title: Reloading SharedPreferences data
body: <p>I am making an android application which has a main activity and several other ones. The main activity(As well as some of the other ones) load data fra SharedPreferences. But, when i launch a new activity, which has some options that can change the data in SharedPreferences that i use in the main activity, and i return to the main activity using the back button, the data there is still the same(Same as before i changed it), somehow i have to reload the data there from SharedPreferences once i return to the main activity, how is this possible??? Please help me and thanks so much in advance!</p>
  
  <p>Main activity code:</p>
  
  <pre><code>package com.mycompanyname.myappname;
  
  import java.util.Calendar;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.content.SharedPreferences;
  import android.os.Bundle;
  import android.preference.PreferenceManager;
  import android.view.Menu;
  import android.view.MenuInflater;
  import android.view.MenuItem;
  import android.view.View;
  import android.view.View.OnClickListener;
  import android.widget.Button;
  import android.widget.TextView;
  
  public class myActivity extends Activity implements OnClickListener {
  /** Called when the activity is first created. */
  TextView nextAirFilterCleaningTextView, nextPistonChangingTextView, nextOilChangingTextView;
  Button manageButton;
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.main);
  
      //Import views
      manageButton = (Button)findViewById(R.id.manageButton);
      nextAirFilterCleaningTextView = (TextView)findViewById(R.id.nextAirFilterCleaningTextView);
      nextPistonChangingTextView = (TextView)findViewById(R.id.nextPistonChangingTextView);
      nextOilChangingTextView = (TextView)findViewById(R.id.nextOilChangingTextView);
  
      //Setup onClickListener for the buttons
      manageButton.setOnClickListener(this);
  
      //Check if the user has been using his motorcycle
      android.content.Context ctx = getApplicationContext();
      Intent i = new Intent(ctx, UsageActivity.class);
      i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
      ctx.startActivity(i);
  
      //Load first time use screen
      SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(getBaseContext());
      boolean previouslyStarted = prefs.getBoolean(getString(R.string.pref_previously_started), false);
      if(!previouslyStarted){
      SharedPreferences.Editor edit = prefs.edit();
      edit.putBoolean(getString(R.string.pref_previously_started), Boolean.TRUE);
                  edit.commit();
                  android.content.Context ctx5 = getApplicationContext();
                  Intent i5 = new Intent(ctx5, FirsttimeusageActivity.class);
                  i5.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                  ctx5.startActivity(i5);
  }
  
      //Load information from SharedPreferences
      SharedPreferences settings = getSharedPreferences("settingsInfo", 0);
      nextAirFilterCleaningTextView.setText("Next air filter cleaning: " + settings.getString("daysTillAirFilterCleaning", "") + " days");
      nextPistonChangingTextView.setText("Next piston changing: " + settings.getString("hoursTillPistonChange", "").toString() + " hours of usage left");
      nextOilChangingTextView.setText("Next oil changing: " + settings.getString("hoursTillOilChange", "").toString() + " hours of usage left");
  }
  @Override
  public boolean onCreateOptionsMenu(Menu meny) {
      MenuInflater inflater = getMenuInflater();
      inflater.inflate(R.menu.menubuttons, meny);
      return true;
  }
  @Override
  public boolean onOptionsItemSelected(MenuItem item) {
      switch(item.getItemId()) {
      case R.id.NewEvent:
          //Create new calendar event
          Calendar cal = Calendar.getInstance();              
          Intent intent = new Intent(Intent.ACTION_EDIT);
          intent.setType("vnd.android.cursor.item/event");
          intent.putExtra("beginTime", cal.getTimeInMillis());
          intent.putExtra("allDay", true);
          intent.putExtra("rrule", "FREQ=YEARLY");
          intent.putExtra("endTime", cal.getTimeInMillis()+60*60*1000);
          intent.putExtra("title", "");
          startActivity(intent);
          break;
      case R.id.About:
          //Load about activity and screen
          android.content.Context ctx6 = getApplicationContext();
          Intent i6 = new Intent(ctx6, AboutActivity.class);
          i6.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          ctx6.startActivity(i6);
          break;
      case R.id.settings:
          //Load settings activity and screen
          android.content.Context ctx4 = getApplicationContext();
          Intent i4 = new Intent(ctx4, settingsActivity.class);
          i4.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          ctx4.startActivity(i4);
          break;
      case R.id.Homepage:
          //Load webpage by using custom activity
          android.content.Context ctx = getApplicationContext();
          Intent i = new Intent(ctx, Activity.class);
          i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          ctx.startActivity(i);
          break;
      case R.id.famoustracks:
          android.content.Context ctx7 = getApplicationContext();
          Intent i7 = new Intent(ctx7, Activity.class);
          i7.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          ctx7.startActivity(i7);
          break;
          }
      return true;
  }
  public void onClick(View src) {
      switch(src.getId()) {
      case R.id.manageButton:
          android.content.Context ctx1 = getApplicationContext();
          Intent i1 = new Intent(ctx1, ManageActivity.class);
          i1.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
          ctx1.startActivity(i1);
          break;
      }
  }
  }
  </code></pre>