Passing data through Intent Android

Question

I'm currently trying to program an app which requires the user to key in their name. This is the "Login" page.

public class Login extends Activity {

EditText username;

@Override
public void onCreate(Bundle savedInstanceState)
{
    username = (EditText)findViewById(R.id.username);

    super.onCreate(savedInstanceState);
    setContentView(R.layout.login);

    Button loginButton = (Button) findViewById(R.id.loginBtn);

    loginButton.setOnClickListener(new View.OnClickListener(){
        public void onClick(View v){
            Intent intent = new Intent("com.example.MainActivity");

            Bundle extras = new Bundle();
            extras.putString("name", username.getText().toString());
            intent.putExtras(extras);

            startActivity(intent);
        }
    });

}

protected void onDestroy() {        
    super.onDestroy();
}

protected void onPause() {
    super.onPause();
    saveAsPreferences();
}

protected void onRestart() {
    super.onRestart();
    saveAsPreferences();
}

protected void onResume() {
    super.onResume();
    retrievePreferences();
}

protected void onStart() {
    super.onStart();
    retrievePreferences();
}

protected void onStop() {
    super.onStop();
    saveAsPreferences();
}
public void saveAsPreferences() 
{
    SharedPreferences prefs = getSharedPreferences("preferences", MODE_PRIVATE);
    String Name = username.getText().toString();
    SharedPreferences.Editor editor = prefs.edit();
    editor.putString("name", Name);
    editor.commit();
}
public void retrievePreferences()
{
    SharedPreferences prefs = getSharedPreferences("preferences",MODE_PRIVATE);
    if(prefs.contains("name"))
    {
        String Name = prefs.getString("name", "");
        username.setText(Name);
    }
}

}

and this is my Result page

public class MainActivity extends Activity {

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    Bundle bundle = getIntent().getExtras();
    String Name = bundle.getString("name");
    TextView welcomeUser = (TextView) findViewById(R.id.welcomeUser);
    welcomeUser.setText("Hello " + Name + "!");

}

why isn't my codes working? Thanks! Note: I've linked the pages correctly before I start on passing data.

score 1 · Answer 1 · answered Jul 27 '14 at 13:59

1

You should change the order like in your Login Activity

setContentView(R.layout.login);
username = (EditText)findViewById(R.id.username);

First you need to setContentView(..) then reference Views.

answered Jul 27 '14 at 13:59

M D

47,665
9
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what do you mean by Views? – user3774763 Jul 27 '14 at 14:04
@user3774763 Your **EditText**, **TextView** and so on... it's just kind of **Views**. – M D Jul 27 '14 at 14:05
you mean import? i did import, just that i didnt show that part – user3774763 Jul 27 '14 at 14:13

score 0 · Answer 2 · answered Jul 27 '14 at 15:20

0

do in this way . in your login class don't use Bundle . use intent.putExtra("name",username); and then in your main activity class . getIntent().getStringExtra("name"); this will return the username and define your Edittext aftert setContentView

answered Jul 27 '14 at 15:20

Vahe Muradyan

1,115
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intent.putExtra is invalid argument due to cause username is in EditText, it is also invalid for username.getText().ToString() cause both are strings – user3774763 Jul 27 '14 at 15:47
1

it cant be wrong argument because intent.putExtra has 2 string arguments first "name" second username.getText().toString() – Vahe Muradyan Jul 27 '14 at 16:11
The method putExtras(Intent) in the type Intent is not applicable for the arguments (String, String) that's the error – user3774763 Jul 27 '14 at 16:15

Passing data through Intent Android

2 Answers2