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How to clear a recyclerview on app start


How to clear a recyclerview on app start

By : Abdulmuez Sagga
Date : November 21 2020, 11:01 PM
hop of those help? I'm new at android programming and I'm facing a bit of a problem. Watching some tutorials I started developing an app to open Camera, take photo and create an image gallery. All that I managed to build, except that I want it to renew (clear all items) of the image gallery on app opening (or any button click). , I guess you can simply add another button signed to this method:
code :
public void deleteContent(){
    File directory = Environment.getExternalStoragePublicDirectory(Environment.DIRECTORY_PICTURES) + "directory_name");
    if (directory.isDirectory())
    {
        String[] images = directory.list();
        for (int i = 0; i < images.length; i++)
        {
            new File(directory, images[i]).delete();
        }
    }
}


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When to clear listeners from innner RecyclerView when it is being used inside another RecyclerView(outer)

When to clear listeners from innner RecyclerView when it is being used inside another RecyclerView(outer)


By : Dharmesh Dhameliya
Date : March 29 2020, 07:55 AM
will help you I created a custom RecyclerView (inner) and override it's onScrollStateChanged method and have implemented scroll-changed the logic there.
I also had to set some custom dataset to the listener, which I am setting while setting the adapter for the RecyclerView.
RecyclerView with in recyclerView with start ActivityOnresult

RecyclerView with in recyclerView with start ActivityOnresult


By : Shashidhar Gouda
Date : March 29 2020, 07:55 AM
this one helps. I have a recycler view(A) containing another recyclerview(B). When I click on the plus icon in recyclerview(A) item, it opens up a new activity with a recyclerview(C). Long pressing and selecting few items and clicking on done. This needs to update a recyclerview(B) on recyclerview (A) item on which I clicked the plus icon. , First change your code by this below :
code :
   holder.eventUpcomingAddPeople.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Activity origin = (Activity) context;
            Intent i = new Intent(getAppContext(), ContactsActivity.class);
            i.putExtra("selectedPosition", position);
            origin.startActivityForResult(i, CONTACT_CODE);
        }
    });

@Override
public void onReceived(int requestCode, int resultCode, Intent data) {

if (requestCode == CONTACT_CODE && resultCode == RESULT_OK && data != null) {
    int result = data.getIntExtra("selectedPosition","put a default value in case of null");
    List<Contact> contactsLists = (ArrayList<Contact>) data.getSerializableExtra("contacts");
    contactsList.clear();
    contactsList.addAll(contactsLists);

    contactAdapter.setContactList(contactsLists);
     upcomingEventsAdapter.notifyItemChanged(result);
}
}
int param = getIntent().getIntExtra("selectedPosition");
Intent resultIntent = new Intent();
resultIntent.putExtra("contacts", Your selected contacts);
resultIntent.putExtra("selectedPosition", param);

setResult(RESULT_OK, resultIntent);
finish();
Android Studio start a wrong activity, but when clear data and cache of the app the app start as normal

Android Studio start a wrong activity, but when clear data and cache of the app the app start as normal


By : Sebastián Flores
Date : March 29 2020, 07:55 AM
help you fix your problem After intensive code analyzing, I've finally found what causes the problem. This line of code had been the problem that cause my page to start of a wrong activity.
code :
if (settings.getBoolean("connected", true)) {
    /* The user has already login, so start the dashboard */
        Intent intent = new Intent(SplashScreen.this, MainActivity.class);
        startActivity(intent);
        finish();
    }
if (settings.contain("connected")) {
    /* The user has already login, so start the dashboard */
        Intent intent = new Intent(SplashScreen.this, MainActivity.class);
        startActivity(intent);
        finish();
    }
RecyclerView: How to clear the recycled views from RecyclerView.RecycledViewPool

RecyclerView: How to clear the recycled views from RecyclerView.RecycledViewPool


By : Lu Trina
Date : March 29 2020, 07:55 AM
With these it helps To prevent RecyclerView caching the detached but not recycled views use:
Firebase+RecyclerView: RecyclerView not displaying on application start

Firebase+RecyclerView: RecyclerView not displaying on application start


By : Sven Norquist
Date : March 29 2020, 07:55 AM
help you fix your problem In my case this was caused by mRecyclerView.setHasFixedSize(true); If you comment out this line of code the list loads properly. I got my solution from this discussion: https://github.com/firebase/FirebaseUI-Android/issues/204
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