CODEWITHSUNDEEP
javaandroidandroid-activityonactivityresultonbackpressed
Elnoor
Elnoor

Reputation: 3752

onBackPressed() can't make MainActivity to reload

I am trying to reload my MainActivity after I do something in my SettingsActivity. My Up button in SettingsActivity works great and reloads MainActivity when returned from SettingsActivity. But back button saves the data but doesn't reload MainActivity when presses inside SettingsActivity. Basically my getSupportLoaderManager().restartLoader() doesn't work with onBackPressed() Do you know, how can I fix it ?

My MainActivity is something like: 

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    switch (item.getItemId()){
        case R.id.action_settings:
            Intent intent = new Intent(this, SettingsActivity.class);
            startActivityForResult(intent, SETTINGS_REQUEST_CODE);
            break;
    }
    return super.onOptionsItemSelected(item);
}

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if(requestCode == SETTINGS_REQUEST_CODE && resultCode == RESULT_OK){
        getSupportLoaderManager().restartLoader(0, null, this);
    }
}

And my SettingsActivity is something like:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if(item.getItemId() == android.R.id.home){  //WORKS GREAT
        finishSetting();
    }
    return super.onOptionsItemSelected(item);
}

@Override
public void onBackPressed() {   //SAVES DATA BUT DOESN'T RELOAD MAINACTIVITY
    finishSetting();
    //startActivity(new Intent(this, MainActivity.class));
}

private void finishSetting(){
    if(newLanguageSelection==null || newLanguageSelection.equals(getLanguagePreference())){
        setResult(RESULT_CANCELED);
    }
    else {
        setLanguagePreference(newLanguageSelection);
        setResult(RESULT_OK);
    }
    finish();
}

Upvotes: 0

Views: 1009

Answers (3)

RKosamia
RKosamia

Reputation: 191

You should override your onResume() to check if the main activity is refreshed,so whenever you come back from setting activity to main activity .. it will get updated..

Upvotes: 1

user5519264
user5519264

Reputation: 15

In public void onBackPressed() method just write :

getActionBar().setDisplayHomeAsUpEnabled(true);

Upvotes: 0

Bonatti
Bonatti

Reputation: 2781

From the documentation: The activity lifecycle

Edit:

When you started the second activity, your Main is paused, and when the back button is pressed, it is resumed...

On your SettingsActivity, set a flag (such as using a SharedPreferences)

SettingsActivity.onBackPressed(){
   finishSetting();
   SharedPreferences prefs= getSharedPreferences("prefs", MODE_PRIVATE);
   prefs.edit().puBoolean("isShouldReload", true).apply();
}

Then, on MainActivity.onResume

onResume(){
   SharedPreferences prefs= getSharedPreferences("prefs", MODE_PRIVATE);
   if(prefs.getBoolean("isShouldReload", false)){
      // Do your reload.
   }
}

Upvotes: 1

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