Hi I'm trying to set up an app where some of the values stored in sharedPreferences are reset on a weekly basis. I have set up Alarm Manager to begin when a button is clicked as follows:
public class EditPreferences extends PreferenceActivity implements
SharedPreferences.OnSharedPreferenceChangeListener, OnClickListener {
Button button;
Toast mToast;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.prefsbuttons);
button = (Button) findViewById(R.id.bPrefButton);
button.setOnClickListener(this);
addPreferencesFromResource(R.xml.preferences);
getPreferenceManager().getSharedPreferences().
registerOnSharedPreferenceChangeListener(this);
}
protected void onDestroy() {
getPreferenceManager().getSharedPreferences().
unregisterOnSharedPreferenceChangeListener(this);
@overide
super.onDestroy();
public void onClick(View v) {
// TODO Auto-generated method stub
switch (v.getId()){
case R.id.bPrefButton:
Intent intent = new Intent(EditPreferences.this, RepeatingAlarm.class);
PendingIntent sender = PendingIntent.getBroadcast(EditPreferences.this,
0, intent, 0);
SharedPreferences userPrefs = PreferenceManager
.getDefaultSharedPreferences(getBaseContext());
Editor editor = userPrefs.edit();
editor.putInt("savedFlash23", 0);
editor.putInt("savedFlash4", 0);
editor.putInt("savedFlash5", 0);
editor.putInt("savedClean23", 0);
editor.putInt("savedClean4", 0);
editor.putInt("savedClean5", 0);
editor.putInt("savedDog23", 0);
editor.putInt("savedDog4", 0);
editor.putInt("savedDog5", 0);
editor.commit();
// We want the alarm to go off 30 seconds from now.
long firstTime = SystemClock.elapsedRealtime();
firstTime += 15*1000;
// Schedule the alarm!
AlarmManager am = (AlarmManager)getSystemService(ALARM_SERVICE);
am.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
firstTime, 15*1000, sender);
// Tell the user about what we did.
if (mToast != null) {
mToast.cancel();
}
mToast = Toast.makeText(getBaseContext(), "first toast message",
Toast.LENGTH_LONG);
mToast.show();
}
}
}
The toast message displays and the shared preferences are reset.
The intent is passed to the Listener's class where I have the following code:
public class RepeatingAlarm extends BroadcastReceiver
{
@Override
public void onReceive(Context context, Intent intent) {
Toast.makeText(context, "repeat toast message",
Toast.LENGTH_LONG).show();
SharedPreferences userPrefs= PreferenceManager.getDefaultSharedPreferences(context);
Editor editor = userPrefs.edit();
editor.putInt("savedFlash23", 0);
editor.putInt("savedFlash4", 0);
editor.putInt("savedFlash5", 0);
editor.putInt("savedClean23", 0);
editor.putInt("savedClean4", 0);
editor.putInt("savedClean5", 0);
editor.putInt("savedDog23", 0);
editor.putInt("savedDog4", 0);
editor.putInt("savedDog5", 0);
editor.commit();
}
}
Toast message is getting displayed but the values in my shared preferences no longer get reset.
The solution appears to be not to try and do some much in a Broadcast receiver. I have used the following code to launch a new intent, which opens a class extending Activity where the shared preferences can be accessed as normal.
Intent i = new Intent(context, Reset.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(i);