I work on an app which contains Fragments and a ViewPager. I fetch location data in my MainActivity and want to use it inside the fragments, so I created a method to pass the variables and process with them. Unfortunately I get a NullPointerException on all view objects, like the progressBar or the CollapsingToolbarLayout inside of the Fragment when the method is called. I guess the fragment is not correctly started just by calling a method, but how can I change it, so the view objects are created? Or is there another way to first fetch location data and use it inside the fragments afterwards?
My MainActivity:
public class MainActivity extends AppCompatActivity implements Serializable {
private ViewPager viewPager;
BottomNavigationView bottomNavigationView;
FragmentA FragmentA;
FragmentB FragmentB;
FragmentC FragmentC;
MenuItem prevMenuItem;
public double lat;
public double lon;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewpager);
bottomNavigationView = (BottomNavigationView)findViewById(R.id.bottom_navigation);
bottomNavigationView.setOnNavigationItemSelectedListener(
new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.navigation_umkreis:
viewPager.setCurrentItem(0);
break;
case R.id.navigation_karte:
viewPager.setCurrentItem(1);
break;
case R.id.navigation_einstellungen:
viewPager.setCurrentItem(2);
break;
}
return false;
}
});
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
if (prevMenuItem != null) {
prevMenuItem.setChecked(false);
}
else
{
bottomNavigationView.getMenu().getItem(0).setChecked(false);
}
Log.d("page", "onPageSelected: "+position);
bottomNavigationView.getMenu().getItem(position).setChecked(true);
prevMenuItem = bottomNavigationView.getMenu().getItem(position);
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
setupViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
callsFragment = new CallsFragment();
chatFragment = new ChatFragment();
contactsFragment = new ContactsFragment();
adapter.addFragment(callsFragment);
adapter.addFragment(chatFragment);
adapter.addFragment(contactsFragment);
viewPager.setAdapter(adapter);
int limit = adapter.getCount();
viewPager.setOffscreenPageLimit(limit);
}
public void start() {
//Location data fetched here
FragmentB fb = new FragmentB();
fb.start(lat, lon);
}
}
My FragmentB:
public class FragmentB extends Fragment {
private ProgressBar progressBar;
private double lat;
private double lon;
String title;
private BaseAdapter mItemsAdapter;
private final List<HashMap<String, String>> mItemList = new ArrayList<>();
ArrayList<HashMap<String, String>> resultList = new ArrayList<>();
public FragmentB() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_b, container, false);
progressBar = (ProgressBar) view.findViewById(R.id.progressBar);
progressBar.setVisibility(View.VISIBLE);
((ListView) view.findViewById(R.id.list))
.setAdapter(mItemsAdapter);
return view;
}
public void start(double latGet, double lonGet){
lat = latGet;
lon = lonGet;
new GetContacts().execute();
}
private class GetContacts extends AsyncTask<Void, Void, Void>{
#Override
protected void onPreExecute() {
super.onPreExecute();
// Showing progress dialog
}
#Override
protected Void doInBackground(Void... arg0) {
//Fetch And Process Data -> Result into resultList
}
#Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
// Dismiss the progress dialog
final CollapsingToolbarLayout collapsingToolbarLayout = (CollapsingToolbarLayout) getActivity().findViewById(R.id.toolbar_layout);
AppBarLayout appBarLayout = (AppBarLayout) getActivity().findViewById(R.id.appBar);
progressBar.setVisibility(View.GONE);
//Updating parsed JSON data into ListView
mItemsAdapter = new SimpleAdapter(
getActivity(), mItemList,
R.layout.list_item, new String[]{"brand", "price",
"dist", "street", "houseNumber", "postcode", "place"}, new int[]{R.id.brand,
R.id.price, R.id.dist, R.id.street, R.id.houseNumber, R.id.postCode, R.id.place});
mItemList.addAll(resultList);
mItemsAdapter.notifyDataSetChanged();
}
}
}
In the following method from MainActivity, you try to pass the location data to an instance of FragmentB:
public void start() {
//Location data fetched here
FragmentB fb = new FragmentB();
fb.start(lat, lon);
}
The resulting crash is due to the fact that you only instantiate the Fragment, nothing else. Methods like onCreateView() or onAttach() will only be called if the Fragment is (about to be) added to the View hierarchy. So for this instance of FragmentB, methods like getContext() or getActivity() will return null. That's why you get NullPointerExceptions.
Make sure that you only call start() on a Fragment which has been added to the View hierarchy. Or modify the method so that it stores the location data in some appropriate structure which can be accessed from e.g. onViewCreated(), onStart() or onResume()
See the docs for more information on the Fragment lifecycle
Related
Don't know how to send the arraylist that's been filled in the onDataChanged to the method that's called to create a new fragment to pass it with a bundle object
i've tried messing with the constructor to expect it as a parameter and in the constructor's body appears as "not empty" but after that i don't know how to send it to the addFragment method since i've tried and seems "null".
i've tried to access to it as MainActivity.this.arraylist but it says is empty.
i've made it static and it still says it's empty
public class MainActivity extends AppCompatActivity {
private TabLayout tablayout;
private ViewPager viewpager;
private Temperatura temperatura;
private Humedad humedad;
private Viento viento;
private Info informacion;
List<String> Lecturabundle = new ArrayList<>();
DatabaseReference mDatabase;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mDatabase = FirebaseDatabase.getInstance().getReference();
tablayout = findViewById(R.id.tablayout);
viewpager = findViewById(R.id.viewpager);
temperatura = new Temperatura();
humedad = new Humedad();
viento = new Viento();
informacion = new Info();
tablayout.setupWithViewPager(viewpager);
ViewPagerAdapter viewpageradapter = new ViewPagerAdapter(getSupportFragmentManager(), 0);
mDatabase.child("lectura").child("hora").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
Lecturabundle.add(dataSnapshot.getValue().toString());
}
#Override
public void onCancelled(#NonNull DatabaseError databaseError) {
System.out.println("The read failed: " + databaseError.getCode());
}
});
viewpageradapter.addFragment(temperatura, "Temperatura");
viewpageradapter.addFragment(humedad, "Humedad");
viewpageradapter.addFragment(viento, "Viento");
viewpageradapter.addFragment(informacion, "info");
viewpager.setAdapter(viewpageradapter);
}
private class ViewPagerAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments = new ArrayList<>();
private List<String> fragmentTitle = new ArrayList<>();
public ViewPagerAdapter(#NonNull FragmentManager fm, int behavior) {
super(fm, behavior);
}
#NonNull
#Override
public Fragment getItem(int position) {
return fragments.get(position);
}
public void addFragment(Fragment fragment, String title, List<String> recibeArrayList){
HERE'S WHERE I NEED LECTURABUNDLE TO BE SO I CAN SEND IT TO EACH FRAGMENT BUT I DON'T KNOW HOW TO DO IT THE RIGHT WAY SINCE WHAT I'VE TRIED GETS ME TO A POINT WHERE WHEN IT'S FINALLY HERE ISEMPTY() SAYS TRU
Bundle b = new Bundle();
b.putStringArrayList("recibe", (ArrayList<String>) Lecturabundle);
fragment.setArguments(b);
fragments.add(fragment);
fragmentTitle.add(title);
}
#Override
public int getCount() {
return fragments.size();
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return fragmentTitle.get(position);
}
}
}
i need Lecturabundle to be in the addFragment so i can pass it as a bundle to the fragments
The right way is using Bundle to pass it to your fragment.
But in your case, you are creating/initializing fragment in onCreate and the onDataChanged method gets called after some time you can say it may take a couple of seconds to minutes to get called depending on Data.
So if you want to send that data to your fragment what you can do is you can create a public method in your fragment class let's say name it as newDataInserted(list) with list as parameter. now you can call that method inside onDataChanged() using your fragment instance you created earlier.
For example
public void onDataChange(#NonNull DataSnapshot dataSnapshot) {
Lecturabundle.add(dataSnapshot.getValue().toString());
if(temperature != null) {
temperatura.newDataInserted(Lecturabundle);
}
}
I have created a bottomNavigation bar which consists of 5 Fragments, so once each tab is clicked it will switch from one fragment to another.
The question is:The second fragment (Search fragment) have 1 TextView with setOnClickListener so once it is been licked a layout activity will open on the top which includes a ListView to allow the user to select/click on a specific Item, so later on this selected item info should be displayed on that TextView within the(Search fragment).
The issue is that this Textview won't be updated, unless I call the mainActivity to so all fragments in bottom Navigation bar will be updated
My question is how I can refresh that specific fragment without calling the MainActivity.
public class MainActivity extends AppCompatActivity {
final Fragment f1 = new HomeFragment();
final Fragment f2 = new SearchFragment();
final Fragment f3 = new CameraFragment();
final Fragment f4 = new ChatFragment();
final Fragment f6 = new LogginFragment();
final FragmentManager fm = getSupportFragmentManager();
Fragment active = f1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
BottomNavigationViewEx bnve = (BottomNavigationViewEx) findViewById(R.id.bottom_navigation);
bnve.enableAnimation(false);
bnve.enableShiftingMode(false);
bnve.enableItemShiftingMode(false);
bnve.setOnNavigationItemSelectedListener(navListener);
if(SharePrefManager.getInstance(this).isLoggedin()){
finish();
startActivity(new Intent(this, SuccessActivity.class));
return;
}
fm.beginTransaction().add(R.id.fragment_container, f6, "6").hide(f6).commit();
//fm.beginTransaction().add(R.id.fragment_container, f5, "5").hide(f5).commit();
fm.beginTransaction().add(R.id.fragment_container, f4, "4").hide(f4).commit();
fm.beginTransaction().add(R.id.fragment_container, f3, "3").hide(f3).commit();
fm.beginTransaction().add(R.id.fragment_container, f2, "2").hide(f2).commit();
fm.beginTransaction().add(R.id.fragment_container, f1, "1").commit();
}
public BottomNavigationViewEx.OnNavigationItemSelectedListener navListener =
new BottomNavigationViewEx.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
switch (item.getItemId()) {
case R.id.nav_home:
fm.beginTransaction().hide(active).show(f1).commit();
active = f1;
return true;
case R.id.nav_search:
fm.beginTransaction().hide(active).show(f2).commit();
active = f2;
return true;
case R.id.nav_camera:
fm.beginTransaction().hide(active).show(f3).commit();
active = f3;
return true;
case R.id.nav_chat:
fm.beginTransaction().hide(active).show(f4).commit();
active = f4;
return true;
case R.id.nav_account:
fm.beginTransaction().hide(active).show(f6).commit();
active = f6;
return true;
}
return false;
}
};
}
------------------------SearchFragment Class----------------------------------
This is the search fragment which has the textView (Categories) which supposed to be updated/be refershed without calling the MainActivity
public class SearchFragment extends Fragment {
private Context mContext;
TextView Categories;
static boolean status = false;
String SelectedItem;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_search,container,false);
Categories = (TextView) v.findViewById(R.id.categories);
SelectedItem = DataHolder.getInstance().getItem();
Categories.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(mContext, AllCateActivity.class));
}
});
if(status){Categories.setText(SelectedItem);}
return v;
}
public void ChangeStatus(Boolean status){
this.status = status;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
mContext=context;
}
}
--------------------------DataHolder Class---------------------------------
This works as a design pattern to share arguments between the search fragment and Categories_Activity
public class DataHolder {
private static DataHolder dataHolder = null;
private DataHolder() {
}
public static DataHolder getInstance() {
if (dataHolder == null)
{
dataHolder = new DataHolder();
}
return dataHolder;
}
private String item;
public String getItem() {
return item;
}
public void setItem(String item) {
this.item = item;
}
}
--------------------------Categories_Activity---------------------------------
This Activity once it's being called a listview will show allowing user to select an item. So once an Item has been selected it will start the MainActivity in order to refresh the Text field in the search Fragment
public class Categories_Activity extends AppCompatActivity implements View.OnClickListener {
ImageView BacktoMainCate;
ListView subCate;
public String selectedItem;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.tab_subcategory);
subCate = (ListView)findViewById(R.id.listview_subcate);
BacktoMainCate = (ImageView)findViewById(R.id.BacktoMainCate);
BacktoMainCate.setOnClickListener(this);
final SearchFragment SF = new SearchFragment();
subCate.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
selectedItem = String.valueOf(parent.getItemAtPosition(position));
DataHolder.getInstance().setItem(selectedItem);
SF.ChangeStatus(true);
Intent in = new Intent(Categories_Activity.this,SuccessActivity.class);
startActivity(in);
});
}
#Override
public void onClick(View v) {
if (v == BacktoMainCate){
//startActivity(new Intent(this,AllCateActivity.class));
finish();
}
}
}
I have used SharedPreferences on both Fragment/Activity life cycle.
So once the Categories_Activity get started, Main Activity will go in onPause and with it all its Fragments will be put in onPause. When user clicks on one of the ListView items in the Categories_Activity, data of that selected item will be store inside SharedPreferences like:
PreferenceManager.getDefaultSharedPreferences(Categories_Activity .this)
.edit().putString(key, selectedItemInfo).apply();
Then override onResume() method inside MainActivity and SearchFragment:
#Override
public void onResume() {
super.onResume();
String value = PreferenceManager.getDefaultSharedPreferences(getContext())
.getString(key, "");
if (value != null && !value.isEmpty()) {
Categories.setText(value);
PreferenceManager.getDefaultSharedPreferences(getContext()).edit().remove(key);
}
}
I am New to Android. I Have Created Tab using android.support.v4.view.ViewPager. When i trying to get data from server using Json Request it give me the Error
AccountActivity is not an enclosing class.
please Any Help will be Appreciated
TAb1.java
public class Tab1 extends Fragment {
private ProgressDialog pDialog;
private UserAddress userAddress;
private TextView txtResponsec;
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
new LoadUserAddress().execute();
}
class LoadUserAddress extends AsyncTask<String,String,String> {
private ProgressDialog progressDialog;
#Override
protected String doInBackground(String... params) {
try {
List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
JSONHttpClient jsonHttpClient = new JSONHttpClient();
userAddress = jsonHttpClient.Get(ServiceUrl.UserAddress, nameValuePairs, UserAddress.class);
String id = userAddress.GetId();
}
catch (Exception ex){
String message = ex.getMessage();
}
return null;
}
#Override
protected void onPreExecute() {
super.onPreExecute(); //To change body of overridden methods use File | Settings | File Templates.
progressDialog = new ProgressDialog(AccountActivity.this);
progressDialog.setMessage("Loading products. Please wait...");
progressDialog.show();
}
#Override
protected void onPostExecute(String s) {
progressDialog.dismiss();
getActivity().runOnUiThread(new Runnable() {
#Override
public void run() {
txtResponsec.setText(userAddress.GetCountry());
}
});
}
}
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1,container,false);
return v;
}
}
AccountActivity.java
public class AccountActivity extends AppCompatActivity {
Toolbar toolbar;
ActionBar actionBar;
ViewPager pager;
ViewPagerAdapter adapter;
SlidingTabLayout tabs;
CharSequence Titles[]={"Info.","Address","Contact","Email"};
int Numboftabs =4;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_account);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
assert getSupportActionBar() != null;
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
if (toolbar != null) {
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
onBackPressed();
}
});
}
adapter = new ViewPagerAdapter(getSupportFragmentManager(),Titles,Numboftabs);
// Assigning ViewPager View and setting the adapter
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
// Assiging the Sliding Tab Layout View
tabs = (SlidingTabLayout) findViewById(R.id.tabs);
tabs.setDistributeEvenly(true); // To make the Tabs Fixed set this true, This makes the tabs Space Evenly in Available width
// Setting Custom Color for the Scroll bar indicator of the Tab View
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.tabsScrollColor);
}
});
// Setting the ViewPager For the SlidingTabsLayout
tabs.setViewPager(pager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_account, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
You should change
progressDialog = new ProgressDialog(AccountActivity.this);
to
progressDialog = new ProgressDialog(getActivity());
in Tab1 Fragment also i see txtResponsec=null you forget to initialized it.
Edit:
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View v =inflater.inflate(R.layout.tab_1,container,false);
txtResponsec=(TextView)v.findViewById(R.id.txtResponsecId);
return v;
}
I'm trying to implement the back press feature for a fragment and activity regarding the navigation drawer but it's not working. Does anyone know what I'm doing wrong / what is missing and what needs to be done in order to fix this?
activity class
public class BakerlooHDNActivity extends AppCompatActivity {
//save our header or result
private Drawer result = null;
// Declaring Views and Variables
ViewPager pager;
BakerlooHDNViewPagerAdapter adapter;
BakerlooHDNSlidingTabLayout bakerloohdntabs;
int Numboftabs = 2;
private int getFactorColor(int color, float factor) {
float[] hsv = new float[3];
Color.colorToHSV(color, hsv);
hsv[2] *= factor;
color = Color.HSVToColor(hsv);
return color;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bakerloo_hdn);
final String actionBarColor = "#B36305";
Toolbar mToolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(mToolbar);
if(getSupportActionBar()!=null) {
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(false);
getSupportActionBar().setTitle(Html.fromHtml("<font color='#FFFFFF'>" + getResources().getString(R.string.hdn) + "</font>"));
getSupportActionBar().setSubtitle(Html.fromHtml("<font color='#FFFFFF'>" + getResources().getString(R.string.zone_3) + "</font>"));
final Drawable upArrow = ContextCompat.getDrawable(this, R.drawable.abc_ic_ab_back_mtrl_am_alpha);
upArrow.setColorFilter(getResources().getColor(R.color.white), PorterDuff.Mode.SRC_ATOP);
getSupportActionBar().setHomeAsUpIndicator(upArrow);
}
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
Window window = getWindow();
window.addFlags(WindowManager.LayoutParams.FLAG_DRAWS_SYSTEM_BAR_BACKGROUNDS);
getWindow().setStatusBarColor(getFactorColor(Color.parseColor(actionBarColor), 0.8f));
}
// start of navigation drawer
headerResult = new AccountHeaderBuilder()
.withActivity(getActivity())
.withCompactStyle(true)
.withHeaderBackground(R.color.bakerloo)
.withProfileImagesVisible(false)
.withTextColor(Color.parseColor("#FFFFFF"))
.withSelectionListEnabled(false)
.addProfiles(
new ProfileDrawerItem().withName(getString(R.string.hdn)).withEmail(getString(R.string.hello_world))
)
.build();
result = new DrawerBuilder()
.withActivity(getActivity())
.withAccountHeader(headerResult)
.withTranslucentStatusBar(false)
.withActionBarDrawerToggle(false)
.withSelectedItem(-1)
.addDrawerItems(
new PrimaryDrawerItem().withName(R.string.hello_world).withIdentifier(1).withCheckable(false)
)
.build();
// end of navigation drawer
}
#Override
public void onBackPressed() {
if (result.isDrawerOpen()) {
result.closeDrawer();
} else {
super.onBackPressed();
}
LocalBroadcastManager.getInstance(getApplicationContext()).sendBroadcast(new Intent("BACKPRESSED_TAG"));
}
}
fragment class
public class FragmentBakerlooHDN extends android.support.v4.app.Fragment {
public FragmentBakerlooHDN() {
// Required empty constructor
}
BroadcastReceiver onNotice = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// do stuff when back in activity is pressed
result.closeDrawer();
}
};
// Declaring navigation drawer
private AccountHeader headerResult = null;
private Drawer result = null;
/**
* Whether or not the activity is in two-pane mode, i.e. running on a tablet
* device.
*/
private boolean mTwoPane;
#Override
public void onCreate(Bundle savedInstanceState) {
LocalBroadcastManager.getInstance(getActivity()).registerReceiver(onNotice, new IntentFilter("BACKPRESSED_TAG"));
super.onCreate(savedInstanceState);
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_bakerloo_hdn, container, false);
// start of navigation drawer
headerResult = new AccountHeaderBuilder()
.withActivity(getActivity())
.withCompactStyle(true)
.withHeaderBackground(R.color.bakerloo)
.withProfileImagesVisible(false)
.withTextColor(Color.parseColor("#FFFFFF"))
.withSelectionListEnabled(false)
.addProfiles(
new ProfileDrawerItem().withName(getString(R.string.hdn)).withEmail(getString(R.string.hello_world))
)
.build();
result = new DrawerBuilder()
.withActivity(getActivity())
.withAccountHeader(headerResult)
.withTranslucentStatusBar(false)
.withActionBarDrawerToggle(false)
.withSelectedItem(-1)
.addDrawerItems(
new PrimaryDrawerItem().withName(R.string.hello_world).withIdentifier(1).withCheckable(false)
)
.build();
// end of navigation drawer
super.onCreate(savedInstanceState);
return v;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
View v = getView();
super.onActivityCreated(savedInstanceState);
}
}
try this:
private DrawerLayout mDrawerLayout;
private ListView mDrawerList;
#Override
public void onCreate() {
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
mDrawerList = (ListView) findViewById(R.id.navdrawer);
}
#Override
public void onBackPressed() {
if(mDrawerLayout.isDrawerOpen(mDrawerList)) mDrawerLayout.closeDrawer(mDrawerList);
else super.onBackPressed();
}
EDIT:
You can use LocalBroadcastManager to update fragment when in activity back is pressed:
in fragment add new BroadcastReceiver() Instance:
BroadcastReceiver onNotice = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
// do stuff when back in activity is pressed
// headerResult.closeDrawer();
}
};
and register it with tag in onCreate method:
LocalBroadcastManager.getInstance(this).registerReceiver(onNotice,
new IntentFilter("BACKPRESSED_TAG"));
Then, in Activity OnBackPressed method call broadcast:
LocalBroadcastManager.getInstance(context).sendBroadcast(new Intent("BACKPRESSED_TAG"));
Do you have a reference inside your code to the interface? Looks like you're calling that interface directly hence the errors. Try renaming that method too. It might be conflicting with the super class's onBackPressed method.
Your problem is that your interface is named exactly as the property you are trying to use.
Rename it and use a instance.
#Override
public void onBackPressed() {
OnBackPressedListener instance = getSettedListener();
if (result.isDrawerOpen()) {
result.closeDrawer();
} else {
return instance.onBackPressed();
}
}
public interface OnBackPressedListener {
boolean onBackPressed();
}
This code would compile if you also implement the method getSettedListener on your code (that could be like the following):
public OnBackPressedListener getSettedListener() {
return new OnBackPressedListener(){
boolean onBackPressed(){
if(shouldConsumeBack)
return consumeBack();
else return false;
};
}
}
But this code could return the Fragment that does implements the method.
Hi i know question like this asked before several times but i couldn't find a way to fix my problem.
What i want to do: i want to add items to listview from my mainactivity in swiping page project.
My mainactivity
public class MainActivity extends SherlockFragmentActivity {
// Declare Variables
ActionBar mActionBar;
ViewPager mPager;
Tab tab;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Get the view from activity_main.xml
setContentView(R.layout.activity_main);
final Context context = getApplicationContext();
for (int s = 0; s < 10; s++) {
Swap.stafu1.add("F" + s);
Swap.stafu2.add("F" + s);
}
// Activate Navigation Mode Tabs
mActionBar = getSupportActionBar();
mActionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
// Locate ViewPager in activity_main.xml
mPager = (ViewPager) findViewById(R.id.pager);
// Activate Fragment Manager
FragmentManager fm = getSupportFragmentManager();
// Capture ViewPager page swipes
ViewPager.SimpleOnPageChangeListener ViewPagerListener = new ViewPager.SimpleOnPageChangeListener() {
#Override
public void onPageSelected(int position) {
super.onPageSelected(position);
// Find the ViewPager Position
mActionBar.setSelectedNavigationItem(position);
if (position == 1) {
Button b = (Button) findViewById(R.id.button1);
b.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View arg0) {
Log.d("bingo", "clicked" + Swap.stafu1.size());
Swap.stafu1.add("sometext");
Swap.stafu2.add("sometext");
Swap.stafu1.remove(0);
Swap.stafu2.remove(0);
FragmentTab2 f2 = new FragmentTab2();
f2.nDChanged();
}
});
}
}
};
mPager.setOnPageChangeListener(ViewPagerListener);
// Locate the adapter class called ViewPagerAdapter.java
ViewPagerAdapter viewpageradapter = new ViewPagerAdapter(fm);
// Set the View Pager Adapter into ViewPager
mPager.setAdapter(viewpageradapter);
// Capture tab button clicks
ActionBar.TabListener tabListener = new ActionBar.TabListener() {
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
// Pass the position on tab click to ViewPager
mPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
};
// Create first Tab
tab = mActionBar.newTab().setText("Tab1").setTabListener(tabListener);
mActionBar.addTab(tab);
// Create second Tab
tab = mActionBar.newTab().setText("Tab2").setTabListener(tabListener);
mActionBar.addTab(tab);
// Create third Tab
tab = mActionBar.newTab().setText("Tab3").setTabListener(tabListener);
mActionBar.addTab(tab);
}
}
FragmentTab2.java
public class FragmentTab2 extends SherlockFragment {
ListView list;
ListViewAdapter adapter;
#Override
public SherlockFragmentActivity getSherlockActivity() {
return super.getSherlockActivity();
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragmenttab2, container,
false);
// Locate the ListView in fragmenttab1.xml
list = (ListView) rootView.findViewById(R.id.listview);
// Pass results to ListViewAdapter Class
adapter = new ListViewAdapter(getActivity(), Swap.stafu1, Swap.stafu2);
// Binds the Adapter to the ListView
list.setAdapter(adapter);
return rootView;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
setUserVisibleHint(true);
}
public void nDChanged() {
Log.d("bingo", "clicked"+Swap.stafu1.size());
adapter = new ListViewAdapter(getActivity(), Swap.stafu1, Swap.stafu2);
adapter.notifyDataSetChanged();
}
}
Swap.java
public class Swap {
public static ArrayList<String> stafu1=new ArrayList<String>();
public static ArrayList<String> stafu2=new ArrayList<String>();
}
problem: notifyDataSetChanged() dosn't work until i remove one item from listview and that's mean i cant increasing item in listview.
When i don't use notifyDataSetChanged() i can add text to Swap.stafu1 and Swap.stafu1 and that's appear in listview when i swipe page and swipe page back to fragmenttab2.
I guess i need to refresh listview or fragmenttab2 every time i add items on listview. but I don't know how can i do that.
Thanks for any help.
You need emplacement this notifyDataSetChanged() and registerDataSetObserver() method in your listview adapter.
private ArrayList<DataSetObserver> observers = new ArrayList<DataSetObserver>();
public void registerDataSetObserver(DataSetObserver observer) {
observers.add(observer);
}
public void notifyDataSetChanged(){
for (DataSetObserver observer: observers) {
observer.onChanged();
}
}