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!
Main activity 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;
}
}
}
