Full source code to implement a search functionality for our RecyclerView so we can filter it’s items by their text. For this we will use an EditText, the setTextChangedListener method, a TextWatcher and the afterTextChanged method
activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.codinginflow.searchfunctionalityexample.MainActivity">
<EditText
android:id="@+id/edittext"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="16dp"/>
<android.support.v7.widget.RecyclerView
android:id="@+id/recyclerView"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@android:color/darker_gray"
android:padding="4dp"
android:scrollbars="vertical" />
</LinearLayout>
example_item.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
app:cardCornerRadius="4dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_margin="4dp">
<ImageView
android:id="@+id/imageView"
android:layout_width="50dp"
android:layout_height="50dp"
android:padding="2dp" />
<TextView
android:id="@+id/textView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentTop="true"
android:layout_toEndOf="@+id/imageView"
android:text="Line 1"
android:textColor="@android:color/black"
android:textSize="20sp"
android:textStyle="bold" />
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@+id/textView"
android:layout_marginStart="8dp"
android:layout_toEndOf="@+id/imageView"
android:text="Line 2"
android:textSize="15sp" />
</RelativeLayout>
</android.support.v7.widget.CardView>
ExampleAdapter.java
package com.codinginflow.searchfunctionalityexample;
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.ArrayList;
public class ExampleAdapter extends RecyclerView.Adapter<ExampleAdapter.ExampleViewHolder> {
private ArrayList<ExampleItem> mExampleList;
public static class ExampleViewHolder extends RecyclerView.ViewHolder {
public ImageView mImageView;
public TextView mTextView1;
public TextView mTextView2;
public ExampleViewHolder(View itemView) {
super(itemView);
mImageView = itemView.findViewById(R.id.imageView);
mTextView1 = itemView.findViewById(R.id.textView);
mTextView2 = itemView.findViewById(R.id.textView2);
}
}
public ExampleAdapter(ArrayList<ExampleItem> exampleList) {
mExampleList = exampleList;
}
@Override
public ExampleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.example_item,
parent, false);
ExampleViewHolder evh = new ExampleViewHolder(v);
return evh;
}
@Override
public void onBindViewHolder(ExampleViewHolder holder, int position) {
ExampleItem currentItem = mExampleList.get(position);
holder.mImageView.setImageResource(currentItem.getImageResource());
holder.mTextView1.setText(currentItem.getText1());
holder.mTextView2.setText(currentItem.getText2());
}
@Override
public int getItemCount() {
return mExampleList.size();
}
public void filterList(ArrayList<ExampleItem> filteredList) {
mExampleList = filteredList;
notifyDataSetChanged();
}
}
ExampleItem.java
package com.codinginflow.searchfunctionalityexample;
public class ExampleItem {
private int mImageResource;
private String mText1;
private String mText2;
public ExampleItem(int imageResource, String text1, String text2) {
mImageResource = imageResource;
mText1 = text1;
mText2 = text2;
}
public int getImageResource() {
return mImageResource;
}
public String getText1() {
return mText1;
}
public String getText2() {
return mText2;
}
}
MainActivity.java
package com.codinginflow.searchfunctionalityexample;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import java.util.ArrayList;
public class MainActivity extends AppCompatActivity {
private ArrayList<ExampleItem> mExampleList;
private RecyclerView mRecyclerView;
private ExampleAdapter mAdapter;
private RecyclerView.LayoutManager mLayoutManager;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
createExampleList();
buildRecyclerView();
EditText editText = findViewById(R.id.edittext);
editText.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
}
@Override
public void afterTextChanged(Editable s) {
filter(s.toString());
}
});
}
private void filter(String text) {
ArrayList<ExampleItem> filteredList = new ArrayList<>();
for (ExampleItem item : mExampleList) {
if (item.getText1().toLowerCase().contains(text.toLowerCase())) {
filteredList.add(item);
}
}
mAdapter.filterList(filteredList);
}
private void createExampleList() {
mExampleList = new ArrayList<>();
mExampleList.add(new ExampleItem(R.drawable.ic_android, "One", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_audio, "Two", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_sun, "Three", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_android, "Four", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_audio, "Five", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_sun, "Six", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_android, "Seven", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_audio, "Eight", "Line 2"));
mExampleList.add(new ExampleItem(R.drawable.ic_sun, "Nine", "Line 2"));
}
private void buildRecyclerView() {
mRecyclerView = findViewById(R.id.recyclerView);
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager(this);
mAdapter = new ExampleAdapter(mExampleList);
mRecyclerView.setLayoutManager(mLayoutManager);
mRecyclerView.setAdapter(mAdapter);
}
}