searchable activity android example:

 custom searchview in toolbar android :

Step-1: Search Activity .Xml:

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    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"
    tools:context=".BuyerActivity.SearchActivity">
    <androidx.cardview.widget.CardView
        android:id="@+id/card"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:elevation="3dp"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">
        <androidx.appcompat.widget.Toolbar
            android:id="@+id/toolbar2"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:theme="?attr/actionBarTheme"
            app:contentInsetStart="0dp"
            app:layout_scrollFlags="scroll|enterAlways"
            android:contentInsetStart="0dp"
            app:contentInsetStartWithNavigation="0dp"
            app:layout_constraintEnd_toEndOf="parent"
            app:layout_constraintStart_toStartOf="parent"
            app:layout_constraintTop_toTopOf="parent">

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:orientation="horizontal">

                <ImageView
                    android:id="@+id/search_icon"
                    android:layout_width="24dp"
                    android:layout_marginLeft="16dp"
                    android:layout_height="match_parent"
                    android:src="@drawable/search">

                </ImageView>

                <androidx.appcompat.widget.SearchView
                    android:id="@+id/search_view"
                    android:layout_width="match_parent"
                    android:layout_height="match_parent"
                    android:layout_weight="1"
                    app:defaultQueryHint=" Search Blog...."
                    app:iconifiedByDefault="false"
                    app:searchIcon="@null"

                    >

                </androidx.appcompat.widget.SearchView>

                <ImageView
                    android:id="@+id/mic_icon"
                    android:layout_width="24dp"
                    android:layout_marginRight="16dp"
                    android:layout_height="match_parent"
                    android:src="@drawable/mic">

                </ImageView>

            </LinearLayout>

        </androidx.appcompat.widget.Toolbar>

    </androidx.cardview.widget.CardView>

    <TextView
        android:id="@+id/textview"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="36dp"
        android:layout_marginEnd="8dp"
        android:visibility="gone"
        android:text="Product not found"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toBottomOf="@+id/card" />

</androidx.constraintlayout.widget.ConstraintLayout>

Step-2 : Search Activity.java code :

public class BlogSearchActivity extends BaseActivity {


    private TextView textView;
    private ImageView searchIcon;

    public static SearchView searchView;
    private ImageView micBtn;
    public static final Integer RecordAudioRequestCode = 1;




    private final int REQ_CODE_SPEECH_INPUT = 100;



    @SuppressLint("ClickableViewAccessibility")
    @Override
    protected void initViews() {

        searchView = findViewById(R.id.search_view);
        textView = findViewById(R.id.textview);
        searchIcon = findViewById(R.id.search_icon);
        micBtn = findViewById(R.id.mic_icon);




        SearchManager searchManager = (SearchManager) getSystemService(Context.SEARCH_SERVICE);

        searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));

        searchView.onActionViewExpanded();

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String query) {

                toHideKeyboard();

                Search(query);

                return false;
            }

            @Override
            public boolean onQueryTextChange(String newText) {

                if(newText.equals("")){
                    micBtn.setVisibility(View.VISIBLE);
                    searchIcon.setVisibility(View.VISIBLE);
                    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar2);
                    setSupportActionBar(toolbar);
                    getSupportActionBar().setDisplayHomeAsUpEnabled(false);
                    getSupportActionBar().setDisplayShowHomeEnabled(false);
                    searchView.setPadding(0,0,0,0);

                }else {
                    searchView.setPadding(-16,0,0,0);
                    searchIcon.setVisibility(View.GONE);
                    micBtn.setVisibility(View.GONE);
                    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar2);
                    setSupportActionBar(toolbar);
                    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
                    getSupportActionBar().setDisplayShowHomeEnabled(true);

                }
                return false;
            }

        });



        ImageView clearButton = searchView.findViewById(androidx.appcompat.R.id.search_close_btn);
        clearButton.setOnClickListener(v -> {

            if(searchView.getQuery().length() == 0) {
                searchView.setIconified(true);
            } else {

                // Do your task here
                searchView.setQuery("", false);
            }
        });

        micBtn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {

                if(ContextCompat.checkSelfPermission(currentActivity,
                        Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED){
                    checkPermission();
                }else {
                    Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
                    intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                            RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
                    intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
                    intent.putExtra(RecognizerIntent.EXTRA_PROMPT,
                            getString(R.string.speech_prompt));
                    try {
                        startActivityForResult(intent, REQ_CODE_SPEECH_INPUT);
                    } catch (ActivityNotFoundException a) {
                        Toast.makeText(getApplicationContext(),
                                getString(R.string.speech_not_supported),
                                Toast.LENGTH_SHORT).show();
                    }
                }


            }
        });


    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        if (Intent.ACTION_SEARCH.equals(intent.getAction())) {
            String query = intent.getStringExtra(SearchManager.QUERY);

            searchView.setQuery(query, false);
        }
    }


    private void Search(String query) {

            Intent intent = new Intent(BlogSearchActivity.this,
paas Activity which is appear after search .class);
            intent.putExtra("query",query);
            startActivity(intent);

    }

    @Override
    protected void initContext() {
        context = BlogSearchActivity.this;
        currentActivity = BlogSearchActivity.this;
    }

    @Override
    protected void initListners() {

    }

    @Override
    protected boolean isActionBar() {
        return true;
    }

    @Override
    protected boolean isHomeButton() {
        return true;
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_search_blog);


    }

    @Override
    public void onClick(View view) {

    }

    @Override
    public void onAlertClicked(int alertType) {

    }




    @Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);

        switch (requestCode) {
            case REQ_CODE_SPEECH_INPUT: {
                if (resultCode == RESULT_OK && null != data) {

                    ArrayList<String> result = data
                            .getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
                    searchView.setQuery(result.get(0),false);
                }
                break;
            }

        }
    }

    private void checkPermission() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
            ActivityCompat.requestPermissions(this,new String[]{Manifest.permission.RECORD_AUDIO},RecordAudioRequestCode);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == RecordAudioRequestCode && grantResults.length > 0 ){
            if(grantResults[0] == PackageManager.PERMISSION_GRANTED){
                //Toast.makeText(this,"Permission Granted",Toast.LENGTH_SHORT).show();
                Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
                intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
                        RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
                intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE, Locale.getDefault());
                intent.putExtra(RecognizerIntent.EXTRA_PROMPT,
                        getString(R.string.speech_prompt));
                try {
                    startActivityForResult(intent, REQ_CODE_SPEECH_INPUT);
                } catch (ActivityNotFoundException a) {
                    Toast.makeText(getApplicationContext(),
                            getString(R.string.speech_not_supported),
                            Toast.LENGTH_SHORT).show();
                }
            }

        }
    }


}