MainActivity.java

package com.example.tmp;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    private Button btn;
    private TextView textInput;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        btn = findViewById(R.id.button);
        btn.setOnClickListener(this);
        textInput = findViewById(R.id.textInput);
        Log.i("Activity 1", "Démarrage");
    }

    @Override
    public void onClick(View v) {
        if(v.getId() == btn.getId()){
            Intent intent = new Intent(this, MainActivity2.class);
            intent.putExtra("text", textInput.getText().toString());
            startActivity(intent);
        }
    }
}