We Keep Coding

Removing objects from listView in custom adapter

So I have an activity with a listview inside of it and when I click a delete button I want to remove the object from the list. I already know how to find which object I want to remove and remove it from the list that populates my array adapter but I am not sure what i need to do to call the .notifyDataSetChanged() routine which Is what I believe I need to do. Any help would be much appreciated.
My activity code
public class MealActivity2 extends AppCompatActivity {
private ListView lv;
public static ArrayList<Model> modelArrayList;
private CustomAdapter customAdapter;
private Button btnnext;
private String[] fruitlist = new String[]{"Apples", "Oranges", "Potatoes", "Tomatoes","Grapes"};
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_meal2);
Integer numFoodItems = ((Globals) getApplication()).getLength();
lv = (ListView) findViewById(R.id.lv);
btnnext = (Button) findViewById(R.id.next);
modelArrayList = getModel(numFoodItems);
customAdapter = new CustomAdapter(this);
lv.setAdapter(customAdapter);
btnnext.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MealActivity2.this,NextActivity.class);
startActivity(intent);
}
});
}
// this builds the array list of model opbjects that will be used by the adapter to populate
// the list view dynamically
private ArrayList<Model> getModel(Integer length){
ArrayList<Model> list = new ArrayList<>();
for(int i = 0; i < length; i++){
FoodDetailsPost food = ((Globals) getApplication()).getFoodList().get(i);
Model model = new Model();
model.setNumber(((Globals) getApplication()).getServing(i));
model.setFruit(food.getDescription());
list.add(model);
}
return list;
}
}
and here is my custom adapter code if you look near the end at the last comment that is where i need to notify my activity that I have changed the contents of the list and should update the displaying items
public class CustomAdapter extends BaseAdapter {
private Context context;
private adapterGlobalAccess g = new adapterGlobalAccess();
private CustomAdapter customAdapter;
public CustomAdapter(Context context) {
this.context = context;
}
#Override
public int getViewTypeCount() {
return getCount();
}
#Override
public int getItemViewType(int position) {
return position;
}
#Override
public int getCount() {
return MealActivity2.modelArrayList.size();
}
#Override
public Object getItem(int position) {
return MealActivity2.modelArrayList.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
holder = new ViewHolder(); LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.lv_item, null, true);
holder.tvFruit = (TextView) convertView.findViewById(R.id.animal);
holder.tvnumber = (TextView) convertView.findViewById(R.id.number);
holder.btn_edit = (Button) convertView.findViewById(R.id.plus);
holder.btn_minus = (Button) convertView.findViewById(R.id.minus);
convertView.setTag(holder);
}else {
// the getTag returns the viewHolder object set as a tag to the view
holder = (ViewHolder)convertView.getTag();
}
holder.tvFruit.setText(MealActivity2.modelArrayList.get(position).getFruit());
holder.tvnumber.setText(String.valueOf(MealActivity2.modelArrayList.get(position).getNumber()));
holder.btn_edit.setTag(R.integer.btn_plus_view, convertView);
holder.btn_edit.setTag(R.integer.btn_plus_pos, position);
holder.btn_edit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View tempview = (View) holder.btn_edit.getTag(R.integer.btn_plus_view);
TextView tv = (TextView) tempview.findViewById(R.id.number);
Integer pos = (Integer) holder.btn_edit.getTag(R.integer.btn_plus_pos);
Double number = Double.parseDouble(tv.getText().toString()) + 1;
tv.setText(String.valueOf(number));
MealActivity2.modelArrayList.get(pos).setNumber(number);
g.setServing(pos, number);
}
});
holder.btn_minus.setTag(R.integer.btn_minus_view, convertView);
holder.btn_minus.setTag(R.integer.btn_minus_pos, position);
holder.btn_minus.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
View tempview = (View) holder.btn_minus.getTag(R.integer.btn_minus_view);
TextView tv = (TextView) tempview.findViewById(R.id.number);
Integer pos = (Integer) holder.btn_minus.getTag(R.integer.btn_minus_pos);
((Globals) context.getApplicationContext()).remove(pos);
MealActivity2.modelArrayList.remove(pos);
// i need to do .notifyDataSetChanged() here but im not sure how
}
});
return convertView;
}

You can just use a interface to solve the problem
CustomAdapter
public class CustomAdapter extends BaseAdapter {
...
private CustomAdapterListener listener;
interface CustomAdapterListener{
void itemClick();
}
public CustomAdapter(Context context, CustomAdapterListener listener) {
this.context = context;
this.listener = listener;
}
MainActivity2
public class MealActivity2 extends AppCompatActivity implements CustomAdapterListener {
...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_meal2);
...
customAdapter = new CustomAdapter(this, this);
}
#Override
public void itemClick() {
// you can do .notifyDataSetChanged() here
}
after that you can use listener to callback to Activity and do anything you want
CustomAdapter
#Override
public void onClick(View v) {
listener.itemClick();
// i need to do .notifyDataSetChanged() here but im not sure how
}

Can't add Onclick action with button in listview row [duplicate]

This question already has an answer here:
Button inside SimpleCursorAdapter
(1 answer)
Closed 5 years ago.
I'm fresh n funky in android dev. I start learning and got stoped by clickable button in listview!
`public class Test2 extends AppCompatActivity {
private static final String TAG = "Test2";
Button btnEdytuj;
DatabaseHelper myDb;
SimpleCursorAdapter dataAdapter;`
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_test2);
myDb = new DatabaseHelper(this);
displayList();
}
private void displayList() {
Cursor cursor = myDb.getAllData();
String from[] = new String[]{myDb.COL_ID, myDb.COL_NAZWA, myDb.COL_LAT, myDb.COL_LON};
int to[] = new int[]{R.id.textView10, R.id.textView1, R.id.textView2, R.id.textView3};
dataAdapter = new SimpleCursorAdapter(this, R.layout.row_item_edit, cursor, from, to, 0);
ListView lv = (ListView) findViewById(R.id.listViewId);
lv.setAdapter(dataAdapter);
lv.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
btnEdytuj = (Button) view.findViewById(R.id.buttonEE);
btnEdytuj.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
// Do something
Intent intent = new Intent(Test2.this,Edytuj.class);
startActivity(intent);`
And my wish is to open new activity from list by intent trigger by pressing a row or a button and passing an id to handle editing.
I have found an error maybe it will helps to figure it out:
android.support.v7.widget.ListViewCompat.lookForSelectablePosition(int, boolean) would have incorrectly overridden the package-private method in android.widget.ListView

in your list adapter do this :
this for get view function :
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (inflater == null)
inflater = (LayoutInflater) activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (convertView == null)
convertView = inflater.inflate(R.layout.list_note, null);
btnEdytuj = (Button) convertView.findViewById(R.id.buttonEE);
btnEdytuj.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
// Do something
}
});
}
return convertView;
}
this other for bind view:
#Override
public void bindView(View view, Context context, Cursor cursor){
int row_id = cursor.get('_id'); //Your row id (might need to replace)
Button button = (Button) view.findViewById(R.id.buttonEE);
button.setOnClickListener(new OnClickListener(){
#Override
public void onClick(View v){
//ADD STUFF HERE you know which row is clicked. and which button
}
});
}

Here you go :
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
//Write your code here
}
});
Hope this helps.

You have to put the button onClick method inside Adapter class.
As you have used SimpleCursorAdapter, use button-inside-simplecursoradapter for reference.

Kindly write following code in your activity class.
MainActivity.java
ArrayList<MobileData> searchResults = getMobileData();
final ListView lv1 = (ListView) findViewById(R.id.ListView01);
lv1.setAdapter(new MobileAdapter(this, searchResults));
Add all list item by using adapter class and also add button event in adaptaer class.
MobileAdapter.java
public class MobileAdapter extends BaseAdapter {
private static ArrayList<MobileData> searchArrayList;
private LayoutInflater mInflater;
private Context context;
MobilezonDAO dao;
public MobileAdapter(Context context, ArrayList<MobileData> results) {
this.context = context;
searchArrayList = results;
mInflater = LayoutInflater.from(context);
dao = new MobilezonDAO(this.context);
}
public int getCount() {
return searchArrayList.size();
}
public Object getItem(int position) {
return searchArrayList.get(position);
}
public long getItemId(int position) {
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
final ViewHolder holder;
if (convertView == null) {
convertView = mInflater.inflate(R.layout.mobile_row_view, null);
holder = new ViewHolder();
holder.mobileImage = (ImageView) convertView.findViewById(R.id.mobileImage);
holder.mobileName = (TextView) convertView.findViewById(R.id.mobileName);
holder.mobilePrice = (TextView) convertView.findViewById(R.id.mobilePrice);
holder.mobileBrand = (TextView) convertView.findViewById(R.id.mobileBrand);
holder.viewDetails = (Button) convertView.findViewById(R.id.viewDetails);
holder.addToCart = (Button) convertView.findViewById(R.id.addToCart);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.mobileImage.setImageBitmap(searchArrayList.get(position).getMobileImage());
holder.mobileName.setText(searchArrayList.get(position).getMobileName());
holder.mobilePrice.setText("Price: $"+searchArrayList.get(position).getMobilePrice());
holder.mobileBrand.setText("Brand: "+searchArrayList.get(position).getMobileBrand());
holder.viewDetails.setBackgroundResource(R.drawable.view_details);
holder.viewDetails.setId(position);
holder.addToCart.setBackgroundResource(R.drawable.addtocart);
holder.viewDetails.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
MobileData mobileData = searchArrayList.get(holder.viewDetails.getId());
Intent intent= new Intent(context, MobileViewDetailsActivity.class);
intent.putExtra("ModelNumber", mobileData.getModelNumber());
context.startActivity(intent);
}
});
holder.addToCart.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
MobileData mobileData = searchArrayList.get(holder.viewDetails.getId());
CartData cartData = new CartData();
cartData.setUsername(emailid);
cartData.setModelNumber(mobileData.getModelNumber());
cartData.setPrice(mobileData.getMobilePrice());
cartData.setQuantity("1");
CartData tempCartData = dao.searchParticularCartData(cartData.getUsername(), cartData.getModelNumber());
if(tempCartData!=null && tempCartData.getQuantity()!=null && Integer.valueOf(tempCartData.getQuantity())>0){
Snackbar.make(view, "Selected Mobile already added in your cart.", Snackbar.LENGTH_LONG).setAction("Action", null).show();
}else{
dao.insertCartData(cartData);
Snackbar.make(view, "Mobile has been successfully added in your cart.", Snackbar.LENGTH_LONG).setAction("Action", null).show();
}
}
});
return convertView;
}
static class ViewHolder {
ImageView mobileImage;
TextView mobileName;
TextView mobilePrice;
TextView mobileBrand;
Button viewDetails;
Button addToCart;
}
}

Passing results (serializable class) from DialogFragment to Fragment

I have main activity which contains fragments. One of the fragment is calling dialogFragment for new item entry. This new item is specified by Serializable class.
Just to be more specific:
item.java
public class Item implements Serializable {
private String mTitle;
private String mDescription;
private Boolean mTrue;
//getters and setters
public String getTitle() {
return mTitle;
}
public void setTitle(String mTitle) {
this.mTitle = mTitle;
}
public String getDescription() {
return mDescription;
}
public void setDescription(String mDescription) {
this.mDescription = mDescription;
}
public Boolean isTrue() {
return mTrue;
}
public void setTrue(Boolean mTrue) {
this.mTrue = mTrue;
}
}
DialogNewItem
public class DialogNewItem extends DialogFragment {
//filters state holder
Boolean isTrue = false;
//filters state end
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public Dialog onCreateDialog(Bundle savedInstanceState){
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View dialogView = inflater.inflate(R.layout.new_item, null);
final EditText editTitle = (EditText) dialogView.findViewById(R.id.editTitle);
final EditText editDescription = (EditText) dialogView.findViewById(R.id.editDescription)
//filter icons
final ImageView ivIsTrue = (ImageView) dialogView.findViewById(R.id.filterTrue);
//filter icons end
//onClickListener for filter icons
ivIsTrue.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
if (isTrue == false) {
ivIsTrue.setBackgroundResource(R.drawable.border_white);
ivIsTrue.setImageResource(R.drawable.true_white);
isTrue = true;
} else {
ivIsTrue.setBackgroundResource(R.drawable.border_green);
ivIsTrue.setImageResource(R.drawable.true_green);
isTrue = false;
}
}
});
Button btnCancel = (Button) dialogView.findViewById(R.id.btnCancel);
Button btnOK = (Button) dialogView.findViewById(R.id.btnOK);
builder.setView(dialogView);
//cancel button
btnCancel.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
dismiss();
}
});
//give button
btnOK.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//new item
final Item newItem = new Item();
//Set its variables to match the users entries on the form
newItem.setTitle(editTitle.getText().toString());
newItem.setDescription(editDescription.getText().toString());
newItem.setTrue(isTrue);
dismiss();
}
});
return builder.create();
}
}
Now, I want to pass newItem from DialogNewItem (btnOK) to a listView Fragment. In other words I want to make a listView Fragment which will contain all the new items created in DialogNewItem.
I was trying different methods (set/getFragment, ArrayList, different interfaces, etc) but some how non of it works. I have no problem with passing newItem to listView in an activity:
//get the reference to dashboard
Dashboard callingActivity = (Dashboard) getActivity();
//pass new item back to dashboard
callingActivity.createNewItem(newItem);
and then dashboard activity:
public class Dashboard extends AppCompatActivity {
private ItemAdapter mItemAdapter;
public void createNewItem(Item n) {
mItemAdapter.addItem(n);
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_dashboard);
mItemAdapter = new ItemAdapter();
ListView listItem = (ListView) findViewById(R.id.listView);
listItem.setAdapter(mItemAdapter);
}
//handle clicks on listView
listItem.setOnItemClickListener(new AdapterView.OnItemClickListener(){
#Override
public void onItemClick (AdapterView<?> adapter, View view, int whichItem, long id ){
//creating temporary item which is reference to the clicked item
Item tempItem = mItemAdapter.getItem(whichItem);
//new dialog window
DialogShowItem dialog = new DialogShowItem();
//send reference to the item to be shown
dialog.sendItemSelected(tempItem);
//show the dialog window with the item
dialog.show(getFragmentManager(),"");
}
});
#Override
public View getView(int whichItem, View view, ViewGroup viewGroup){
//has been inflated already
if (view==null){
//creating layout inflater
LayoutInflater inflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);
//instantiate view by inflating inflater (listItem layout)
view = inflater.inflate(R.layout.listitem, viewGroup, false);
}
Item tempItem = itemList.get(whichItem);
//grabbing the refrence to all variables
TextView txtTitle = (TextView) view.findViewById(R.id.txtTitle);
TextView txtDescription = (TextView) view.findViewById(R.id.txtDescription);
ImageView ivTrue = (ImageView) view.findViewById(R.id.imgSmTrue);
//setting text variables
txtTitle.setText(tempItem.getTitle());
txtDescription.setText(tempItem.getDescription());
//hide not relevant images
if (!tempItem.isTrue()){
ivTrue.setVisibility(View.INVISIBLE);
} else {ivTrue.setVisibility(View.VISIBLE);}
//category with different image src
return view;
}
and everything works perfectly, but when I want to do the same with Fragment instead of Activity, somehow I cannot make it work.
I would appreciate any help. Thanx
Fragment (with listview):
public class ListItems extends ListFragment {
private ItemAdapter mItemAdapter;
public void createNewItem(Item i) {
mItemAdapter.addItem(i);
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstatceState) {
View view = inflater.inflate(R.layout.list_items, container, false);
//Item adapter
mItemAdapter = new ItemAdapter();
final ListView listItems = (ListView) view.findViewById(R.id.listView);
listItems.setAdapter(mItemAdapter);
//floating give button
FloatingActionButton fab = (FloatingActionButton) view.findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
DialogNewItem dialog = new DialogNewItem();
dialog.show(getFragmentManager(), "");
}
});
//handle clicks on itemList
listItems.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int whichItem, long id) {
Item tempItem = mItemAdapter.getItem(whichItem);
DialogShowItem dialog = new DialogShowItem();
dialog.sendItemSelected(tempItem);
dialog.show(getFragmentManager(), "");
}
});
return view;
}
#Override
protected void onPause() {
super.onPause();
mItemAdapter.saveItems();
}
public class ItemAdapter extends BaseAdapter {
List<Item> itemList = new ArrayList<Item>();
private JSONSerializer mSerializer;
public ItemAdapter() {
mSerializer = new JSONSerializer("myProject.json", getActivity().getApplicationContext());
try {
itemList = mSerializer.load();
} catch (Exception e) {
itemList = new ArrayList<Item>();
Log.e("Error loading items: ", "", e);
}
}
public void saveItems() {
try {
mSerializer.save(itemList);
} catch (Exception e) {
Log.e("Error saving items: ", "", e);
}
}
#Override
public int getCount() {
return itemList.size();
}
#Override
public Item getItem(int whichItem) {
return itemList.get(whichItem);
}
#Override
public long getItemId(int whichItem) {
return whichItem;
}
public void addItem(Item n) {
itemList.add(n);
notifyDataSetChanged();
}
#Override
public View getView(int whichItem, View view, ViewGroup viewGroup) {
if (view==null) {
LayoutInflater inflater = (LayoutInflater) getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
view = inflater.inflate(R.layout.list_items, viewGroup, false);
}
Item tempItem = itemList.get(whichItem);
TextView txtTitle = (TextView) view.findViewById(R.id.txtTitle);
TextView txtDescription = (TextView) view.findViewById(R.id.txtDescription);
ImageView ivTrue = (ImageView) view.findViewById(R.id.imgSmTrue);
//setting text variables
txtTitle.setText(tempItem.getTitle());
txtDescription.setText(tempItem.getDescription());
//hide irrelevant images
if (!tempItem.isTrue()){
ivTrue.setVisibility(View.INVISIBLE);
} else {ivTrue.setVisibility(View.VISIBLE);}
return view;
}
}
}
It's a drawer activity so I'm showing it after drawer item click:
private void switchFragment(int position) {
Fragment fragment = null;
String fragmentID = "";
switch (position) {
case 0:
fragmentID = "LISTITEMS";
fragment = new ListItems();
break;
case 1:
fragmentID = "PROFILE";
fragment = new Profile();
break;
default:
break;
}
FragmentManager fragmentManager = getFragmentManager();
fragmentManager.beginTransaction().replace(R.id.fragmentHolder, fragment, fragmentID).commit();
//close the drawer
mDrawerLayout.closeDrawer(mNavDrawerList);
}

You can make a public method in ListItems fragment class in which you receive an Item class object and add it in adapter. And then inside your DialogNewItem Fragment, On OK Button click, you can search the ListItems using SupportFragmentManager by using its tag and call the public method you wrote.
The following code might help you.
DialogNewItem class
btnOK.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//new item
final Item newItem = new Item();
//Set its variables to match the users entries on the form
newItem.setTitle(editTitle.getText().toString());
newItem.setDescription(editDescription.getText().toString());
newItem.setTrue(isTrue);
FragmentManager manager = getActivity().getSupportFragmentManager();
ListItems fragment = (ListItems)manager.findFragmentByTag("LISTITEMS");
if(fragment != null){
fragment.createNewItem(newItem);
}
dismiss();
}
});
In your ListItems fragment the following code will depict an ItemAdapter as the data member of the ListViewFragment class and below that is the method you can call to add the item in the adapter.
private ItemAdapter mItemAdapter;
public void createNewItem(Item n) {
mItemAdapter.addItem(n);
}

Can't swiping between fragments in viewpager with buttons

I would change fragment in the viewpager using a button in every fragment. So in the fragment in position 0 i have a button and onClick i'll change in second fragment (position 1) and so on. Actually i'm using this code in the fragment at position 0:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.open_welcome_fragment_layout, container,
false);
final WelcomeViewPager pagerV = new WelcomeViewPager();
Button nextBtnOpen = (Button)view.findViewById(R.id.button_next_open);
nextBtnOpen.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
((WelcomeViewPager)getActivity()).setCurrentItem(1, true);
}
});
return view;
}
position 1:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.firstwelcomefrg, container, false);
final WelcomeViewPager pagerV = new WelcomeViewPager();
Button nextBtn = (Button)view.findViewById(R.id.button_next_one);
nextBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
((WelcomeViewPager)getActivity()).setCurrentItem(2, true);
}
});
return view;
}
position 2:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.secondwelcomefrg, container,
false);
final WelcomeViewPager pagerV = new WelcomeViewPager();
Button nextBtnTwo = (Button)view.findViewById(R.id.button_next_two);
nextBtnTwo.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
((WelcomeViewPager)getActivity()).setCurrentItem(3, true);
}
});
return view;
}
and in my ViewPager Activity i created this method:
public void setCurrentItem (int item, boolean smoothScroll) {
mViewPager.setCurrentItem(item, smoothScroll);
}
unfortunatelly not works. I can change from first to second fragment but every fragment returns to second.. Seems that the only one position accepted is the first one. In this case:
((WelcomeViewPager)getActivity()).setCurrentItem(1, true);
why this behaviour?

I think what you are trying to do is to have tabs and each tab to help switch between views. You should use actionBar tabs for this, not buttons.
This should help. It is a pretty detailed tutorial.

Do you want Button ? I use for similary problem solving with listener. Example of code below. Maybe help.
PagerActivity.java
import com.example.zzztest2.MyPagerAdapter.OnPagerItemSelected;
public class PagerActivity extends Activity implements OnPagerItemSelected {
ViewPager viewPager;
ArrayList<Bitmap> bitmapArray=null;
ArrayList<String> textArray=null;
ArrayList<String> urlArray=null;
int pagexi;
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reklamapager);
viewPager = (ViewPager) findViewById(R.id.view_pager);
//setting adapter
new readAsync().execute();
}//end oncreate
//switch page
public void pagerItemSelected(int newposition) {
viewPager.setCurrentItem(newposition);
}
Setting my adapter in onpostexecute Async
protected void onPostExecute(String file_url) {
MyPagerAdapter adapter = new MyPagerAdapter(PagerActivity.this, textArray, urlArray, bitmapArray, PagerActivity.this );
viewPager.setAdapter(adapter);
//start position
int pagexi = 2;
viewPager.setCurrentItem(pagexi);
}
MyPagerAdapte.java
public class MyPagerAdapter extends PagerAdapter {
Context context;
OnPagerItemSelected mListener;
ArrayList<String> textArray;
ArrayList<String> urlArray;
ArrayList<Bitmap> bitmapArray;
ImageView imageView;
TextView textreklama1;
Button btnSwitchPage;
public Activity activity;
String firmax;
String adresarx;
MyPagerAdapter(Context context, ArrayList<String> textArray, ArrayList<String> urlArray, ArrayList<Bitmap> bitmapArray, OnPagerItemSelected listener){
this.context=context;
this.textArray=textArray;
this.urlArray=urlArray;
this.bitmapArray=bitmapArray;
this.mListener = listener;
}
#Override
public int getCount() {
return textArray.size();
}
public Object instantiateItem(ViewGroup collection, int position) {
LayoutInflater inflater = (LayoutInflater) collection.getContext()
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.reklamator_new, null);
String indexx = textArray.get(position).toString();
String delims2 = "[;]+";
String[] riadokxxx = indexx.split(delims2);
String ucex = riadokxxx[0].trim();
String dokx = riadokxxx[1].trim();
EditText inputUce = (EditText) view.findViewById(R.id.inputUce);
inputUce.setText(ucex);
EditText inputDok = (EditText) view.findViewById(R.id.inputDok);
inputDok.setText(dokx);
btnSwitchPage = (Button) view.findViewById(R.id.btnSwitchPage);
btnSwitchPage.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
//here set new position
int xxx=1;
mListener.pagerItemSelected(xxx);
}
});
((ViewGroup) collection).addView(view, 0);
return view;
}
#Override
public void destroyItem(ViewGroup arg0, int arg1, Object arg2) {
((ViewGroup) arg0).removeView((View) arg2);
}
#Override
public boolean isViewFromObject(View arg0, Object arg1) {
return arg0 == ((View) arg1);
}
//new position
public interface OnPagerItemSelected {
void pagerItemSelected(int xxx);
}
}

Custom listview and Sherlock List Fragment

In my application I'm trying to make navigation between pages by Dropdown navigation menu, but when i'm running the application there is no items in my list
Main Activity
public class Main extends SherlockFragmentActivity implements OnNavigationListener{
//----------------------------------New Variables
private static final String KEY_MODELS="models";
private static final String KEY_POSITION="position";
private static final String[] labels= { "All", "Downloads","Completed","Later" };
private CharSequence[] models=new CharSequence[4];
private DownloadList frag=null;
private int lastPosition=-1;
//----------------------------------
ActionBar act;
ViewPager myviewpager;
int mSelectedPageIndex=1;
DownloadService downloadservice;
Intent serviceIntent ;
#Override
public void onCreate(Bundle state) {
super.onCreate(state);
frag=(DownloadList)getSupportFragmentManager().findFragmentById(android.R.id.content);
if (frag==null) {
frag=new DownloadList();
getSupportFragmentManager().beginTransaction()
.add(android.R.id.content, frag).commit();
}
if (state != null) {
models=state.getCharSequenceArray(KEY_MODELS);
}
if (downloadservice==null)
downloadservice= new DownloadService();
ArrayAdapter<String> nav=null;
act=getSupportActionBar();
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.ICE_CREAM_SANDWICH)
{
nav= new ArrayAdapter<String>(act.getThemedContext(),
android.R.layout.simple_spinner_item,labels);
}
else
{
nav=new ArrayAdapter<String>(this,android.R.layout.simple_spinner_item,labels);
}
nav.setDropDownViewResource(android.R.layout.simple_list_item_1);
act.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
act.setDisplayShowTitleEnabled(false);
act.setHomeButtonEnabled(false);
act.setListNavigationCallbacks(nav, this);
if (state != null) {
act.setSelectedNavigationItem(state.getInt(KEY_POSITION));
}
serviceIntent= new Intent(Main.this,downloadservice.getClass());
if (startService(serviceIntent)==null)
startService(serviceIntent);
act.setTitle("");
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater infalter = getSupportMenuInflater();
infalter.inflate(R.menu.mymenu, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId()==R.id.sub1)
{
AlertDialog.Builder alert = new AlertDialog.Builder(this);
alert.setTitle("Downlaod New File");
alert.setMessage("Enter URL");
final EditText input = new EditText(this);
alert.setView(input);
input.setText( "http://205.196.123.184/ddpha7c5b8lg/616c36j0d1xbztf
/Lecture+ppt+Ch2.ppt");
alert.setPositiveButton("Ok", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
String value = input.getText().toString();
downloadservice.addandstart(value);
Log.d("value",value);
}
});
alert.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
}
});
alert.show();
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
#Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
lastPosition=itemPosition;
frag=(DownloadList)getSupportFragmentManager().findFragmentById(android.R.id.content);
return false;
}
Custom adapter and SherlockFragmentList
public class DownloadList extends SherlockListFragment {
int index=0;
Button downloadButton;
Button pauseButton;
Button resumeButton;
TextView textLink;
TextView progressbar;
DownloadService downloadservice= new DownloadService();
MyAdapter listadapter;
Intent serviceIntent ;
String state;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getActivity().setContentView(R.layout.downloadlist);
setListAdapter(new MyAdapter(getSherlockActivity(), downloadservice.downloads));
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle
savedInstanceState) {
View rootView = inflater.inflate(R.layout.downloadlist, container, false);
setListAdapter(new MyAdapter(getSherlockActivity(), downloadservice.downloads));
return rootView;
}
int getIndex()
{
return index;
}
public class MyAdapter extends ArrayAdapter<NewDownload>
{
private final List<NewDownload> list;
//private final Activity context;
Thread t;
public MyAdapter(Context context,List<NewDownload> list) {
super(context, R.layout.list_item, list);
// this.context = (Activity) context;
this.list = list;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater)
getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View row = inflater.inflate(R.layout.list_item, null);
pauseButton = (Button) row.findViewById(R.id.btn1);
resumeButton = (Button) row.findViewById(R.id.btn2);
textLink = (TextView) row.findViewById(R.id.tv1);
progressbar = (TextView) row.findViewById(R.id.progressBar1);
textLink.setText(downloadservice.downloads.get(position).getName());
progressbar.setBottom(downloadservice.downloads.get(position).getDownloadedSize());
progressbar.setTop(downloadservice.downloads.get(position).getTotalSize());
final int p = position;
final NewDownload r = list.get(p);
if (r.state=="downloading")
{
progressbar.setText("DownLoading...");
pauseButton.setEnabled(true);
resumeButton.setEnabled(false);
}
else if (r.state=="pause")
{
pauseButton.setEnabled(false);
resumeButton.setEnabled(true);
progressbar.setText(r.state);
}
pauseButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
downloadservice.pause(p);
setListAdapter(listadapter );
}
});
resumeButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (getActivity().startService(serviceIntent)==null)
getActivity().startService(serviceIntent);
downloadservice.resume(p);
setListAdapter(listadapter );
}
});
return row;
}
}
Anyone can tell me how to implement my list right and where is my mistake ?
thx a lot

Don't set the layout from your fragment big no no!
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// getActivity().setContentView(R.layout.downloadlist); // Never do this!
// Also this will do nothing remove this! This should be in your `onActivityCreated()`
// setListAdapter(new MyAdapter(getSherlockActivity(), downloadservice.downloads));
}
Don't override onCreateView in your Fragment, SherlockListFragment creates the ListView layout for you.
If you want to set the adapter, remove your onCreateView and set you adapter in onActivityCreated()
#Override
public void onActivityCreated(Bundle saveState){
setListAdapter(new MyAdapter(getSherlockActivity(), downloadservice.downloads));
}
Setting your setListAdapter(listadapter ); in your Adapter getView is wrong too. If you update your List<?> of data make sure you call notifyDataSetChanged() from the mainThread after you update the list.
Otherwise make sure you layout has a ListView with android:id="#android:id/list" defined otherwise SherlockListView won't have a view to set the adapter too.