Only one row is displayed in ListView: Android

Only one row is displayed in ListView: Android - java

I am trying to create an activity wherein I have added a search facility to search contacts in the phonebook and list the selected contacts in a ListView.
I have been able to get one row of the ListView working. However, when I try to add another contact, it just replaces the first row. I am new to android app development. Unable to figure out how to get the desired output.
Here is my code:
import android.app.SearchManager;
import android.app.SearchableInfo;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.graphics.Typeface;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.v4.app.NavUtils;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.CursorAdapter;
import android.widget.ListView;
import android.widget.SearchView;
import android.widget.TextView;
public class FamilyAndFriends extends AppCompatActivity {
Typeface mytypeface1;
SearchView searchView;
ListView contactlist;
View contact_listview;
LayoutInflater layoutInflater;
Cursor nameCursor;
CursorAdapter nameAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_family_and_friends);
TextView textView = (TextView) findViewById(R.id.textView9);
mytypeface1 = Typeface.createFromAsset(getAssets(), "Roboto-Light.ttf");
textView.setTypeface(mytypeface1);
Toolbar toolbar = (Toolbar) findViewById(R.id.app_bar);
toolbar.setTitle("Friends & Family");
setSupportActionBar(toolbar);
getSupportActionBar().setHomeButtonEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
searchView = (SearchView) findViewById(R.id.searchView);
setupSearchView();
layoutInflater = getLayoutInflater();
contactlist = (ListView) findViewById(R.id.listView);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_user_info, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
switch (id) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
break;
case R.id.next:
startActivity(new Intent(this, Settings.class));
break;
}
return true;
}
private void setupSearchView() {
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
SearchableInfo searchableInfo = searchManager.getSearchableInfo(getComponentName());
searchView.setSearchableInfo(searchableInfo);
searchView.setQueryRefinementEnabled(true);
searchView.setIconifiedByDefault(false);
}
private String getDisplayContactName(Intent intent) {
nameCursor = getContentResolver().query(intent.getData(), null, null, null, null);
nameCursor.moveToFirst();
int idDisplayName = nameCursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME);
return nameCursor.getString(idDisplayName);
}
#Override
protected void onNewIntent(Intent intent) {
if (ContactsContract.Intents.SEARCH_SUGGESTION_CLICKED.equals(intent.getAction())) {
final String CONTACT_NAME = getDisplayContactName(intent);
nameAdapter = new CursorAdapter(this, nameCursor, false) {
#Override
public View newView(Context context, Cursor cursor, ViewGroup parent) {
contact_listview = layoutInflater.inflate(R.layout.contact_listview, parent, false);
return contact_listview;
}
#Override
public void bindView(View view, Context context, Cursor cursor) {
final TextView name_Contact = (TextView) view.findViewById(R.id.contact_name);
name_Contact.setText(CONTACT_NAME);
name_Contact.setTypeface(mytypeface1);
}
};
}
contactlist.setAdapter(nameAdapter);
}
#Override
protected void onStop() {
super.onStop();
if (nameCursor != null) {
nameCursor.close();
}
}
}
Any helps???

Most likely it sounds like you are returning only one item in your getItemCount()
#Override
public int getItemCount() {
return list.size();
}
you need to return the size of the list that you are passing in your adapter

Related

How to unregister and register BroadcastReceiver from another class? [duplicate]

Thank you in advance and dont be very hard with me, it is my first question.
I was trying to add a new item to my recyclerView through the adapter by declaring a method in my adapter called addItem(String newItem)
Then I tried to call this method when the floating button is clikced and the problem is that the method does not even appear when i hit cntrl+space and if i write it down it gets on red.
I have already tried to rebuild the project and nothing changes.
¿Any ideas about how to solve it?
MainActivity class
package com.example.sakur.recyclerviewapp;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.util.Log;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.ListIterator;
public class MainActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private FloatingActionButton mFloatingActionButton;
private List<String> recyclerItems = Collections.emptyList();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
recyclerItems = new ArrayList<>();
recyclerItems.add("First item");
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new MyAdapter(recyclerItems);
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.floating_action_button);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
String itemNuevo = "New Card";
mAdapter.addItem(itemNuevo);
Snackbar.make(view, "Item added successfully", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
}
#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_main, 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);
}
}
and the MyAdapter class
package com.example.sakur.recyclerviewapp;
import android.content.Context;
import android.graphics.drawable.Drawable;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import java.util.Collections;
import java.util.List;
/**
* Created by Sakur on 19/12/2015.
*/
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder> {
private List<String> mDataset= Collections.emptyList();
// Provide a reference to the views for each data item
// Complex data items may need more than one view per item, and
// you provide access to all the views for a data item in a view holder
// Provide a suitable constructor (depends on the kind of dataset)
public MyAdapter(List<String> myDataset) {
mDataset = myDataset;
}
public void addItem(String newItem){
mDataset.add(newItem);
notifyDataSetChanged();
}
// Create new views (invoked by the layout manager)
#Override
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
// create a new view
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_card, parent, false);
// set the view's size, margins, paddings and layout parameters
//...
ViewHolder vh = new ViewHolder(v);
return vh;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
// - get element from your dataset at this position
// - replace the contents of the view with that element
holder.mTextView.setText(mDataset.get(position));
}
// Return the size of your dataset (invoked by the layout manager)
#Override
public int getItemCount() {
return mDataset.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
// each data item is just a string in this case
public TextView mTextView;
public ImageView mImageView;
public ViewHolder(View v) {
super(v);
mTextView = (TextView) v.findViewById(R.id.text_card);
}
}
}

addItem(String) is not a method of RecyclerView.Adapter, but of your MyAdapter subclass. Obviously, RecyclerView.Adapter has no knowledge of the existence neither of your MyAdapter nor of your addItem(String).
you can either change
private RecyclerView.Adapter mAdapter;
into
private MyAdapter mAdapter;
or cast mAdapter. E.g.
if (mAdater instanceof MyAdapter) {
((MyAdapter) mAdapter).addItem(...);
}

Why am I getting this error "FirebaseRecyclerAdapter() in FirebaseRecyclerAdapter cannot be applied to:" [duplicate]

This question already has answers here:
firebaserecycleradapter() cannot be applied to FirebaseRecyclerAdapter
(5 answers)
Closed 3 years ago.
I am developing an app with posts and am using Firebase as my backend platform.
As followed, I tried to add the FirebaseRecyclerAdapter, followed the instructions as given but am getting this error, that the guy in the video isn't, and I am not being able to fix it.
Here is my code:
import android.annotation.SuppressLint;
import android.content.Intent;
import android.gesture.GestureOverlayView;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.TextView;
import android.widget.Toolbar;
import androidx.annotation.NonNull;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.ActionBarDrawerToggle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.multidex.MultiDex;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.shrinkio.Fragments.HomeFragment;
import com.example.shrinkio.Fragments.MessagesFragment;
import com.example.shrinkio.Fragments.NotFragment;
import com.example.shrinkio.Fragments.PeopleFragment;
import com.example.shrinkio.R;
import com.example.shrinkio.SecondaryActivities.DrawerLayout;
import com.example.shrinkio.SecondaryActivities.PostActivity;
import com.example.shrinkio.SecondaryActivities.Posts;
import com.example.shrinkio.SecondaryActivities.ProfileActivity;
import com.example.shrinkio.SecondaryActivities.SettingsActivity;
import com.firebase.ui.database.FirebaseRecyclerAdapter;
import com.firebase.ui.database.FirebaseRecyclerOptions;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.google.android.material.navigation.NavigationView;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.Query;
import com.google.firebase.storage.StorageReference;
import java.util.Objects;
import static com.example.shrinkio.R.menu.main_menu;
public class BottomActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
RadioGroup radioGroup;
RadioButton Rd1, Rd2, Rd3, Rd4;
RecyclerView rv;
private ActionBar actionBar;
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mDrawerToggle;
private StorageReference StorageRef;
private Toolbar toolbar;
private DatabaseReference mDataBase;
#SuppressLint({"RtlHardcoded", "ClickableViewAccessibility"})
#Override
protected void onCreate(Bundle savedInstanceState) {
MultiDex.install(this);
super.onCreate( savedInstanceState );
setContentView( R.layout.activity_bottom );
new GestureOverlayView( this );
//Action bar configurations
Objects.requireNonNull( getSupportActionBar() ).setDisplayOptions( ActionBar.DISPLAY_SHOW_CUSTOM);
getSupportActionBar().setCustomView( R.layout.abs_layout_home );
//Navigation view
NavigationView nav_view;
nav_view = findViewById(R.id.nav_view); //select nav_view from activity_drawer_layout
nav_view.setNavigationItemSelectedListener(this);
View nav_header = nav_view.getHeaderView(0);
rv = findViewById(R.id.recyclerView);
rv.setHasFixedSize(true);
rv.setLayoutManager(new LinearLayoutManager(this));
mDataBase = FirebaseDatabase.getInstance().getReference().child("Posts");
//Navigation Drawer header menu items on click actions
LinearLayout header = nav_header.findViewById( R.id.nav_header);
header.setOnClickListener( new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity( new Intent( BottomActivity.this, ProfileActivity.class ) );
}
} );
BottomNavigationView bottomNav = findViewById(R.id.bottom_navigation);
bottomNav.setOnNavigationItemSelectedListener(navListener);
//I added this if statement to keep the selected fragment when rotating the device
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
new HomeFragment()).commit();
}
}
#Override
protected void onStart() {
super.onStart();
FirebaseRecyclerOptions<Posts> options = new FirebaseRecyclerOptions.Builder<Posts>()
.setQuery(mDataBase, Posts.class)
.build();
FirebaseRecyclerAdapter firebaseRecyclerAdapter = new FirebaseRecyclerAdapter <Posts, PostViewHolder> (
Posts.class,
R.layout.posts,
PostViewHolder.class,
mDataBase
) {
#Override
protected void onBindViewHolder(#NonNull PostViewHolder holder, int position, Posts model) {
holder.setPost(model.getPost());
}
#NonNull
#Override
public PostViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.posts, parent, false);
return new PostViewHolder(view);
}
};
rv.setAdapter(firebaseRecyclerAdapter);
}
public static class PostViewHolder extends RecyclerView.ViewHolder{
View mview;
public PostViewHolder(#NonNull View itemView) {
super(itemView);
mview = itemView;
}
public void setPost(String post) {
TextView post_title = mview.findViewById(R.id.post);
post_title.setText(post);
}
}
//Define the options menu
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(main_menu, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
{
if (item.getItemId() == R.id.add){
startActivity(new Intent(this, PostActivity.class));
}
}
return super.onOptionsItemSelected(item);
}
// Bottom Navigation View, when the fragment is selected
private BottomNavigationView.OnNavigationItemSelectedListener navListener =
new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment selectedFragment = null;
switch (item.getItemId()) {
case R.id.navigation_home:
selectedFragment = new HomeFragment();
break;
case R.id.navigation_dashboard:
selectedFragment = new NotFragment();
break;
case R.id.navigation_people:
selectedFragment = new PeopleFragment();
break;
case R.id.navigation_messages:
selectedFragment = new MessagesFragment();
}
getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container,
selectedFragment).commit();
return true;
}
};
// Navigation menu items on click action
#Override
public boolean onNavigationItemSelected (#NonNull MenuItem item){
switch (item.getItemId()) {
case R.id.nav_profile:
startActivity( new Intent( BottomActivity.this, ProfileActivity.class ) );
overridePendingTransition( 0, 0 );
return true;
case R.id.nav_settings:
startActivity( new Intent( BottomActivity.this, SettingsActivity.class ) );
overridePendingTransition( 0, 0 );
return true;
default:
return super.onOptionsItemSelected( item );
}
}
#Override
public void onBackPressed() {
super.onBackPressed();
}
}
I am getting the error that I typed in the question.
None of the answers on StackOverflow worked for me, that's why I am making a new post.

Change this:
FirebaseRecyclerAdapter firebaseRecyclerAdapter = new FirebaseRecyclerAdapter <Posts, PostViewHolder> (
Posts.class,
R.layout.posts,
PostViewHolder.class,
mDataBase
)
Into this:
FirebaseRecyclerAdapter firebaseRecyclerAdapter = new FirebaseRecyclerAdapter <Posts, PostViewHolder> (options)
In the new version of Firebaseui, the constructor of FirebaseRecyclerAdapter take a parameter of type FirebaseRecyclerOption which you already initialized
Check the documentation:
https://github.com/firebase/FirebaseUI-Android/blob/master/database/README.md#firebaseui-for-realtime-database

Method to start the activity seems to be missing. Try including the below code in onStart() method:
firebaseRecyclerAdapter.startListening();
FirebaseRecyclerAdapter uses an event listener to monitor changes to the Firebase query.
For listening for data, call adapter.startListening(). Detailed information is available on the below link
FirebaseRecyclerAdapter lifecycle

How to pass data between fragments in FragmentPagerAdapter

For my academic project, I want create an application with 4 tabs. The first one will show recent games added to a list, the second one will be a search form, the third will show the search result, and the last one will show the details. I currently have created the code for TabView and the 4 tabs. The problem is that I want to perform a search to get the items I have in a list which meet the search criteria on fragment 2, but I don't know how to pass the data from fragment 2 (textView data and spinner) to fragment 3. My code is the following:
MainActivity.java:
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TabLayout;
import android.view.MenuInflater;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setImageResource(R.drawable.ic_search_white_24dp);
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();
}
});
//TabLayout function call
configureTabLayout();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.menu_exit:
finish();
return true;
case R.id.menu_settings:
Toast.makeText(this, "Under Construction", Toast.LENGTH_LONG).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
//Tab Layout function declaration
private void configureTabLayout() {
//Getting the tab layout
TabLayout tabLayout = findViewById(R.id.tab_layout);
//Adding Tabs
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.ic_home_white_24dp));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.ic_search_white_24dp));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.ic_results_white_24dp));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.ic_details_white_24dp));
//The TabPagerAdapter instance is then
//assigned as the adapter for the ViewPager and the TabLayout component added
//to the page change listener
final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new TabPagerAdapter
(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
//Finally, the onTabSelectedListener is configured on the TabLayout instance and
//the onTabSelected() method implemented to set the current page on the
//ViewPager based on the currently selected tab number.
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.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) {
}
});
}
}
TabPagerAdapter.java
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class TabPagerAdapter extends FragmentPagerAdapter{
int tabCount;
public TabPagerAdapter(FragmentManager fm, int numberOfTabs) {
super(fm);
this.tabCount = numberOfTabs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new HomeScreenFragment();
case 1:
return new SearchFormFragment();
case 2:
return new SearchResultsFragment();
case 3:
return new DetailsScreenFragment();
default:
return null;
}
}
#Override
public int getCount() {
return tabCount;
}
}
SearchFormFragment.java
package gr.pliroforiki_edu.videogamedb;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
/**
* A simple {#link Fragment} subclass.
*/
public class SearchFormFragment extends Fragment {
private Button searchButton;
private EditText gameTitleEditText;
Spinner spinnerGenre;
public SearchFormFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View searchFormView = inflater.inflate(R.layout.fragment_search_form, container, false);
searchButton = searchFormView.findViewById(R.id.searchButton);
gameTitleEditText = searchFormView.findViewById(R.id.game_title_editText);
spinnerGenre = searchFormView.findViewById(R.id.genre_spinner);
ArrayAdapter<CharSequence> genreAdapter = ArrayAdapter.createFromResource(
getActivity(),
R.array.game_genres,
android.R.layout.simple_spinner_item
);
genreAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerGenre.setAdapter(genreAdapter);
searchButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String filterGameTitle = gameTitleEditText.getText().toString();
int filterGenreId = spinnerGenre.getSelectedItemPosition();
String message = String.format("Game Title: %s\n Genre: %s", filterGameTitle, filterGenreId);
Toast.makeText(getActivity(),message, Toast.LENGTH_LONG).show();
}
});
// Inflate the layout for this fragment
//return inflater.inflate(R.layout.fragment_search_form, container, false);
return searchFormView;
}
}
SearchResultsFragment.java
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.TextView;
/**
* A simple {#link Fragment} subclass.
*/
public class SearchResultsFragment extends Fragment {
TextView infoTextView;
ListView listViewGames;
public SearchResultsFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View searchResultsView = inflater.inflate(R.layout.fragment_search_results, container, false);
return searchResultsView;
}
private void findViews()
{
infoTextView = getActivity().findViewById(R.id.info_textView);
listViewGames = getActivity().findViewById(R.id.games_listView);
}
}
I want to archive the following via the fragments:
ListActivity.java
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import android.widget.TextView;
public class ListActivity extends AppCompatActivity {
private TextView textViewInfo;
private ListView listViewBooks;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
// Animation when this Activity appears
overridePendingTransition(R.anim.pull_in_from_right, R.anim.hold);
// Get user filters from Intent
Intent intent = getIntent();
String filterAuthor = intent.getStringExtra("AUTHOR");
String filterTitle = intent.getStringExtra("TITLE");
int filterGenreId = intent.getIntExtra("GENREID", 0);
findViews();
// Show user filters for information
String message = String.format("Author: %s\nTitle: %s\nGenreId: %d",
filterAuthor, filterTitle, filterGenreId);
textViewInfo.setText(message);
DataStore.LoadBooks(filterAuthor, filterTitle, filterGenreId);
//Complex Object Binding
ListAdapter booksAdapter = new SimpleAdapter(
this,
DataStore.Books,
R.layout.list_item,
new String[]{DataStore.KEY_TITLE, DataStore.KEY_AUTHOR, DataStore.KEY_GENRENAME},
new int[]{R.id.book_item_title, R.id.book_item_author, R.id.book_item_genre}
);
listViewBooks.setAdapter(booksAdapter);
listViewBooks.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Intent detailsIntent = new Intent(ListActivity.this, DetailsActivity.class);
detailsIntent.putExtra(DataStore.KEY_POSITION, position);
startActivity(detailsIntent);
}
});
}
#Override
protected void onPause(){
overridePendingTransition(R.anim.hold, R.anim.push_out_to_right);
super.onPause();
}
private void findViews(){
textViewInfo = findViewById(R.id.textViewInfo);
listViewBooks = findViewById(R.id.listViewBooks);
}
}
Mainactivity.java
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
private EditText textAuthor;
private EditText textTitle;
private EditText textGenre;
private Button buttonSearch;
private Spinner spinnerGenre;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
DataStore.Init(getApplicationContext());
textAuthor = findViewById(R.id.editTextAuthor);
textTitle= findViewById(R.id.editTextAuthor);
buttonSearch = findViewById(R.id.buttonSearch);
spinnerGenre = (Spinner) findViewById(R.id.spinnerGenre);
ArrayAdapter<CharSequence> genreAdapter = ArrayAdapter.createFromResource(
this,
R.array.book_genres,
android.R.layout.simple_spinner_item
);
genreAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerGenre.setAdapter(genreAdapter);
buttonSearch.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String filterAuthor = textAuthor.getText().toString();
String filterTitle = textTitle.getText().toString();
int filterGenreId = spinnerGenre.getSelectedItemPosition();
Intent intent = new Intent(MainActivity.this, ListActivity.class);
intent.putExtra("AUTHOR", filterAuthor);
intent.putExtra("TITLE", filterTitle);
intent.putExtra("GENREID", filterGenreId);
startActivity(intent);
}
});
}
}

Try this
pass value between two fragment using bundle
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
public class TabPagerAdapter extends FragmentPagerAdapter{
int tabCount;
public TabPagerAdapter(FragmentManager fm, int numberOfTabs) {
super(fm);
this.tabCount = numberOfTabs;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new HomeScreenFragment();
case 1:
return new SearchFormFragment();
case 2:
Fragment fragment = new SearchResultsFragment()
Bundle args = new Bundle();
args.putString("Key", "Value");
fragment.setArguments(args);
return fragment;
case 3:
return new DetailsScreenFragment();
default:
return null;
}
}
#Override
public int getCount() {
return tabCount;
}
}
in your onCreateView(....) of SearchResultsFragment
String value = getArguments().getString("Key");
public class SearchResultsFragment extends Fragment {
TextView infoTextView;
ListView listViewGames;
public SearchResultsFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View searchResultsView =
inflater.inflate(R.layout.fragment_search_results, container, false);
String value = getArguments().getString("Key");
return searchResultsView;
}
private void findViews(){
infoTextView = getActivity().findViewById(R.id.info_textView);
listViewGames = getActivity().findViewById(R.id.games_listView);
}
}
hop its help you

There are many ways you can pass objects/values between fragments. In your case, the simplest solution would be to delegate those values to the holding Activity i.e MainActivity.
MainActivity:
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.design.widget.TabLayout;
import android.view.MenuInflater;
import android.view.View;
import android.support.design.widget.NavigationView;
import android.support.v4.view.GravityCompat;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.widget.Button;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
//these will hold your values
String filterGameTitle;
int filterGenreId;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setImageResource(R.drawable.ic_search_white_24dp);
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();
}
});
//TabLayout function call
configureTabLayout();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ActionBarDrawerToggle toggle = new ActionBarDrawerToggle(
this, drawer, toolbar, R.string.navigation_drawer_open, R.string.navigation_drawer_close);
drawer.addDrawerListener(toggle);
toggle.syncState();
NavigationView navigationView = (NavigationView) findViewById(R.id.nav_view);
navigationView.setNavigationItemSelectedListener(this);
}
#Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
super.onBackPressed();
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case R.id.menu_exit:
finish();
return true;
case R.id.menu_settings:
Toast.makeText(this, "Under Construction", Toast.LENGTH_LONG).show();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
#SuppressWarnings("StatementWithEmptyBody")
#Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
if (id == R.id.nav_camera) {
// Handle the camera action
} else if (id == R.id.nav_gallery) {
} else if (id == R.id.nav_slideshow) {
} else if (id == R.id.nav_manage) {
} else if (id == R.id.nav_share) {
} else if (id == R.id.nav_send) {
}
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
return true;
}
//Tab Layout function declaration
private void configureTabLayout() {
//Getting the tab layout
TabLayout tabLayout = findViewById(R.id.tab_layout);
//Adding Tabs
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.ic_home_white_24dp));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.ic_search_white_24dp));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.ic_results_white_24dp));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.ic_details_white_24dp));
//The TabPagerAdapter instance is then
//assigned as the adapter for the ViewPager and the TabLayout component added
//to the page change listener
final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
final PagerAdapter adapter = new TabPagerAdapter
(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
//Finally, the onTabSelectedListener is configured on the TabLayout instance and
//the onTabSelected() method implemented to set the current page on the
//ViewPager based on the currently selected tab number.
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.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) {
}
});
}
}
SearchFormFragment:
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
/**
* A simple {#link Fragment} subclass.
*/
public class SearchFormFragment extends Fragment {
private Button searchButton;
private EditText gameTitleEditText;
Spinner spinnerGenre;
public SearchFormFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(final LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View searchFormView = inflater.inflate(R.layout.fragment_search_form, container, false);
searchButton = searchFormView.findViewById(R.id.searchButton);
gameTitleEditText = searchFormView.findViewById(R.id.game_title_editText);
spinnerGenre = searchFormView.findViewById(R.id.genre_spinner);
ArrayAdapter<CharSequence> genreAdapter = ArrayAdapter.createFromResource(
getActivity(),
R.array.game_genres,
android.R.layout.simple_spinner_item
);
genreAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinnerGenre.setAdapter(genreAdapter);
searchButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String filterGameTitle = gameTitleEditText.getText().toString();
int filterGenreId = spinnerGenre.getSelectedItemPosition();
((MainActivity)getActivity()).filterGameTitle = filterGameTitle;
((MainActivity)getActivity()).filterGenreId = filterGenreId;
String message = String.format("Game Title: %s\n Genre: %s", filterGameTitle, filterGenreId);
Toast.makeText(getActivity(),message, Toast.LENGTH_LONG).show();
}
});
// Inflate the layout for this fragment
//return inflater.inflate(R.layout.fragment_search_form, container, false);
return searchFormView;
}
}
SearchResultFragment:
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.TextView;
/**
* A simple {#link Fragment} subclass.
*/
public class SearchResultsFragment extends Fragment {
TextView infoTextView;
ListView listViewGames;
String filterGameTitle;
int filterGenreId;
public SearchResultsFragment() {
// Required empty public constructor
}
#Override
public void onAttach(Context context)
{
filterGameTitle = ((MainActivity)getActivity()).filterGameTitle;
filterGenreId = ((MainActivity)getActivity()).filterGenreId;
super.onAttach(context);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View searchResultsView = inflater.inflate(R.layout.fragment_search_results, container, false);
return searchResultsView;
}
private void findViews()
{
infoTextView = getActivity().findViewById(R.id.info_textView);
listViewGames = getActivity().findViewById(R.id.games_listView);
}
}

You can use interface to send your search string to your activity from fragment 2, and from their you can call all methods in your fragment 3 as fragment3 object will be available to you in your activity, you can make performSearch() in your fragment3 and call it from your activity.
Alternatively you can use something like event bus to avoid the boiler plate code needed to setup interface.
Have a look at this event bus repo https://github.com/greenrobot/EventBus
Register event bus where you want the search string, in your case register the event bus in Fragment3 like this
#Override
public void onStart() {
super.onStart();
EventBus.getDefault().register(this);
}
#Override
public void onStop() {
super.onStop();
EventBus.getDefault().unregister(this);
}
In your Fragment 3 create a function like this
#Subscribe
public void onSearchEvent(String searchString){
//you will get your search string here
}
Now comeback to fragment2 from where you want to send the searchString, you have to put below code from where you want to send searchString, and this posted searchString will be received by fragment 3 in its onSearchEvent method
EventBus.getDefault().post(searchString);

Complete android cardView with db helper and recycleView

I am pretty new to this whole android development but I am looking to create a simple android app making use of a sql database, cardViews and a RecycleView.
The app I have so far works but I am trying to add a button to the DetailedActivity which will allow me to remove the entry from the database.
The desired workflow would be:
Get Data
Select a CardView
Click New Button (will be
delete)
Go back to CardView, Remove entry on which the button has
been pressed and populate the CardView.
RecyclerAdapter.java
package com.example.prabhu.databasedemo;
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ViewHolder> {
static List<DatabaseModel> dbList;
static Context context;
RecyclerAdapter(Context context, List<DatabaseModel> dbList ){
this.dbList = new ArrayList<DatabaseModel>();
this.context = context;
this.dbList = dbList;
}
#Override
public RecyclerAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemLayoutView = LayoutInflater.from(parent.getContext()).inflate(
R.layout.item_row, null);
// create ViewHolder
ViewHolder viewHolder = new ViewHolder(itemLayoutView);
return viewHolder;
}
#Override
public void onBindViewHolder(RecyclerAdapter.ViewHolder holder, int position) {
holder.name.setText(dbList.get(position).getName());
holder.email.setText(dbList.get(position).getEmail());
}
#Override
public int getItemCount() {
return dbList.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView name,email;
public ViewHolder(View itemLayoutView) {
super(itemLayoutView);
name = (TextView) itemLayoutView
.findViewById(R.id.rvname);
email = (TextView)itemLayoutView.findViewById(R.id.rvemail);
itemLayoutView.setOnClickListener(this);
}
#Override
public void onClick(View v) {
Intent intent = new Intent(context,DetailsActivity.class);
Bundle extras = new Bundle();
extras.putInt("position",getAdapterPosition());
intent.putExtras(extras);
/*
int i=getAdapterPosition();
intent.putExtra("position", getAdapterPosition());*/
context.startActivity(intent);
Toast.makeText(RecyclerAdapter.context, "you have clicked Row " + getAdapterPosition(), Toast.LENGTH_SHORT).show();
}
}
}
DatabaseHelper.java
package com.example.prabhu.databasedemo;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
import android.util.Log;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class DatabaseHelpher extends SQLiteOpenHelper {
private static final String DATABASE_NAME="student";
private static final int DATABASE_VERSION = 1;
private static final String STUDENT_TABLE = "stureg";
private static final String STU_TABLE = "create table "+STUDENT_TABLE +"(name TEXT,email TEXT primary key,roll TEXT,address TEXT,branch TEXT)";
Context context;
public DatabaseHelpher(Context context) {
super(context, DATABASE_NAME, null, DATABASE_VERSION);
this.context = context;
}
#Override
public void onCreate(SQLiteDatabase db) {
db.execSQL(STU_TABLE);
}
#Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
db.execSQL("DROP TABLE IF EXISTS " + STUDENT_TABLE);
// Create tables again
onCreate(db);
}
/* Insert into database*/
public void insertIntoDB(String name,String email,String roll,String address,String branch){
Log.d("insert", "before insert");
// 1. get reference to writable DB
SQLiteDatabase db = this.getWritableDatabase();
// 2. create ContentValues to add key "column"/value
ContentValues values = new ContentValues();
values.put("name", name);
values.put("email", email);
values.put("roll", roll);
values.put("address", address);
values.put("branch", branch);
// 3. insert
db.insert(STUDENT_TABLE, null, values);
// 4. close
db.close();
Toast.makeText(context, "insert value", Toast.LENGTH_SHORT);
Log.i("insert into DB", "After insert");
}
/* Retrive data from database */
public List<DatabaseModel> getDataFromDB(){
List<DatabaseModel> modelList = new ArrayList<DatabaseModel>();
String query = "select * from "+STUDENT_TABLE;
SQLiteDatabase db = this.getWritableDatabase();
Cursor cursor = db.rawQuery(query,null);
if (cursor.moveToFirst()){
do {
DatabaseModel model = new DatabaseModel();
model.setName(cursor.getString(0));
model.setEmail(cursor.getString(1));
model.setRoll(cursor.getString(2));
model.setAddress(cursor.getString(3));
model.setBranch(cursor.getString(4));
modelList.add(model);
}while (cursor.moveToNext());
}
Log.d("student data", modelList.toString());
return modelList;
}
/*delete a row from database*/
public void deleteARow(String email){
SQLiteDatabase db= this.getWritableDatabase();
db.delete(STUDENT_TABLE, "email" + " = ?", new String[] { email });
db.close();
}
}
DatabaseModel.java
package com.example.prabhu.databasedemo;
public class DatabaseModel {
private String name;
private String roll;
private String address;
private String branch;
private String email;
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getRoll() {
return roll;
}
public void setRoll(String roll) {
this.roll = roll;
}
public String getAddress() {
return address;
}
public void setAddress(String address) {
this.address = address;
}
public String getBranch() {
return branch;
}
public void setBranch(String branch) {
this.branch = branch;
}
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
}
MainActivity.java
package com.example.prabhu.databasedemo;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
EditText etName,etRoll,etAddress,etBranch,etEmail;
Button btnSubmit,btngetdata;
DatabaseHelpher helpher;
List<DatabaseModel> dbList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
dbList= new ArrayList<DatabaseModel>();
etName = (EditText)findViewById(R.id.etName);
etRoll = (EditText)findViewById(R.id.etRoll);
etAddress =(EditText)findViewById(R.id.etAddress);
etBranch = (EditText)findViewById(R.id.etBranch);
etEmail = (EditText)findViewById(R.id.etEmail);
btnSubmit =(Button)findViewById(R.id.btnSubmit);
btngetdata =(Button)findViewById(R.id.btngetdata);
btngetdata.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
startActivity(new Intent(MainActivity.this, SecondActivity.class));
// startActivity(new Intent(MainActivity.this, DetailsActivity.class));
}
});
btnSubmit.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String name=etName.getText().toString();
String email=etEmail.getText().toString();
String roll=etRoll.getText().toString();
String address=etAddress.getText().toString();
String branch=etBranch.getText().toString();
if(name.equals("") || email.equals("") || roll.equals("") ||address.equals("")||branch.equals("")){
Toast.makeText(MainActivity.this,"Please fill all the fields",Toast.LENGTH_SHORT).show();
}else {
helpher = new DatabaseHelpher(MainActivity.this);
helpher.insertIntoDB(name, email, roll, address, branch);
}
etName.setText("");
etRoll.setText("");
etAddress.setText("");
etBranch.setText("");
etEmail.setText("");
Toast.makeText(MainActivity.this, "insert value", Toast.LENGTH_SHORT);
}
});
}
}
SecondActivity.java
package com.example.prabhu.databasedemo;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import java.util.ArrayList;
import java.util.List;
public class SecondActivity extends AppCompatActivity {
DatabaseHelpher helpher;
List<DatabaseModel> dbList;
RecyclerView mRecyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_second);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
helpher = new DatabaseHelpher(this);
dbList= new ArrayList<DatabaseModel>();
dbList = helpher.getDataFromDB();
mRecyclerView = (RecyclerView)findViewById(R.id.recycleview);
mRecyclerView.setHasFixedSize(true);
// use a linear layout manager
mLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLayoutManager);
// specify an adapter (see also next example)
mAdapter = new RecyclerAdapter(this,dbList);
mRecyclerView.setAdapter(mAdapter);
}
#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_second, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
}
DetailedActivity.java
package com.example.prabhu.databasedemo;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.Toolbar;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
public class DetailsActivity extends AppCompatActivity {
DatabaseHelpher helpher;
List<DatabaseModel> dbList;
int position;
TextView tvname,tvemail,tvroll,tvaddress,tvbranch;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_details);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
Intent intent = getIntent();
Bundle bundle = intent.getExtras();
// 5. get status value from bundle
position = bundle.getInt("position");
tvname =(TextView)findViewById(R.id.name);
tvemail =(TextView)findViewById(R.id.email);
tvroll =(TextView)findViewById(R.id.roll);
tvaddress =(TextView)findViewById(R.id.address);
tvbranch =(TextView)findViewById(R.id.branch);
helpher = new DatabaseHelpher(this);
dbList= new ArrayList<DatabaseModel>();
dbList = helpher.getDataFromDB();
if(dbList.size()>0){
String name= dbList.get(position).getName();
String email=dbList.get(position).getEmail();
String roll=dbList.get(position).getRoll();
String address=dbList.get(position).getAddress();
String branch=dbList.get(position).getBranch();
tvname.setText(name);
tvemail.setText(email);
tvroll.setText(roll);
tvaddress.setText(address);
tvbranch.setText(branch);
}
Toast.makeText(DetailsActivity.this, dbList.toString(), Toast.LENGTH_SHORT);
}
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_details, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
}
I had added a button (findViewByID) in the DetailedAvtivity.java with an OnClickListener. Initially to only show a toast, however, when the button on any detailed view is clicked, nothing happens - no toast.
So really, questions are:
Where do I have to define the button and where do I implement the onClickListener?
How do I make the button delete the entry? For now I am happy to use the email from the email TextView (tvemail) but I will have to go back and refresh the cards as well.
Thanks all in advance

After some time I found the answer. What I was doing was correct but messed the toast command.
Basically what needs to be done is
delButton = (Button) findViewById(R.id.button);
delButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getApplicationContext(), tvemail.getText() + " deleted", Toast.LENGTH_SHORT).show();
startActivity(new Intent(DetailsActivity.this, MainActivity.class));
helpher.deleteARow((String) tvemail.getText());
}
});

How to add Edittext and Spinner when I clicked on Add button in java code?

package com.nyurals.school;
import android.annotation.SuppressLint;
import android.app.ActionBar;
import android.app.Activity;
import android.content.Intent;
import android.content.res.Resources;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;
public class SettingsActitivity extends Activity {
#SuppressLint("NewApi")
#Override
protected void onCreate(Bundle savedInstanceState) {
setContentView(R.layout.activity_settings );
ActionBar actionBar = getActionBar();
actionBar.show();
actionBar.setTitle("SETTINGS");
int titleId = Resources.getSystem().getIdentifier("action_bar_title", "id", "android");
TextView textView = (TextView)findViewById(titleId);
// textView.setText("ANNOUNCEMENTS");
textView.setTextColor(android.graphics.Color.BLUE);
actionBar.setDisplayHomeAsUpEnabled(true);
init();
super.onCreate(savedInstanceState);
}
private void init() {
//textParentName = (TextView) findViewById(R.)
String[] items = { "Nursery", "KG-I", "KG-II", "I", "II",
"III", "IV", "V" };
Spinner spinnerForClass = (Spinner) findViewById(R.id.spinnerClass);
// spinnerForClass.setOnItemSelectedListener(this);
ArrayAdapter<String> spinnerClass = new ArrayAdapter<String>(this,
android.R.layout.simple_spinner_item,items);
spinnerForClass.setAdapter(spinnerClass);
}
public void addChildren(View view) {
Toast.makeText(SettingsActitivity.this, "Clicked on Add", Toast.LENGTH_SHORT).show();
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = getMenuInflater();
menuInflater.inflate(R.menu.menu_settings, menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch(item.getItemId()){
case R.id.item_save:
Toast.makeText(SettingsActitivity.this, "Details saved.. Thank You!!", Toast.LENGTH_SHORT).show();
return true;
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
default:
return false;
}
}
}
In above code in add Children method, What should I write to add child again???? i.e. How to add Edit Text and Spinner like it is already present there which came from XML..
please suggest any solution...

if you have Spinner and EditText in xml already and want to add again by probgrammatically then first remove all views from your parent layout..
like:
parentlayout.removeAllViews();
and after that create object for Spinner and EditText and add to parent layout
EditText edt= new EditText(this);
Spinner sp= new Spinner(this);
parentlayout.addView(edt);
parentlayout.addView(sp);

Try this:
EditText myEdtTxt = new EditText(this);
myLayout.addView(myEdtTxt);
Spinner spinner = new Spinner(this);
myLayout.addView(spinner);

Develop Reference

Java is a programming language and computing platform first released by Sun Microsystems in 1995.

Only one row is displayed in ListView: Android - java

Most likely it sounds like you are returning only one item in your getItemCount() #Override public int getItemCount() { return list.size(); } you need to return the size of the list that you are passing in your adapter

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How to add Edittext and Spinner when I clicked on Add button in java code?

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