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];
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Fabric For Android Studio threw an unchaught NullPointerExcpetion
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
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NullPointerExcpetion when updating database
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));
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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);
}
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Is it equivalent to call getActivity().findViewById instead of <any_inflated_layout>.findViewById in a fragment?
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
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