android-adapter

问题 The Problem with this code is that the data is not showing in listview and the app is also not showing any error. I am initializing this model class from some other activity, so please any one can give me suggestion about what would be the real problem. public class FireBaseListAdapter extends AppCompatActivity { private ListView mlistview; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_fire_base_list_adapter

问题 I am getting an error saying no adapter attach skipping layout.and the list doesn't appear in when emulator runs.please help.I cant see anything in list.screen appears blank.other items in the activity are appearing.i have seen almost all answer on the internet but didn't get any solution this is the logcat error. E/RecyclerView: No adapter attached; skipping layout public class SongsTab extends Fragment { private ArrayList<songInfo> _songs = new ArrayList<>(); ; RecyclerView recyclerView;

问题 I have a recyclerView that it get me crash : Here is my StartActivity : public class StartActivity extends AppCompatActivity { TextView txtTest; private ProgressDialog pDialog; // These tags will be used to cancel the requests private String tag_json_obj = "jobj_req", tag_json_arry = "jarray_req"; private RecyclerView.Adapter mAdapter; RecyclerView UserCode_Recycler; private LinearLayoutManager mLayoutManager; List<Marketing_Code> userCodeList; @Override protected void onCreate(Bundle

问题 How to get the position for clicked button inside the RecyclerView items Here's my onBindViewHolder : public void onBindViewHolder(MyViewHolder holder, int position) { Masar masar=masrList.get(position); holder.masarName.setText(masar.getMasarTitle()); holder.masarDesc.setText(masar.getMasarDescreption()); //How to get the Position holder.masarImg.setImageResource(masar.getMasarImg()); holder.mapBtn.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v ) { //if

问题 For some reason I am getting a null pointer exception pointing to videosFound when it is indeed not null. Even the parameter, adapter , that is being passed in is not null. I check and verify this simply by printing out if its null or not (both of them are NOT null). So can someone please tell me how I am getting this error? private ListView videosFound; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_search);

问题 I need a layout like this: The Red titles are the first level array from dish_options and the RadioButtons are a populated from an array items inside dish_options of the json: As you may notice the dish_options is an array, which might have many more object inside one of the keys of this dish_options might store an items arrays. I tried using getItemViewType() and set different layouts for first level dish_options (red title) and implemented a different layout for the RadioButton in each row

问题 in this code after insterting new items to adapert my list could not refresh and update with notifyDataSetChanged() for example for this line my adapter could set without any problem. adapter = new ReceivedAdapter(context, items); getRequestFromServer(0, 10); after that i have 10 item in list and adapter . private String getRequestFromServer(long lastID, int count) { String received = ""; try { received = new JsonService(config_username, config_password, lastID, count, G.F_RECEIVE_SMS)

问题 I want to implement a to-do list application. I have three activities: one main activity, one adding activity and one editing activity. In my main activity there is a add button and a listview that shows the to-do items. When I click add button, adding activity is executed. In this activity,there is an edittext for the task, a datepicker and a spinner for priority level. When ok button is clicked, all these entred values are sent to main activity's listview as a line. And, when click an item

问题 I saw getView implementations that used convertView parameter directly: if(convertView!=null) ... return convertView Another implementations call super.getView: View view = super.getView( position, convertView, parent ); if(view!=null) ... return view My question is, What is the right method? 回答1: I guess you are talking about Adapter.getView(). Which adapter are you extending? Most adapters have no implementation of getView() themselves and expect that you check if convertView is null before

问题 I am having a problem where when I call the adapter.notifyDataSetChange() to refresh the listActifity from the onResume() function, it doesn't seem to be working from any other functions from that activity afterwards. I want the list(view) to refresh when the user clicks the back button(while on another screen) and returns to the window with the list. One of the things I noticed is that the notifyDataSetChange() works(from other functions) when I change one of the objects from the array list