listview-adapter | 易学教程

RecyclerView with GridView

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问题 Once I write a ListView demo, the ListView 's items have some different types. item1: Text Pic Pic Pic Pic Pic Pic item2: Text Pic Pic Pic Pic item3: Text Pic Pic Pic Pic Pic Pic Pic Pic Pic ... So I override the getViewTypeCount() and getItemViewType() .It work well. But Now I change to use RecyclerView . Is there a better solution?Please help me. 回答1: use getItemCount() { //pojo class array size return mDataset.size(); } 回答2: This is sample, you can create an item view with a textview and

Attempt to invoke virtual method On changing Listview item image

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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

How to Load Video Thumbnail From Video Url in ListView adapter

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问题 I have a ListView and I want to populate it with video form a URL. I can show Pictures in ListView adapter easily from URL, but how to load a video thumbnail? 回答1: You can use MediaMetadataRetriever to get your video thumbnail. new AsyncTask<Void, Void, Bitmap>() { @Override protected Bitmap doInBackground(Void... params) { Bitmap bitmap = null; String videoPath = "http://techslides.com/demos/sample-videos/small.mp4"; MediaMetadataRetriever mediaMetadataRetriever = null; try {

when I press a button which exists inside the custom list view it deletes another row from the one that I want

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问题 I have created a custom list view adapter, which is like a table with rows and columns. I have not fully understand yet, how getView method works. the last colum of each row, I have placed a reject button. When I press this button, it deletes the specific row. The problem is that it does not delete the row when I press, instead it deletes another row. I quote the code of the custom adapter public class ListViewAdapter extends BaseAdapter { public final String TAG = getClass().getSimpleName();

Android change ListView font

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Seems to be a simple question, but since I am new to Android development I have very little idea about Android ListViews. Following is the code I have used for a ListView in my project. /*Listview code starts*/ mainListView = (ListView) findViewById( R.id.mainListView ); ArrayList<String> planetList = new ArrayList<String>(); planetList.addAll( Arrays.asList(values) ); listAdapter = new ArrayAdapter<String>(this, R.layout.list1, values); mainListView.setAdapter(listAdapter); mainListView.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent,

bad convertView type BaseAdapter of ListView

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问题 I have a list view adapter that uses different types of view rows. Most of the time it works fine. But when I remove an element from the list it crashes. It sends a convertView of the incorrect type to getView public View getView(int position, View convertView, ViewGroup patent) ... But getItemViewType is returning the correct type. public int getItemViewType(int position) so I see something that looks like this give me the type for position 1 -> returns correct type (say 1) give me a view

How to create a carousel using viewpager and fragmentStatePager Adapter

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问题 I am new to android and i am trying to create a carousel in android. My class structure are as follows public class PageViewActivity extends FragmentActivity { ViewPager pager; ... public void onCreate(Bundle savedInstanceState) { final ViewPager pager = (ViewPager) findViewById(R.id.pager); MyPageAdapter pageAdapter = new MyPageAdapter(getSupportFragmentManager(),getBaseContext()); pager.setAdapter(pageAdapter); } ... public class MyPageAdapter extends FragmentStatePagerAdapter { @Override

How to create a carousel using viewpager and fragmentStatePager Adapter

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I am new to android and i am trying to create a carousel in android. My class structure are as follows public class PageViewActivity extends FragmentActivity { ViewPager pager; ... public void onCreate(Bundle savedInstanceState) { final ViewPager pager = (ViewPager) findViewById(R.id.pager); MyPageAdapter pageAdapter = new MyPageAdapter(getSupportFragmentManager(),getBaseContext()); pager.setAdapter(pageAdapter); } ... public class MyPageAdapter extends FragmentStatePagerAdapter { @Override public ImageFragment getItem(int position) { ... return fragment; } @Override public int getCount() {

Listview duplicates item every 6 times

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问题 Hope everyone's good; I know this issue was reviewed earlier couple of times but after a long search I still didn't find a solution. My custom listview duplicates items every 6 item. Already checked and tried: 1- layout_width and layout_height doesn't contain wrap_content 2- holder = new ListViewItem() is before any initialization of contents 3- There is a "convertView != null" 4- holder.linearLayout.getChild() can't be use in my case because the layout isn't Linear 5- clear() If anyone can

Listview duplicates item every 6 times

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Hope everyone's good; I know this issue was reviewed earlier couple of times but after a long search I still didn't find a solution. My custom listview duplicates items every 6 item. Already checked and tried: 1- layout_width and layout_height doesn't contain wrap_content 2- holder = new ListViewItem() is before any initialization of contents 3- There is a "convertView != null" 4- holder.linearLayout.getChild() can't be use in my case because the layout isn't Linear 5- clear() If anyone can help me this is my codes getView() of CustomListViewAdapter.java public View getView(final int position,