logo
down
shadow

NullPointerExcpetion on findViewById


NullPointerExcpetion on findViewById

Content Index :

NullPointerExcpetion on findViewById
Tag : java , By : MK.
Date : November 24 2020, 09:00 AM

will help you selectLesson selectLesson = new selectLesson(); is not a proper way to instantiate an Activity in Android. Read more about it here: http://developer.android.com/training/basics/firstapp/starting-activity.html
BUT, in your case you might actually want to move the logic from selectLesson class into MainActivity and just call the nextlesson() method from there.

Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Java arrays - Keep getting NullPointerExcpetion


Tag : java , By : Anthony Eden
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You never instantiate your array enemy.
At some point, before you use enemy, you'll need something like: enemy = new Enemy[numEnemies];. You can do it in the declaration:
// use a constant for the number of enemies:
public static final int NUM_ENEMIES = 20; 
Enemy enemy[] = new Enemy[NUM_ENEMIES];

Fabric For Android Studio threw an unchaught NullPointerExcpetion


Tag : android , By : user105769
Date : March 29 2020, 07:55 AM
This might help you I'm using Fabric with both Android Studio and Eclipse, and the plugin was really an easy tool, From a couple of weeks the Plugin for Android Studio is not working any more, I have tried to install/uninstall several times with no success, this mainly happened after the plugin is moved into Repositories. Every time on the start up of Android Studio there is a floating message says , I have contacted Fabric support and that was their reply

NullPointerExcpetion when updating database


Tag : android , By : orneka
Date : March 29 2020, 07:55 AM
With these it helps so i have this app i'm trying to make that requires updating the database it's using, but it keeps giving me this error:
SQLiteDatabase db = this.getWritableDatabase();
    final String COLUMN_NAME = "Enyes";
    final String WHERE_CLAUSE = "_id = '" + id + "'";
    ContentValues values = new ContentValues();
    values.put(COLUNM_NAME, num);
    db.update(TABLE_NAME, values, WHERE_CLAUSE, null);

    Cusror cursor = db.rawQuery("SELECT " + COLUMN_NAME + " FROM " + TABLE_NAME + "WHERE _id ='" + id "'");

    cursor.moveToFirst();
    Log.e(COLUMN_NAME, cursor.getString(0));

findViewById in RecyclerView ViewHolder throws NullPointerExcpetion


Tag : java , By : Vinicios
Date : March 29 2020, 07:55 AM
hop of those help? You need to initialize views in your ItemViewHolder before using them. Right now frag_name.findViewById(R.id.recycler_name) will throw NullPointerException cause your trying to use wrong view to findViewById().
Use this code:
public ItemViewHolder(@NonNull View itemView) {
        super(itemView);
        frag_name = itemView.findViewById(R.id.recycler_name);
        frag_price = itemView.findViewById(R.id.recycler_price);
        frag_date = itemView.findViewById(R.id.recycler_date);
    }

Is it equivalent to call getActivity().findViewById instead of <any_inflated_layout>.findViewById in a fragment?


Tag : android , By : Juice
Date : March 29 2020, 07:55 AM
I wish this helpful for you In my fragment's onCreateView method, I used to store the inflated layout in a variable and then pass the latter to my other functions that called findViewById on this inflated View. ,
In terms of RAM or CPU consumption
Related Posts Related QUESTIONS :
  • How to identify the missing type id in Jackson error?
  • android data binding error: cannot find symbol
  • Spring Boot application with a jar dependency does not run after maven build
  • Spring Data JPA query , filter ? search engine ? JPQL?
  • Why LiveData returns null in ViewModel?
  • what this line of code mean....new URLClassLoader(new URL[0],getClass().getClassLoader());
  • Why do need to use new Random() instead of just Random Randomnum?
  • I want to access zk components from the java file
  • How do I cast FieldValue.serverTimestamp() to Kotlin/Java Date Class
  • Insertion Sort Double Array with User Input - JAVA
  • Creating 2 dimesional array with user input and find sum of specific columns
  • can not get Advertising ID Provider in android
  • Convert list of Objects to map of properties
  • How to represent an undirected weighted graph in java
  • Return values as array from collection
  • ByteBuddy generic method return cast to concrete type
  • ImageView hides the round corners of the parent
  • Is there a way to find setter method by its getter method or vice versa in a class?
  • Get aggregated list of properties from list of Objects(Java 8)
  • Unable to find a document in Mongodb where exact date match in java
  • UsernamePasswordAuthenticationFilter skips success handler
  • Use Java filter on stream with in a stream filter
  • Default Login not successful in spring boot 2.1.7
  • Adding key value pairs from a file to a Hashmap
  • Rub regex: matching a char except when after by another char
  • Convert Base64 String to String Array
  • Escape Unicode Character 'POPCORN' to HTML Entity
  • An empty JSON field which is a boolean/nullable field in Java model, is getting converted as null
  • Mongo java driver cannot find public constructor for interface
  • How to unit test writing a file to AWS Lambda output stream?
  • How to make a GitHub GraphQL API Call from Java
  • What's the difference between @ComponentScan and @Bean in a context configuration?
  • Expected class or package adding a view using a class
  • can be delete of a element in a static array be O(1)?
  • Instance variable heap or stack ? ( with specific example)
  • Assert progress of ProgressBar in Espresso test
  • How to detect if gson.fromjson() has excess elements
  • I cant generate the proper code to select the a specific filter on a BI dashboard I am working on
  • How to Inject Dependencies into a Servlet Filter with Spring Boot Filter Registration Bean?
  • Thrift types as a Generic
  • Effective algorithm to random 4 unique integers less than a big max such as 100_000
  • Combining or and negation in Java regex?
  • Unable to instantiate default tuplizer Exception
  • Multi-tenant migration to work with quarkus
  • Ignite persisting a Set: Cannot find metadata for object with compact footer
  • Maven cannot resolve Jacob dependency using eclipse
  • testcontainers oracle database container starts before database user is created
  • Launching two spring boot apps in integration test
  • Is there a way to add a HashMap's value that is a integer array into a ArrayList?
  • Is there any way that I can get a parameter in paintComponent?
  • Empty stack with one recursive method and one iterative method
  • What's the behavior of onBackpressureBuffer in RxJava2
  • Java regex can only use 1 quantifier in a lookback (need 2)
  • How to fix error in native query : it is showing syntax error near or at
  • How to retrieve nested object from a document and display it in FirestoreRecyclerOptions?
  • Why not use ListIterator for full LinkedList Operation?
  • Android Webview EvaluateJavascript sometimes does not return a response
  • Matcher java doesn't work but regex seems to be good
  • Finding dimensions of a .gif file
  • Java Number format how to change +/- sign to custom text
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com