I'm getting a variable data sent from activity to my adapter by using
sendData method, but every time when I try to access it in my getView method it resets to 0, please help. I've tried to debug code to check if the data from an activity is passing and it looks ok. I also created a getNumb method but still, the variable resets to 0. Here is my adapter code:
public class WorkoutListAdapterTwo extends BaseAdapter {
private int y;
public WorkoutListAdapterTwo() {
}
public int sendData(int x){
this.y = x;
return y;
}
public int getNumb(){
return this.y;
}
private static LayoutInflater mLayoutInflater = null;
public WorkoutListAdapterTwo(Activity ctx) {
this.mLayoutInflater = ctx.getLayoutInflater();
}
#Override
public int getCount() {
return WorkoutContentTwo.WORKOUTSTWO.size();
}
#Override
public Object getItem(int position) {
return WorkoutContentTwo.WORKOUTSTWO.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder;
int j = getNumb();
WorkoutTwo workout = (WorkoutTwo) getItem(j);
String [] arrOfStrings = workout.name.split(",");
if (convertView == null) {
convertView = mLayoutInflater.inflate(R.layout.adapter_workout_row, parent, false);
holder = new ViewHolder();
holder.id = (TextView) convertView.findViewById(R.id.workout_id);
holder.name = (TextView) convertView.findViewById(R.id.workout_name);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// Set the content for the ListView row
//holder.id.setText(workout.id);
//holder.name.setText(arrOfStrings[i]);
holder.id.setText(Integer.toString(position+1));
holder.name.setText(workout.ArrList[position]);
// Set the color for the ListView row
holder.id.setBackgroundColor(workout.dark);
holder.name.setBackgroundColor(workout.light);
return convertView;
}
Here I'm adding the code where I'm calling my method:
public void onItemSelected(int position) {
// Start the detail activity for the selected workout ID.
Intent detailIntent = new Intent(this, WorkoutDetailActivityTwo.class);
detailIntent.putExtra(WorkoutDetailFragmentTwo.ARG_WORKOUT_POS, position);
WorkoutListAdapterTwo newAdd = new WorkoutListAdapterTwo();
newAdd.sendData(position);
newAdd.notifyDataSetChanged();
startActivity(detailIntent);
}
Are you notifying your adapter to update views after updating the value? If your sendData() is not called until after the adapter has done it's first draw, you will need to call notifyDataSetChanged() so that the adapter knows there are new values that should be used to update your views.
You have to make a interface or you can a use notifyDataSetChanged depends on the use if you are doing search operation then use the notifyDataSetChanged method but if you want to send some data then
Fragment or activity
public class ExampleFragment extends Fragment implements MyAdapter.SuccessResponse{
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View contentView = inflater.inflate(R.layout.my_layout, container, false);
MyAdapter myAdapter = new MyAdapter(getActivity(), 0);
myAdapter.successResponse = this;
return contentView;
}
#Override
public void onSuccess() {
}
}
The adapter code
class MyAdapter extends ArrayAdapter{
SuccessResponse successResponse;
public MyAdapter(Context context, int resource) {
super(context, resource);
}
public interface SuccessResponse{
void onSuccess();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
//ur views
linearLayout.setOnClickListener(new View.OnClickListener{
#Override
public void onClick (View view){
if(successResponse!=null)
successResponse.onSuccess();
}
})
}
}
You can use any type of adapter i am use arrayadaper here.
Related
I have a ListView and a CustomAdapter. The elements are all successfully loaded into the list. Now I want to change the background color of a certain element of the list by clicking on an external button. But I do not know how to access a specific item in the list.
Here is the CustomAdapter class:
public class CustomAdapter extends BaseAdapter {
private Context ctx;
private int resource;
private List<ItemModel> items;
public PreorderListAdapter(Context context, int resource, List<ItemModel> items){
this.ctx = context;
this.resource = resource;
this.items = items;
}
#Override
public int getCount() {
return items.size();
}
#Override
public ItemModel getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#NonNull
#Override
public View getView(int i, View convertView, #NonNull ViewGroup parent) {
View view = convertView;
if(view == null){
LayoutInflater inflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(resource, null);
}
TextView text1 = (TextView) view.findViewById(R.id.text1);
TextView text2 = (TextView) view.findViewById(R.id.text2);
TextView text3 = (TextView) view.findViewById(R.id.text3);
ItemModel item = items.get(i);
text1.setText(item.getName());
text2.setText(item.getOption2());
text3.setText(item.getOption3());
return view;
}
}
You can do it like this inside your getView() method
view.setOnClickListener(new OnClickListener()
{
#Override
public void onClick(View v)
{
view.setBackgroundColor(ContextCompat.getColor(this, R.color.yourcolor));
}
});
If you have a button on your view then performs the listener on that button
If you want to get your selected item view from your parent activity then :
yourlistview.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent,View view, int position, long id)
{
selectedposition = position ;
}
});
View view = listView.getAdapter().getView(selectedposition,null,listview);
Then change its background:
view.setBackgroundColor(ContextCompat.getColor(this, R.color.yourcolor));
please define your color in your color.xml file
If you have more than one view then , create an ArrayList<View> and do some loop
create a custom listener interface in your activity and your
adapter will implement this.
public interface OnClickListenerFromActivity {
void onActivityButtonClick(int position);
}
on click in your button call your listener's method
mOnClickListenerFromActivity.onActivityButtonClick(mList.getItem(yourPostion));
implement this listener into your adapter
public class CustomAdapter extends BaseAdapter implements Activity.OnClickListenerFromActivity {
private Context ctx;
private int resource;
private List<ItemModel> items;
public PreorderListAdapter(Context context, int resource, List<ItemModel> items){
this.ctx = context;
this.resource = resource;
this.items = items;
}
#Override
public int getCount() {
return items.size();
}
#Override
public ItemModel getItem(int position) {
return items.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#NonNull
#Override
public View getView(int i, View convertView, #NonNull ViewGroup parent) {
View view = convertView;
if(view == null){
LayoutInflater inflater = (LayoutInflater)ctx.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(resource, null);
}
TextView text1 = (TextView) view.findViewById(R.id.text1);
TextView text2 = (TextView) view.findViewById(R.id.text2);
TextView text3 = (TextView) view.findViewById(R.id.text3);
ItemModel item = items.get(i);
text1.setText(item.getName());
text2.setText(item.getOption2());
text3.setText(item.getOption3());
return view;
}
public void onActivityButtonClick(int position) {
// get your item through position and
// set your color here
}
}
I'm new at android. and I want to load a new template which contains two button on a selected item of grid view object.
Is that possible.
I added a gridview to my project and by using base adapter a template was loaded to each item of gridview. But what I want is that when I clicked an item of gridview, I want to load a new template (layout) to the selected item.
THE PROBLEM WAS SOLVED, followings are the edited codes
Base Adapter
public class KategoriAdapter extends BaseAdapter{
private Context mContext;
private String[] categoryValues;
private Bitmap[] pictures;
//indicate that positon for new template
private int mNewTemplatePos = -1;
public KategoriAdapter(Context context, String[] categoryValues, Bitmap[] pictures) {
this.mContext = context;
this.categoryValues = categoryValues;
this.pictures = pictures;
}
//apply new template to positon
public void useNewTemplate(int pos) {
mNewTemplatePos =pos;
//notiy list that data has changed and the list will refresh ui itself.
notifyDataSetChanged();
}
#Override
public int getCount() {
return categoryValues.length;
}
#Override
public Object getItem(int possition) {
return null;
}
#Override
public long getItemId(int possition) {
return 0;
}
#Override
public View getView(int possition, View convertView, ViewGroup parent) {
final LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
int posId = mNewTemplatePos;
if (convertView == null){
if (mNewTemplatePos ==possition){
convertView = getNewTemplate(inflater,possition);
}else {
convertView = getNormalTemplate(inflater,possition);
}
}else {
if (posId==possition){
convertView = getNewTemplate(inflater,possition);
}else{
convertView = getNormalTemplate(inflater,possition);
}
}
return convertView;
}
private View getNormalTemplate(LayoutInflater inflater, int possition) {
final View grid = inflater.inflate(R.layout.kategoriler_list_item, null);
TextView cName = (TextView) grid.findViewById(R.id.grid_item_ad);
ImageView categoryPictures = (ImageView) grid.findViewById(R.id.grid_item_resim);
cName.setText(categoryValues[possition]);
categoryPictures.setImageBitmap(pictures[possition]);
return grid;
}
private View getNewTemplate(LayoutInflater inflater, int possition) {
final View grid = inflater.inflate(R.layout.kategori_secenek_template, null);
TextView cName = (TextView) grid.findViewById(R.id.grid_item_ad);
cName.setText(categoryValues[possition]);
Button btn_nesne_tani = (Button) grid.findViewById(R.id.btn_nesneleri_taniyalim);
Button btn_cumle_kur = (Button) grid.findViewById(R.id.btn_cumle_kuralim);
btn_nesne_tani.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(mContext,"nesne",Toast.LENGTH_SHORT).show();
}
});
btn_cumle_kur.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(mContext,"cümle",Toast.LENGTH_SHORT).show();
}
});
return grid;
}
}
KategoriActivity.java
.....
final KategoriAdapter adapter = new KategoriAdapter(getApplicationContext(), mKategoriler, kategoriResimleri);
grid=(GridView)findViewById(R.id.gv_kategoriler);
grid.setAdapter(adapter);
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
adapter.useNewTemplate(position);
Toast.makeText(getApplicationContext(), mKategoriler[position].toString(),Toast.LENGTH_SHORT).show();
}
});
}
I have rewrite your KategoriAdapter class:
public class KategoriAdapter extends BaseAdapter {
private Context mContext;
private final String[] categoryValues;
private final Bitmap[] pictures;
//indicate that positon in list are all use new template
private List<Integer> mNewTemplatePos;
public ImageView categoryPictures;
//indicate that this is normal template view
private final String NORMAL_TEMPLATE = "NORMAL_TEMPLATE";
//indicate that this is new template view
private final String NEW_TEMPLATE = "NEW_TEMPLATE";
public KategoriAdapter(Context context, String[] categoryValues, Bitmap[] pictures) {
this.mContext = context;
this.categoryValues = categoryValues;
this.pictures = pictures;
this.mNewTemplatePos = new ArrayList<>();
}
//apply new template to positon
public void useNewTemplate(int pos) {
mNewTemplatePos.add(pos);
//notiy list that data has changed and the list will refresh ui itself.
notifyDataSetChanged();
}
#Override
public int getCount() {
return categoryValues.length;
}
#Override
public Object getItem(int possition) {
return null;
}
#Override
public long getItemId(int possition) {
return 0;
}
#Override
public View getView(int possition, View convertView, ViewGroup parent) {
final LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null) {
if (mNewTemplatePos.contains(possition)) {
convertView = getNewTemplate(inflater, possition);
//use tag to indicate the type of the template
convertView.setTag(NEW_TEMPLATE);
} else {
convertView = getNormalTemplate(inflater, possition);
convertView.setTag(NORMAL_TEMPLATE);
}
} else {
switch ((String) convertView.getTag()) {
case NORMAL_TEMPLATE:
//convertView is the normal template view but you need a new template view in possition
if (mNewTemplatePos.contains(possition))
convertView = getNewTemplate(inflater, possition);
break;
case NEW_TEMPLATE:
//convertView is the new template view but you need a normal template view in possition
if (!mNewTemplatePos.contains(possition))
convertView = getNormalTemplate(inflater, possition);
break;
}
}
return convertView;
}
private View getNormalTemplate(LayoutInflater inflater, int possition) {
View grid = inflater.inflate(R.layout.kategoriler_list_item, null);
TextView cName = (TextView) grid.findViewById(R.id.grid_item_ad);
categoryPictures = (ImageView) grid.findViewById(R.id.grid_item_resim);
cName.setText(categoryValues[possition]);
categoryPictures.setImageBitmap(pictures[possition]);
return grid;
}
private View getNewTemplate(LayoutInflater inflater, int possition) {
// TODO: 31/08/16 inflate you new template view layout here
return youNewTemplateView;
}
}
You should determine wether if current contentView is the right template type in getView() because contentView may be one of the new template in your list when it is not null.It is convenient to use tag to indicate the template type.
When to use useNewTemplate(position)?
Just apply the position that you need to use new template to useNewTemplate（） and use it in your onItemClick() method.
grid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
useNewTemplate(position);
}
});
While using a ViewPager i noticed that it wouldn't respond very quickly, meaning that it slows down when switchting through fragments, kind of in a laggy way.
Does anyone know how this code could be causing the issue?
public class List_adapter : BaseAdapter<Element>
{
public List<Element> _list;
FragmentOne _context;
public List_adapter(FragmentOne context, List<Element> list)
{
super(context, list);
_list = list;
_context = context;
}
#Override
public int getCount()
{
return _list.size();
}
#Override
public Object getItem(int position)
{
return _list.get(position);
}
#Override
public long getItemId(int position)
{
return getItem(position).hashCode();
}
#Override
public View getView(int position, View convertView, ViewGroup parent)
{
LayoutInflater inflater = (LayoutInflater)getActivity().getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.row, parent, false);
Element item = getItem(position);
TextView lbl = (TextView)view.findViewById(R.id.label);
TextView prop = (TextView)view.findViewById(R.id.Prop);
lbl.setText(item.getlabel());
prop.setText(item.getprop());
return view;
}
}
Use ViewHolder pattern for smooth list scrolling
Implement Offscreen page limit for initialising a view before showing it inside ViewPager
I used fragment in my app and i'm using SQLite to save local data. But when I finished saving data, and I swipe the page, my listView is not refreshed with new data (Only showing old data). I have tried to provide a method notifyDataSetChanged() on my adapter, but it's not working.
My Base Adapter class :
public class LocalDataAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<LocalDataBean> data;
private static LayoutInflater inflater = null;
public LocalDataAdapter(Activity a, ArrayList<LocalDataBean> d) {
activity = a;
data = d;
inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
public void setItem(ArrayList<LocalDataBean> data){
this.data = data;
notifyDataSetChanged();
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
View v = inflater.inflate(R.layout.list_item, null);
TextView nama_konsumen = (TextView) v.findViewById(R.id.nama_konsumen);
TextView no_telp = (TextView) v.findViewById(R.id.no_telp);
TextView no_hp_cdma = (TextView) v.findViewById(R.id.no_hp_cdma);
TextView no_hp_gsm = (TextView) v.findViewById(R.id.no_hp_gsm);
LocalDataBean obj = (LocalDataBean) getItem(position);
nama_konsumen.setText(obj.getNamaKonsumen());
no_telp.setText(obj.getNoTelp());
no_hp_cdma.setText(obj.getNoCMDA());
no_hp_gsm.setText(obj.getNoGSM());
return v;
}
}
My fragment class :
public class LocalDataFragment extends Fragment {
View view;
Activity act;
SQLHandlerBean utilSql;
ArrayList<LocalDataBean> localdatabean = new ArrayList<LocalDataBean>();
LocalDataAdapter adapter;
ListView list;
public static final String TAG = LocalDataFragment.class.getSimpleName();
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.layout_local_data, null);
act = getActivity();
list = (ListView) view.findViewById(R.id.listViewLocalData);
utilSql = new SQLHandlerBean(this.act);
adapter = new LocalDataAdapter(act, localdatabean);
localdatabean = new ArrayList<LocalDataBean>();
list.setAdapter(adapter);
if (utilSql.ReadAllLocalData().size() < 1) {
Toast.makeText(act, "DATA EMPTY!", Toast.LENGTH_LONG).show();
} else {
localdatabean = utilSql.ReadAllLocalData();
Log.e(TAG, "TOTAL DATA : "+localdatabean.size());
adapter.setItem(localdatabean);
adapter.notifyDataSetChanged();
}
return view;
}
}
Is adapter.notifyDataSetChanged() placement correct?
No, the placement is not in the right place.
As you have placed the notifyDataSetChanged() inside of the onCreateView() method. It will be only invoked 1st time the fragment is launched.
Rather you can add a refresh button in your layout (or in you action bar). And along with the insertion/deletion method of the data, place the notifyDataSetChanged() at the bottom of the click event of that button.
By doing this user can refresh the page whenever they want.
And if you want to refresh the page by swipping the view then, SwipeRefreshLaoyout could be a perfect alternative.
You can check this blog.
Android not parsing JSON data into ListView, I am using this tutorial and just made few changes in ListViewAdapter.java
Like in my new implementation i used ViewHolder, and my code looks like this:
public class ListViewAdapter extends BaseAdapter {
// Declare Variables
Context context;
ArrayList<HashMap<String, String>> data;
ImageLoader imageLoader;
HashMap<String, String> resultp = new HashMap<String, String>();
ViewHolder holder;
public ListViewAdapter(Context context,
ArrayList<HashMap<String, String>> arraylist) {
this.context = context;
data = arraylist;
imageLoader = new ImageLoader(context);
}
#Override
public int getCount() {
return data.size();
}
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
static class ViewHolder {
public ViewHolder(View convertView) {
// TODO Auto-generated constructor stub
}
TextView rank;
TextView country;
TextView population;
ImageView flag;
}
public View getView(final int position, View convertView, ViewGroup parent) {
// Declare Variables
// Avoid unneccessary calls to findViewById() on each row, which is expensive!
holder = null;
/*
* If convertView is not null, we can reuse it directly, no inflation required!
* We only inflate a new View when the convertView is null.
*/
if (convertView == null) {
convertView = ((Activity) context).getLayoutInflater().inflate(R.layout.listview_item, null);
// Create a ViewHolder and store references to the two children views
holder = new ViewHolder(convertView);
holder.rank = (TextView) convertView.findViewById(R.id.rank);
holder.country = (TextView) convertView.findViewById(R.id.country);
holder.population = (TextView) convertView.findViewById(R.id.population);
// Locate the ImageView in listview_item.xml
holder.flag = (ImageView) convertView.findViewById(R.id.flag);
// The tag can be any Object, this just happens to be the ViewHolder
convertView.setTag(holder);
} else {
// Get the ViewHolder back to get fast access to the TextView
// and the ImageView.
holder = (ViewHolder) convertView.getTag();
}
// Capture position and set results to the TextViews
holder.rank.setText(resultp.get(MainActivity.RANK));
holder.country.setText(resultp.get(MainActivity.COUNTRY));
holder.population.setText(resultp.get(MainActivity.POPULATION));
// Capture position and set results to the ImageView
// Passes flag images URL into ImageLoader.class
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG), holder.flag);
// Capture ListView item click
return convertView;
}
}
Edited: Click on ListItem code
#Override
protected void onPostExecute(Void args) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.listview);
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(MainActivity.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
// Close the progressdialog
mProgressDialog.dismiss();
listview.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
});
}
But i don't no why i am not getting data into ListView !
The issue is that you are not assigning the HashMap to `resultp that has the information you want to display
public View getView(final int position, View convertView, ViewGroup parent) {
holder = null;
if (convertView == null) {
convertView = ((Activity) context).getLayoutInflater().inflate(R.layout.listview_item, null);
holder = new ViewHolder(convertView);
holder.rank = (TextView) convertView.findViewById(R.id.rank);
holder.country = (TextView) convertView.findViewById(R.id.country);
holder.population = (TextView) convertView.findViewById(R.id.population);
holder.flag = (ImageView) convertView.findViewById(R.id.flag);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
// Here's the change
resultp = data.get(position);
// Here's the change
holder.rank.setText(resultp.get(MainActivity.RANK));
holder.country.setText(resultp.get(MainActivity.COUNTRY));
holder.population.setText(resultp.get(MainActivity.POPULATION));
imageLoader.DisplayImage(resultp.get(MainActivity.FLAG), holder.flag);
return convertView;
}
To attach OnItemClickListener to your ListView, in the Activity that contains the ListView, add the following:
public class MyActivity implements OnItemClickListener{
ListView lv;
#Override
public void onCreate(Bundle savedInstanceState() {
....
....
// lv initialized here
// adapter of lv set here
attachListeners();
}
private void attachListeners() {
....
....
// attach listeners to other views if you like
lv.setOnItemClickListener(this);
}
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
}
Or, if you don't want your Activity to implement OnItemClickListener, then,
public class MyActivity {
ListView lv;
#Override
public void onCreate(Bundle savedInstanceState() {
....
....
// lv initialized here
// adapter of lv set here
attachListeners();
}
private void attachListeners() {
....
....
// attach listeners to other views if you like
lv.setOnItemClickListener(new OnItemClickListener() {
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// code to handle click
}
});
}
}
First of all try to fix this:
#Override
public Object getItem(int position) {
return data.get(position);
}
#Override
public long getItemId(int position) {
return position;
}