android-viewholder

Android listview using ViewHolder

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Change your code at below. I think you’re missing that. public class AlphabeticalAdapter extends ArrayAdapter<String> { int layoutResourceId; private final Context context; private List<String> data; private List<String> tags; private ProgressDialog mProgressDialog; private ImageView downloadImageButton; public AlphabeticalAdapter(Context context, int resource, List<String> data) { super(context, resource, data); this.layoutResourceId = resource; this.context = context; this.data = data; tags … Read more

What’s better? notifyDataSetChanged or notifyItemChanged in loop?

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If you are simply updating one part of the view, use the notifyItemRangeChanged()or notifyItemChanged() instead of notifiyDataSetChanged(). The difference here has to do with structural changes vs item changes. This is on the android developers RecyclerView.Adapter documentation found here. Here is another tidbit on the differences between the two types of changes: There are two … Read more

What is the benefit of ViewHolder pattern in android?

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Understand how listview recycling works How ListView’s recycling mechanism works You cannot recycle a row that is presently in use. The above link explains how listview recycling mechanism works So What is the benefit of using ViewHolder? Quoting docs Your code might call findViewById() frequently during the scrolling of ListView, which can slow down performance. … Read more

What is the main purpose of setTag() getTag() methods of View?

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Let’s say you generate a bunch of views that are similar. You could set an OnClickListener for each view individually: button1.setOnClickListener(new OnClickListener … ); button2.setOnClickListener(new OnClickListener … ); … Then you have to create a unique onClick method for each view even if they do the similar things, like: public void onClick(View v) { doAction(1); … Read more

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