Develop Reference

Turn Activity with getHttpResponse to Fragment

I find it hard to use Fragment because I still don't have enough knowledge about it, so I tried to create my project using an Activity class first, but I still have to convert it into fragment cause I was using a left nav. I need someone's guide because I can't seem to find anything on the internet
Everything turns out to be fine but when I change this section of the code
new ReportsTab.GetHttpResponse(ReportsTab.this).execute();
It would display an error "Gethttpresponse cannot be applied"
This is my Activity Class
public class Reports extends AppCompatActivity {
ListView ReportsListView;
ProgressBar progressBar;
Button status;
String HttpUrl = "http://................../reports_app2.php";
List<String> IdList = new ArrayList<>();
AlertDialog alertDialog;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_reports);
ReportsListView = (ListView)findViewById(R.id.listview1);
progressBar = (ProgressBar)findViewById(R.id.progressBar);
new GetHttpResponse(Reports.this).execute();
//Adding ListView Item click Listener.
ReportsListView.setOnItemClickListener(new AdapterView.OnItemClickListener()
{
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
// TODO Auto-generated method stub
Intent intent = new Intent(Reports.this,MainActivity.class);
// Sending ListView clicked value using intent.
intent.putExtra("ListViewValue", IdList.get(position).toString());
startActivity(intent);
//Finishing current activity after open next activity.
finish();
}
});
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer);
mToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.open, R.string.close);
mDrawerLayout.addDrawerListener(mToggle);
NavigationView nvDrawer = (NavigationView) findViewById(R.id.nv);
mToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
setupDrawerContent(nvDrawer);
}
private class GetHttpResponse extends AsyncTask<Void, Void, Void>
{
public Context context;
String JSonResult;
List<ReportsJava> ReportsList;
public GetHttpResponse(Context context)
{
this.context = context;
}
#Override
protected void onPreExecute()
{
super.onPreExecute();
}
#Override
protected Void doInBackground(Void... arg0)
{
// Passing HTTP URL to HttpServicesClass Class.
HttpServicesClass httpServicesClass = new HttpServicesClass(HttpUrl);
try
{
httpServicesClass.ExecutePostRequest();
if(httpServicesClass.getResponseCode() == 200)
{
JSonResult = httpServicesClass.getResponse();
if(JSonResult != null)
{
JSONArray jsonArray = null;
try {
jsonArray = new JSONArray(JSonResult);
JSONObject jsonObject;
ReportsJava reports;
ReportsList = new ArrayList<ReportsJava>();
for(int i=0; i<jsonArray.length(); i++)
{
reports = new ReportsJava();
jsonObject = jsonArray.getJSONObject(i);
// Adding Student Id TO IdList Array.
IdList.add(jsonObject.getString("id").toString());
//Adding Student Name.
if("0".equals(jsonObject.getString("status").toString()))
{
reports.LightpostStatus = "BLACKOUT";
}
else if("1".equals(jsonObject.getString("status").toString()))
{
reports.LightpostStatus = "FIXED";
}
else if("2".equals(jsonObject.getString("status").toString()))
{
reports.LightpostStatus = "DEFECTIVE";
}
reports.LightpostName = jsonObject.getString("lightpost_code").toString();
reports.LightpostAddress = jsonObject.getString("lightpost_location").toString();
reports.LightpostTime = jsonObject.getString("lightpost_time").toString();
ReportsList.add(reports);
}
}
catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
else
{
Toast.makeText(context, httpServicesClass.getErrorMessage(), Toast.LENGTH_SHORT).show();
}
}
catch (Exception e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
return null;
}
#Override
protected void onPostExecute(Void result)
{
progressBar.setVisibility(View.GONE);
ReportsListView.setVisibility(View.VISIBLE);
ReportsListAdapterClass adapter = new ReportsListAdapterClass(ReportsList, context);
ReportsListView.setAdapter(adapter);
}
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.menuLogout:
SharedPrefManager.getInstance(this).logout();
finish();
startActivity(new Intent(this, MainActivity.class));
break;
case R.id.menuSettings:
Toast.makeText(this, "You clicked settings", Toast.LENGTH_LONG).show();
break;
}
return true;
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
return true;
}
public void selectItemDrawer(MenuItem menuItem){
Fragment myFragment = null;
Class fragmentClass;
switch (menuItem.getItemId()){
case R.id.viewlights:
fragmentClass= ViewLightpost.class;
break;
case R.id.viewreports:
fragmentClass= ReportsTab.class;
break;
case R.id.viewaccount:
fragmentClass= EditAccount.class;
break;
case R.id.viewabout:
fragmentClass= AboutTab.class;
break;
default:
fragmentClass= ViewLightpost.class;
}
try{
myFragment=(Fragment) fragmentClass.newInstance();
}
catch (Exception e)
{
e.printStackTrace();
}
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flcontent,myFragment).commit();
menuItem.setChecked(true);
setTitle(menuItem.getTitle());
mDrawerLayout.closeDrawers();
}
private void setupDrawerContent(NavigationView navigationView){
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
selectItemDrawer(item);
return false;
}
});
}
}

new ReportsTab.GetHttpResponse(ReportsTab.this.getActivity()).execute();
Get the activity from the fragment instance.

Progress Dialog not showing I have tried all possible solutions but nothing worked

Progress Dialog not showing I have tried all possible solutions but nothing worked
This is my java code where I am creating an object of ProgressDialog and initialized it as well but still, it is not visible on my activity
Am I Starting Service OnCreate as well maybe it affecting my ProgressDialog Is'nt it?
public class MainActivity extends AppCompatActivity {
private ProgressDialog pDialog;
private ArrayList<CoinDetail> arrayList;
private FloatingActionButton fab_Coin;
private ListView coin_details_listView;
private CoinDetailsAdapter adapter;
private Toolbar toolbar;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
pDialog = new ProgressDialog(this);
pDialog.setMessage("Loading...");
pDialog.setCancelable(false);
pDialog.show();
toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
toolbar.setTitleTextColor(Color.WHITE);
getSupportActionBar().setTitle("Crypto Live");
Intent i = new Intent(MainActivity.this, ServiceCoin.class);
startService(i);
/*mInterstitialAd = newInterstitialAd(); //For ad
loadInterstitial();*/
coin_details_listView = findViewById(R.id.lv_coinName_mainActivity);
fab_Coin = findViewById(R.id.fab_add_coin);
arrayList = new ArrayList<>();
adapter = new CoinDetailsAdapter(MainActivity.this, arrayList);
coin_details_listView.setAdapter(adapter);
CoinSingleton.getInstance().setContext(this);
adapter = CoinSingleton.getInstance().getCoinDetailsAdapter(pDialog);
coin_details_listView.setAdapter(adapter);
coin_details_listView.setTextFilterEnabled(true);
fab_Coin.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent intent = new Intent(MainActivity.this, FabCoins.class);
startActivity(intent);
}
});
coin_details_listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent intent = new Intent(MainActivity.this, CoinDetails.class);
intent.putExtra("SHORT", CoinSingleton.getInstance().getCoinDetails().get(position).getShort());
startActivity(intent);
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu2, menu);
// Retrieve the SearchView and plug it into SearchManager
SearchView searchView = (SearchView) MenuItemCompat.getActionView(menu.findItem(R.id.action_search));
SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE);
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
if (TextUtils.isEmpty(newText)) {
coin_details_listView.clearTextFilter();
} else {
coin_details_listView.setFilterText(newText);
}
return true;
}
});
return true;
}
}
CoinSingleton java class
public class CoinSingleton {
private Context context;
private static CoinSingleton singleton = null;
private ArrayList<CoinDetail> coinDetails = new ArrayList<>();
private CoinDetailsAdapter coinDetailsAdapter;
public void setCoinDetails(ArrayList<CoinDetail> coinDetails) {
this.coinDetails = coinDetails;
}
/* A private Constructor prevents any other
* class from instantiating.
*/
private CoinSingleton() {
}
/* Static 'instance' method */
public static CoinSingleton getInstance() {
if (singleton == null) {
singleton = new CoinSingleton();
}
return singleton;
}
public void setContext(Context context) {
this.context = context;
}
public void setCoinDetailsAdapter(ArrayList<CoinDetail> details) {
for (int i = 0; i < details.size(); i++) {
try {
coinDetails.get(i).setPrice(details.get(i).getPrice());
coinDetails.get(i).setMktcap(details.get(i).getMktcap());
} catch (Exception e) {
coinDetails.add(details.get(i));
}
}
coinDetailsAdapter.setCoinDetailsArrayList(coinDetails);
//Toast.makeText(context, "Adapter set"+details.get(0).getPrice()+details.get(0).getShort(), Toast.LENGTH_SHORT).show();
coinDetailsAdapter.notifyDataSetChanged();
}
public CoinDetailsAdapter getCoinDetailsAdapter(ProgressDialog dialog) {
coinDetailsAdapter = new CoinDetailsAdapter(context, coinDetails);
dialog.dismiss();
return coinDetailsAdapter;
}
public ArrayList<CoinDetail> getCoinDetails() {
return coinDetails;
}
}

I think you are missing progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
ProgessDialog progressDialog = new ProgressDialog(ctx);
progressDialog.setMessage("Updating...");
progressDialog.setIndeterminate(true);
progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
progressDialog.setCancelable(false);
Edit
new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
#Override
public void run() {
pDialog = new ProgressDialog(MainActivity.this);
pDialog.setMessage("Loading...");
pDialog.setCancelable(false);
pDialog.show();
}
},100);

The problem is you're passing pDialog and dismissing. dialog.dismiss() removes your dialog.
public CoinDetailsAdapter getCoinDetailsAdapter(ProgressDialog dialog) {
coinDetailsAdapter = new CoinDetailsAdapter(context, coinDetails);
dialog.dismiss();
return coinDetailsAdapter;
}
if you want to dismiss dialog with delay try this code. Your dialog will be dismissed after 3 seconds.
public CoinDetailsAdapter getCoinDetailsAdapter(final ProgressDialog dialog) {
coinDetailsAdapter = new CoinDetailsAdapter(context, coinDetails);
new Handler(Looper.getMainLooper()).postDelayed(new Runnable() {
#Override
public void run() {
pDialog.dismiss();
}
}, 3000);
return coinDetailsAdapter;
}

Mimic the back button on the actionbar

So I have the action bar back button which returns me from an activity to my main activity. The problem I have is that it calls loadData() (which loads data from an API) when you press the action bar back button.
If I press the back button on the device (the button beside the home button) then I will be brought back to the previous view (the mainactivity) and won't have to call the API again.
So I'm trying to find a way to mimic the physical back button as an action bar widget.
I don't want MainActivity's code to be called again as it will execute another API call (I can only have 5 per minute) and it is also slower. I just want it to go back to the view I was just at.
public class MainActivity extends AppCompatActivity {
private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;
private ArrayList<ListItem> listItems;
private String defaultQuery = "ham";
private String builtURL;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
recyclerView = findViewById(R.id.recycler_view);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
listItems = new ArrayList<>();
loadData(defaultQuery);
}
#Override
public boolean onCreateOptionsMenu(final Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
final SearchView searchView = (SearchView) menu.findItem(R.id.action_search).getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
listItems.clear();
loadData(query);
(menu.findItem(R.id.action_search)).collapseActionView();
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
return false;
}
});
searchView.setIconified(false);
return true;
}
public void loadData(String query) {
final ProgressDialog progressDialog = new ProgressDialog(this);
progressDialog.setMessage("Loading recipes...");
progressDialog.show();
Log.d("q", "loadData: " + query);
builtURL = buildURL(query);
StringRequest request = new StringRequest(Request.Method.GET,
builtURL,
new Response.Listener<String>() {
#Override
public void onResponse(String response) {
progressDialog.dismiss();
if(response == null) {
response = "THERE WAS AN ERROR";
}
try {
JSONObject obj = new JSONObject(response);
JSONArray hits = obj.getJSONArray("hits");
for (int i = 0; i < hits.length(); i++) {
JSONObject a = hits.getJSONObject(i);
JSONObject recipe = a.getJSONObject("recipe");
String ingredients = recipe.getString("ingredientLines");
ingredients = ingredients.replace("[", "");
ingredients = ingredients.replace("]", "");
ingredients = ingredients.replace("\"", "");
ingredients = ingredients.replace("\\", "");
ingredients = ingredients.replace(",", "\n");
ListItem item = new ListItem(
recipe.getString("label"),
recipe.getString("source"),
recipe.getString("image"),
ingredients,
recipe.getString("url")
);
listItems.add(item);
}
adapter = new Adapter(listItems, getApplicationContext(), builtURL);
recyclerView.setAdapter(adapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
progressDialog.dismiss();
Toast.makeText(getApplicationContext(), error.getMessage(), Toast.LENGTH_LONG).show();
}
});
RequestQueue rq = Volley.newRequestQueue(this);
rq.add(request);
}
private String buildURL(String query) {
Log.d("q", "buildURL: " + query);
Uri.Builder builder = new Uri.Builder();
//url built here but I removed it because it shows API key etc.
String urlToSend = builder.build().toString();
//debugging purposes to show the url created
Log.d("url", "doInBackground: " + urlToSend);
return urlToSend;
}
#Override
public boolean onNavigateUp(){
finish();
return true;
}
This is the activity that I'm coming from.
public class recipe_view extends AppCompatActivity {
ImageView ivRecipeImage;
TextView tvRecipeName;
TextView tvRecipeCreator;
TextView tvRecipeIngredients;
String url;
Integer pos;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recipe_view);
Bundle data = getIntent().getExtras();
ArrayList<ListItem> list = data.getParcelableArrayList("list");
pos = data.getInt("pos");
for (int i = 0; i < list.size() ; i++) {
System.out.println(list.get(i));
System.out.println(pos);
}
ivRecipeImage = findViewById(R.id.recipeImage);
tvRecipeName = findViewById(R.id.recipeName);
tvRecipeCreator = findViewById(R.id.recipeCreator);
tvRecipeIngredients = findViewById(R.id.ingredients);
tvRecipeName.setText(list.get(pos).getTitle());
tvRecipeCreator.setText(list.get(pos).getAuthor());
Picasso.with(getApplicationContext())
.load(list.get(pos).getImageUrl())
.centerCrop()
.fit()
.into(ivRecipeImage);
tvRecipeIngredients.setText(list.get(pos).getListOfIngredients());
url = list.get(pos).getRecipeUrl();
final Button button = findViewById(R.id.bViewInstructions);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent goToBrowser = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(goToBrowser);
}
});
}
}

In your manifest xml
set
<activity
android:name=".your_activity"
android:label="#string/title_activity_sign_up"
android:parentActivityName=".whateveractivity"
android:screenOrientation="portrait" >
</activity>
then in code
#Override
public void onBackPressed() {
NavUtils.navigateUpFromSameTask(this);
// Otherwise defer to system default behavior.
super.onBackPressed();
}
To elaborate what you are doing is overriding the onbackpressed hardware button.
Also make your parent activity's launchmode singleInstance.

button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent goToBrowser = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
startActivity(goToBrowser);
finish();
}
});

Android - Fragment not attached to activity

I have an activity which loads a fragment but when I press back button on the fragment it shows the error :-
"java.lang.IllegalStateException: Fragment ProductFragment{c46ba8a} not attached to Activity"
Code is below:-
Product Fragment:
public class ProductFragment extends Fragment implements TabLayout.OnTabSelectedListener, ViewPager.OnPageChangeListener {
private static final String PRODUCT_DATA = "product_data";
private TabLayout tabLayout;
private ViewPager viewPager;
NestedScrollView nestedScrollView;
//RecyclerView listView;
//ImageView ivHeader;
ProgressDialog pd;
Bundle bundle;
ViewPager viewPager1;
private LinearLayout pager_indicator;
public String DATA = "data";
public String PRODUCTS = "products";
//public String SPRODUCTS = "sproducts";
public String ID = "id";
public String NAME = "productName";
public String IMAGEURL = "productImg1";
public String DESCRIPTION = "description";
public String PRICE = "price";
public String DELIVERYTYPE = "deliverytype";
//String url = "https://chiraggohil.000webhostapp.com/product.php";
String url = "http://www.thinkdream.in/lunchbox2/product_api/getProductList";
String sliderImageUrl = "http://www.thinkdream.in/lunchbox2/assets/images/product/2.png";
ArrayList<Product> list = new ArrayList<>();
ArrayList<Product> sliderImagesList = new ArrayList<>();
private int dotsCount = 0;
private ImageView[] dots;
private static int CURRENT_PAGE = 0;
ViewPagerSliderAdapter viewPagerSliderAdapter;
ConnectivityManager cm;
NetworkInfo activeNetwork;
boolean isConnected;
//private boolean load = false;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View v = inflater.inflate(R.layout.fragment_product, container, false);
viewPager1 = (ViewPager) v.findViewById(R.id.viewpager);
//listView = (RecyclerView) v.findViewById(R.id.gvProducts);
nestedScrollView = (NestedScrollView) v.findViewById(R.id.nestedSV);
pager_indicator = (LinearLayout) v.findViewById(R.id.viewPagerCountDots);
//nestedScrollView.setFillViewport(true);
//ivHeader = (ImageView) v.findViewById(R.id.ivHeader);
bundle = new Bundle();
tabLayout = (TabLayout) v.findViewById(R.id.tabLayout);
viewPager = (ViewPager) v.findViewById(R.id.pager);
viewPagerSliderAdapter = new ViewPagerSliderAdapter(getActivity(), sliderImagesList);
cm = (ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
activeNetwork = cm.getActiveNetworkInfo();
isConnected = activeNetwork != null && activeNetwork.isConnectedOrConnecting();
if (savedInstanceState != null) {
sliderImagesList = savedInstanceState.getParcelableArrayList(PRODUCT_DATA);
viewPager1.setAdapter(viewPagerSliderAdapter);
viewPagerSliderAdapter.notifyDataSetChanged();
} else {
if (isConnected) {
new GetUrlData(getActivity()).execute();
} else {
Toast.makeText(getActivity(), "You are not connected to the internet!", Toast.LENGTH_SHORT).show();
}
}
tabLayout.addTab(tabLayout.newTab().setText("Pizza"));
tabLayout.addTab(tabLayout.newTab().setText("Sandwich"));
tabLayout.addTab(tabLayout.newTab().setText("Burger"));
Pager adapter = new Pager(getChildFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(this);
viewPager1.addOnPageChangeListener(this);
return v;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putParcelableArrayList(PRODUCT_DATA, sliderImagesList);
}
#Override
public void onResume() {
super.onResume();
pager_indicator.removeAllViews();
//Picasso.with(getActivity()).load(sliderImageUrl).into(ivHeader);
}
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
for (int i = 0; i < dotsCount; i++) {
dots[i].setImageDrawable(getResources().getDrawable(R.drawable.nonselecteditem_dot));
}
if (position >= dotsCount) {
dots[0].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
} else {
dots[position].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
}
}
#Override
public void onPageScrollStateChanged(int state) {
}
private class GetUrlData extends AsyncTask<Void, Void, Void> {
GetUrlData(Context context) {
pd = new MyCustomProgressDialog(context, R.style.NewDialog);
}
#Override
protected void onPreExecute() {
super.onPreExecute();
pd.setCancelable(false);
pd.show();
}
#Override
protected Void doInBackground(Void... voids) {
ServiceHandler sh = new ServiceHandler();
String result = sh.Getdata(url);
//list.clear();
sliderImagesList.clear();
if (result != null) {
try {
list.clear();
JSONObject jsonObject = new JSONObject(result);
JSONArray jsonArray = jsonObject.getJSONArray(DATA);
//JSONArray jsonArray = jsonObject1.getJSONArray(PRODUCTS);
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject2 = jsonArray.getJSONObject(i);
String id = jsonObject2.getString(ID);
String name = jsonObject2.getString(NAME);
String imgpath = jsonObject2.getString(IMAGEURL);
String desc = jsonObject2.getString(DESCRIPTION);
String price = jsonObject2.getString(PRICE);
//String deliverytype = jsonObject2.getString(DELIVERYTYPE);
Product product = new Product();
product.setId(id);
product.setProductName(name);
product.setProductImage(imgpath);
product.setProductDescription(desc);
product.setProductPrice(price);
//list.add(product);
sliderImagesList.add(product);
}
} catch (Exception e) {
e.printStackTrace();
}
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
pd.dismiss();
// Picasso.with(getActivity()).load(sliderImageUrl).into(ivHeader);
if(isAdded()) {
viewPagerSliderAdapter = new ViewPagerSliderAdapter(getActivity(), sliderImagesList);
Log.e("slider",sliderImagesList.toString());
viewPager1.setAdapter(viewPagerSliderAdapter);
viewPagerSliderAdapter.notifyDataSetChanged();
slider();
setUiPageViewController();
}else {
Log.e("not added","not added");
}
}
}
private void slider() {
int NUM_PAGES = sliderImagesList.size();
final android.os.Handler handler = new android.os.Handler();
final Runnable runnable = new Runnable() {
#Override
public void run() {
CURRENT_PAGE = viewPager1.getCurrentItem();
if (CURRENT_PAGE == 2) {
CURRENT_PAGE = -1;
}
viewPager1.setCurrentItem(CURRENT_PAGE + 1, true);
}
};
Timer swipeTimer = new Timer();
swipeTimer.schedule(new TimerTask() {
#Override
public void run() {
handler.post(runnable);
}
}, 100, 4000);
}
private void setUiPageViewController() {
dotsCount = 3;
dots = new ImageView[dotsCount];
for (int i = 0; i < dotsCount; i++) {
dots[i] = new ImageView(getActivity());
dots[i].setImageDrawable(getResources().getDrawable(R.drawable.nonselecteditem_dot));
LinearLayout.LayoutParams params = new LinearLayout.LayoutParams(
LinearLayout.LayoutParams.WRAP_CONTENT,
LinearLayout.LayoutParams.WRAP_CONTENT
);
params.setMargins(4, 0, 4, 0);
pager_indicator.addView(dots[i], params);
}
dots[0].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
}
}
I don't know where I am wrong. I have searched for the error and even tried the solution from the link below:
Fragment MyFragment not attached to Activity
I ask questions on SO but I don't get response/answers. May be there is a small mistake, grammatical/formating problem, or a duplicate question but there is a possibility of my case that is different then others.
So please help and response.
Thanks.
--Edited--
HomeActivity :
public class HomeActivity extends AppCompatActivity implements View.OnClickListener {
DrawerLayout drawerLayout;
NavigationView navigationView;
Toolbar toolbar;
TextView tvActionTitle;
SessionManager sessionManager;
GPSTracker gps;
int i = 0;
private FrameLayout redCircle;
private TextView countTextView;
int cartcount = 0;
Menu menu;
LunchBoxDB lunchBoxDB;
private String uid;
SharedPreferences pref;
private int totalquantity = 0;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home);
toolbar = (Toolbar) findViewById(R.id.toolbar);
drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
navigationView = (NavigationView) findViewById(R.id.navigation);
tvActionTitle = (TextView) findViewById(R.id.tvActionTitle);
Typeface custom_font = Typeface.createFromAsset(getAssets(), "fonts/Quicksand_Bold_Oblique.otf");
tvActionTitle.setTypeface(custom_font);
setSupportActionBar(toolbar);
//getSupportActionBar().setDisplayShowTitleEnabled(false);
lunchBoxDB = new LunchBoxDB(this);
pref = getSharedPreferences("loginPref", Context.MODE_PRIVATE);
uid = pref.getString("id", null);
ProductFragment pf = new ProductFragment();
getFragmentManager().beginTransaction().replace(R.id.content_frame, pf).commit();
sessionManager = new SessionManager(this);
toolbar.setNavigationIcon(R.mipmap.ic_menu_white_24dp);
toolbar.setNavigationOnClickListener(this);
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(MenuItem item) {
Fragment frag = null;
int itemId = item.getItemId();
if (itemId == R.id.nav_home) {
drawerLayout.closeDrawers();
Intent i = new Intent(HomeActivity.this, HomeActivity.class);
startActivity(i);
HomeActivity.this.finish();
} else if (itemId == R.id.nav_profile) {
frag = new AccountFragment();
getFragmentManager().beginTransaction().replace(R.id.content_frame, frag).addToBackStack("Account").commit();
drawerLayout.closeDrawers();
} else if (itemId == R.id.nav_order) {
drawerLayout.closeDrawers();
OrdersFragment of = new OrdersFragment();
getFragmentManager().beginTransaction().replace(R.id.content_frame, of).addToBackStack("Orders").commit();
} else if (itemId == R.id.nav_store_locator) {
Intent i = new Intent(HomeActivity.this, LocationActivity.class);
startActivity(i);
drawerLayout.closeDrawers();
} else if (itemId == R.id.nav_logout) {
drawerLayout.closeDrawers();
sessionManager.logoutUser();
} else if (itemId == R.id.nav_help) {
drawerLayout.closeDrawers();
Intent i = new Intent(Intent.ACTION_DIAL);
i.setData(Uri.parse("tel:+918460765785"));
startActivity(i);
} else if (itemId == R.id.nav_corpinquiry) {
drawerLayout.closeDrawers();
CorpInquiryFragment crpf = new CorpInquiryFragment();
getFragmentManager().beginTransaction().replace(R.id.content_frame, crpf).addToBackStack("CorpInquiry").commit();
}
return false;
}
});
}
private void setNavigationDrawer() {
if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
drawerLayout.closeDrawer(GravityCompat.START);
} else {
drawerLayout.openDrawer(GravityCompat.START);
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.nav_drawer, menu);
final MenuItem alertMenuItem = menu.findItem(R.id.shopping_bag);
FrameLayout rootView = (FrameLayout) alertMenuItem.getActionView();
redCircle = (FrameLayout) rootView.findViewById(R.id.view_alert_red_circle);
countTextView = (TextView) rootView.findViewById(R.id.view_alert_count_textview);
rootView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onOptionsItemSelected(alertMenuItem);
}
});
badgeupdate();
return super.onCreateOptionsMenu(menu);
}
void badgeupdate() {
SQLiteDatabase db = lunchBoxDB.getReadableDatabase();
String query = "select sum(quantity) from cart where uid = " + uid;
Cursor c = db.rawQuery(query, null);
if (c != null && c.moveToFirst()) {
totalquantity = c.getInt(0);
}
c.close();
cartcount = totalquantity;
countTextView.setText(String.valueOf(cartcount));
redCircle.setVisibility((cartcount > 0) ? VISIBLE : GONE);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == R.id.shopping_bag) {
SharedPreferences pref = this.getSharedPreferences("couponPref", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = pref.edit();
editor.putString("discount", null);
editor.apply();
CartFragment cf = new CartFragment();
getFragmentManager().beginTransaction().replace(R.id.content_frame, cf, "CartFragment").addToBackStack(null).commit();
}
return super.onOptionsItemSelected(item);
}
#Override
public void onBackPressed() {
if (drawerLayout.isDrawerOpen(GravityCompat.START)) {
drawerLayout.closeDrawer(GravityCompat.START);
}/*else if(i==0){
Toast.makeText(this, "Press back again to exit!", Toast.LENGTH_SHORT).show();
i=1;
}*/ else {
//i=0;
super.onBackPressed();
}
}
#Override
protected void onResume() {
super.onResume();
gps = new GPSTracker(this);
}
#Override
public void onClick(View view) {
setNavigationDrawer();
}
}
Logcat error :
FATAL EXCEPTION: main
Process: com.pisac.foodrestaurant, PID: 29700
java.lang.IllegalStateException: Fragment ProductFragment{13525074} not attached to Activity
at android.app.Fragment.getResources(Fragment.java:800)
at com.pisac.foodrestaurant.ProductFragment.onPageSelected(ProductFragment.java:149)
at android.support.v4.view.ViewPager.dispatchOnPageSelected(ViewPager.java:1967)
at android.support.v4.view.ViewPager.scrollToItem(ViewPager.java:685)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:669)
at android.support.v4.view.ViewPager.setCurrentItemInternal(ViewPager.java:630)
at android.support.v4.view.ViewPager.setCurrentItem(ViewPager.java:622)
at com.pisac.foodrestaurant.ProductFragment$1.run(ProductFragment.java:244)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:135)
at android.app.ActivityThread.main(ActivityThread.java:5910)
at java.lang.reflect.Method.invoke(Native Method)
at java.lang.reflect.Method.invoke(Method.java:372)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1405)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1200)

You have problem with the line
pd.dismiss();
in onPostExecute of your GetUrlData. Put it inside if (isAdded ()) As per the answer of the question you reffered in your question. Your dialog uses the context of the activity.
EDIT
Add an if block in onPageSelected method that checks if Fragment if attached i.e.
#Override
public void onPageSelected(int position) {
if(!isAdded ())
return;
for (int i = 0; i < dotsCount; i++) {
dots[i].setImageDrawable(getResources().getDrawable(R.drawable.nonselecteditem_dot));
}
if (position >= dotsCount) {
dots[0].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
} else {
dots[position].setImageDrawable(getResources().getDrawable(R.drawable.selecteditem_dot));
}
}

Thanks for helping me.
I got the answer.
I added onStop in the ProductFragment code as below :
#Override
public void onStop() {
viewPager1.setAdapter(null);
super.onStop();
}
and update the onResume :
#Override
public void onResume() {
super.onResume();
pager_indicator.removeAllViews();
if(viewPagerSliderAdapter==null){
new GetUrlData(getActivity()).execute();
}
}
Thanks once again.

when press back button activity does not finish

My app contains two activities and First activity load data from web using volley and after successful loading of data start second activity, the second activity contains dynamic tabs and view pager. My issues is when i press back button from second activity does not finish the activity but restart second activity again and it will finish when press ten times of back button that is my tabs count is 10, any one can help me to solve this issue..
First Actvity, SplashActivity.java
public class SplashActivity extends AppCompatActivity {
private static final String HOME_URL = "http://sampleurl.com/beta/Mobile_controller";
public static ArrayList<CategoryModel> categories;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
getCategories();
}
private void getCategories() {
categories = new ArrayList<>();
StringRequest request = new StringRequest(Request.Method.POST, HOME_URL, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject object = new JSONObject(response);
JSONArray categoryJsonArray = object.getJSONArray("category");
for (int i = 0; i < categoryJsonArray.length(); i++) {
CategoryModel model = new CategoryModel();
JSONObject cat = categoryJsonArray.getJSONObject(i);
model.setCategoryID(cat.getString("category_id"));
model.setCategoryName(cat.getString("category_name"));
categories.add(model);
startActivity(new Intent(getApplicationContext(), MainActivity.class));
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getApplicationContext(), String.valueOf("error : " + error.getMessage()),Toast.LENGTH_SHORT).show();
}
});
RequestQueue queue = Volley.newRequestQueue(SplashActivity.this);
queue.add(request);
}
}
Second Activity MainActivity.java
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
MediaController mediaController;
private ArrayList<CategoryModel> categoryList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.tb_home);
setSupportActionBar(toolbar);
categoryList = SplashActivity.categories;
NavigationView navDrawer = (NavigationView) findViewById(R.id.navigation_home);
navDrawer.setNavigationItemSelectedListener(this);
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout_home);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(this, drawer, toolbar, R.string.app_name, R.string.app_name);
drawer.setDrawerListener(toggle);
toggle.syncState();
TabLayout tabLayout = (TabLayout) findViewById(R.id.tbl_home);
for (int i = 0; i < categoryList.size(); i++) {
tabLayout.addTab(tabLayout.newTab().setText(categoryList.get(i).getCategoryName()));
}
final ViewPager viewPager = (ViewPager) findViewById(R.id.vp_home_content);
SwipingTabsAdapter swipingTabsAdapter = new SwipingTabsAdapter(getSupportFragmentManager(), categoryList, tabLayout.getTabCount());
viewPager.setAdapter(swipingTabsAdapter);
viewPager.setOffscreenPageLimit(3);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_option_home, menu);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchView searchView = (SearchView) menu.findItem(R.id.menu_option_search).getActionView();
if (searchView != null) {
searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
Toast.makeText(getApplicationContext(), newText, Toast.LENGTH_SHORT).show();
return true;
}
});
}
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_option_account:
Toast.makeText(getApplicationContext(), "account", Toast.LENGTH_SHORT).show();
break;
}
return true;
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
return false;
}
}
View pager Adapter
public class SwipingTabsAdapter extends FragmentStatePagerAdapter {
private int tabs;
private ArrayList<CategoryModel> categoryList;
public SwipingTabsAdapter(FragmentManager fm, ArrayList<CategoryModel> categories, int tabCounts) {
super(fm);
this.categoryList = categories;
this.tabs = tabCounts;
}
#Override
public Fragment getItem(int position) {
/*switch (position) {
case 0:
return new NewsCategoriesFragment();
case 1:
return new NewsCategoriesFragment();
default:
return new NewsCategoriesFragment();
}*/
return NewsCategoriesFragment.newInstance(Integer.parseInt(categoryList.get(position).getCategoryID()));
}
#Override
public int getCount() {
return tabs;
}
}
My fragment
public class NewsCategoriesFragment extends Fragment {
private ArrayList<SliderModel> sliderNews;
private SliderNewsAdapter sliderNewsAdapter;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_new_categories, container, false);
Button button = (Button) view.findViewById(R.id.button);
Bundle bundle = getArguments();
int id = bundle.getInt("id");
getNews(id);
ViewPager viewPager = (ViewPager) view.findViewById(R.id.vp_slider_news);
sliderNewsAdapter = new SliderNewsAdapter(getContext(), sliderNews);
viewPager.setAdapter(sliderNewsAdapter);
button.setText(String.valueOf(id));
return view;
}
public static Fragment newInstance(int id) {
NewsCategoriesFragment fragment = new NewsCategoriesFragment();
Bundle bundle = new Bundle();
bundle.putInt("id", id);
fragment.setArguments(bundle);
return fragment;
}
private void getNews(final int categoryId) {
sliderNews = new ArrayList<>();
StringRequest request = new StringRequest(Request.Method.POST, NEWS_URL, new Response.Listener<String>() {
#Override
public void onResponse(String response) {
try {
JSONObject object = new JSONObject(response);
JSONArray sliderNewsJsonArray = object.getJSONArray("slider_news");
for (int i = 0; i < sliderNewsJsonArray.length(); i++) {
SliderModel model = new SliderModel();
JSONObject data = sliderNewsJsonArray.getJSONObject(i);
model.setNewsThumbImg(data.getString("news_thump_image"));
sliderNews.add(model);
}
sliderNewsAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
Toast.makeText(getContext(), "JSON Exception", Toast.LENGTH_SHORT).show();
}
}
}, new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
Toast.makeText(getContext(), String.valueOf("error "+ error.getMessage()), Toast.LENGTH_SHORT).show();
}
}){
#Override
protected Map<String, String> getParams() throws AuthFailureError {
Map<String, String> data = new HashMap<>();
data.put("id", String.valueOf(categoryId));
return data;
}
};
RequestQueue queue = Volley.newRequestQueue(getContext());
queue.add(request);
}
}

Problem is you put your startActivity inside the for loop, put start activity after for loop in Splashactiivty getCategories, it will work fine
Change this,
try {
JSONObject object = new JSONObject(response);
JSONArray categoryJsonArray = object.getJSONArray("category");
for (int i = 0; i < categoryJsonArray.length(); i++) {
CategoryModel model = new CategoryModel();
JSONObject cat = categoryJsonArray.getJSONObject(i);
model.setCategoryID(cat.getString("category_id"));
model.setCategoryName(cat.getString("category_name"));
categories.add(model);
startActivity(new Intent(getApplicationContext(), MainActivity.class));
}
} catch (JSONException e) {
e.printStackTrace();
}
to
try {
JSONObject object = new JSONObject(response);
JSONArray categoryJsonArray = object.getJSONArray("category");
for (int i = 0; i < categoryJsonArray.length(); i++) {
CategoryModel model = new CategoryModel();
JSONObject cat = categoryJsonArray.getJSONObject(i);
model.setCategoryID(cat.getString("category_id"));
model.setCategoryName(cat.getString("category_name"));
categories.add(model);
}
startActivity(new Intent(getApplicationContext(), MainActivity.class));
} catch (JSONException e) {
e.printStackTrace();
}

in second activity override as
#Override
public void onBackPressed() {
finish();
}

You don't really need to Launch a intent to previous activity. Android has something called Back Stack which contains previous launched activities in a stack data structure.You could have just overridden onBackPressed() method to get it done.
#Override
public void onBackPressed(){
this.finish();
}
Also note launching intent as NewTask helps you to get away from existing backstack and has its own backstack.