We Keep Coding

when moving from one fragment to other the elements of the former staying on screen

so i got one main activity that has a Tablayout and a ViewPager to present diffrent fragments.
when i move between the fragments with my Tablayout everything works good, but if i use a button to open fragment, when going back to the former fragment (by pushing the cancel button) the elements of the fragment i left staying on the screen (as in the picture).
i tried to use a method viewPager.setCurrentItem(0); in the fragment to go back to the homepage from the fragment instade of ft.replace(R.id.fragment_edit_reminder, new Main_Activity_fragment()).commit(); but it didn't moved back to my home fragment (with the repalce it does go back but as i saied the elements.
this is my main:
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
final TabLayout tableLayout = findViewById(R.id.Tablayouting);
final ViewPager viewPager = findViewById(R.id.ViewPager);
PagerAdapter pagerAdapter = new
PagerAdapter(getSupportFragmentManager(),tableLayout.getTabCount());
viewPager.setAdapter(pagerAdapter);
tableLayout.addOnTabSelectedListener(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) {
}
});
}
}
this is the fragment:
public class edit_reminder_fragment extends Fragment implements View.OnClickListener {
private Button cancelButton;
public edit_reminder_fragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #return A new instance of fragment edit_reminder_fragment.
*/
public static edit_reminder_fragment newInstance() {
edit_reminder_fragment fragment = new edit_reminder_fragment();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
}
}
#RequiresApi(api = Build.VERSION_CODES.O)
public void onClick(View view)//TODO: make a utility method for switching fragments on the main_activity_fragment(see note).
{
switch (view.getId()) {//recognizing what button was pushed
case R.id.ButtonCancelReminder:
//region
FragmentTransaction ft = getFragmentManager().beginTransaction();
Main_Activity_fragment maf = new Main_Activity_fragment();
ft.replace(R.id.fragment_edit_reminder, maf).commit();
break;
//endregion
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_edit_reminder_fragment, container, false);
cancelButton = view.findViewById(R.id.ButtonCancelReminder);
cancelButton.setOnClickListener(this);
return view;
}
}
my pagerAdapted class:
public class PagerAdapter extends FragmentPagerAdapter {
//https://www.youtube.com/watch?v=HHd-Fa3DCng&ab_channel=MasterCoding
private int numOfTabs;
public PagerAdapter(FragmentManager fm, int numOfTabs) {
super(fm);
this.numOfTabs = numOfTabs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new Main_Activity_fragment();
case 1:
return new key_words_fragment();
case 2:
return new groups_and_points_fragment();
case 3:
return new Fragment_Past_Reminders();
case 4:
return new edit_reminder_fragment();
default:
return null;
}
}
#Override
public int getCount() {
return numOfTabs;
}
}
in the picture we see the home page fragment ,on it 3 buttons (cancel, save, Add a sub reminder) that stayed from a fragment that open when clicking on the ADD NEW REMINDER button (when clicking on cancel in the second fragment it's going back to the home page):

First, try the following as an adaper:
public class PagerAdapter extends
FragmentPagerAdapter {
private final ArrayList<Fragment> mFragments = new ArrayList<>();
private final ArrayList<String> mFragmentTitle = new ArrayList<>();
public PagerAdapter(FragmentManager mManager) {
super(mManager);
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getCount() {
return mFragments.size();
}
public void addFragment(Fragment fragment, String title) {
mFragments.add(fragment);
mFragmentTitle.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitle.get(position);
}
public Fragment getFragment(int position) {
if (position < mFragments.size() && position >= 0) {
return mFragments.get(position);
}
return null;
}
}
Then in your MainActivity's onCreate, initialize the following:
mTabs = (TabLayout) findViewById(R.id.tabs);
mPager = (ViewPager) findViewById(R.id.view_pager);
mMainAdapter = new PagerAdapter( getSupportFragmentManager() );
setupContents();
Then the private method setupContents() as follows:
mMainAdapter.addFragment(new FragmentOne(), getResources().getString(R.string.tab_albums));
mMainAdapter.addFragment(new FragmentTwo(), getResources().getString(R.string.tab_songs));
mMainAdapter.addFragment(new FragmentThree(), getResources().getString(R.string.tab_playlists));
// you can add as many fragments as you wish
//just follow the previous method #mMainAdapter.addFragment
mPager.setAdapter(mMainAdapter);
mTabs.setupWithViewPager(mPager);
To get the current fragment:
public Fragment getCurrentFragment() {
return mMainAdapter.getFragment(mPager.getCurrentItem());
}
To check if the current fragment is FragmentOne:
private boolean isFragmentOne() {
return getCurrentFragment() instanceof FragmentOne;
}

How to create an custom alertDialog from a tabbed fragment?

Problem:
I'm trying to open a custom dialog after pressing a button in my tabbed fragment.
It's seems like my MainActivity activity is sent to the dialog while i want my tabbed fragment(GroupFragment) to be sent so i can change the editText(for now) in this fragment.
Code:
public class GroupFragment extends Fragment implements AddGroupDialog.AddGroupDialogListener {
private Button addGroupButton;
private TextView textViewNoGroups;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_group, container, false);
addGroupButton = view.findViewById(R.id.addGroupButton);
textViewNoGroups = view.findViewById(R.id.textViewNoGroups);
addGroupButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
addNewGroupDialog();
}
});
scaleAnimation(addGroupButton);
return view;
}
private void scaleAnimation(View v){
Animator scale = ObjectAnimator.ofPropertyValuesHolder(v,
PropertyValuesHolder.ofFloat(View.SCALE_X, 0, 1.2f, 1),
PropertyValuesHolder.ofFloat(View.SCALE_Y, 0, 1.2f, 1)
);
scale.setDuration(600);
scale.start();
}
private void addNewGroupDialog(){
AddGroupDialog dialog = new AddGroupDialog();
assert getFragmentManager() != null;
dialog.show(getFragmentManager(), "add new group dialog");
}
#Override
public void applyString(String groupName) {
textViewNoGroups.setText(groupName);
}
}
public class AddGroupDialog extends AppCompatDialogFragment {
private EditText editTextGroupName;
private AddGroupDialogListener listener;
#NonNull
#Override
public Dialog onCreateDialog(#Nullable Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.layout_add_new_group_dialog, null);
builder.setView(view)
.setTitle("")
.setPositiveButton(R.string.confirm, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
String groupName = editTextGroupName.getText().toString();
listener.applyString(groupName);
}
});
editTextGroupName = view.findViewById(R.id.editTextGroupName);
return builder.create();
}
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
try {
listener = (AddGroupDialogListener) context;
} catch (ClassCastException e){
throw new ClassCastException(context.toString() +
"Must implement AddGroupDialogListener");
}
}
public interface AddGroupDialogListener{
void applyString(String groupName);
}
}
public class MainActivity extends AppCompatActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.setAdapter(sectionsPagerAdapter);
TabLayout tabs = findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
#StringRes
private static final int[] TAB_TITLES = new int[]{R.string.tab_text_1, R.string.tab_text_2, R.string.tab_text_3};
private final Context mContext;
public SectionsPagerAdapter(Context context, FragmentManager fm) {
super(fm);
mContext = context;
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position){
case 0:
fragment = new GroupFragment();
break;
case 1:
fragment = new AttendanceFragment();
break;
case 2:
fragment = new StatisticsFragment();
break;
}
return fragment;
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return mContext.getResources().getString(TAB_TITLES[position]);
}
#Override
public int getCount() {
return TAB_TITLES.length;
}
}
Error:
java.lang.ClassCastException: com.example.attendencetaker.MainActivity#26602bcMust implement AddGroupDialogListener
I hope my explanation of the problem is clear. Thank you!

Make the activity implement your interfaces and so on and then pass all data to the fragment with an method on the fragment. You will need an reference to actual Fragment that is displayed.
In your fragment add a method similar to this:
public void updateData(String data) {
editText.setText(data);
}
And in the override method of the interface in your activity to this:
#Override
public void update(String data) {
fragment.updateData(data);
}
Update
Use this Adapter instead:
public class SectionTabAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> fragments = new ArrayList<>();
private ArrayList<String> titles = new ArrayList<>();
public SectionTabAdapter(#NonNull FragmentManager fm, int behavior) {
super(fm, behavior);
}
public void addFragment(Fragment fragment, String title) {
fragments.add(fragment);
titles.add(title);
}
#NonNull
#Override
public Fragment getItem(int position) {
return fragments.get(position);
}
#Override
public int getCount() {
return fragments.size();
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return titles.get(position);
}
}
In your activity then do this:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SectionsPagerAdapter sectionTabAdapter = new SectionTabAdapter(this, getSupportFragmentManager());
Fragment groupFragment = new GroupFragment();
Fragment attendanceFragment = new AttendanceFragment();
Fragment statisticsFragment = new StatisticsFragment();
sectionTabAdapter.addFragment(groupFragment, context.getString(R.string.title_1);
sectionTabAdapter.addFragment(attendanceFragment, context.getString(R.string.title_2);
sectionTabAdapter.addFragment(statisticsFragment, context.getString(R.string.title_3);
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.setAdapter(sectionTabAdapter);
TabLayout tabs = findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
}

send intent with extrastring from activity to tab fragment

My app's activity hierarchy is:
MainActivity > FragActivity > FragmentExp(It includes 3 tab fragment(Tab1 Tab2 Tab3))
I have recycler view in MainActivity and when clicked in different list I want to go to Tabs with extrastrings(I mean some string message). And, show toast in those tabs.
What I've tried is:
I set intent with extrastring from my MainActivity to FragActivity like this.
if (position==1){
Intent i = new Intent(MainActivity.this, FragActivity.class);
i.putExtra(MainActivity.ENGLISHPDF, "0");
startActivity(i);
}
and get those strings directly in Tab1 and Tab2 like this:
In Tab1
code = getActivity().getIntent().getStringExtra(MainActivity.ENGLISHPDF);
if (this.code.equals("0")) {
Toast.makeText(getContext(), "hey its 1", Toast.LENGTH_SHORT).show();
}
In Tab2
code = getActivity().getIntent().getStringExtra(MainActivity.ENGLISHPDF);
if (this.code.equals("0")) {
Toast.makeText(getContext(), "hey its 2", Toast.LENGTH_SHORT).show();
}
These are my codes:
MainActivity:
public class MainActivity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener, DataAdapter.OnNoteListener{
public static final String ENGLISHPDF = "english";
RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
(...)
recyclerView = findViewById(R.id.add_header);
(...)
ArrayList<ListItem> items = new ArrayList<>();
items.add(new Item(R.drawable.green, "English", "1"));
DataAdapter adapter = new DataAdapter(items, this);
recyclerView.setAdapter(adapter);
}
#Override
public void onNoteClick(int position) {
if (position==0){
Intent i = new Intent(MainActivity.this, FragActivity.class);
i.putExtra(MainActivity.ENGLISHPDF, "0");
startActivity(i);
}
}
}
FragActivity:
public class FragActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_frag);
getSupportFragmentManager().beginTransaction().add(R.id.fragment_container,
new FragmentExplorem(), COLLAPSING_TOOLBAR_FRAGMENT_TAG).commit();
}
And finally in FragExp I've set tablayout and include 3 tabs fragment in it.
This is FragExp:
public View onCreateView(#NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab_layout, container, false);
AppBarLayout appBarLayout = view.findViewById(R.id.tab_appbar_layout);
((CoordinatorLayout.LayoutParams) appBarLayout.getLayoutParams()).setBehavior(new AppBarLayoutBehavior());
tabLayout = view.findViewById(R.id.tabs);
tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
tabLayout.setTabGravity(TabLayout.GRAVITY_CENTER);
viewPager = view.findViewById(R.id.viewpager);
viewPager.setOffscreenPageLimit(tab_count);
toolbar = view.findViewById(R.id.toolbar);
setupToolbar();
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabLayout.post(new Runnable() {
#Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
viewPager.setCurrentItem(0);
}
});
return view;
}
public class MyAdapter extends FragmentPagerAdapter {
private MyAdapter(FragmentManager fm) {
super(fm, BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0: return new Tab1();
case 1: return new Tab2();
case 2: return new Tab3();
}
return null;
}
#Override
public int getCount() {
return tab_count;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0 : {
return "First";
}
case 1 : {
return "Second";
}
case 2 : {
return "Third";
}
return null;
}
}

Get fragment instance like following function.
This way of getting instance ensures all the clients need the
instance have the same process of constructing the Fragment.
public class Tab1 extends Fragment {
private static final String KEY_CODE = "key_code";
public static Fragment newInstance(#Nullable String code) {
Bundle args = new Bundle(1);
if (code!= null)
args.putString(KEY_CODE, code);
Tab1 fragment = new Tab1();
fragment.setArguments(args);
return fragment;
}
}
when you need Tab1 instance, you should pass the parameter or null at the same time.
#Override
public Fragment getItem(int position) {
switch (position) {
case 0: return Tab1.newInstance(code);
case 1: return Tab2.newInstance(code);
case 2: return Tab3.newInstance(code);
}
return null;
}
Then you can use the code by invoking Fragment.getArguments().
// In Tab1
private String mCode;
private String DEFAULT_CODE = "0";
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mCode = getArguments().getString(KEY_CODE , DEFAULT_CODE);
// Now you can use the mCode in any place in Tab1 you want, but make sure you do Null check before using it
}
BTW, if the "code" is dynamic, then it will be totally different.

Two instances of one fragment class works incorrect

I have created tabbed activity, which has viewpager with two instances of one fragment class. This fragment contains listbox, and I have written few functions to
interact with listview items, and one function in activity to do the same thing. The point is when im trying to call fragment methods, it always trying to update the listview of fragment, which was created at first, but when i call function from activity it works absolutely correct. Whats the problem?
Here is the code of activity:
public class CategoriesActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
SparseArray<Fragment> registeredFragments = new SparseArray<>();
Toolbar toolbar;
FloatingActionButton btnAddCategories;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_categories);
assignElements();
prepareToolbar();
prepareEelements();
}
public void assignElements() {
toolbar = findViewById(R.id.action_bar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
btnAddCategories = findViewById(R.id.btnAddCategory);
// Set up the ViewPager with the sections adapter.
mViewPager = findViewById(R.id.container);
}
public void prepareToolbar() {
toolbar.setTitle("Категории");
toolbar.setTitleTextColor(getResources().getColor(R.color.colorTextLight));
toolbar.setBackgroundColor(getResources().getColor(R.color.colorPrimary));
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
}
public void prepareEelements() {
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = findViewById(R.id.tabs);
mViewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.addOnTabSelectedListener(new TabLayout.ViewPagerOnTabSelectedListener(mViewPager));
btnAddCategories.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
TabCategoriesFragment tabCategoriesFragment = (TabCategoriesFragment) getRegisteredFragment(mViewPager.getCurrentItem());
tabCategoriesFragment.addNewCategory();
}
});
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch(id) {
case R.id.home:
finish();
break;
case R.id.homeAsUp:
finish();
break;
case android.R.id.home:
finish();
break;
}
return super.onOptionsItemSelected(item);
}
public Fragment getRegisteredFragment(int position) {
return registeredFragments.get(position);
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#NonNull
#Override
public Object instantiateItem(#NonNull ViewGroup container, int position) {
Fragment fragment = (Fragment) super.instantiateItem(container, position);
registeredFragments.put(position, fragment);
return fragment;
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position) {
case 0:
fragment = TabCategoriesFragment.newInstance(false);
break;
case 1:
fragment = TabCategoriesFragment.newInstance(true);
break;
}
return fragment;
}
#Override
public int getCount() {
return 2;
}
}
}
And of the fragment:
public class TabCategoriesFragment extends Fragment {
private static final String ARG_INCOMING = "Incoming";
private OnFragmentInteractionListener mListener;
public int Incoming = -1;
ListView listView;
ArrayList<Categories> categories;
CategoriesListViewAdapter categoriesListViewAdapter;
DBHelper dbHelper;
SQLiteDatabase sqLiteDatabase;
public TabCategoriesFragment() {
}
public int selectedPostion;
public static TabCategoriesFragment newInstance(boolean Incoming) {
TabCategoriesFragment fragment = new TabCategoriesFragment();
Bundle args = new Bundle();
args.putBoolean(ARG_INCOMING, Incoming);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
if (getArguments().getBoolean(ARG_INCOMING)) {
Incoming = 1;
} else {
Incoming = 0;
}
}
}
public void assignElements(View view) {
dbHelper = new DBHelper(getContext());
sqLiteDatabase = dbHelper.getWritableDatabase();
categories = new ArrayList<>();
categoriesListViewAdapter = new CategoriesListViewAdapter(getContext(), categories);
}
#SuppressLint("ClickableViewAccessibility")
public void prepareElements() {
filldata();
listView.setAdapter(categoriesListViewAdapter);
categoriesListViewAdapter.notifyDataSetChanged();
registerForContextMenu(listView);
listView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
selectedPostion = position;
getActivity().openContextMenu(listView);
return true;
}
});
}
public void deleteCategory(boolean deletecosts, String name) {
try {
//delete from db
} catch (Exception e) {
Toast.makeText(getContext(), "Произошла ошибка" + e.getMessage(), Toast.LENGTH_SHORT).show();
}
}
public String getTableName() {
if (Incoming == 1) {
return "incomingcategories";
} else {
return "outcomingcategories";
}
}
public String getSign() {
if (Incoming == 1) {
return ">";
} else {
return "<";
}
}
#Override
public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
Objects.requireNonNull(getActivity()).getMenuInflater().inflate(R.menu.edit_category_menu, menu);
}
#Override
public boolean onContextItemSelected(MenuItem item) {
//final int selectedPostion = ((AdapterView.AdapterContextMenuInfo) item.getMenuInfo()).position;
int id = item.getItemId();
final CheckBox checkBox = new CheckBox(getContext());
switch (id) {
case R.id.categoryDelete:
deleteCategory(categories.get(selectedPosition);
filldata();
categoriesListViewAdapter.notifyDataSetChanged();
case R.id.categorySetbydefault:
break;
case R.id.categoriesSetBydefault:
setCategoryBydefault(categories.get(selectedPostion).description);
filldata();
categoriesListViewAdapter.notifyDataSetChanged();
break;
}
return true;
}
public void setCategoryBydefault(String name) {
//set
}
#Override
public void onStart() {
super.onStart();
prepareElements();
CategoriesActivity categoriesActivity = (CategoriesActivity) getActivity();
}
public void filldata() {
categories.clear();
//do some stuff
}
public void addNewCategory() {
//do some stuff
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_tab_categories, container, false);
listView = view.findViewById(R.id.CategoriesListView);
assignElements(view);
return view;
}
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
public interface OnFragmentInteractionListener {
void onFragmentInteraction(Uri uri);
}
}

Java Passing Data From One Fragment's ListView To Another Fragment

Movie ListView Fragment
Movie Info Fragment
What I have is an app that has a database of movies, in my first tab fragment I have a listview which has all the movies in my database. I want it so when I click a movie in the listview it grabs the movie's database id and moves to the next tab which displays the movie info.
Main Activity (The activity that holds my tabs view pager)
public class MainActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setOffscreenPageLimit(1);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG).setAction("Action", null).show();
}
});
}
#Override
public boolean onCreateOptionsMenu (Menu menu){
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected (MenuItem item){
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new FragmentMain();
case 1:
return new FragmentManuallyAddMovie();
case 2:
return new FragmentAddInternetMovie();
}
return null;
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "MOVIES";
case 1:
return "ADD";
case 2:
return "SEARCH";
}
return null;
}
}
public static class PlaceholderFragment extends Fragment {
private static final String ARG_SECTION_NUMBER = "section_number";
public static PlaceholderFragment newInstance(int sectionNumber) {
PlaceholderFragment fragment = new PlaceholderFragment();
Bundle args = new Bundle();
args.putInt(ARG_SECTION_NUMBER, sectionNumber);
fragment.setArguments(args);
return fragment;
}
public PlaceholderFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
FragmentMain (Where the movies database is displayed in a listview)
public class FragmentMain extends Fragment implements AdapterView.OnItemClickListener, AdapterView.OnItemLongClickListener, View.OnClickListener {
private MoviesDBHandler handler;
private SimpleCursorAdapter adapter;
private ListView lvMovies;
public FragmentMain() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_main, container, false);
handler = new MoviesDBHandler(this.getActivity());
v.findViewById(R.id.btn_delete_all_movies).setOnClickListener(this);
lvMovies = (ListView) v.findViewById(R.id.lv_movies);
lvMovies.setEmptyView(v.findViewById(R.id.tv_instructionsa));
lvMovies.setOnItemClickListener(this);
lvMovies.setOnItemLongClickListener(this);
return v;
}
#Override
public void onResume() {
super.onResume();
String[] from = {MoviesDBHelper.MOVIES_TITLE, MoviesDBHelper.MOVIES_GENRE, MoviesDBHelper.MOVIES_YEAR, MoviesDBHelper.MOVIES_PLOT, MoviesDBHelper.MOVIES_RATING, MoviesDBHelper.MOVIES_RUNTIME, MoviesDBHelper.MOVIES_IMAGE_URL};
int[] to = {R.id.tv_title, R.id.tv_genre, R.id.tv_year, R.id.tv_plot, R.id.tv_rating, R.id.tv_runtime, R.id.img_movie_poster};
adapter = new SimpleCursorAdapter(this.getActivity(), R.layout.movie_list_item, handler.getMovies(), from, to, CursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);
adapter.setViewBinder(new SimpleCursorAdapter.ViewBinder() {
#Override
public boolean setViewValue(View view, Cursor cursor, int columnIndex) {
if(columnIndex == cursor.getColumnIndex(MoviesDBHelper.MOVIES_IMAGE_URL)) {
DatabaseDownloadImage task = new DatabaseDownloadImage((ImageView) view);
task.execute(cursor.getString(columnIndex));
return true;
}
return false;
}
});
lvMovies.setAdapter(adapter);
}
public class DatabaseDownloadImage extends AsyncTask<String, Integer, Bitmap> {
private ImageView imageView;
public DatabaseDownloadImage(ImageView imageView) {
this.imageView = imageView;
}
#Override
protected Bitmap doInBackground(String... params) {
String address = params[0];
HttpURLConnection connection = null;
Bitmap b = null;
try {
URL url = new URL(address);
connection = (HttpURLConnection) url.openConnection();
if (connection.getResponseCode() != HttpURLConnection.HTTP_OK) {
return null;
}
else {
b = BitmapFactory.decodeStream(connection.getInputStream());
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return b;
}
protected void onPostExecute(Bitmap bitmap) {
if (bitmap == null) {
return;
}
imageView.setImageBitmap(Bitmap.createScaledBitmap(bitmap, 120, 180, false));
}
}
#Override
public void onClick(View v) {
switch (v.getId()) {
//Delete all movies from database
case R.id.btn_delete_all_movies:
AlertDialog deleteMovieDialog = new AlertDialog.Builder(this.getActivity()).create();
deleteMovieDialog.setTitle("Delete All Movies?");
deleteMovieDialog.setIcon(R.drawable.ic_delete);
deleteMovieDialog.setButton(DialogInterface.BUTTON_POSITIVE, "No", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
deleteMovieDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
handler.deleteAllMovies();
adapter.changeCursor(handler.getMovies());
}
});
deleteMovieDialog.show();
break;
}
}
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
}
#Override
public boolean onItemLongClick(AdapterView<?> parent, View view, int position, final long id) {
AlertDialog deleteMovieDialog = new AlertDialog.Builder(this.getActivity()).create();
deleteMovieDialog.setTitle("Delete Movie?");
deleteMovieDialog.setIcon(R.drawable.ic_delete);
deleteMovieDialog.setButton(DialogInterface.BUTTON_POSITIVE, "No", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
}
});
deleteMovieDialog.setButton(DialogInterface.BUTTON_NEGATIVE, "Yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
handler.deleteMovie(id);
adapter.changeCursor(handler.getMovies());
}
});
deleteMovieDialog.show();
return true;
}
}

All Fragment-to-Fragment communication is done through the associated
Activity. Two Fragments should never communicate directly.
http://developer.android.com/intl/es/training/basics/fragments/communicating.html
You can communicate the two fragments with a static variable in the MainActivity that you change in the first fragment and get the content of this variable in the second fragment.
Update:
Create Movie.class, to save all the data of a one movie:
public class Movie() {
String title;
String genre;
int year;
String plot;
int rating;
int runtime;
String img;
public Movie(String title, String genre, int year, String plot, int rating, int runtime, String img) {
this.title=title;
this.genre=genre;
this.year=year;
this.plot=plot;
this.rating=rating;
this.runtime=runtime;
this.img=img;
}
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title=title;
}
//The same for the other variables
}
and in your MainActivity create a static variable of Movie:
public static Movie movie;
In onClick method save the data of the movie:
MainActivity.movie=new Movie(title, genre, year,plot,rating,runtime,img);
And to get the movie in the second fragment:
String title=MainActivity.movie.getTitle();
String genre=MainActivity.movie.getGenre();
...