintentional duplication. Once running with antithetic themes, wage adjacent attraction to the act barroom settings to keep consistency crossed your exertion.

For additional speechmaking connected Android app improvement champion practices, cheque retired the authoritative Android Builders documentation: Android Builders

Different utile assets for UI plan concerns is Worldly Plan pointers: Worldly Plan

Often Requested Questions

Q: Wherefore does my app clang last implementing the getSupportActionBar().fell(); methodology?

A: This mightiness happen if you are calling getSupportActionBar() earlier setContentView() successful your onCreate() technique. Guarantee setContentView() is known as archetypal to initialize the act’s position hierarchy.

By knowing the base causes of the “This Act already has an act barroom” mistake and implementing the options outlined successful this usher, you tin make strong and visually interesting Android purposes. Retrieve to prioritize broad and concise structure plan, adhere to Android improvement champion practices, and totally trial your exertion to guarantee a seamless person education. Larn much suggestions and methods connected our weblog: anchor matter.

This blanket usher provides assorted approaches to sort out and forestall act barroom conflicts successful your Android initiatives. Using these methods empowers you to make a refined and person-affable app, escaped from irritating UI points. For much precocious Android improvement assets, seek the advice of Stack Overflow. Retrieve to trial your exertion completely last implementing immoderate of these options to guarantee optimum show and stableness.

Question & Answer :
Making an attempt to decision complete my material to usage Toolbar alternatively of act barroom however I support getting an mistake saying

java.lang.RuntimeException: Incapable to commencement act ComponentInfo{com.tyczj.weddingalbum/com.xxx.xxx.MainActivity}: java.lang.IllegalStateException: This Act already has an act barroom provided by the framework decor. Bash not petition Framework.FEATURE_ACTION_BAR and fit windowActionBar to mendacious successful your subject to usage a Toolbar alternatively. astatine android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180) astatine android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230) astatine android.app.ActivityThread.entree$600(ActivityThread.java:141) astatine android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234) astatine android.os.Handler.dispatchMessage(Handler.java:ninety nine) astatine android.os.Looper.loop(Looper.java:137) astatine android.app.ActivityThread.chief(ActivityThread.java:5039) astatine java.lang.indicate.Technique.invokeNative(Autochthonal Technique) astatine java.lang.indicate.Technique.invoke(Methodology.java:511) astatine com.android.inner.os.ZygoteInit$MethodAndArgsCaller.tally(ZygoteInit.java:793) astatine com.android.inner.os.ZygoteInit.chief(ZygoteInit.java:560) astatine dalvik.scheme.NativeStart.chief(Autochthonal Methodology) Precipitated by: java.lang.IllegalStateException: This Act already has an act barroom equipped by the framework decor. Bash not petition Framework.FEATURE_ACTION_BAR and fit windowActionBar to mendacious successful your subject to usage a Toolbar alternatively. astatine android.activity.v7.app.ActionBarActivityDelegateBase.setSupportActionBar(ActionBarActivityDelegateBase.java:one hundred sixty five) astatine android.activity.v7.app.ActionBarActivity.setSupportActionBar(ActionBarActivity.java:ninety two) astatine com.xxx.xxx.MainActivity.onCreate(MainActivity.java:113) astatine android.app.Act.performCreate(Act.java:5104) astatine android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080) astatine android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)             astatine android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)             astatine android.app.ActivityThread.entree$600(ActivityThread.java:141)             astatine android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)             astatine android.os.Handler.dispatchMessage(Handler.java:ninety nine)             astatine android.os.Looper.loop(Looper.java:137)             astatine android.app.ActivityThread.chief(ActivityThread.java:5039)             astatine java.lang.indicate.Methodology.invokeNative(Autochthonal Methodology)             astatine java.lang.indicate.Technique.invoke(Technique.java:511)             astatine com.android.inner.os.ZygoteInit$MethodAndArgsCaller.tally(ZygoteInit.java:793)             astatine com.android.inner.os.ZygoteInit.chief(ZygoteInit.java:560)             astatine dalvik.scheme.NativeStart.chief(Autochthonal Methodology) 

truthful past I added successful my kind for my act to person nary actionbar

<kind sanction="AppCompatTheme" genitor="@kind/Subject.AppCompat.Airy"> <point sanction="android:windowActionBar">mendacious</point> </kind> 

and the subject is applies to activties successful my manifest

<act android:sanction=".MainActivity" android:windowSoftInputMode="adjustResize|stateHidden" android:subject="@kind/AppCompatTheme" android:screenOrientation="picture"/> 

MainActivity extends GooglePlayServiceActivity truthful I besides fit the subject location excessively

<act android:sanction=".GooglePlayServicesActivity" android:description="@drawstring/title_activity_google_play_services" android:subject="@kind/AppCompatTheme"> 

however I inactive acquire the mistake. I besides bash not petition framework characteristic anyplace. immoderate ideas wherefore I inactive acquire this?

I deliberation you’re processing for Android Lollipop, however anyhow see this formation:

<point sanction="windowActionBar">mendacious</point> 

to your subject declaration wrong of your app/src/chief/res/values/types.xml.

Besides, if you’re utilizing AppCompatActivity activity room of interpretation 22.1 oregon larger, adhd this formation:

<point sanction="windowNoTitle">actual</point> 

Your subject declaration whitethorn expression similar this last each these additions:

<!-- Basal exertion subject. --> <kind sanction="AppTheme" genitor="Subject.AppCompat.Airy.DarkActionBar"> <!-- Customise your subject present. --> <point sanction="colorPrimary">@colour/colorPrimary</point> <point sanction="colorPrimaryDark">@colour/colorPrimaryDark</point> <point sanction="colorAccent">@colour/colorAccent</point> <point sanction="windowActionBar">mendacious</point> <point sanction="windowNoTitle">actual</point> </kind>