android-lazyadapter | 易学教程

listview lazyadapter

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问题 I like to pass selected item value from ListView to another activity. I am using this code to get the details associated with the hashmap but I get java.lang.Integer cannot be cast to java.util.HashMap . public void onItemClick(AdapterView<?> parent, View view, int position, long id) { HashMap<String, String> o = (HashMap<String, String>) list.getItemAtPosition(position); Toast.makeText(CustomizedListView.this, "ID '" + o.get("KEY_TITLE") + "' was clicked.", Toast.LENGTH_SHORT).show(); } How

listview lazyadapter

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Listview : Getting the text of the selected row

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问题 I have a listview with an image and a textview in each row. I want to get the value of the text on the clicking of the whole row. Below code is behaving strange.I am getting the value of random row instead of the one clicked. I am not getting what is wrong. Any help would be appreciated. I am doing this, : public static class LazyAdapter extends BaseAdapter { private Activity activity; private ArrayList<HashMap<String, String>> data; private static LayoutInflater inflater=null; public

Listview : Getting the text of the selected row

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how to clear the cached images in Android?

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问题 How to clear the cached image from memory programatically in Android? I have a ListView with icons when I scroll its reloads the image. So its produce the OutofMemoryError . I want clear the cache while gets this exception. how to do that? any help? EDIT: i am just using this code on my program to loadimage: http://ballardhack.wordpress.com/2010/04/10/loading-images-over-http-on-a-separate-thread-on-android/ 回答1: Are you re-using the bitmap objects in the ListView? Romain Guy talked about how

TextView on LazyAdapter display wrong data

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问题 i already success build up an app using ListView with LazyAdapter based on this link but there's anomali on my listview. each listview have 1 imageview and 2 textview. so the lazy adapter will display "thumbnail" to imageview and "name" to Textview1 and "address" to Textview2... the ImageView is coorect...it can display the image thumbnail from database... but the problem here is, the BOTH TEXTVIEW didnt display the correct data! instead displaying the "name" and the "address" from database..

How to fix notifyDataSetChanged/ListView problems in dynamic Adapter wrapper Android

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问题 Summary: Trying to dynamically add heading rows to a ListView via a custom adapter wrapper. ListView is having trouble keeping the scroll position in sync. Runnable demo project provided. I would like to dynamically add items to a list based on the values in a CursorAdapter, several positions ahead of what the user is currently viewing. To do this, I have an adapter that wraps the CursorAdapter and keeps the new content indexed in a SparseArray. The ListView needs to be updated when items are

how to clear the cached images in Android?

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How to clear the cached image from memory programatically in Android? I have a ListView with icons when I scroll its reloads the image. So its produce the OutofMemoryError . I want clear the cache while gets this exception. how to do that? any help? EDIT: i am just using this code on my program to loadimage: http://ballardhack.wordpress.com/2010/04/10/loading-images-over-http-on-a-separate-thread-on-android/ Are you re-using the bitmap objects in the ListView? Romain Guy talked about how important this is for memory and smooth performance in his Android talk on layouts and views at Google I/O

How to fix notifyDataSetChanged/ListView problems in dynamic Adapter wrapper Android

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Summary: Trying to dynamically add heading rows to a ListView via a custom adapter wrapper. ListView is having trouble keeping the scroll position in sync. Runnable demo project provided. I would like to dynamically add items to a list based on the values in a CursorAdapter, several positions ahead of what the user is currently viewing. To do this, I have an adapter that wraps the CursorAdapter and keeps the new content indexed in a SparseArray. The ListView needs to be updated when items are added to the custom adapter, but I have met a lot of pitfalls trying to get that to work and would

Lazy Load images on Listview in android(Beginner Level)? [duplicate]

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Possible Duplicate: Android - How do I do a lazy load of images in ListView I am working on the listview with the custom adapter. I want to load the images and text view on it. The images are load from the internet urls. I just want to show the images which are visible list item to hte user. I refered the Shelves opensource project example from romainguy , but its to complicated to understand the code. For a beginner level, I just want to know how to handle the tag between the adapter and activity. From the commonsware example I can set the tag on adapter, but can't show the corresponding