重新加载SharedPreferences

Question

I'm quite new to Android Prorgramming and have a problem understandig SharedPreferences. I have a Main Activity and a Settings Activity. I want to be able to change a SharedPreference (here called firstWaitTime) in the Settings Activity and work with it in the Main Activity. I can Set the new value in the settings, but in the Main Activity i only see the new value when i close and reopen the app.

I Think i would need a OnPrefrenceChanged Listender but i have no idea how to implement it...

The Main one looks like this:

 public class MainActivity extends ActionBarActivity { //Radio Button private int stufe; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); SharedPreferences settings = this.getSharedPreferences("settings", Context.MODE_PRIVATE); int firstWaitTime = settings.getInt("firstWaitTime", 12); int secondWaitTime = settings.getInt("secondWaitTime", 8); int thirdWaitTime = settings.getInt("thirdWaitTime", 6); //TEST final TextView test = (TextView) findViewById(R.id.test); test.setText("" + firstWaitTime); } 

The Settings Activity looks like this:

  @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_settings); final SharedPreferences settings = this.getSharedPreferences("settings", MODE_PRIVATE); //BUTTON final EditText edit1 = (EditText) findViewById(R.id.edit1); Button save=(Button) findViewById(R.id.savebtn); save.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { //prefs = getSharedPreferences(prefName, MODE_PRIVATE); //SharedPreferences.Editor editor = prefs.edit(); SharedPreferences.Editor editor = settings.edit(); //---save the values in the EditText view to preferences--- editor.putInt("firstWaitTime", Integer.parseInt(edit1.getText().toString())); //---saves the values--- editor.commit(); Toast.makeText(getBaseContext(), "Saved", Toast.LENGTH_SHORT).show(); } }); } 

What is the best way to achieve this?

Answer 1

onCreate() will not be called as Android hasn't killed the Activity. Try putting your code in onResume() instead. For more info read up on the Android Activity lifecycle .