Tukukkk

I want to get a string value from one activity to another. When I code and then run it doesn't show any error message in compiler or somewhere, but when priview when I click the button it come back to the HOME SCREEN of the Phone not the app.

These are the codes.

Main Activity

public void submit(View view){



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

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

    String display = textView.getText().toString();

    intent.putExtra("MESSAGE",display);

    startActivity(intent);



}

Message Activity(Second Activity)

public class MessageActivity extends AppCompatActivity {



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_message);



        Intent intent = getIntent();

        String message = intent.getStringExtra("MESSAGE");



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

        textView.setText(message);

    }



    public void back(View view){

        Intent intent2 = new Intent(this,MainActivity.class);

        startActivity(intent2);

   }

}

Your code works fine for me... Here is my snippets

public void submit(View view) {



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

    String display = textView.getText().toString();

    if (!TextUtils.isEmpty(display)) {

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

        intent.putExtra("MESSAGE", display);

        startActivity(intent);

    }

}

In the second class:

    {

        String message = getIntent().getStringExtra("MESSAGE");

        System.out.println("message = " + message);

    }

Since you are asking that
"when I click the button it come back to the HOME SCREEN of the Phone not the app",

cross check is there any finish() is called in your first activity.