Develop Reference

Using SearchView to retrieve matching values in Firebase database

I have an activity where I want to search matching values in my firebase database. I don't want anything to appear up until something is typed on my SearchBar, after something has been typed I want to display values that match what was typed in my SearchBar. I have created an activity and it is not displaying anything up until you type something, my problem is that it does not retrieve the matching values but it shows everything within my database directory.
This is my activity:
public class MyUsersActivity extends AppCompatActivit {
private Toolbar toolbar, searchtollbar;
private RecyclerView mUsersList;
private DatabaseReference mUsersDatabase;
private LinearLayoutManager mLayoutManager;
Menu search_menu;
MenuItem item_search;
#Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//getSupportActionBar().setTitle("Search Users");
//toolbar.setTitleTextColor(android.graphics.Color.WHITE);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mUsersDatabase = FirebaseDatabase.getInstance().getReference().child("Users");
mLayoutManager = new LinearLayoutManager(this);
mUsersList = (RecyclerView) findViewById(R.id.users_list);
mUsersList.setHasFixedSize(true);
mUsersList.setLayoutManager(mLayoutManager);
setSearchtollbar();
}
#Override
protected void onStart() {
super.onStart();
}
public static class UsersViewHolder extends RecyclerView.ViewHolder {
View mView;
public UsersViewHolder(View itemView) {
super(itemView);
mView = itemView;
}
public void setDisplayName(String name){
TextView userNameView = (TextView) mView.findViewById(R.id.user_single_name);
userNameView.setText(name);
}
public void setUserStatus(String status){
TextView userStatusView = (TextView) mView.findViewById(R.id.user_single_status);
userStatusView.setText(status);
}
public void setUserImage(String thumb_image, Context ctx){
CircleImageView userImageView = (CircleImageView) mView.findViewById(R.id.user_single_image);
Picasso.with(ctx).load(thumb_image).placeholder(R.drawable.my_profile).into(userImageView);
}
}
public void setSearchtollbar()
{
searchtollbar = (Toolbar) findViewById(R.id.searchtoolbar);
if (searchtollbar != null) {
searchtollbar.inflateMenu(R.menu.menu_search);
search_menu=searchtollbar.getMenu();
searchtollbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
circleReveal(R.id.searchtoolbar,1,true,false);
else
searchtollbar.setVisibility(View.GONE);
}
});
item_search = search_menu.findItem(R.id.action_filter_search);
MenuItemCompat.setOnActionExpandListener(item_search, new MenuItemCompat.OnActionExpandListener() {
#Override
public boolean onMenuItemActionCollapse(MenuItem item) {
// Do something when collapsed
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
circleReveal(R.id.searchtoolbar,1,true,false);
}
else
searchtollbar.setVisibility(View.GONE);
return true;
}
#Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Do something when expanded
return true;
}
});
initSearchView();
} else
Log.d("toolbar", "setSearchtollbar: NULL");
}
#RequiresApi(api = Build.VERSION_CODES.LOLLIPOP)
public void circleReveal(int viewID, int posFromRight, boolean containsOverflow, final boolean isShow)
{
final View myView = findViewById(viewID);
int width=myView.getWidth();
if(posFromRight>0)
width-=(posFromRight*getResources().getDimensionPixelSize(R.dimen.abc_action_button_min_width_material))-(getResources().getDimensionPixelSize(R.dimen.abc_action_button_min_width_material)/ 2);
if(containsOverflow)
width-=getResources().getDimensionPixelSize(R.dimen.abc_action_button_min_width_overflow_material);
int cx=width;
int cy=myView.getHeight()/2;
Animator anim;
if(isShow)
anim = ViewAnimationUtils.createCircularReveal(myView, cx, cy, 0,(float)width);
else
anim = ViewAnimationUtils.createCircularReveal(myView, cx, cy, (float)width, 0);
anim.setDuration((long)220);
// make the view invisible when the animation is done
anim.addListener(new AnimatorListenerAdapter() {
#Override
public void onAnimationEnd(Animator animation) {
if(!isShow)
{
super.onAnimationEnd(animation);
myView.setVisibility(View.INVISIBLE);
}
}
});
// make the view visible and start the animation
if(isShow)
myView.setVisibility(View.VISIBLE);
// start the animation
anim.start();
}
public void initSearchView()
{
final SearchView searchView = (SearchView) search_menu.findItem(R.id.action_filter_search).getActionView();
// Enable/Disable Submit button in the keyboard
searchView.setSubmitButtonEnabled(false);
// Change search close button image
ImageView closeButton = (ImageView) searchView.findViewById(R.id.search_close_btn);
closeButton.setImageResource(R.drawable.ic_close);
// set hint and the text colors
EditText txtSearch = ((EditText) searchView.findViewById(android.support.v7.appcompat.R.id.search_src_text));
txtSearch.setHint("Search..");
txtSearch.setHintTextColor(Color.DKGRAY);
txtSearch.setTextColor(getResources().getColor(R.color.colorPrimary));
// set the cursor
AutoCompleteTextView searchTextView = (AutoCompleteTextView) searchView.findViewById(android.support.v7.appcompat.R.id.search_src_text);
try {
Field mCursorDrawableRes = TextView.class.getDeclaredField("mCursorDrawableRes");
mCursorDrawableRes.setAccessible(true);
mCursorDrawableRes.set(searchTextView, R.drawable.search_cursor); //This sets the cursor resource ID to 0 or #null which will make it visible on white background
} catch (Exception e) {
e.printStackTrace();
}
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
callSearch(query);
searchView.clearFocus();
return true;
}
#Override
public boolean onQueryTextChange(String newText) {
callSearch(newText);
return true;
}
public void callSearch(String query) {
//Do searching
Log.i("query", "" + query);
if(!query.equals("")){
FirebaseRecyclerAdapter<Users, UsersViewHolder> firebaseRecyclerAdapter = new FirebaseRecyclerAdapter<Users, UsersViewHolder>(
Users.class,
R.layout.users_single_layout,
UsersViewHolder.class,
mUsersDatabase
) {
#Override
protected void populateViewHolder(UsersViewHolder usersViewHolder, Users users, int position) {
usersViewHolder.setDisplayName(users.getName());
usersViewHolder.setUserStatus(users.getStatus());
usersViewHolder.setUserImage(users.getThumb_image(), getApplicationContext());
final String user_id = getRef(position).getKey();
usersViewHolder.mView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent profileIntent = new Intent(MyUsersActivity.this, ProfileActivity.class);
profileIntent.putExtra("user_id", user_id);
startActivity(profileIntent);
}
});
}
};
mUsersList.setAdapter(firebaseRecyclerAdapter);
}
}
});
}
#Override
public boolean onCreateOptionsMenu(final Menu menu) {
getMenuInflater().inflate(R.menu.menu_home, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle item selection
switch (item.getItemId()) {
case R.id.action_search:
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
circleReveal(R.id.searchtoolbar,1,true,true);
else
searchtollbar.setVisibility(View.VISIBLE);
item_search.expandActionView();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
How can I implement the match function to retrieve what's matching in my database?

Reset RecyclerView adapter from another Fragment

I have a Fragment that contains a RecyclerView. I am trying to implement a filter on the RecyclerView. The filter UI opens a new Fragment Dialog where the user will input a value. Once the user hits the Search Button in the Fragment Dialog, the value should be returned to the RecyclerView Fragment and the existing data in the view should be cleared. I want to re-populate the RecyclerView with the new set of data that I will obtain from the server. My problem is that, I have a method called resetAdapterDetails() in the RecyclerView Fragment which works as expected if called from the RecyclerView Fragment itself. But, when I try to call the same method from the Fragment Dialog, I get an exception:
transactionList.clear(); --> is trying to clear a list which is null
Though the data is still visible in the RecyclerView.
The RecyclerView Fragment:
public class TransactionHistoryFragment extends Fragment implements SearchView.OnQueryTextListener, DateRangePickerFragment.OnDateRangeSelectedListener{
private RecyclerView recyclerview;
private TransactionHistoryAdapter adapter;
private List<Transaction> transactionList;
public TransactionHistoryFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_transaction_history, container, false);
recyclerview = (RecyclerView) view.findViewById(R.id.recyclerview);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerview.setLayoutManager(layoutManager);
return view;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setHasOptionsMenu(true);
getTransactionHistory("");
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.transactions_history_menu, menu);
final MenuItem searchItem = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(searchItem);
searchView.setOnQueryTextListener(this);
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.filter_date:
FragmentManager fmDate = getActivity().getFragmentManager();
DateRangePickerFragment dialogFragmentDate = DateRangePickerFragment.newInstance(this, true);
dialogFragmentDate.show(fmDate, "Sample Fragment");
return true;
case R.id.filter_mobile:
FragmentManager fmMobile = getActivity().getFragmentManager();
SearchMobileFragment dialogFragmentMobile = new SearchMobileFragment ();
dialogFragmentMobile.show(fmMobile, "Sample Fragment");
//resetAdapterDetails();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public boolean onQueryTextChange(String newText) {
final List<Transaction> filteredModelList = filter(transactionList, newText);
adapter.setFilter(filteredModelList);
return true;
}
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
//for filtering the list
private List<Transaction> filter(List<Transaction> models, String query) {
query = query.toLowerCase();final List<Transaction> filteredModelList = new ArrayList<>();
for (Transaction model : models) {
final String text = model.getTxnStatus().toLowerCase();
if (text.contains(query)) {
filteredModelList.add(model);
}
}
return filteredModelList;
}
//for populating the list
private void getTransactionHistory(String agentId){
GetTransactionHistoryTask task = new GetTransactionHistoryTask("agent1", "password");
task.getTransactionsByAgent("OU23","OU230000000123456789").subscribe(transactionHistoryResponse -> {
if(transactionHistoryResponse != null && transactionHistoryResponse.getTransactions() != null && transactionHistoryResponse.getTransactions().size() > 0 && transactionHistoryResponse.getErrors().size() == 0){
transactionList = transactionHistoryResponse.getTransactions();
adapter = new TransactionHistoryAdapter(transactionList);
recyclerview.addItemDecoration(new DividerItemDecoration(getActivity(), LinearLayoutManager.VERTICAL));
recyclerview.setAdapter(adapter);
onClickListnerRecyclerView();
}
else{
}
}, e -> e.printStackTrace());
}
private void onClickListnerRecyclerView() {
recyclerview.addOnItemTouchListener(
new RecyclerItemClickListener(getActivity(), new RecyclerItemClickListener.OnItemClickListener() {
#Override
public void onItemClick(View view, int position) {
try {
final Transaction transactionModel= (Transaction) adapter.getObjectAt(position);
Intent i = new Intent(getActivity(), TransactionDetailsActivity.class);
i.putExtra("transaction_object",transactionModel);
startActivity(i);
}
catch (Exception e){
Log.e("List issue", e.toString());
}
}
})
);
}
#Override
public void onDateRangeSelected(int startDay, int startMonth, int startYear, int endDay, int endMonth, int endYear) {
}
public void fetchDateRange(String startDate, String endDate) {
Log.e("DateRange",startDate + "\n" + endDate);
}
public void fetchMobileNumber(String mobileNumber) {
Log.e("Mobile",mobileNumber);
resetAdapterDetails();
}
public boolean resetAdapterDetails(){
try {
transactionList.clear();
adapter.notifyDataSetChanged();
recyclerview.setAdapter(adapter);
} catch (Exception e) {
Log.e("Reset Error", ""+e.getMessage());
}
return true;
}
}
The Dialog Fragment:
public class SearchMobileFragment extends DialogFragment {
EditText mMobileNumberEditText;
Button search_button;
public SearchMobileFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_search_mobile, container, false);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mMobileNumberEditText = (EditText) view.findViewById(R.id.mobile_number_editText);
search_button = (Button) view.findViewById(R.id.search_button);
search_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
dismiss();
TransactionHistoryFragment obj = new TransactionHistoryFragment();
obj.fetchMobileNumber(mMobileNumberEditText.getText().toString());
}
});
}
}
The fetchMobileNumber() method in the TransactionHistoryFragment (RecyclerView Fragment) is called through the fetchMobileNumber() method which is called from the SearchMobileFragment (Dialog Fragment).
Where am I going wrong? Why the transactionList.clear(); is throwing the null pointer exception?

You are getting the issue because you are creating new TransactionHistoryFragment instance search_button click in SearchMobileFragment. Which makes it's all variables null and initialize it again and here your transactionList becomes null.
You can achieve the same thing easily with different way also. As the place of SearchMobileFragment as a DialogFragment you can make it as Activity and start it as startActivityForResult from your TransactionHistoryFragment and implement onActivityResult callback to doing the fiteration.
But right now in your case you can manage it in different ways also:
First way:
As you are doing in your DialogFragment
search_button.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
dismiss();
/*TransactionHistoryFragment obj = new TransactionHistoryFragment();
obj.fetchMobileNumber(mMobileNumberEditText.getText().toString());*/
}
});
Don't do the call for fetchMobileNumber here, in onResume of your TransactionHistoryFragment you should make a call for this. On the click of search_button save the filter data to SharedPreferences and use that in onResume of the TransactionHistoryFragment for filtering and after that clear this saved data from SharedPreferences onPause of this fragment.
You should remove
transactionList.clear();
of code from resetAdapterDetails() in TransactionHistoryFragment, because after search filter you will get updated transactionList which is already passed to adapter then forcefully no need to clear it. Or have a check before clearing it like:
if(transactionList!=null){
transactionList.clear();
}
Second way: Using BroadcastReceiver you can achieve the same thing.
Register a receiver in your TransactionHistoryFragment and sendBroadcast from SearchMobileFragment. In onReceive of the TransactionHistoryFragment do the filtration process.

I had resolved the above issue in a different way. In the Dialog Fragment I have implemented a View.OnClickListener and have created an Interface to initialize the same from the RecyclerView Fragment. I am posting the complete source codes below; the SearchMobileFragment now looks like:
public class SearchMobileFragment extends DialogFragment implements View.OnClickListener{
private OnMobileNumberSelectedListener onMobileNumberSelectedListener;
EditText mMobileNumberEditText;
Button mSearchButton;
public SearchMobileFragment() {
// Required empty public constructor
}
public static SearchMobileFragment newInstance(OnMobileNumberSelectedListener callback) {
SearchMobileFragment searchMobileFragment = new SearchMobileFragment();
searchMobileFragment.initialize(callback);
return searchMobileFragment;
}
public void initialize(OnMobileNumberSelectedListener callback) {
onMobileNumberSelectedListener = callback;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View root = inflater.inflate(R.layout.fragment_search_mobile, container, false);
getDialog().getWindow().requestFeature(Window.FEATURE_NO_TITLE);
mMobileNumberEditText = (EditText) root.findViewById(R.id.mobile_number_editText);
mSearchButton = (Button) root.findViewById(R.id.search_button);
mSearchButton.setOnClickListener(this);
return root;
}
#Override
public void onStart() {
super.onStart();
if (getDialog() == null)
return;
getDialog().getWindow().setLayout(WindowManager.LayoutParams.MATCH_PARENT, WindowManager.LayoutParams.WRAP_CONTENT);
}
public void setOnMobileNumberSelectedListener(OnMobileNumberSelectedListener callback) {
this.onMobileNumberSelectedListener = callback;
}
#Override
public void onClick(View v) {
dismiss();
onMobileNumberSelectedListener.onMobileNumberSelected(mMobileNumberEditText.getText().toString());
}
public interface OnMobileNumberSelectedListener {
void onMobileNumberSelected(String mobileNumber);
}
}
The RecyclerView Fragment modifications:
public class TransactionHistoryFragment extends Fragment implements SearchView.OnQueryTextListener,
DateRangePickerFragment.OnDateRangeSelectedListener, SearchMobileFragment.OnMobileNumberSelectedListener{
private RecyclerView recyclerview;
private TransactionHistoryAdapter adapter;
private List<Transaction> transactionList;
SearchView search;
public static final String TIMERANGEPICKER_TAG = "timerangepicker";
public TransactionHistoryFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_transaction_history, container, false);
recyclerview = (RecyclerView) view.findViewById(R.id.recyclerview);
LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerview.setLayoutManager(layoutManager);
return view;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setHasOptionsMenu(true);
getTransactionHistory();
}
#Override
public void onResume() {
Log.e("onResumeTHF","invoked");
super.onResume();
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.transactions_history_menu, menu);
search = (SearchView) menu.findItem(R.id.action_search).getActionView();
search.setOnQueryTextListener(this);
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.filter_date:
FragmentManager fmDate = getActivity().getFragmentManager();
DateRangePickerFragment dialogFragmentDate = DateRangePickerFragment.newInstance(this, true);
dialogFragmentDate.show(fmDate, "Sample Fragment");
return true;
case R.id.filter_mobile:
FragmentManager fmMobile = getActivity().getFragmentManager();
SearchMobileFragment dialogFragmentMobile = SearchMobileFragment.newInstance(this);
dialogFragmentMobile.show(fmMobile, "Sample Fragment");
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public boolean onQueryTextChange(String newText) {
Log.e("newText",newText);
final List<Transaction> filteredModelList = filter(transactionList, newText);
adapter.setFilter(filteredModelList);
return true;
}
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public void onMobileNumberSelected(String mobileNumber) {
Log.e("mobileNumber",mobileNumber);
resetAdapterDetails();
}
public boolean resetAdapterDetails(){
try {
transactionList.clear();
adapter.notifyDataSetChanged();
recyclerview.setAdapter(adapter);
} catch (Exception e) {
Log.e("Reset Error", ""+e.getMessage());
}
return true;
}
}
Happy coding!

The null pointer exception is because when you create a new TransactionHistoryFragment using new onViewCreated is not called and hence transactionList is never initialized. You can create a setter for the list or pass it as a constructor to the fragment to fix this

Disable the tabswipe

I am having three tabs which i have created using android.support.v4.view.ViewPager i just want to stop the swipe horizontally by fingers but it should be working when user taps on the name of the tab.
CalorieBSearchHeading.java
public class CalorieBSearchHeading extends FragmentActivity implements ActionBar.TabListener {
private String[] tabs = { "Recent","Frequent","My Foods" };
private String[] tabss = { "Recent","Frequent","My Drinks" };
private ViewPager viewPager;
private ActionBar actionBar;
private TabsCalorieBPageAdapter mAdapter;
private String foodtype;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_caloriebsearchheading);
Bundle bundle = getIntent().getExtras();
if(bundle != null){
foodtype = bundle.getString("foodtype");
}
viewPager = (ViewPager) findViewById(R.id.pagercalorieb);
actionBar = getActionBar();
mAdapter = new TabsCalorieBPageAdapter(getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
actionBar.setStackedBackgroundDrawable(new ColorDrawable(Color.parseColor("#008080")));
if(foodtype.equals("Drinks")){
for (String tab_name : tabss) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
}
else{
for (String tab_name : tabs) {
actionBar.addTab(actionBar.newTab().setText(tab_name)
.setTabListener(this));
}
}
// Adding Tabs
/**
* on swiping the viewpager make respective tab selected
* */
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
// on changing the page
// make respected tab selected
actionBar.setSelectedNavigationItem(position);
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
});
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// app icon in action bar clicked; go home
Intent intent = new Intent(this, CalorieMainActivity.class);
intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
startActivity(intent);
return true;
default:
return super.onOptionsItemSelected(item);
}
}
CalorieBSearchHeading.xml
<android.support.v4.view.ViewPager xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/pagercalorieb"
android:layout_width="match_parent"
android:layout_height="match_parent" >
</android.support.v4.view.ViewPager>
TabOne.java
public class CalorieBTabOneRecentFood extends Fragment{
//here i have done my work
}
And Same for tab two and tab three.
what code i should add to stop swiping by fingers.

Try to set the limit in your fragment Activity.
viewPager.setOffscreenPageLimit(Number);

First you have to create your custom view pager . ex
public class CustomViewPager extends ViewPager {
private boolean enabled;
public CustomViewPager(Context context, AttributeSet attrs) {
super(context, attrs);
this.enabled = true;
}
#Override
public boolean onTouchEvent(MotionEvent event) {
if (this.enabled) {
return super.onTouchEvent(event);
}
return false;
}
#Override
public boolean onInterceptTouchEvent(MotionEvent event) {
if (this.enabled) {
return super.onInterceptTouchEvent(event);
}
return false;
}
public void setPagingEnabled(boolean enabled) {
this.enabled = enabled;
}
}
now use this viewpager in your layout like.
<yourclasspackage.CustomViewPager
android:id="#+id/viewPager"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
/>
And now set pageenable in your class.
viewPager.setPagingEnabled(false);

How to show progress when swiping between fragments?

I have an activity with pager adapter which contains some fragments. I've also created a progressBar (horizontal) on the top of the activity. I need that the bar would show the progress when I am swiping through the fragments. For example, it should be grey when I am in the first fragment then gradually grow when I swipe through the fragments and fully green when I am in the last fragment.
mainActivity.java
public class testActivity extends FragmentActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_pager_adapter);
initialisePaging();
}
private void initialisePaging() {
List<Fragment> fragments = new Vector<Fragment>();
fragments.add(Fragment.instantiate(this,fragment1.class.getName()));
fragments.add(Fragment.instantiate(this,fragment2.class.getName()));
fragments.add(Fragment.instantiate(this,fragment3.class.getName()));
PagerAdapter mPagerAdapter = new PagerAdapter(this.getSupportFragmentManager(), fragments);
ViewPager pager = (ViewPager) findViewById(R.id.viewpager);
pager.setAdapter(mPagerAdapter);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_test, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
PagerAdapter.java
public class PagerAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
public PagerAdapter(FragmentManager fm, List<Fragment> fragments) {
super(fm);
this.fragments = fragments;
}
#Override
public Fragment getItem(int arg0) {
return this.fragments.get(arg0);
}
#Override
public int getCount() {
return this.fragments.size();
}
public void setFragments(List<Fragment> fragments) {
this.fragments = fragments;
}
}

Actually I've found a very simple answer. This is what I did:
pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrollStateChanged(int arg0) {
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageSelected(int pos) {
//This is because progress is 0 at the start of the program
progress++;
ProgressBar progress = (ProgressBar) findViewById(R.id.progressBar);
progress.setProgress(position++);
}
});

You need to add OnPageChangeListener to you ViewPager in your Activity like this
pager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrollStateChanged(int arg0) {
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageSelected(int pos) {
// Update the progress bar according to pos
// Also note that you reach the end when pos == mPagerAdapter.getCount() - 1
// and that pos starts at 0 - this is the first fragment
}
});

Issue with setting and opening fragments in Android App

I am having a issue, as my app is crashing instead of opening the fragments. I have a ListActivity, that takes you to another activity; and in that other activity, there are two fragments. The ListActivity is expecting a result from one of the fragments.
My code was working prior to adding the fragments! However the fragments are no longer showing up and the app closes...does anyone possibly know what my issue could be? And any advice on how to take this issue? I sincerely appreciate all and any help, thank you! My code is below.
The ListActivity.java:
public class LyricList extends ListActivity {
private static final int ACTIVITY_CREATE=0;
private static final int ACTIVITY_EDIT=1;
private static final int INSERT_ID = Menu.FIRST;
private static final int DELETE_ID = Menu.FIRST + 1;
private LyricsDbAdapter mDbHelper;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_lyriclist);
mDbHelper = new LyricsDbAdapter(this);
mDbHelper.open();
fillData();
registerForContextMenu(getListView());
}
private void fillData() {
Cursor lyricsCursor = mDbHelper.fetchAllLyrics();
startManagingCursor(lyricsCursor);
String[] from = new String[]{LyricsDbAdapter.KEY_TITLE};
int[] to = new int[]{R.id.text1};
SimpleCursorAdapter lyrics =
new SimpleCursorAdapter(this, R.layout.lyrics_row, lyricsCursor, from, to);
setListAdapter(lyrics);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
super.onCreateOptionsMenu(menu);
menu.add(0, INSERT_ID, 0, R.string.menu_insert);
return true;
}
#Override
public boolean onMenuItemSelected(int featureId, MenuItem item) {
switch(item.getItemId()) {
case INSERT_ID:
createLyric();
return true;
}
return super.onMenuItemSelected(featureId, item);
}
#Override
public void onCreateContextMenu(ContextMenu menu, View v,
ContextMenuInfo menuInfo) {
super.onCreateContextMenu(menu, v, menuInfo);
menu.add(0, DELETE_ID, 0, R.string.menu_delete);
}
#Override
public boolean onContextItemSelected(MenuItem item) {
switch(item.getItemId()) {
case DELETE_ID:
AdapterContextMenuInfo info = (AdapterContextMenuInfo) item.getMenuInfo();
mDbHelper.deleteLyric(info.id);
fillData();
return true;
}
return super.onContextItemSelected(item);
}
private void createLyric() {
Intent i = new Intent(this, NextActivity.class);
startActivityForResult(i, ACTIVITY_CREATE);
}
#Override
protected void onListItemClick(ListView l, View v, int position, long id) {
super.onListItemClick(l, v, position, id);
Intent i = new Intent(this, NextActivity.class);
i.putExtra(LyricsDbAdapter.KEY_ROWID, id);
startActivityForResult(i, ACTIVITY_EDIT);
}
#Override
protected void onActivityResult(int requestCode, int resultCode, Intent intent) {
super.onActivityResult(requestCode, resultCode, intent);
fillData();
}
}
The other activity class that should be opening via the listActivity:
public class NextActivity extends Activity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_next);
ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
Tab one = actionBar.newTab().setText("Lyric Editor");
Tab two = actionBar.newTab().setText("Loops");
one.setTabListener(new MyTabListener(new LyricEditorFragment()));
two.setTabListener(new MyTabListener(new LoopsFragment()));
actionBar.addTab(one);
actionBar.addTab(two);
}
public class MyTabListener implements TabListener{
Fragment fragment;
public MyTabListener(Fragment f){
fragment = f;
}
#Override
public void onTabReselected(Tab arg0, FragmentTransaction ft) {
// TODO Auto-generated method stub
}
#Override
public void onTabSelected(Tab arg0, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.replace(R.id.frame1, fragment);
}
#Override
public void onTabUnselected(Tab arg0, FragmentTransaction ft) {
// TODO Auto-generated method stub
ft.remove(fragment);
}
}
}
Not sure if you want to see the fragment class, but here is this just incase:
public class LyricEditorFragment extends Fragment {
private EditText mTitleText;
private EditText mBodyText;
private Long mRowId;
private LyricsDbAdapter mDbHelper;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mDbHelper = new LyricsDbAdapter(getActivity());
mDbHelper.open();
mTitleText = (EditText) getView().findViewById(R.id.title);
mBodyText = (EditText) getView().findViewById(R.id.body);
Button confirmButton = (Button) getView().findViewById(R.id.confirm);
mRowId = (savedInstanceState == null) ? null :
(Long) savedInstanceState.getSerializable(LyricsDbAdapter.KEY_ROWID);
if (mRowId == null) {
Bundle extras = getActivity().getIntent().getExtras();
mRowId = extras != null ? extras.getLong(LyricsDbAdapter.KEY_ROWID)
: null;
}
populateFields();
confirmButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View view) {
getActivity().setResult(Activity.RESULT_OK);
getActivity().finish();
}
});
}
private void populateFields() {
if (mRowId != null) {
Cursor lyric = mDbHelper.fetchLyric(mRowId);
getActivity().startManagingCursor(lyric);
mTitleText.setText(lyric.getString(
lyric.getColumnIndexOrThrow(LyricsDbAdapter.KEY_TITLE)));
mBodyText.setText(lyric.getString(
lyric.getColumnIndexOrThrow(LyricsDbAdapter.KEY_BODY)));
}
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
saveState();
outState.putSerializable(LyricsDbAdapter.KEY_ROWID, mRowId);
}
#Override
public void onPause() {
super.onPause();
saveState();
}
#Override
public void onResume() {
super.onResume();
populateFields();
}
private void saveState() {
String title = mTitleText.getText().toString();
String body = mBodyText.getText().toString();
if (mRowId == null) {
long id = mDbHelper.createLyric(title, body);
if (id > 0) {
mRowId = id;
}
} else {
mDbHelper.updateLyric(mRowId, title, body);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
//return super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.activity_lyriceditor, container, false);
return view;
}
}

The problem is that you are getting a View from the activity which will return null.. you need to create/inflate the view from the onCreateView..
click here and follow the steps on how to create and use a view from fragment..
Click Here