I have a rank of players in a viewgroup displayed programmatically.
A player has a class and a method to show it inside the viewgroup:
public void show(Activity a, ViewGroup container)
{
LayoutInflater inflater = (LayoutInflater) a.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
int res = position == 1 ? R.layout.ins_rank_first : R.layout.ins_rank;
View view = inflater.inflate(res, container, false);
CircleImageView imgUser = view.findViewById(R.id.img_rank_user);
TextView txtUser = view.findViewById(R.id.txt_rank_user);
TextView txtPosition = view.findViewById(R.id.txt_rank_position);
TextView txtScore = view.findViewById(R.id.txt_rank_score);
//load image inside imageview
a.loadImage(userImage, imgUser, R.drawable.ic_profile);
if(position == 2)
imgUser.setBorderColor(a.getResources().getColor(R.color.silver));
else if(position == 3)
imgUser.setBorderColor(a.getResources().getColor(R.color.bronze));
txtUser.setText(username);
txtPosition.setText(String.valueOf(position));
txtScore.setText(String.valueOf(score));
container.addView(view);
}
So I want to ask the server every 5 seconds to generate a new ranking to make it real-time, but I don't want to remove all ViewGroup's views because the list could be long. Therefor I would like to compare new ranking positions to older ones and then exchange views when needed. How could I achieve this?
Related
Is it possible to somehow take an array, for example, a TextView, which are in the current Activity, or is it necessary to take each view?
You can get all the views of your xml programmatically as below:
bind your ViewGroup / Parent layout
Then the child View are accessible in if condition
val container = findViewById(R.id.container) as ViewGroup
for (i in 0 until container.childCount) {
val v = container.getChildAt(i)
if (v is Button) {
// You will get Button here
}
else if(v is TextView){
// You will get textView here
}
}
I have a dynamic adapter that fills up a listview with textviews with values read from a JSON file, here is an example ( https://imgur.com/a/w9CHzxX ). Now I need to gather the user input from those fields and use it in a later part of my application, but my question is. when i generate textviews like that they all have the same ID right? so how can i specificly gather the user input of lets say the 2nd textview?
Adapter
#Override
public View getView(final int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {if (convertView == null) {
holder = new ViewHolder();
LayoutInflater inflater = (LayoutInflater)
context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.layout_question_textfield, null, true);
---> holder.editText = (AutoCompleteTextView) convertView.findViewById(R.id.edt);
---> holder.editTitel = (Button) convertView.findViewById(R.id.btn);
convertView.setTag(holder);
}
else {...}
holder.editText.setHint(HintArrayList.get(position).getEditTextValue());
ID is an attribute of a view that scope of this attribute is limited by the inflated view group that includes this view.
for example if we have this xml file (item_view.xml):
<LinearLayout
...>
<TextView
...
android:id="#+id/textView_itemVew"/>
</LinearLayout>
and then we inflate this file several times (maybe in an adapter class) as below:
View item1 = inflater.inflate(R.layout.item_view, null,true);
View item2 = inflater.inflate(R.layout.item_view, null,true);
View item3 = inflater.inflate(R.layout.item_view, null,true);
now we can access the TextView view by it's ID but we should use the view group of this TextView to find it.
//Id's are the same but view groups no!
TextView editText_of_item1 = item1.findViewById(R.id.editText_itemVew);.
TextView editText_of_item2 = item2.findViewById(R.id.editText_itemVew);
TextView editText_of_item3 = item3.findViewById(R.id.editText_itemVew);
.
.
.
in your case you can add each EditText to a list to access it after whole list inflated ... like this:
List<EditText> editTextList = new ArrayList<>();
public View getView(int position,View view,ViewGroup parent) {
LayoutInflater inflater=context.getLayoutInflater();
View itemView = inflater.inflate(R.layout.item_view, null,true);
EditText itemEditText = (EditText) itemView.findViewById(R.id.editText);
editTextList.add(itemEditText);
return itemView;
};
there is useful example in javaTpoint website for you.
I am trying to implement a Newsfeed-type layout with multiple feed items.
The newsfeed item would have a certain layout when collapsed, and this layout would be replaced by an 'exploded' version, when the item is clicked.
I accomplished this by using a ListView of custom items. The custom item XML layout file has a ViewStub which is what I used to change the layout back and forth.
Now, though, I wanted to 'migrate' the layout over to RecyclerView, and to also follow a ViewHolder design pattern.
The latter is what I have tried first, and I'm running into all sorts of problems.
My approach has been as follows:
Get reference to collapsed layout (events_list_item_content) and expanded layout (events_list_item_selected_content);
Get reference to a simple layout resource file to be set as the ViewStub layout (view_stub_layout).
Get ViewStub reference, set its layout (view_stub_layout) inflate, and add the collapsed layout view to this layout (when first creating the feed, all of its items are going to be collapsed).
(After initialisation, when an item is clicked) Remove previous view (layout) from the ViewStubLayout, add the other type of layout.
Here is my custom adapter class:
public class FeedRecyclerAdapter extends BaseAdapter {
public class ViewHolder {
View inflatedViewStub1;
ViewStub viewStub;
LinearLayout viewStubLayout;
LinearLayout listItemContent, listItemContentSelected;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final FeedItem item = feedItems.get(position);
final ViewHolder viewHolder;
if (convertView == null) {
viewHolder = new ViewHolder();
convertView = inflater.inflate(R.layout.events_list_item_content_new_container, parent, false);
View view = null;
view = inflater.inflate(R.layout.events_list_item_content, null);
viewHolder.listItemContent = (LinearLayout) view.findViewById(R.id.events_list_item_content);
view = inflater.inflate(R.layout.events_list_item_selected_content, null);
viewHolder.listItemContentSelected = (LinearLayout) view.findViewById(R.id.events_list_item_content_selected);
view = inflater.inflate(R.layout.view_stub_layout, null);
viewHolder.viewStubLayout = (LinearLayout) view.findViewById(R.id.view_stub_layout);
viewHolder.viewStub = (ViewStub) convertView.findViewById(R.id.list_item_feed);
(viewHolder.viewStubLayout).addView(viewHolder.listItemContent);
viewHolder.viewStub.setLayoutResource(R.layout.view_stub_layout);
viewHolder.inflatedViewStub1 = viewHolder.viewStub.inflate();
convertView.setTag(viewHolder);
} else viewHolder = (ViewHolder) convertView.getTag();
if (item.getExploded()) {
viewHolder.viewStubLayout.removeAllViews();
viewHolder.viewStubLayout.addView(viewHolder.listItemContentSelected);
} else {
viewHolder.viewStubLayout.removeAllViews();
viewHolder.viewStubLayout.addView(viewHolder.listItemContent);
}
return convertView;
}
However, when testing, the page where the Newsfeed is supposed to appear is blank.
ViewStub stub = (ViewStub) findViewById(R.id.layout_stub);
LinearLayout ll = (LinearLayout) findViewById(R.id.ll);
stub.setLayoutResource(layoutId);
stub.inflate(); // inflate 1st layout
ll.removeAllViews(); // remove previous view, add 2nd layout
ll.addView(LayoutInflater.from(context).inflate(secondLayoutId, ll, false));
Android ViewStub change layouts programatically
I got the following App with Costume adapter showing 2 images and 1 textview for each listview.
I can push/click/press each ListView just fine but i want to being able to recognize the X press aswell and i seem to not being able to get the view name or resource name.
My mainclass with the setOnItemclickListener looks like this
serverListView.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener(){
#Override
public void onItemClick(AdapterView<?> arg0, View view, int position, long arg3) {
//recieve and check if X image is pressed
}
});
This is the getView method in my Adapter. I tried to recognize the different image clicks in here without any different results.
#Override
public View getView(final int position,final View convertView,final ViewGroup parent) {
View row = convertView;
ServerHolder holder = null;
if(row == null){
LayoutInflater inflater = ((Activity)context).getLayoutInflater();
row = inflater.inflate(layoutResourceId, parent, false);
holder = new ServerHolder();
holder.imgIcon = (ImageView)row.findViewById(R.id.thumbImage);
holder.txtTitle = (TextView)row.findViewById(R.id.name);
holder.removeIcon = (ImageView)row.findViewById(R.id.removeServer);
row.setTag(holder);
}
else{
holder = (ServerHolder)row.getTag();
}
RowServer rs = servers.get(position);
holder.imgIcon.setImageResource(rs.getIcon());
holder.txtTitle.setText(rs.getName());
return row;
}
You probably have to add listeners to the subitems in getView(...). Try setOnClickListener(...) for the views you want to have events attached.
I have a listview that uses a customadapter based on the baseadapter. The listview populates ok using external data and I can pick up the click events and know which item has been selected.
I'm having a problem updating the clicked item's views, like TextView and ViewFlipper.
Do I have to update something via the listview or is it via the adapter. I've tried things like the following;
View test = (View)adapter.getView(pos, null, myListView);
ViewFlipper temp = (ViewFlipper)test.findViewById(R.id.flipholder);
temp.showNext();
TextView temp2 = (TextView)test.findViewById(R.id.filmtitle);
temp2.setText("Hello World");
Which results in the viewfliper flipping the first and third item or second and fourth and the text not updating at all.
Any ideas?
Cheers
Try this pattern in getView:
public View getView(int position, View convertView, ViewGroup parent) {
// A ViewHolder keeps references to children views to avoid unneccessary calls
// to findViewById() on each row.
ViewHolder holder;
// When convertView is not null, we can reuse it directly, there is no need
// to reinflate it. We only inflate a new View when the convertView supplied
// by ListView is null.
if (convertView == null) {
convertView = mInflater.inflate(R.layout.list_item_icon_text, null);
// Creates a ViewHolder and store references to the two children views
// we want to bind data to.
holder = new ViewHolder();
holder.text = (TextView) convertView.findViewById(R.id.text);
holder.icon = (ImageView) convertView.findViewById(R.id.icon);
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Bind the data efficiently with the holder.
holder.text.setText(DATA[position]);
holder.icon.setImageBitmap((position & 1) == 1 ? mIcon1 : mIcon2);
return convertView;
}
static class ViewHolder {
TextView text;
ImageView icon;
}
}