Save typed email and use it in a textview? [closed]

I imagine you want to open another activity and display in a TextView, the typed email on the login screen.

If it is only for display and use as proof of concept, you can do it as follows:

LoginActivity.class

String txt = editText.getText().toString();
Intent intent = new Intent(LoginActivity.this, MainActivity.class); 
intent.putExtra("login", txt);     
startActivity(intent);           

MainActivity.class

TextView txtEmail = (TextView) findViewById(R.id.tvEmail);
Bundle b = getIntent().getExtras();
if(b!=null){
    String email = b.getString("login");
    txtEmail.setText(email);
}

But I advise you to create a local base, so that you do not have a problem on display, if you continue with a navigation on other screens and have to return to MainActivity, for example.

I hope I have helped.

A simple way to persist data is to use SharedPreference as shown in the documentation on How to save key-value sets . See below for an example of how to save, assuming you have a EditText variable named name myEditText :

SharedPreferences sharedpreferences = getSharedPreferences("pref", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedpreferences.edit();
editor.putString("str_email", myEditText.getText().toString());
editor.commit();

To redeem:

SharedPreferences pref = getSharedPreferences("pref", MODE_PRIVATE);
String email = pref.getString("str_email", null);
myEditText.setText(email);

See Save Value on SharedPreference for more details.

In this way, at any time of your application, you can regroup the value that was saved in a given key. See here at Persistence levels of data in Android applications other approaches.