sharedpreferences from LoginActivity to MainActivity

Question

I want to save a value from my LoginActivity and Provide that to my MainActivity, but currently Log.d does not Show anything. I tried using shared preferences.

My LoginActivity:

// I want to save email to mainactivity
SharedPreferences webrtcOptions = getSharedPreferences("webrtcOptions", Context.MODE_PRIVATE);
SharedPreferences.Editor editor = webrtcOptions.edit();
editor.putString("email", email);
editor.commit();

And in my MainActivity I try to call it like this:

    SharedPreferences webrtcOptions = getSharedPreferences("webrtcOptions", 0);
    String currentUserMail = webrtcOptions.getString("email", "test");
    Log.d("HERE", currentUserMail);

What do you mean by "Log.d does not Show anything"? Does it not show the value you expect, or is there no log statement at all? If there is no log statement at all, then you need to provide more details about where you have put this code. — EJK, Mar 12 '18 at 16:40
Possible duplicate of [How to use SharedPreferences in Android to store, fetch and edit values](https://stackoverflow.com/questions/3624280/how-to-use-sharedpreferences-in-android-to-store-fetch-and-edit-values) — Thomas Mary, Mar 12 '18 at 16:44

score 1 · Answer 1 · edited Jul 29 '18 at 19:52

Try putExtra to send values to another Activities in your LoginActivity:

Intent i = new Intent(LoginActivity.this, MainActivity.class);   
    String strName = null;
    i.putExtra("email", email);

In your MainActivity you get the value like this:

String newString;
if (savedInstanceState == null) {
    Bundle extras = getIntent().getExtras();
    if(extras == null) {
        newString= null;
    } else {
        newString= extras.getString("email");
    }
} else {
    newString= (String) savedInstanceState.getSerializable("email");
}

ygngy · Answer 2 · 2018-03-12T17:14:44.913

Log.d should at least show your string "HERE" if you can not see that it may have one of following reasons

Your Log.d code is not executed, make sure it is executed
Or your android studios log window has bad configuration then do the following:

If you do not see logs from your app check your Android studio's Log window then make sure you have selected

correct emulator or device
correct app
correct filter
make search field empty

sharedpreferences from LoginActivity to MainActivity

2 Answers2