Refresh(recreate) the activities in back stack when change locale at run time

I have an Activity say ActivityMain from this activity I moved to another activity called ActivitySettings and in settings activity I'm changing the App locale by clicking on a button, and using recreate I achieved the change I need in current activity but when I press back my `ActivityMain' will resume but locale is not updated.

ActivityMain

ActivitySettings

Can some one tell me how to 'Recreate' backstack activities? what will be the correct approach.

I can't call recreate on refresh as it will be infinite loop

Look at here developer.android.com/training/basics/intents/result
– VolkanSahin45
2 days ago

1 Answer
1

In each Activity's onCreate() you can maintain the currentLangCode. Check this value in onResume(), if it differs, you can conclude the locale was change and recreate()

onCreate()

currentLangCode

onResume()

recreate()

You can do it as follows:

public class ActivityA extends AppCompatActivity{
private String currentLangCode;
@Override
protected void onCreate(Bundle savedInstanceState) {
...
currentLangCode = getResources().getConfiguration().locale.getLanguage();
...
}
@Override
public void onResume(){
...
if(!currentLangCode.equals(getResources().getConfiguration().locale.getLanguage())){
currentLangCode = getResources().getConfiguration().locale.getLanguage();
recreate();
}
}
...
}


If you want to apply it for all the Activities, then simply create BaseActivity as follows:

public class BaseActivity extends AppCompatActivity{
private String currentLangCode;
@Override
protected void onCreate(Bundle savedInstanceState) {
...
currentLangCode = getResources().getConfiguration().locale.getLanguage();
...
}
@Override
public void onResume(){
...
if(!currentLangCode.equals(getResources().getConfiguration().locale.getLanguage();)){
currentLangCode = getResources().getConfiguration().locale.getLanguage();
recreate();
}
}
...
}


Extend all Activities from BaseActivity

BaseActivity

public class ActivityA extends BaseActivity{

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
...
}
@Override
public void onResume(){
super.onResume();
}
...
}


thank you for the answer, let me try and update.
– Praneeth
2 days ago

Sure. Let me know.
– Sagar
2 days ago

getResources().getConfiguration().locale.getLanguage() this this is not giving changed language it is still giving me old lang and the condition is always flase I made a work around by checking with shareprefs where i'm saving the changed language
– Praneeth
2 days ago

Thanks for update
– Sagar
2 days ago

@Praneeth, just tested the value, its returning correct value for me.
– Sagar
2 days ago

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