Question

I made a small project where i try to change the name from edit text using share preference.Here is my code

SharePreferenceOwnActivity.java

public class SharePreferenceOwnActivity extends Activity {


    Button b1;
    TextView t1;


    /** Called when the activity is first created. */@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


        b1 = (Button) findViewById(R.id.b1);
        t1 = (TextView) findViewById(R.id.t1);
        LoadPreferences();




        b1.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                Toast.makeText(getApplicationContext(), "Settings", Toast.LENGTH_SHORT).show();
                Intent intent = new Intent().setClass(SharePreferenceOwnActivity.this, SharepreferenceActivity.class);
                startActivity(intent);

            }
        });

    }
    private void LoadPreferences() {
        SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
        String strSavedMem1 = sharedPreferences.getString("MEM1", "");
        t1.setText(strSavedMem1);

    }
}

SharepreferenceActivity.java

public class SharepreferenceActivity extends Activity {


    EditText e1;
    Button b2;
    /** Called when the activity is first created. */@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.settings);


        e1 = (EditText) findViewById(R.id.e1);
        b2 = (Button) findViewById(R.id.b2);


        b2.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {

                SavePreferences("MEM1", e1.getText().toString());
                Intent intent = new Intent().setClass(SharepreferenceActivity.this, SharePreferenceOwnActivity.class);
                startActivity(intent);

            }
        });


    }

    private void SavePreferences(String key, String value) {
        SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);
        SharedPreferences.Editor editor = sharedPreferences.edit();
        editor.putString(key, value);
        editor.commit();
    }
}

Here the edit text doesnot change the textview. 🙁 why? I did not get the error

Answer 1

You have problem in following statement.

SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);

As per Google Doc

The above Retrieves a SharedPreferences object for accessing preferences that are
private to this activity

So the Error you have done is

you are setting preference in Preference Object which is private to
SharepreferenceActivity

And

you are trying to read from Preference Object which is private to SharePreferenceOwnActivity

So solution is

Replace

SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE);

By

SharedPreferences sharedPreferences = getSharedPreferences("MyPref",
                                      Context.MODE_PRIVATE);

In Both Activities.