Transfer the variable from one activate to another

[emran]

There's a first class in which there's a variable nameUser.

There's a second class in which there's also a variable nameUser.

From the first class, the nameUser change meaning should be transferred to the variable nameUser of the second class.

How do I do it?

First Class

  import android.support.v7.app.AppCompatActivity;
  import android.os.Bundle;
  import android.widget.TextView;
public class HealthScreen extends AppCompatActivity{
TextView textView;
String NameUser;
@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_health_screen);
textView = (TextView) findViewById(R.id.textView3);

MainActivity mainActivity = new MainActivity();

NameUser = mainActivity.NameUser;

textView.setText(NameUser);

}

♪

Second Class

public class MainActivity extends AppCompatActivity {

TextView WelcomeAlpha;

Button OK;

Button OK1;
ImageView line1;
TextView FIO;

TextView text_Weigth;

EditText NameEdit;

EditText WeigthEdit;
Animation animation;

Animation animation1;

Animation animation2;
String NameUser;

String WeightUser;
int timer = 0;
@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);
animation = AnimationUtils.loadAnimation(this, R.anim.fadein);
animation1 = AnimationUtils.loadAnimation(this, R.anim.fadeout);
animation2 = AnimationUtils.loadAnimation(this, R.anim.fadenow);

line1 = (ImageView) findViewById(R.id.line);

WelcomeAlpha = (TextView) findViewById(R.id.welcome_text_view);
OK = (Button) findViewById(R.id.ok_button);
OK1 = (Button) findViewById(R.id.ok_button_2);

FIO = (TextView) findViewById(R.id.FIO);
text_Weigth = (TextView) findViewById(R.id.textView2);
NameEdit = (EditText) findViewById(R.id.editText);
WeigthEdit = (EditText) findViewById(R.id.editText2);

WelcomeAlpha.startAnimation(animation);
line1.setVisibility(View.INVISIBLE);
NameEdit.setVisibility(View.INVISIBLE);
WeigthEdit.setVisibility(View.INVISIBLE);
OK.setVisibility(View.INVISIBLE);
OK1.setVisibility(View.INVISIBLE);
FIO.startAnimation(animation2);
text_Weigth.startAnimation(animation2);
WeigthEdit.startAnimation(animation2);
NameEdit.startAnimation(animation2);


View.OnClickListener onClickListener = new View.OnClickListener() {
    @Override
    public void onClick(View v) {


        WelcomeAlpha.setVisibility(View.INVISIBLE);
        OK.setVisibility(View.VISIBLE);
        NameEdit.setVisibility(View.VISIBLE);
        NameEdit.startAnimation(animation);
        OK.startAnimation(animation);
        FIO.startAnimation(animation);

    }
};
WelcomeAlpha.setOnClickListener(onClickListener);
View.OnClickListener onClickListener1 = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        NameUser = NameEdit.getText().toString();
        line1.setVisibility(View.VISIBLE);
        line1.startAnimation(animation);
        OK1.setVisibility(View.VISIBLE);
        OK.setVisibility(View.INVISIBLE);
        WeigthEdit.setVisibility(View.VISIBLE);
        WeigthEdit.startAnimation(animation);
        OK1.startAnimation(animation);
        text_Weigth.startAnimation(animation);

    }
};
OK.setOnClickListener(onClickListener1);

View.OnClickListener onClickListener2 = new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        WeightUser = WeigthEdit.getText().toString();
        NameEdit.startAnimation(animation1);
        WeigthEdit.startAnimation(animation1);
        OK1.startAnimation(animation1);
        WeigthEdit.setVisibility(View.INVISIBLE);
        NameEdit.setVisibility(View.INVISIBLE);
        OK1.setVisibility(View.INVISIBLE);
        OK1.setClickable(false);

        NameEdit.setActivated(false);
        WeigthEdit.setActivated(false);
        line1.startAnimation(animation1);
        text_Weigth.startAnimation(animation1);
        FIO.startAnimation(animation1);
        GoToHealth();
    }
};
OK1.setOnClickListener(onClickListener2);

}

void GoToHealth()

{

Intent intent = new Intent(MainActivity.this, HealthScreen.class);

startActivity(intent);

this.finish();

}

}

[Marcee]

1. Make a public method public string getUserName()that will return userName (sighs)return userName;and call it in another method:

   ClassWithVariable instance=new ClassWithVariable(); //создаете экземпляр класса
   String name = instance.getUserName(); //получаете переменную.
   

2. Make a public method in a class where the variable is to be transferred, which accepts it as an argument:

   class MyClass {
       public void method(String userName); 
   }
   class ClassWithVariable {
   
   private string userName = "Ivan";
   MyClass instance = new MyClass();
   instance.method(userName);
   
   }