Good morning to all, Those who all tried RecyclerView adapter with CheckBox, you all may find the issue on dynamic data change in RecyclerView. This will help you to resolve the issue in very simple way.
Video output of this project
So how to achieve this task effectively?
Simple, I hope you all tried with list objects only. Surely this object will have the boolean variable to know whether this object is selected or not. So now while we are select one object with the help of recyclerview and scroll down and up recyclerview adapter, the checked checkbox's position may change, this reflects on our object also, So how to avaid this issue.
simple, In our recyclerview adapter's onBindViewHolder method, first set the checkedOnChangeListener of checkbox to null, and then set whether this object is selected or not to checkbox, and then add the checkedOnChangeListener to the checkbox. That's all. Issue solved.
onBindViewHolder
will be look like
@Override
public void onBindViewHolder(final ViewHolder holder, int position) {
//in some cases, it will prevent unwanted situations
holder.checkbox.setOnCheckedChangeListener(null);
//if true, your checkbox will be selected, else unselected
holder.checkbox.setChecked(numbers.get(position).isSelected());
holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
@Override
public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
numbers.get(holder.getAdapterPosition()).setSelected(isChecked);
}
});
}
here
numbers
is list of objects.
I hope this post is useful to you. kindly share your feedback as comment here.
Hi Guys, Maybe you all are expert in terms of using RecyclerView in android. This blog is simple example for using filter option with RecyclerView adapter.
As for now you will instantiate RecyclerView and set the adapter to RecyclerView as following way.
And also you will create your options menu and inflate SearchView as following way.
@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);
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
return true;
}
So by above code your activity/fragment will implement SearchView.OnQueryTextListener. So you will have onQueryTextChange method from this listener. Just change this method like following to start filtering with this adapter.
The filter method from above code will return the filtered list as following.
private List<Number> filter(List<Number> numbers, String query) {
query = query.toLowerCase();
ArrayList<Number> filteredCompanyList = new ArrayList<>();
for (Number client : numbers) {
final String textOne = client.getTextONEs().toLowerCase();
final String textTen = client.getTextTENs().toLowerCase();
final String textHundred = client.getTextHUNDREDs().toLowerCase();
final String TENs = client.getTENs();
final String ONEs = client.getONEs();
final String HUNDREDs = client.getHUNDREDs();
if (textOne.contains(query) || TENs.contains(query) || ONEs.contains(query) || HUNDREDs.contains(query) || textTen.contains(query) || textHundred.contains(query)) {
filteredCompanyList.add(client);
}
}
return filteredCompanyList;
}
And your adapter will have the following related methods to perform this filter with animation.
public void animateTo(List<Number> models) {
applyAndAnimateRemovals(models);
applyAndAnimateAdditions(models);
applyAndAnimateMovedItems(models);
}
private void applyAndAnimateRemovals(List<Number> newModels) {
for (int i = numbers.size() - 1; i >= 0; i--) {
final Number model = numbers.get(i);
if (!newModels.contains(model)) {
removeItem(i);
}
}
}
private void applyAndAnimateAdditions(List<Number> newModels) {
for (int i = 0, count = newModels.size(); i < count; i++) {
final Number model = newModels.get(i);
if (!numbers.contains(model)) {
addItem(i, model);
}
}
}
private void applyAndAnimateMovedItems(List<Number> newModels) {
for (int toPosition = newModels.size() - 1; toPosition >= 0; toPosition--) {
final Number model = newModels.get(toPosition);
final int fromPosition = numbers.indexOf(model);
if (fromPosition >= 0 && fromPosition != toPosition) {
moveItem(fromPosition, toPosition);
}
}
}
public Number removeItem(int position) {
final Number model = numbers.remove(position);
notifyItemRemoved(position);
return model;
}
public void addItem(int position, Number model) {
numbers.add(position, model);
notifyItemInserted(position);
}
public void moveItem(int fromPosition, int toPosition) {
final Number model = numbers.remove(fromPosition);
numbers.add(toPosition, model);
notifyItemMoved(fromPosition, toPosition);
}
I hope this post is useful to you. kindly share your feedback as comment here.
So as you see the above two xml, nav_view will be opened from left to right by taping menuLeft
As well, nav_view2 will be opened from right to left by taping menuRight
And your activity_main_drawer and activity_main_drawer2 will have the Navigation items which will look like as following.
You can handle these NavigationView's in code as following.
public class MainActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "You have chosen mail option", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
final DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
ImageButton menuLeft = (ImageButton) findViewById(R.id.menuLeft);
ImageButton menuRight = (ImageButton) findViewById(R.id.menuRight);
menuLeft.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else {
drawer.openDrawer(GravityCompat.START);
}
}
});
menuRight.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (drawer.isDrawerOpen(GravityCompat.END)) {
drawer.closeDrawer(GravityCompat.END);
} else {
drawer.openDrawer(GravityCompat.END);
}
}
});
NavigationView navigationView1 = (NavigationView) findViewById(R.id.nav_view);
NavigationView navigationView2 = (NavigationView) findViewById(R.id.nav_view2);
navigationView1.setNavigationItemSelectedListener(this);
navigationView2.setNavigationItemSelectedListener(this);
}
@Override
public void onBackPressed() {
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
if (drawer.isDrawerOpen(GravityCompat.START)) {
drawer.closeDrawer(GravityCompat.START);
} else if (drawer.isDrawerOpen(GravityCompat.END)) {
drawer.closeDrawer(GravityCompat.END);
} else {
super.onBackPressed();
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.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);
}
@SuppressWarnings("StatementWithEmptyBody")
@Override
public boolean onNavigationItemSelected(MenuItem item) {
// Handle navigation view item clicks here.
int id = item.getItemId();
String text = "";
if (id == R.id.nav_camera) {
text = "camera";
} else if (id == R.id.nav_gallery) {
text = "gallery";
} else if (id == R.id.nav_slideshow) {
text = "slideshow";
} else if (id == R.id.nav_manage) {
text = "tools";
} else if (id == R.id.nav_share) {
text = "share";
} else if (id == R.id.nav_send) {
text = "send";
} else if (id == R.id.nav_home) {
text = "home";
} else if (id == R.id.nav_bar) {
text = "bar";
} else if (id == R.id.nav_pool) {
text = "pool";
}
Toast.makeText(this, "You have chosen " + text, Toast.LENGTH_LONG).show();
DrawerLayout drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawer.closeDrawer(GravityCompat.START);
drawer.closeDrawer(GravityCompat.END);
return true;
}
}
I hope this post is useful to you. kindly share your feedback as comment here.
Beginning in Android 3.0, using the SearchView widget as an item in the action bar is the preferred way to provide search in your app. Like with all items in the action bar, you can define the SearchView to show at all times, only when there is room, or as a collapsible action, which displays the SearchView as an icon initially, then takes up the entire action bar as a search field when the user clicks the icon.
If you want to make it with different activity just re declare the following line result activity.
And our onCreateOptionsMenu in our activity will be
@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_search, menu);
SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);
final SearchView searchView = (SearchView) menu.findItem(R.id.search).getActionView();
// Assumes current activity is the searchable activity
ComponentName componentName = new ComponentName(getApplicationContext(), MainActivity.class);//getComponentName();
SearchableInfo info = searchManager.getSearchableInfo(componentName);
searchView.setSearchableInfo(info);
searchView.setOnSearchClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.v("App", "setOnSearchClickListener");
if (searchView.getQuery().length() == 0)
searchView.setQuery("", true);
}
});
return true;
}
private void handleIntent(Intent intent) {
if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
String query = intent.getStringExtra(SearchManager.QUERY);
//use the query to search your data somehow
Log.v("App", query);
}
}
I hope this post is useful to you. kindly share your feedback as comment here.
Hi guys, It's been a longtime, herewith I came up with a RecyclerView example, I hope you enjoy this blog too.
RecyclerView is just an advance for ListView. Hereafter you can use RecyclerView instead of ListView. RecyclerView can do all works performed by ListView. And also RecyclerView is more flexible with large data set. In this blog you can learn how to create a simple RecyclerView and also adapter for this RecyclerView.
You can create RecyclerView by using appcompat-v7 support jar.
Code:
MainActivity.java
import android.support.annotation.Nullable;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v4.app.Fragment;
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 java.util.ArrayList;
import java.util.List;
public class MainActivity extends ActionBarActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
}
@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);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
RecyclerViewAdapter adapter;
RecyclerView recyclerView;
private static List<Model> demoData;
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_main, container, false);
}
@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
recyclerView = (RecyclerView) getView().findViewById(R.id.myList);
recyclerView.setHasFixedSize(true);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(llm);
demoData = new ArrayList<Model>();
char c = 'A';
for (byte i = 0; i < 20; i++) {
Model model = new Model();
model.name = c++;
model.age = (byte) (20 + i);
demoData.add(model);
}
adapter = new RecyclerViewAdapter(demoData);
recyclerView.setAdapter(adapter);
}
}
}
RecyclerViewAdapter.java
import android.support.v7.widget.RecyclerView;
import android.util.SparseBooleanArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.List;
public class RecyclerViewAdapter
extends RecyclerView.Adapter
<RecyclerViewAdapter.ListItemViewHolder> {
private List<Model> items;
private SparseBooleanArray selectedItems;
RecyclerViewAdapter(List<Model> modelData) {
if (modelData == null) {
throw new IllegalArgumentException("modelData must not be null");
}
items = modelData;
selectedItems = new SparseBooleanArray();
}
@Override
public ListItemViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View itemView = LayoutInflater.
from(viewGroup.getContext()).
inflate(R.layout.item_demo_01, viewGroup, false);
return new ListItemViewHolder(itemView);
}
@Override
public void onBindViewHolder(ListItemViewHolder viewHolder, int position) {
Model model = items.get(position);
viewHolder.name.setText(String.valueOf(model.name));
viewHolder.age.setText(String.valueOf(model.age));
viewHolder.itemView.setActivated(selectedItems.get(position, false));
}
@Override
public int getItemCount() {
return items.size();
}
public final static class ListItemViewHolder extends RecyclerView.ViewHolder {
TextView name;
TextView age;
public ListItemViewHolder(View itemView) {
super(itemView);
name = (TextView) itemView.findViewById(R.id.txt_name);
age = (TextView) itemView.findViewById(R.id.txt_age);
}
}
}
