package com.example.myfirstapp;

​

import static android.provider.AlarmClock.EXTRA_MESSAGE;

​

​

public class MainActivity extends AppCompatActivity {

    public static final String EXTRA_MESSAGE = "com.example.myfirstapp.MESSAGE";

    @Override

    protected void onCreate(Bundle savedInstanceState) {

​

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

​

​

        // Get the Intent that started this activity and extract the string

        Intent intent = getIntent();

        String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);

​

        // Capture the layout's TextView and set the string as its text

        TextView textView = findViewById(R.id.textView);

        textView.setText(message);

​

    }

    /** Called when the user taps the Send button */

    public void sendMessage(View view) {

        Intent intent = new Intent(this, DisplayMessageActivity.class);

        EditText editText = (EditText) findViewById(R.id.editTextTextPersonName);

        String message = editText.getText().toString();

        intent.putExtra(EXTRA_MESSAGE, message);

        startActivity(intent);

    }

}

​

package com.example.myfirstapp;

​

import androidx.appcompat.app.AppCompatActivity;

​

import android.content.Intent;

import android.os.Bundle;

import android.widget.TextView;

​

public class DisplayMessageActivity extends AppCompatActivity {

​

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_display_message);

​

        // Get the Intent that started this activity and extract the string

        Intent intent = getIntent();

        String message = intent.getStringExtra(MainActivity.EXTRA_MESSAGE);

​

        // Capture the layout's TextView and set the string as its text

        TextView textView = findViewById(R.id.textView);

        textView.setText(message);

    }

}