How to use search functionality in custom list view in Android

Question

I have created a list view with multiple items in row. I have also created a search box above. I want to implement search functionality on the basis of particular fields of the list. How can I achieve this? Any help will be appreciated.

Answer 1

You have to use model, listview, and customadapter with filtering for this. I have created a demo for this.

Suppose you have a model named Product, and you are displaying its content in a custom listview where name and price are displayed in a textview. I mean in a custom row having two textviews, and you want to filter the list by one of the field of custom row. Here I have filtered with "name"

Screenshots:

Initial

Filtered

Source code

Model

public class Product {      public String name;     public Integer price;     public Product(String name, Integer price) {         super();         this.name = name;         this.price = price;     }     public String getName() {         return name;     }     public void setName(String name) {         this.name = name;     }     public Integer getPrice() {         return price;     }     public void setPrice(Integer price) {         this.price = price;     } } 

Activity with custom adapter and listview

public class MainActivity extends Activity {     private LinearLayout llContainer;     private EditText etSearch;     private ListView lvProducts;      private ArrayList<Product> mProductArrayList = new ArrayList<Product>();     private MyAdapter adapter1;       @Override     public void onCreate(Bundle savedInstanceState) {         super.onCreate(savedInstanceState);         setContentView(R.layout.activity_main);           initialize();            // Add Text Change Listener to EditText         etSearch.addTextChangedListener(new TextWatcher() {              @Override             public void onTextChanged(CharSequence s, int start, int before, int count) {                 // Call back the Adapter with current character to Filter                 adapter1.getFilter().filter(s.toString());             }              @Override             public void beforeTextChanged(CharSequence s, int start, int count,int after) {             }              @Override             public void afterTextChanged(Editable s) {             }         });     }      private void initialize() {         etSearch = (EditText) findViewById(R.id.etSearch);         lvProducts = (ListView)findViewById(R.id.lvOS);     }      @Override     protected void onResume() {         // TODO Auto-generated method stub         super.onResume();          mProductArrayList.add(new Product("a", 100));         mProductArrayList.add(new Product("b", 200));         mProductArrayList.add(new Product("c", 300));         mProductArrayList.add(new Product("d", 400));         mProductArrayList.add(new Product("e", 500));         mProductArrayList.add(new Product("f", 600));         mProductArrayList.add(new Product("g", 700));         mProductArrayList.add(new Product("h", 800));         mProductArrayList.add(new Product("i", 900));         mProductArrayList.add(new Product("j", 1000));         mProductArrayList.add(new Product("k", 1100));         mProductArrayList.add(new Product("l", 1200));         mProductArrayList.add(new Product("m", 1000));         mProductArrayList.add(new Product("n", 1300));         mProductArrayList.add(new Product("o", 1400));         mProductArrayList.add(new Product("p", 1500));           adapter1 = new MyAdapter(MainActivity.this, mProductArrayList);         lvProducts.setAdapter(adapter1);     }       // Adapter Class                 public class MyAdapter extends BaseAdapter implements Filterable {          private ArrayList<Product> mOriginalValues; // Original Values         private ArrayList<Product> mDisplayedValues;    // Values to be displayed         LayoutInflater inflater;          public MyAdapter(Context context, ArrayList<Product> mProductArrayList) {             this.mOriginalValues = mProductArrayList;             this.mDisplayedValues = mProductArrayList;             inflater = LayoutInflater.from(context);         }          @Override         public int getCount() {             return mDisplayedValues.size();         }          @Override         public Object getItem(int position) {             return position;         }          @Override         public long getItemId(int position) {             return position;         }          private class ViewHolder {             LinearLayout llContainer;             TextView tvName,tvPrice;         }          @Override         public View getView(final int position, View convertView, ViewGroup parent) {              ViewHolder holder = null;              if (convertView == null) {                  holder = new ViewHolder();                 convertView = inflater.inflate(R.layout.row, null);                 holder.llContainer = (LinearLayout)convertView.findViewById(R.id.llContainer);                 holder.tvName = (TextView) convertView.findViewById(R.id.tvName);                 holder.tvPrice = (TextView) convertView.findViewById(R.id.tvPrice);                 convertView.setTag(holder);             } else {                 holder = (ViewHolder) convertView.getTag();             }             holder.tvName.setText(mDisplayedValues.get(position).name);             holder.tvPrice.setText(mDisplayedValues.get(position).price+"");              holder.llContainer.setOnClickListener(new OnClickListener() {                  public void onClick(View v) {                      Toast.makeText(MainActivity.this, mDisplayedValues.get(position).name, Toast.LENGTH_SHORT).show();                 }             });              return convertView;         }          @Override         public Filter getFilter() {             Filter filter = new Filter() {                  @SuppressWarnings("unchecked")                 @Override                 protected void publishResults(CharSequence constraint,FilterResults results) {                      mDisplayedValues = (ArrayList<Product>) results.values; // has the filtered values                     notifyDataSetChanged();  // notifies the data with new filtered values                 }                  @Override                 protected FilterResults performFiltering(CharSequence constraint) {                     FilterResults results = new FilterResults();        // Holds the results of a filtering operation in values                     ArrayList<Product> FilteredArrList = new ArrayList<Product>();                      if (mOriginalValues == null) {                         mOriginalValues = new ArrayList<Product>(mDisplayedValues); // saves the original data in mOriginalValues                     }                      /********                      *                       *  If constraint(CharSequence that is received) is null returns the mOriginalValues(Original) values                      *  else does the Filtering and returns FilteredArrList(Filtered)                        *                      ********/                     if (constraint == null || constraint.length() == 0) {                          // set the Original result to return                           results.count = mOriginalValues.size();                         results.values = mOriginalValues;                     } else {                         constraint = constraint.toString().toLowerCase();                         for (int i = 0; i < mOriginalValues.size(); i++) {                             String data = mOriginalValues.get(i).name;                             if (data.toLowerCase().startsWith(constraint.toString())) {                                 FilteredArrList.add(new Product(mOriginalValues.get(i).name,mOriginalValues.get(i).price));                             }                         }                         // set the Filtered result to return                         results.count = FilteredArrList.size();                         results.values = FilteredArrList;                     }                     return results;                 }             };             return filter;         }     } } 

activity_main.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:layout_width="fill_parent"     android:layout_height="fill_parent"     android:orientation="vertical" >      <EditText          android:id="@+id/etSearch"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         />     <ListView          android:id="@+id/lvProducts"         android:layout_width="fill_parent"         android:layout_height="wrap_content"         ></ListView>      </LinearLayout> 

row.xml

<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"     android:id="@+id/llContainer"     android:layout_width="match_parent"     android:layout_height="match_parent"     android:orientation="horizontal" >       <TextView          android:id="@+id/tvName"         android:layout_width="0dp"         android:layout_height="wrap_content"         android:singleLine="true"         android:layout_weight="1"         />     <TextView          android:id="@+id/tvPrice"         android:layout_width="0dp"         android:layout_height="wrap_content"         android:singleLine="true"         android:layout_weight="1"         />  </LinearLayout> 

Answer 2

Implement filterable in your customadapter class.

public class MainActivity extends AppCompatActivity {  String names[] = {"Apple","Banana","Kiwi","Oranges","Watermelon"}; String emails[] = {"This is apple","This is banana","This is kiwi","This is oranges","This is watermelon"}; int images[] = {R.drawable.apple,R.drawable.banana,R.drawable.kiwi,R.drawable.oranges,R.drawable.watermelon};  List<ItemsModel> itemsModelList = new ArrayList<>();  ListView listView;  CustomAdapter customAdapter;  @Override protected void onCreate(Bundle savedInstanceState) {     super.onCreate(savedInstanceState);     setContentView(R.layout.activity_main);      listView = findViewById(R.id.listview);       for(int i = 0;i < names.length;i++){          ItemsModel itemsModel = new ItemsModel(names[i],emails[i],images[i]);          itemsModelList.add(itemsModel);      }       customAdapter = new CustomAdapter(itemsModelList,this);      listView.setAdapter(customAdapter);   }   @Override public boolean onCreateOptionsMenu(Menu menu) {       getMenuInflater().inflate(R.menu.search_menu,menu);      MenuItem menuItem = menu.findItem(R.id.searchView);      SearchView searchView = (SearchView) menuItem.getActionView();      searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {         @Override         public boolean onQueryTextSubmit(String query) {             return false;         }          @Override         public boolean onQueryTextChange(String newText) {              Log.e("Main"," data search"+newText);              customAdapter.getFilter().filter(newText);                return true;         }     });       return true;  }   @Override public boolean onOptionsItemSelected(@NonNull MenuItem item) {      int id = item.getItemId();       if(id == R.id.searchView){          return true;     }     return super.onOptionsItemSelected(item); }   public class CustomAdapter extends BaseAdapter implements Filterable {      private List<ItemsModel> itemsModelsl;     private List<ItemsModel> itemsModelListFiltered;     private Context context;      public CustomAdapter(List<ItemsModel> itemsModelsl, Context context) {         this.itemsModelsl = itemsModelsl;         this.itemsModelListFiltered = itemsModelsl;         this.context = context;     }        @Override     public int getCount() {         return itemsModelListFiltered.size();     }      @Override     public Object getItem(int position) {         return itemsModelListFiltered.get(position);     }      @Override     public long getItemId(int position) {         return position;     }      @Override     public View getView(final int position, View convertView, ViewGroup parent) {         View view = getLayoutInflater().inflate(R.layout.row_items,null);           TextView names = view.findViewById(R.id.name);         TextView emails = view.findViewById(R.id.email);         ImageView imageView = view.findViewById(R.id.images);          names.setText(itemsModelListFiltered.get(position).getName());         emails.setText(itemsModelListFiltered.get(position).getEmail());         imageView.setImageResource(itemsModelListFiltered.get(position).getImages());          view.setOnClickListener(new View.OnClickListener() {             @Override             public void onClick(View v) {                 Log.e("main activity","item clicked");                 startActivity(new Intent(MainActivity.this,ItemsPreviewActivity.class).putExtra("items",itemsModelListFiltered.get(position)));              }         });          return view;     }        @Override     public Filter getFilter() {         Filter filter = new Filter() {             @Override             protected FilterResults performFiltering(CharSequence constraint) {                  FilterResults filterResults = new FilterResults();                 if(constraint == null || constraint.length() == 0){                     filterResults.count = itemsModelsl.size();                     filterResults.values = itemsModelsl;                  }else{                     List<ItemsModel> resultsModel = new ArrayList<>();                     String searchStr = constraint.toString().toLowerCase();                      for(ItemsModel itemsModel:itemsModelsl){                         if(itemsModel.getName().contains(searchStr) || itemsModel.getEmail().contains(searchStr)){                             resultsModel.add(itemsModel);                          }                          filterResults.count = resultsModel.size();                             filterResults.values = resultsModel;                     }                   }                  return filterResults;             }              @Override             protected void publishResults(CharSequence constraint, FilterResults results) {                  itemsModelListFiltered = (List<ItemsModel>) results.values;                 notifyDataSetChanged();              }         };         return filter;     } } 

}

full tutorial can be found here: listview with search and onItemClickListner