android-listview

问题 In my application I am fetching all the images and names from a MySQL server database to the Android mobile. If the emulator screen is HVGA, only five images and names are getting displayed. In logcat also only five names are getting printed. When I scroll the screen, how many names I can see on the screen only that much names are getting printed. Instead of that, all the names have to get printed before scrolling. This my Java code: public class VegdishesListview extends BaseAdapter { String

问题 when i insert a new product into listview, the product will be display on the last position in the listview. Now i want to display the most recent added product on the first position in my listview. For example, my array product initially display like this in the listview, 0 > 1 > 2 > 3, now i want to display like this, 3 > 2 > 1 > 0. how should i do it in my code? thanks for helping. AllProductActivity.java public class AllProductActivity extends ListActivity { // Progress Dialog //private

问题 I am having a bit of a problem on my hands and I'm going to need a little. My app keeps crashing and when I look at the stacktrace this is what I get back... theproblemsolver.ListView has leaked window com.android.internal.policy.impl.PhoneWindow$DecorView{40d0e800 V.E..... R.....ID 0,0-234,72} that was originally added here 07-27 11:05:56.119: E/WindowManager(913): android.view.WindowLeaked: Activity com.theproblemsolver.ListView has leaked window com.android.internal.policy.impl.PhoneWindow

问题 I created a listview that contains two types of items either text or image.But i am getting nullpointer exception only on when i scrolling down. my adapter's code is this. public class ListViewAdapter extends BaseAdapter { ArrayList<ListModel> myList = new ArrayList<ListModel>(); LayoutInflater inflater; Context context; private static final int TYPE_ITEM1 = 1; private static final int TYPE_ITEM2 = 2; public ListViewAdapter(Context context, ArrayList<ListModel> myList) { this.myList = myList;

问题 This activity is receive value from db.select andthen i put some value to show in the listview model .And i don't know ,how to repair it.If you want more information please tell This is my runtimeError edit when intialize 08-21 21:23:36.047: E/AndroidRuntime(408): FATAL EXCEPTION: main 08-21 21:23:36.047: E/AndroidRuntime(408): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.sqlite/com.example.sqlite.FriendsListActivity}: java.lang.NullPointerException 08-21 21

问题 i am confused, i want to add an onitemclicklistener in my adapter i have no idea how do i integrate the following code in my code. any help would be appreciated. here is the adapter listView.setOnItemClickListener(new OnItemClickListener() { public void onItemClick(AdapterView<?> arg0, View v, int position, long id) { if (position == ITEM_POSITION_HERE) { Intent myIntent = new Intent(getApplicationContext(), ActivityName.class); startActivity(myIntent); } } }); and here is my java file import

问题 list_item.xml <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_marginTop="5dp"> <TextView android:id="@+id/mytitle" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentTop="true" android:layout_marginLeft="5dip" android:layout_marginTop="5dp" android:layout_toRightOf="@+id/icon" android:background="@drawable/textbox1" android

问题 I am wondering if there's a way I can pre-load a couple of views in Android ListView? For example, by default, when a listview items scrolls out of the screen, it will become a convert view and will be re-decorated as the next view on screen. My problem is, each listview item is loading a pretty large size image from memory, and it will stuck scrolling if it begin load right before it is gonna show up. I was wondering if there's a way I can specify the threshold of loading views, for example,

问题 I have a listview with custom SimpleAdapter associated. I made the custom SimpleAdapter because I want to associate a different event handler with the contained textview and the imageview than the rest of the list-item widgets. So, basically I have two different event handlers for two parts of a list-item. My SimpleAdapter customization is: class ClickableButtonListAdapter extends SimpleAdapter { private static class ViewHolder { TextView text; ImageView image; } public

问题 I would need help to get filtering to work. ListView is displayed correctly, but when I enter a letter in the search field it gives an error java.lang.NullPointerException and application closes. Here is the code snippet from my activity that I think I have to fix, but don't know how: protected void onPostExecute(String file_url) { // dismiss the dialog after getting all albums pDialog.dismiss(); // updating UI from Background Thread runOnUiThread(new Runnable() { public void run() { /** *