android-listview

问题 I'm having problems with button presses in ListView rows. The background attribute for each Button refers to a XML selector file; in order to select a different image on button presses. I'm able to get press events from OnClickListener, but the state selector breaks and does not register presses with android:state_pressed="true" and android:state_focused="false" . If I remove android:descendantFocusability="blocksDescendants" from the parent/root Layout XML for the button; then the press

问题 In my list view, I want to make it so that it will change the drawable in the image view i made, but I get an error every time I run it. ImageView Player; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); Player = (ImageView)findViewById(R.id.bob); setListAdapter(new ArrayAdapter<String>(this, R.layout.pointguards, PointGuards)); final ListView lv = getListView(); lv.setTextFilterEnabled(true); lv.setOnItemClickListener(new OnItemClickListener() {

问题 I have a multiline listview , implemented using hashmaps . I get my data from a database . I have another activity in which i am adding my items , which is being added to the database . Now when pressing the save button , the new added item should appear immediately in the listview which is implemented in a fragment . I can't figure out how to refresh the listview in this activity . here's my fragment implementing the listview : public View onCreateView(LayoutInflater inflater, ViewGroup

问题 I want to know that what will be the best way to implement spinner in a listview. My scenario is I am getting products names, prices and their number from server side. For this I am going to make one main Activity (with one xml) that will contain the listview and a separate adapter class to make the adapter for the listview and that adapter layout. Now I want to ask is this approach will be good as I will be having some operations on spinner selection (getting each spinner (or product)

问题 I have button and progress bar(invisible) in listview. When button clicks it should disappear and progress bar should be visible and start running ( downloading from web server ) and when it is done with running button should appear again. Now when I click first item's button, the progress bar runs but if I scroll down until first item goes off screen I see progress bar running simultaneously with first item's progress bar on last item of listview. If I scroll up the first item's progressbar

问题 I am using Jake Wharton's LRU disk cache to store and retrive bitmaps that are displayed in a ListView. This works fine so long as I store and access bitmaps from within the same activity. However, if I try to access the cach from other activities within the app (i.e. so I don't have to downlaod the same image twice) I get a NullPointerException. Am I missing something here? This isn't a memory cache where the files could/would be removed. Shouldn't the disk cache be accessable from all the

问题 I have multiple lists in my Android app, the activities that contain those (recycle) listviews also contain other content. Putting a listview below the content works fine without any custom modelling. However, when scrolling in the list, it is only scrolling the list, thus showing about 1 or 2 items, while we would like to scroll the whole activity, so that the content moves up and the complete list is shown. To make an activity scrollable, we would need a ScrollView, this goes a bit against

问题 I have create a LinearLayout for a list item with the following XML code <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="wrap_content" android:padding="10dip"> <TextView android:id="@+id/txtTitle" android:layout_width="fill_parent" android:layout_height="wrap_content" android:textStyle="normal|bold" android:textSize="16dip" android:padding="5dip" android:text="Title" android

问题 I am not able to change Image on listview item when click on listview button Logcat error java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.ImageView.setBackgroundResource(int)' on a null object reference Java code onclick holder.txtnext.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { // TODO Auto-generated method stub try{ imageUrls=strimgview.get(pos).split("\\|\\|"); i=imageUrls.length; if((i<=1)) { i++; ImageView

问题 I have an activity with portrait and landscape mode. the activity contains listview. this listview has a footer, which I added programmatically like this: View footer = LayoutInflater.from(this).inflate(R.layout.footer_button, null); footer.setPadding(0, 0, 0, 0); lv_details.addFooterView(footer); and the layout for the footer footer_button.xml is: <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="wrap_content"