java

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

    private Button btn;
    private EditText et;

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

        btn = findViewById(R.id.btn);
        et = findViewById(R.id.et);

        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                sendData();
            }
        });
    }

    private void sendData() {

        String name = et.getText().toString().trim();

        Intent intent = new Intent(MainActivity.this,SecondActivity.class);
        intent.putExtra("name",name);
        startActivity(intent);

    }
}