android-arrayadapter

问题 The ArrayList appears to be populating just fine, but no matter what approach I use, I can't seem to get the adapter to populate with data. I have tried adding to the ArrayList , also to the ArrayAdapter . Either way I am unable to get a response at the AutoCompleteTextView level, or in the ArrayAdapter itself(and of course the AutoCompleteTextView is doing nothing). Can anybody see what's wrong? public class MainActivity extends Activity implements TextWatcher { // private AutoCompleteView

问题 Why is my spinner jumping while scrolling? I'm simply doing following: ArrayAdapter<String> adapter = new ArrayAdapter<String>(v.getContext(), layout, textViewId, new ArrayList<String>()); adapter.setDropDownViewResource(layoutDropdown); adapter.addAll(<DATA>); spinner.setAdapter(adapter); spinner.setOnItemSelectedListener(listener); As long as the dropdown is small, everything works fine but if it gets larger and scrollable, I see that it jumps around while scrolling. Why? I'm not changing

问题 I am very new to android development. I am trying to a build an application with tags (which are added through fragments). In one of the fragments, I am trying to display a list. This list has been populated using ListAdapter which I have extended from ArrayAdapter and I have overloaded getView() method. This is my fragment public class tabcontentActivity extends Fragment { public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (container ==

问题 As in, can the ELEMENTS of a ListView be Fragments. I know that you can assign a TextView XML to a ListView to change the way it looks, but can you add Fragments into a ListView. For instance: I have a Fragment. The XML for said Fragment contains an ImageView, a couple of large-style TextViews, and a small-style TextView. The Fragment class code receives a Bundle, then based on the contents populates the TextViews and ImageView accordingly. Both the Fragment XML and the Fragment code work

问题 I have a autocomplete text view in my android project which is working fine but it only works if first value is entered in it. So for making it more customizable, I have added the below class public class CustomArrayAdapterWIthFilter extends ArrayAdapter<String> implements Filterable { List<String> items = null; List<String> originalItems = null; private MyFilters myFilters = null; Context mContext; public CustomArrayAdapterWIthFilter(@NonNull Context context, @LayoutRes int resource,

问题 I need to override a getFilter() method from the class ArrayAdapter and i found the source code from here in the github //package name import java.util.ArrayList; import java.util.Arrays; import java.util.List; import android.content.Context; import android.util.Log; import android.widget.ArrayAdapter; import android.widget.Filter; import android.widget.Filterable; public class CustomAdapter<T> extends ArrayAdapter<T> implements Filterable{ private ArrayList<T> mOriginalValues; private List<T

问题 What is the difference between setContentView(R.layout.main); and ArrayAdapter arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, sarray); What is the difference between R.layout and android.R.layout ? 回答1: R.layout.* are layouts you provide (in res/layout, for example). android.R.layout.* are layouts that ship with the Android SDK. 回答2: R.layout denotes the resources which are provided by your application. All the variables, resource files (drawable, string,

问题 What is the difference between setContentView(R.layout.main); and ArrayAdapter arrayAdapter = new ArrayAdapter(this, android.R.layout.simple_spinner_dropdown_item, sarray); What is the difference between R.layout and android.R.layout ? 回答1: R.layout.* are layouts you provide (in res/layout, for example). android.R.layout.* are layouts that ship with the Android SDK. 回答2: R.layout denotes the resources which are provided by your application. All the variables, resource files (drawable, string,

问题 I am trying to create a nice layout for my list items, but my code only works when it is simplified like this: <?xml version="1.0" encoding="utf-8"?> <TextView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:padding="10dp" android:textSize="16sp" > </TextView> When I add a little bit more it compiles and runs but it force closes on start and gives me the error ArrayAdapter requires ID to be a TextView :

问题 I am getting the following error while trying to delete specific entry from listview and hashmap: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.get(ArrayList.java:411) at android.widget.ArrayAdapter.getItem(ArrayAdapter.java:349) at android.widget.AdapterView.getItemAtPosition(AdapterView.java:790) at com.example.cmmalli.helloworld.MainActivity.onContextItemSelected(MainActivity.java:120) at android.app.Activity.onMenuItemSelected(Activity.java:3224) at android