You need to use a Theme AppCompat theme or descendant with this activity

Question

Android Studio 0 4 5  Android documentation for creating custom dialog boxes  http   developer android com guide topics ui dialogs html  If you want a custom dialog  you can instead display an Activity as a dialog instead of using the Dialog APIs  Simply create an activity and set its theme to Theme Holo Dialog in  the  lt activity gt  manifest element    lt activity android theme   android style Theme Holo Dialog   gt    However  when I tried this I get the following exception   java lang IllegalStateException  You need to use a Theme AppCompat theme  or descendant  with this activity   I am supporting the following  and I can t using something greater than 10 for the min   minSdkVersion 10 targetSdkVersion 19   In my styles I have the following    lt  -- Base application theme  -- gt       lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt    And in my manifest I have this for the activity     lt application         android allowBackup  true          android icon   drawable ic launcher          android label   string app name          android theme   style AppTheme   gt           lt activity             android theme   android style Theme Holo Light Dialog              android name  com ssd register Dialog update              android label   string title activity dialog update   gt           lt  activity gt    Creating the dialog box like this was something I was hopping to do  as I have already completed the layout   Can anyone tell me how I can get around this problem

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I had the same problem  but it solved when i put this on manifest  android theme   style Theme AppCompat        lt application         android allowBackup  true          android icon   drawable icon          android label   string app name test          android supportsRtl  true          android theme   style Theme AppCompat  gt                         lt  application gt

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Change Theme from highlighted tab in picture

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This one worked for me    lt application            android allowBackup  true             android icon   mipmap ic launcher             android label   string app name             android theme   style AppTheme   gt              lt activity                android name   MainActivity                 android label   string app name                 android theme   style Theme AppCompat NoActionBar  gt                   lt intent-filter gt                      lt action android name  android intent action MAIN    gt                       lt category android name  android intent category LAUNCHER    gt                  lt  intent-filter gt              lt  activity gt   lt  application gt

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I had such crash on Samsung devices even though the activity did use Theme AppCompat  The root cause was related to weird optimizations on Samsung side   - if one activity of your app has theme not inherited from Theme AppCompat - and it has also  android launchMode  singleTask   - then all the activities that are launched from it will share the same Theme   My solution was just removing android launchMode  singleTask

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If you need to extend ActionBarActivity you need on your style xml    lt  -- Base application theme  -- gt   lt style name  AppTheme  parent  AppTheme Base   gt    lt style name  AppTheme Base  parent  Theme AppCompat Light DarkActionBar  gt       lt  -- Customize your theme here  -- gt    If you set as main theme of your application as android Theme Material Light instead of AppTheme Base then you   ll get an    IllegalStateException You need to use a Theme AppCompat theme  or descendant  with this activity    error

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min sdk is 10  ActionBar is available from api level 11  So for 10 you would be using AppCompat from the support library for which you need to use Theme AppCompat or descendant of the same   Use  android theme   style Theme AppCompat   gt    Or if you dont want action bar at the top  android theme   style Theme AppCompat NoActionBar  gt    More info    http   developer android com guide topics ui actionbar html  Edit   I might have misread op post   Seems op wants a Dialog with a Activity Theme  So as already suggested by Bobbake4 extend Activity instead of ActionBarActivity   Also have a look   Dialog Attributes in the link below  http   grepcode com file repository grepcode com java ext com google android android 4 4 r1 frameworks base core res res values themes xml

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I was getting this same problem  Because i was creating custom navigation drawer  But i forget to mention theme in my manifest like this  android theme   style Theme AppCompat NoActionBar    As soon i added the above the theme to my manifest it resolved the problem

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For me none of the above answers worked even after I had Theme AppCompat as my base theme for the application  I was using com android support design 24 1 0 So I just changed the version to 24 1 1  After the gradle sync  Its working again and the exception went away  Seems to me the issue was with some older versions of design support libraries   Just putting this here in case other answers don t work for some people

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In my case i have no values-v21 file in my res directory  Then i created it and added in it following codes      lt style name  AppTheme  parent  Theme AppCompat Light NoActionBar  gt       lt  -- Customize your theme here  -- gt       lt item name  colorPrimary  gt  color colorPrimary lt  item gt       lt item name  colorPrimaryDark  gt  color colorPrimaryDark lt  item gt       lt item name  colorAccent  gt  color colorAccent lt  item gt   lt  style gt

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In your app build gradle add this dependency   implementation  com google android material material 1 1 0-alpha03     Update your styles xml AppTheme s parent    lt style name  AppTheme  parent  Theme MaterialComponents Light NoActionBar   gt

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You have many solutions to that error    You should use Activity or FragmentActivity instead of ActionbarActivity or AppCompatActivity If you want use ActionbarActivity or AppCompatActivity  you should change in styles xml Theme Holo xxxx to Theme AppCompat Light  if necessary add to DarkActionbar    If you don t need advanced attributes about action bar or AppCompat you don t need to use Actionbar or AppCompat

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In my case  I was using a style called  FullScreenTheme   and although it seemed to be correctly defined  it was a descendant of Theme AppCompat  it was not working   I finally realized that I was using an AAR library that internally also had defined a style called  FullScreenTheme  and it was not descendant of Theme AppCompat  The clashing of the names was causing the problem   Fix it by renaming my own style name so now Android is using the correct style

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Your Activity is extending ActionBarActivity which requires the AppCompat theme to be applied  Change from ActionBarActivity to Activity or FragmentActivity  it will solve the problem       If you use no Action bar then     android theme   android style Theme Light NoTitleBar Fullscreen

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for me was solution to use ContextThemeWrapper   private FloatingActionButton getFAB     Context context   new android support v7 view ContextThemeWrapper getContext    R style AppTheme   FloatingActionButton fab   new FloatingActionButton context   return fab     from Android - How to create FAB programmatically

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If you are struggling with the Recyclerview Adapter class then use view getRootView   getContext    instead of getApplicationContext   or activity this

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For me issue resolved by changing the inheritance from AppCompatActivity to Activity in my customDialog class  No changes required in manifest for Theme Dialog

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just make that      getApplicationContext   getTheme   applyStyle R style Theme Mc    true     and In your values styles xml  add this     lt style  name  Theme Mc  parent  Theme AppCompat Light NoActionBar  gt            lt  -- ADD Your Styles  -- gt          lt  style gt

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If you are using the application context  like this   final AlertDialog Builder builder   new AlertDialog Builder getApplicationContext       change it to an activity context like this   final AlertDialog Builder builder   new AlertDialog Builder MainActivity this

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In Android manifest just change theme of activity to AppTheme as follow code snippet   lt activity   android name   MainActivity    android label   string app name    android theme   style AppTheme  gt   lt  activity gt

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I had an activity with theme  lt android theme   android style Theme Dialog  gt  used for showing dialog in my appWidget and i had same problem  i solved this error by changing activity code like below    Override protected void onCreate Bundle savedInstanceState        setTheme R style Theme AppCompat Dialog     this line i added     super onCreate savedInstanceState       setContentView R layout activity dialog

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Copying answer from  MarkKeen in the comments above as I had the same problem   I had the error stated at the top of the post and happened after I added an alert dialog  I have all the relevant style information in the manifest  My problem was cured by changing a context reference in the alert builder - I changed    new android support v7 app AlertDialog Builder getApplicationContext      to    new android support v7 app AlertDialog Builder this    And no more problems

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In my experiences the problem was the context where I showed my dialog  Inside a button click I instantiate an AlertDialog in this way   builder   new AlertDialog Builder getApplicationContext       But the context was not correct and caused the error  I ve changed it using the application context in this way   In declare section   Context mContext    in the onCreate method  mContext   this    And finally in the code where I need the AlertDialog   start stop    Button  findViewById R id start stop   start stop setOnClickListener  new View OnClickListener                           Override                 public void onClick View v                                        if   is running                                                builder   new AlertDialog Builder mContext                           builder setMessage  MYTEXT                                    setCancelable false                                   setPositiveButton  SI   new DialogInterface OnClickListener                                         public void onClick DialogInterface dialog  int id                                        Task Started   false                                      startTask                                                                                                              setNegativeButton  NO                                           new DialogInterface OnClickListener                                         public void onClick DialogInterface dialog  int id                                            dialog cancel                                                                                                      AlertDialog alert   builder create                            alert show                                                    This is the solution for me

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Change your theme style parent to    parent  Theme AppCompat    This worked for me

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For me  the Android SDK didn t seem to be able to find the styles definition  Everything was wired correctly and doing a simple project clean fixed it for me

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All you need to do is add android theme   style Theme AppCompat Light  to your application tag in the AndroidManifest xml file

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In Android Studio  Add support library to the gradle file and sync  Edit build gradle Module app  to have dependencies as follows   dependencies       compile fileTree dir   libs   include      jar        testCompile  junit junit 4 12      implementation  com android support appcompat-v7 23 1 1      implementation  com android support design 23 1 1      implementation  com android support support-v4 23 1 1      My support Library version is 23 1 1  use your support library version as applicable

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Make sure you are using an activity context while creating a new Alert Dialog and not an application or base context

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Change the theme of the desired Activity  This works for me    lt activity             android name  HomeActivity              android screenOrientation  landscape              android theme   style Theme AppCompat Light              android windowSoftInputMode  stateHidden    gt

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This is when you want a AlertDialog in a Fragment               AlertDialog Builder adb   new AlertDialog Builder getActivity                 adb setTitle  My alert Dialogue  n                adb setPositiveButton  OK   new DialogInterface OnClickListener                     public void onClick DialogInterface dialog  int which                         some code                                adb setNegativeButton  Cancel   new DialogInterface OnClickListener                     public void onClick DialogInterface dialog  int which                      dialog dismiss                                       adb show

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In my case  I had AppTheme in AndroidManifest set correctly to a style that inherited from Theme AppCompat  However  the individual activities had style settings in AndroidManifest that were overriding that

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for me a solution  after trying all solutions from here  was to change       lt activity         android name  com github cythara MainActivity          android label  Main  gt       lt  activity gt    to include a theme        lt activity         android name  com github cythara MainActivity          android theme   style Theme AppCompat NoActionBar          android label  Main  gt       lt  activity gt

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First of all  add this as import   gt  import androidx appcompat app AlertDialog I am posting this being the smallest ever solution to the problem  I just changed the instantiation of new AlertDialog Builder mContex  to new AlertDialog Builder mContext  R style PreferenceDialogLight  Where  lt style name  quot PreferenceDialogLight quot  parent  quot Base Theme MaterialComponents Dialog Alert quot  gt

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I was experiencing this problem even though my Theme was an AppCompat Theme and my Activity was an AppCompatActivity  or Activity  as suggested on other s answers   So I cleaned  rebuild and rerun the project     Build -  Clean Project   Build -  Rebuild Project   Run -  Run   It may seem dumb  but now it works great   Just hope it helps

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I had this problem as well and what I did to fix it  AND still use the Holo theme was to take these steps   first I replaced this import   import android support v7 app AppCompatActivity    with this one   import android app Activity    then changed my extension from   public class MyClass extends AppCompatActivity          to this   public class MyClass extends Activity          And also had to change this import   import android support v7 app AlertDialog    to this import   import android app AlertDialog    and then you can use your theme tag in the manifest at the activity level   android theme   android style Theme Holo Dialog    gt    and lastly   unless you have other classes in your project that has to use v7 appCompat  you can either clean and rebuild your project or delete this entry in the gradle build file at the app level   compile  com android support appcompat-v7 23 2 1    if you have other classes in your project that has to use v7 appCompat then just clean and rebuild the project

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In my case  i was inflating a view with ApplicationContext  When you use ApplicationContext  theme style is not applied  so although there was Theme Appcompat in my style  it was not applied and caused this exception  More details  Theme Style is not applied when inflater used with ApplicationContext

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If using getApplicationContext   as the parameter while inflating the layout  you can try to use getBaseContext   instead  e g        View inflate getBaseContext                getLayoutId      0   R layout page default   getLayoutId                null

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NOTE  I had intended this as an answer  but further testing reveals it still fails when built using maven from the command line  so I ve had to edit it to be a problem   -   In my case when I got this error I was already using a AppCompat Theme and the error didn t make much sense   I was in the process of mavenizing my android build  I had already dependencies on the apklib and jar versions of app compat  thus        lt  -- See https   github com mosabua maven-android-sdk-deployer -- gt           lt dependency gt               lt groupId gt android support lt  groupId gt               lt artifactId gt compatibility-v7-appcompat lt  artifactId gt               lt version gt   compatibility version  lt  version gt               lt type gt apklib lt  type gt           lt  dependency gt            lt dependency gt               lt groupId gt android support lt  groupId gt               lt artifactId gt compatibility-v7-appcompat lt  artifactId gt               lt type gt jar lt  type gt           lt  dependency gt            lt dependency gt               lt groupId gt android support lt  groupId gt               lt artifactId gt compatibility-v7 lt  artifactId gt               lt type gt jar lt  type gt           lt  dependency gt            lt dependency gt               lt groupId gt android support lt  groupId gt               lt artifactId gt compatibility-v4 lt  artifactId gt           lt  dependency gt    Now  when I import the maven project and build and run from IntelliJ it s fine   But when I build and deploy and run from the command line with maven I still get this exception

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This really forced me to post my own answer   Since i am using Theme AppCompat Light NoActionBar  and also replaced all AlertDialog instances with support compatibility imports and still faced problems below v21  Lollipop    I didn t like idea of changing theme which was proper  So after 2 days  I finally gave some thought about the other libraries that are specifying AppTheme for their AndroidManifest xml   I found out that there is yet another one  Paytm Checkout SDK   Thus  the following changes fixed the problem    Renaming AppTheme using for my app to  XYZAppTheme  using tools replace method in AndroidManifest of my project app        lt uses-permission android name  android permission INTERNET    gt    lt application     android name   XYZ      android allowBackup  true      android icon   mipmap ic launcher v2      android label   string app name      android largeHeap  true      android roundIcon   mipmap ic launcher v2 round      android supportsRtl  true      android theme   style XYZAppTheme      tools replace  android icon android theme  gt        lt activity         android name   xyz SplashActivity          android launchMode  singleTask          android screenOrientation  portrait  gt           lt intent-filter gt               lt action android name  android intent action MAIN    gt                lt category android name  android intent category LAUNCHER    gt           lt  intent-filter gt       lt  activity gt

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In case anybody still wondering about this issue   try this     new android support v7 app AlertDialog Builder this

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When You re Using Kotlin  nothing solved my problem until I change the Builder parameter from  applicationContext  to  this    This  Does Not Work  val dialogDelete   AlertDialog Builder applicationContext               setTitle  Confirmation                setMessage  Delete this photo                 setNegativeButton android R string no   it  which - gt                  it dismiss                 dialogDelete show     Following Code Works  val dialogDelete   AlertDialog Builder this               setTitle  Confirmation                setMessage  Delete this photo                 setNegativeButton android R string no   it  which - gt                  it dismiss                 dialogDelete show

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go to your styles and put the parent  parent  Theme AppCompat    instead of   parent   android style Theme Holo Light

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This solution worked for me    Design library depends on the Support v4 and AppCompat Support Libraries  so don t use different version for appcompat and design library in gradle   use    compile  com android support appcompat-v7 23 0 0   compile  com android support design 23 0 0    instead of   compile  com android support appcompat-v7 23 0 0   compile  com android support design 23 1 0

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You have came to this because you want to apply Material Design in your theme style in previous sdk versions to 21  ActionBarActivity requires AppThemeso if you also want to prevent your own customization about your AppTheme  only you have to change in your styles xml  previous to sdk 21  so this way  can inherit for an App Compat theme    lt style name  AppTheme  parent  android Theme Holo Light DarkActionBar  gt    for this    lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt

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The reason you are having this problem is because the activity you are trying to apply the dialog theme to is extending ActionBarActivity which requires the AppCompat theme to be applied    Update  Extending  AppCompatActivity would also  have this problem   In this case  change the Java inheritance from ActionBarActivity to Activity and leave the dialog theme in the manifest as it is  a non Theme AppCompat value     The general rule is that if you want your code to support older versions of Android   it should have the AppCompat theme and the java code should extend AppCompatActivity  If you have  an activity that doesn t need this support  such as you only care about the latest versions and features of Android  you can apply any theme to it but the java code must extend plain old Activity     NOTE  When change from AppCompatActivity  or a subclass  ActionBarActivity   to Activity  must also change the various calls with  support  to the corresponding call without  support    So  instead of getSupportFragmentManager  call getFragmentManager

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Do not forget to clean the project after VCS Local History restore

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Just Do  new AlertDialog Builder this    Instead of  new AlertDialog Builder getApplicationContext

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For my Xamarin Android project  in MainActivity cs   I changed     public class MainActivity   global  Xamarin Forms Platform Android FormsAppCompatActivity   to  public class MainActivity   global  Xamarin Forms Platform Android FormsApplicationActivity      and the error went away  I realise that isn t a solution for everyone but it might give a clue to the underlying problem

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This is what fixed it for me  instead of specifying the theme in manifest  I defined it in onCreate for each activity that extends ActionBarActivity    Override protected void onCreate Bundle savedInstanceState        setTheme R style MyAppTheme       super onCreate savedInstanceState       setContentView R layout my activity layout           Here MyAppTheme is a descendant of Theme AppCompat  and is defined in xml  Note that the theme must be set before super onCreate and setContentView

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Instead of all of this  about changing a lot of this in your app   just do it simple as this video does   https   www youtube com watch v Bsm-BlXo2SI  I already use it so    it s a 100 percent effective

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My Activity with SectionsPagerAdapter and ViewPager  amp  Fragment  public class MyActivity extends AppCompatActivity implements ActionBar TabListener               Override         public void onPostResume                super onPostResume                try                  getSupportActionBar   setDisplayShowTitleEnabled false                catch  NullPointerException ignored

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Quick solution   Change your base theme parent in styles xml  Replace from   lt style name  AppTheme  parent  Theme AppCompat Light DarkActionBar  gt    to   lt style name  AppTheme  parent  Theme AppCompat  gt

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In my case such issue was appear when i tried to show Dialog  The problem was in context  I ve use getBaseContext   which theoretically should return Activity context  but appears its not  or it return context before any Theme applied   So I just replaced getBaseContexts   with  this   and now it work as expected           Dialog showAlert this  title  message

[android] You need to use a Theme.AppCompat theme (or descendant) with this activity

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