MainActivity restarts itself by back button in menu of another activity

Question

I have MainActivity with mapFragment inside of it. And I have settings button that starts new activity with settings.The following code starts it

@Override
public void onClick(View v) {
    if(v == findViewById(R.id.btnSettings)){
        Intent AlarmPreferencesActivityIntent;
        AlarmPreferencesActivityIntent = new Intent(App.getContext(), AlarmPreferencesActivity.class);
        AlarmPreferencesActivityIntent.putExtra("alarm", alarm);
        App.getContext().startActivity(AlarmPreferencesActivityIntent);
    }
}

Manifest declaration of activity

<activity
        android:name=".Preferences.AlarmPreferencesActivity"
        android:label="@string/title_activity_alarm_preference"
        android:parentActivityName=".MainActivity" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.example.geoalarm.MainActivity" />
    </activity>

That settings activity has auto-generated back button in menu(you can see on screenshot).

So problem is when I press that button it doesn't return me back to MainActivity, but creates it again. Method onDestroy of MainActivity triggers when I press that back button in settings activity. Can I do something to get MainActivity by clicking back button that was created before I started activity with settings?

I have simple button, that starts settings activity by clicking on it. — Blind Despair, Mar 05 '16 at 17:11
I understand that, I meant the code where you actually start the new activity. — Niels Masdorp, Mar 05 '16 at 17:14
Android may destroy an activity any time it's not visible. You should expect this and be able to deal with it. — Doug Stevenson, Mar 05 '16 at 17:15
Are you trying to say that the Google map displayed in your mapFragment is recreated? Or Are you sure MainActivity is recreated? Did MainActivity's OnCreate get called again? — user3144836, Mar 05 '16 at 17:21
Can you please post the code here. of the settings activity, its manifest declaration and how is the intent called from main activity @BlindDespair — Programming Pirate, Mar 05 '16 at 17:32
@BlindDespair did you write any intent in the back button of the settings activity. — Programming Pirate, Mar 05 '16 at 17:40
point is back button is created automatically, so I don't work with it in code — Blind Despair, Mar 05 '16 at 17:42

score 1 · Accepted Answer · answered Mar 05 '16 at 17:47

I just recollected I had a similar issue in one of my applications,

I used this code in my settings activity which extends PreferenceActivity and implements Preference.OnPreferenceChangeListener

@TargetApi(Build.VERSION_CODES.JELLY_BEAN)
    @Override
    public Intent getParentActivityIntent() {
        return super.getParentActivityIntent().addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
    }

Please add this to your manifest

<activity android:name=".SettingsActivity"
            android:label="@string/title_activity_setting"
            android:parentActivityName=".MainActivity"
            android:theme="@style/SettingsTheme">>
            <meta-data
                android:name="android.support.PARENT_ACTIVITY"
                android:value="com.example.package.MainActivity" />
        </activity>

on options selected simply i created an intent of the settings activity and used it.

This worked in my case. Hope this helps you.

score 0 · Answer 2 · answered Mar 05 '16 at 17:34

0

Try removing this line of code

AlarmPreferencesActivityIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);

Maybe this will help.

answered Mar 05 '16 at 17:34

Randheer

984
6
24

no, it didn't help. point is when settings activity is up, the old mainactivity is not destroyed yet. method onDestroy of MainActivity triggers when I press that back button in settings activity – Blind Despair Mar 05 '16 at 17:36
added to description – Blind Despair Mar 05 '16 at 17:44
android:launchMode="singleTop" add this to your activity in manifest and let me know is it work – Randheer Mar 05 '16 at 17:52
You may need to check this post.... http://stackoverflow.com/questions/12276027/how-can-i-return-to-a-parent-activity-correctly – Randheer Mar 05 '16 at 17:56

MainActivity restarts itself by back button in menu of another activity

2 Answers2