android-listview

问题 I am using displayImage() method of UniversalImageLoader library in the adapter class, which sets images(from url) in the list items. i want if i reset adapter in my listview, images should not reload if the urls are same as previous urls. 回答1: There is two solution already posted in the issue section of Universal Image Loader . Solution #1: You can use custom displayer: new FadeInBitmapDisplayer(300) { @Override public Bitmap display(Bitmap bitmap, ImageView imageView, LoadedFrom loadedFrom)

问题 I have a list view that I populate from a JSON array. First the values are extracted from the JSON array, then put into a HashMap. Then this HashMap is added to an ArrayList. From here, the necessary data is added to a ListAdapter. I searched online for days now, to find a way to add a search function to this, but none of them uses this combination of ListAdapater, ArrayList and HashMap. I am a beginner so can someone help me do this please? This is my code public class ListNew extends

问题 I have a listview with a custom Adapter. A custom row in the listView containts 2 imagebuttons that need to handle a something when I click on it. But it doesn't work well like I want, because when I start the app and click on the imagebutton then nothing happens, but if I first click on the row and then on the imageButton, then my click is being handled. I tried a few solutions that helped other users here SO, but nobody had the exact same problem as me that it gets handled after a row click

问题 I want to create swipe listview, when user swipe right to left on an listview item, user will be show some button options. It look like below image : I have been seen some swipe listview library, but it isn't what I need. Can anyone help me suggest to me the library that can do build my listview? Thanks. 回答1: I used to have the same problem as your, I couldn't find a library to swipe to show other buttons so I ended up writing a new library for myself. Check out my library: SwipeRevealLayout

问题 I have a gradient that covers the whole background of my layout. However when I close the software keyboard it takes about 1 second for the gradient to resize to full height. This produces the white background you see in the picture below. I thought of doing something like android:windowSoftInputMode="adjustPan" however this would be bad practice because a big part of the list view would be hidden under the keyboard. The gradient: <?xml version="1.0" encoding="utf-8"?> <shape xmlns:android=

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago . I just want to create a wall in my app just like in Instagram and Facebook.And i have no such idea to do this. I am in a search for basic idea how to create a simple wall in my Android app.Can any one plz provide a tutorial or any concept of doing this(wall)... 回答1: You want to

问题 I have a ListView and in every single ListviewItem there is an ImageView with a little star (for marking it as favourite). Therefore I put an OnClickListener to the ImageView on every item in the custom ArrayAdapter. imgStar.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { Bitmap bitmap = ((BitmapDrawable)imgStar.getDrawable()).getBitmap(); Bitmap bitmap2 = ((BitmapDrawable)(context.getResources().getDrawable(R.drawable.ic_action_not_important))).getBitmap();

问题 (I have already seen this similar question) I have a ListView for which I've written a custom adapter, and an onitemclicklistener . I'm having an issue where, when any element of the list is selected, getView is called (twice) for each of the top 4 elements of the ListView , even if those elements are not visible. This happens even if I don't call notifyDataSetChanged on the adapter - those first 4 views are fetched twice regardless. Is this normal behavior? My issue is not as much that it's

问题 I am practicing ListView and I have placed a few List Items on an activity. Right now I have 3 items of list (in three rows). I want that once a user click one of the row (let's say it's my first row for now) s/he should be able to see some details text about it. That text will be displayed somewhere at at the bottom of the activity , outside the ListView.How could I do that? Like this: I am working on this code: MainActivity.java: public class MainActivity extends ActionBarActivity {

问题 I have a ListView which onItemClick selected item changes its layout, pops different buttons. If any other item is selected, the previous selected one returns to normal. My ListView adapter works fine but refreshing the whole list with notifyDataSetChanged() in my adapter takes too much time. My problem is to refresh only the changed items in the ListView . And also I would like to have suggestions for better scrolling performance. 回答1: try to implement View Holder Pattern it increases the