I’m still trying hard to read from a BLE device (laser meter) from an android (using java) Basically I’m trying to get which fields are those I’m interested into (aka the measures) So far i discovered 5 services (i found the usage here): 3ab10100-f831-4395-b29d-570977d5bf94 (I can’t fi…
Tag: android
read a File in hex byteArray and write part of that array to another File – java android
I have a 200kb file and I have to read it in bytes, and then write part of this byteArray (from index 90000 to 165000) to another file. How can I accomplish this. Answer Use a RandomAccessFile in order to seek to the offset to start copying from. For example:
Why cant I initialize the Webview
im just starting out with android studio, i have imported WebKit but those imports are grayed. and i cant initialize the webview “private WebView webview” shows errors how to do it correctly? Answer I was using kotlin instead of java that was the issue (beginner mistake lol) my issue was that i co…
MenuItem and toolbar missing in new activity Android Studio Unknown Bug
I am completely new to Android Studio and just learned Object-oriented programming. My project requires me to build something on open-source code. I added a new menu item to a menu and want to start another activity once the user clicks the menu item with id: plot. The intent will be sent from if (id == R.id.…
Arrays.asList() how to append String value to each item
I’m reading getting the names of all the images inside a subfolder of my assets folder. I then want to concat a String before each one. Is there a way to do it inside my method getPreviews with Array’s .asList() so I can avoid using the loop? Answer Arrays.asList doesn’t allow the creation o…
Android Studio ListView Only 1 Time Clickable
I created a class “users” and i add the some names. Next i created a ArrayAdapter for ListView and i connect them. But i wont items only one time clickable. I couldn’t. How can i, in listview items only once time clickable? Show it with a sample code please? Answer It can be done in a few wa…
Event Listener in Firestore doesn’t see field updates in documents inside collection. Android, Java
I have next firestore scheme: collection “users” – document user_id – collection “trips” – document trip_id – collection “requests” – document request_user_id with fields: and boolean field <is_accepted> On one of my pages I want to liste…
How to prevent saving empty data in SQLite database
I dont want to save empty data in my Note App. I have tried Everything but when I leave Edittexts empty it still saves data into my data base. what should I do? this is my insertNote method and this is the method that saves my notes in my AddNoteActivity i have also tried this but this is but this
How to remove everything from ListView using a button onClick?
How to remove everything from ListView using a button onClick? When i try “fullCourseList.clear();”, I can’t add any more courses and the page is refreshed only after visiting the page again Answer You should save off the adapter so you can call clear() on it. Clearing the list this way will…
Updating notifications after being added
I want to update the content for a reminder after it has been added before being received by the user. After setting a reminder through AlarmManager using the data stored in sqlite database, the notification from the reminder set only shows the data, title and description, that was first added, not any update…