How to read from SharedPreference file android

Question

In my MainActivity, I have written some code which I assume creates a file and saves a value in that file.

public static final String WHAT_I_WROTE = null;
 public void sendMessage(View view) {
    EditText editText = (EditText) findViewById(R.id.editText);
    String message = editText.getText().toString();

    //creates new SharedPreference?
    SharedPreferences saver = getSharedPreferences("saved_text", Context.MODE_PRIVATE);

    //writes to the preferences file called saved_text?
    SharedPreferences.Editor writer = saver.edit();
    writer.putString(WHAT_I_WROTE, message);
    writer.commit();
}

In another activity, I want to be able to read the message and display it but when I try this, it cannot resolve the symbol "saver".

String text_for_display = saver.getString(WHAT_I_WROTE);

What is the mistake I have made here and how do I correct it to read the saved string?

Thanks.

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) — Chris Harris, Jul 03 '17 at 11:46
WHAT_I_WROTE is null here. Should be changed to a valid string. — Ramakanth Putta, Jul 03 '17 at 11:48
please post the code of other activity where you are getting data from shared preference — Abdul Waheed, Jul 03 '17 at 11:48
I wasn't entirely sure what null meant. I thought you had to use that as a placeholder when declaring a string. — Aswin Abraham, Jul 03 '17 at 11:52

Chirag · Accepted Answer · 2017-07-03T11:49:41.270

0

In another activity you have to again initalize the Shared preference.

    SharedPreferences saver = getSharedPreferences("saved_text", Context.MODE_PRIVATE);
    String text_for_display = saver.getString(WHAT_I_WROTE),"any_default_value";

WHAT_WROTE = "anyText"

edited Jul 03 '17 at 11:49

answered Jul 03 '17 at 11:45

Chirag

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WHAT_I_WROTE is null here. Should be changed to a valid string. – Ramakanth Putta Jul 03 '17 at 11:46

score 0 · Answer 2 · answered Jul 03 '17 at 11:47

0

Add this to the other activity you have:

SharedPreferences saver = getSharedPreferences("saved_text", Context.MODE_PRIVATE);

then read it like this

String myValue = saver.getString("saved_text", "default_value");

answered Jul 03 '17 at 11:47

Vincent

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Sunisha Guptan · Answer 3 · 2017-07-03T12:05:44.480

0

Setting values in preference is like,

SharedPreferences.Editor editor = getSharedPreferences("saved_text", MODE_PRIVATE).edit();
 editor.putString("WHAT_I_WROTE", message);
 editor.commit();

Retrieve the data like,

    SharedPreferences prefs = getSharedPreferences("saved_text", MODE_PRIVATE); 
String text_for_display = prefs.getString("WHAT_I_WROTE", null);

edited Jul 03 '17 at 12:05

answered Jul 03 '17 at 11:49

Sunisha Guptan

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it would be confusing that key and the file names are same? – Abdul Waheed Jul 03 '17 at 11:50
what?i didnt get you – Sunisha Guptan Jul 03 '17 at 11:52

score 0 · Answer 4 · edited Apr 09 '18 at 08:56

0

Don't forget to put "context" before "getSharedPreferences" if necessary.

edited Apr 09 '18 at 08:56

Anshul Goyal

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answered Apr 09 '18 at 08:35

Silvain

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How to read from SharedPreference file android

4 Answers4