Android getactionbar returns null after upgrading to sdk 21 i was working on a new app in android studio beta with target sdk 20. The action bar appears at the top of an activitys window when the activity uses the appcompat s appcompat theme or one of its descendant themes. I have learnt already in the previous article, how to create list view in android by recyclerview. Okay, repo is committed and ready to be downloaded. Toolbar was introduced in material design in api level 21 android 5. Google has released an updated support library androidsupportv7appcompat which includes official support for the. You need to call getsupportactionbar on an actionbaractivity. Ill be replacing bandhook action bar while writing this post, so there may be. Returns the current actionbar subtitle in standard mode.
Download the action bar icon set and select the required icons and add them to the project. Material design brings lot of new features in android that changed a. Jan 16, 20 sometimes getactionbar in my oncreate method returns null. By continuing to use pastebin, you agree to our use of cookies as described in the cookies policy. But we use five primary attributes to customize overall theme. Appcompatactivity and actionbaractivity cause null reference. In design support library the components like navigation drawer, floating action button, snackbar, tabs, floating labels and animation frameworks were introduced. If you are using toolbar and appcompat then you probably have. And that is the reason i always get null pointer exception.
Appcompat family will contain an action bar by default. I tried using a ifelse statement to determine if the action bar was showing and is so then to hide it. Holo or one of its descendants in application manifest file. Once you have that reference, you can call any of the actionbar methods to adjust the app bar. Do not call getactionbar that is not available on older devices, and for the new r21 edition of appcompat v7, i would expect it to return null all the time, as the new actionbaractivity disables and replaces the system action bar. Do not call getactionbar that is not available on older devices, and for the new r21 edition of appcompatv7, i would expect it to return null all the time, as the new actionbaractivity disables and replaces the system action bar. Using the action bar offers your users a familiar interface across applications that the system gracefully adapts for different. So before you can add the action bar, you must set up your project with the appcompat v7 support library by following the instructions in the. Android setdisplayhomeasupenabled showing an arrow.
This is an awesome component to convert your jsonxml data to represent with a respective manner. Natty java getsupportactionbar in appcompatactivity cannot be applied to androidx. Google has released an updated support library androidsupportv7 appcompat which includes official support for the actionbar with gingerbread compatibility. However with the help of the new appcompat support library version 22. The code in this video gives me a nullpointer exception and causes the application to freeze upon installation.
The appcompat support library enables the use of the actionbar and material design specific implementations such as toolbar for older devices down to android v2. If this method returns false, the app should synthesize a new task stack by using taskstackbuilder or another similar mechanism to perform up navigation. Android getactionbar returns null after upgrading to sdk 21. Jun 07, 2016 however with the help of the new appcompat support library version 22. Supportactionbar returning null xamarin community forums. To use this, first, we need to upgrade to latest support library by opening the android sdk manager and verifying we have the latest android support library. Actionbar tabs with fragments codepath android cliffnotes. Can i replace actionbaractivity with appcompatactivity in a tabbed activity in android studio. Natty javascript how do i send a request with superagent that uses the same query parameter by. It was all well and good, but after updating target sdk version to 21 and appcompatv7 to 21. Android get support action bar always returns null stack overflow. Tips and tricks for android material support library. Toolbar is a viewgroup that can be placed at anywhere in the layout.
The action bar appears at the top of an activitys window when the activity uses the appcompats r. Jul 30, 20 after learning some basic rules to work with actionbarcompat, you will probably need to migrate some apps from actionbarsherlock to actionbarcompat, because it provides better integration with some other functionalities such as navigation drawer, and there are some issues that you must know to make it easy. When you call getactionbar on an actionbaractivity, you will receive a null object. To customise an actionbar first we need to configure the theme in the resvaluesstyles.
Android material design 2 good bay actionbar, hello. Update i had not mentioned anything about using toolbar with actionbaractivity. Build a facedetecting app with machine learning and. In android toolbar is similar to an actionbar now called as app bars. This is a wonderful example to show you, how to create an expandable list view in android. Action bar the action bar is a window feature that identifies the user location, and provides user actions and navigation modes. A limited holostyled action bar will be provided on platform versions older. After learning some basic rules to work with actionbarcompat, you will probably need to migrate some apps from actionbarsherlock to actionbarcompat, because it provides better integration with some other functionalities such as navigation drawer, and there are some issues that you must know to make it easy. As mentioned above, this guide focuses on how to use the actionbar apis in the support library. Expandable list view in android example legend blogs.
Actionbarin class activity when i update all of my sdk, my app always throw nullreferenceexception exception from this. To use the actionbar utility methods, call the activitys getsupportactionbar method. There are several ways to setup tabs with fragments. Android design support library made our day easier by providing backward compatibility to number of material design components all the way back to android 2.
Android custom action bar example tutorial journaldev. Classification is expressed as a probability value between 0. The system has recorded your request and will come up with examples later. Extended actionbar guide codepath android cliffnotes. This method returns a reference to an appcompat actionbar object. You have to settitle using collapsingtoolbarlayout. The problem is im getting a null pointer when the getactionbar is called. Standard actionbar tabs are not supported in gingerbread, so many people use actionbarsherlock when gingerbread must be supported. Reason for that is, original theme that came from manifest contains style windownotitle and actionbarsherlock or android 2. In my main activitys oncreate method i call getactionbar to setup my actionbar.
Posting to the forum is only allowed for members with active accounts. This might be a very obvious problem to someone, but for me the problem actually lead me to learn more about android application themes and. The following are top voted examples for showing how to use android. Can i replace actionbaractivity with appcompatactivity in. As for the left carat icon, take a look at this answer, which describes where to find it in the action bar icon pack which you will need to download. Jul 12, 2017 action bar is introduced in android 3. Copy each icon with all resolutions xxhdpi, xhdpi, hdpi, mdpi into respected folders in eclipse project under res. This might be a very obvious problem to someone, but for me the problem actually lead me to learn more about android application themes and styles, so i make this note. Following this answer, you can make any icon show up as white. Primarily actionbar contained the navigation iconelement. If you want to use the toolbar on devices with an earlier android release you can use the downport provided by the appcompat v7 support library. Appcompatactivity developer android android developers. What im saying is, the call to getsupportactionbar always returns null, in my code, and in the demo provided with the library.
If this method returns null the system can choose a way to present the mode or choose not to start the mode at all. If this method returns false the app can trivially call supportnavigateuptointent using the same parameters to correctly perform up navigation. New answers to old questions headquarters 20200408. Returns null if getnavigationmode would not return. Base class for activities that use the support library action bar features.
If youre looking for information about the contextual action bar for displaying contextual action items, see the menu guide. Android working with android actionbar theappguruz. Currently, new projects created through android studio incorporate this library by default. Action bar menus and splitactionbar using actionbarcompat. Actionbar was an important element after options menu which used to popup from the bottom with the press of options menu hardware button. When set to a nonnull value the getactionbar method will return an androidx. I am using formsappcompatactivity and setting custom toolbar into actionbar as below mentioned code formsappcompatactivity. In this tutorial we are going to learn how to develop android tab with swipe views, viewpager, fragmentpageradapter in android studio. Noactionbar, e nao setar o toolbar usando o setsupportactionbar ou setactionbar, ira ter problemas com nullpointerexception nas chamadas do getsupportactionbar ou getactionbar. In the article titled adding action items and overflow menu items to action bar in android, we have seen how to add action items and split action bar items to action bar in android. It does the same thing in my app code, which is similar. In the meanwhile, you may use the search function to quickly find examples for. There are two methods to add a back button on the toolbar. At this point, we now have replaced the default actionbar with our preferred layout and have complete control over its appearance.
If your application does not use action bar then no need use that method. The demo code is doing what you are saying, and it crashes with an npe. Can i replace actionbaractivity with appcompatactivity in a. Why are you not using our appcompat library and implementing your own. Sometimes getactionbar in my oncreate method returns null.
Android setdisplayhomeasupenabled showing an arrow instead. Jul 12, 2017 material design provides set of properties to customize the material design color theme. Toolbar tutorial with example in android studio android. We assume that you have a basic understanding of the actionbar component discussed in this tutorial. Android getactionbar returns null after upgrading to. Google has also released a support appcompatactivity class which can be used for compatible tabs. So now you can use expandablelistview component to create a list of parent and child relationship. We use cookies for various purposes including analytics. We are going to use android studio in this tutorial since it contains a template for creating actionbar tabs with viewpager. These examples are extracted from open source projects. Once you are done copying required icons, we will start adding the action items first.
To use the toolbar on such devices add a compile dependency to com. Appcompat v21 delivers an api and featureset that is uptodate with android 5. The following are jave code examples for showing how to use getsupportactionbar of the android. For those who face same problem please refere this answe. This little code segment let you add a back arrow also you can add another icon and gives it a click listener. Now i want to access my toolbar for manipulating the child views. In this tutorial we will create an app that consists of android custom action bar with a custom layout. Actionbar to your activity when running on api level 7 or higher by extending this class for your activity and setting the activity theme to androidx. If holo themes are available on the current platform version they will be used. It was all well and good, but after updating target sdk version to 21 and appcompat v7 to 21. Developer guides for information about how to use the action bar, including how to add action items, navigation modes and more, read the action bar api guide. Note that every activity that extends this class has to be themed with theme. I have implemented donebar two buttons in actionbar in preferenceactivity as provided in v20 sdk samples, but after updating sdk and appcompat to version 21 my app crashes at java. Gone are the days of gingerbread design, and if your app is holo, youre.
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