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How to enable back button of phone to go back to previous activity without enabling back button icon on action bar?

Suppose I move to another activity from my current one and then I need to go back to previous activity by pressing the back button originally present in the phone along with a home button and menu button. I have disabled my Action Bar and I don't want to enable it. Nor I want to create an icon in my activity that represents back.
Please Help!

to initiate the back operation you can call
super.onBackPressed();
from your activity.

OnResume() is not called of the home activity when back pressed from a fragment

I am working on an android application. I have cardviews for multiple fragemnts. I have put these cardviews in the main activity. So when I pressed the cardview a fragment will open. So i will make these cardviews visibility as gone. But on back press the onResume() is not called. Hence the layout is not getting visible. I tried many things but did not work. What should I do?

From what I understand, you have an activity with a fragment. Then you load a new fragment and then you press back. This interaction will not fire the activity's onResume() because the activity has never been stopped. If there is logic you need to perform between fragments, it needs to be somewhere else. I cannot provide any more details without some more information.

I think first of all use the navigation on Android Jetpak

multiple fragments and activity all responding to button click in activity

I have a multi-fragment form dividing sections of a form. When the user is finished they hit the submit button at the bottom of the screen which is owned by the hosting activity. When the user clicks submit all the fragments should send their data to the activity and then the activity handles the networking. So I have onClick listeners set for the same button in every fragment, as well as the activity. However when I hit submit onClick only runs once, in some fragment (never in the activity), when it should run 5 times (because I have 4 fragments and 1 activity). Basically I need the fragments to deal with the click and then the activity deal with the same click.

Use the Observer design pattern where the activity is the Subject and the fragments are the Observers

PreferenceActivity, how to make a Preference item that will navigate back through menus?

My overriding question is this: In Android PreferenceActivity, how can I write an OnClickListener which will have the same functionality as pressing the Android back button as I navigate through PreferenceScreen defined menus? That is to say, I would like users of my App to explicity see a menu choice "Back" which will bring them to the previous menu, or bring them out of the menu activity to their previous activity if they are at the root of this particular PreferenceActivity session.
The android developer documents tell us
Note that this XML resource contains a preference screen holding another fragment, the Prefs1FragmentInner implemented here. This allows the user to traverse down a hierarchy of preferences; pressing back will pop each fragment off the stack to return to the previous preferences.
And they are correct about that. I navigate happily through my menus by clicking on PreferenceScreen items to get to that screen, and using the Android back button to go Back up a level. But I'm not sure a casual user really understands the "Back" button, I know I didn't until I read about it in Developer docs. SO I would would like them to have an explicit Preference defined menu choice whos OnClickListener duplicates the function of the Android back button.
So I tried to put in a Preference in my menu that would go back. Having determined that a not Overriden onBackPressed in a my subclass of PreferenceActivity just referred back to Activity.onBackPressed() which merely calls finish(), I tried this OnClickListener:
private OnPreferenceClickListener clickFinishesSuccessfully = new OnPreferenceClickListener() {
#Override
public boolean onPreferenceClick(Preference preference) {
finish();
return true;
}
};
As it turns out, this did NOT do the same thing as pressing the back button! Pressing this button always took me out of the PreferenceActivity entirely, back to the Activity from which I had called my PreferenceActivity. Specifically, it did NOT navigate back through my menus no matter how deep I was when I clicked it.
I am guessing here: When I have gotten to a submenu by clicking an onscreen preference which is really a PreferenceScreen, I am no longer in my own PreferenceActivity. I must be in some other Activity?
So my functional question: what can I put in my OnClickListener of my "Back" Preference to get the same function as the Android Back button navigating through my menus?

I think the casual user should know about the back button. The button is used everywhere so it might be a problem getting used in the first day but after that it's natural. Without being used to the "back" button I can hardly imagine doing the everyday tasks.
The preference you want to add just duplicates functionality and doesn't provide a consistent way with the rest of the system. If Google was considering back being an uncommon thing for casual users would have added that option in phone's Settings which is also a PreferenceActivity.

Switch over tab previous data is coming

I have added a tab bar in my application with four tabs like home stock etc .In that tab bar I have used a nested activity using activity group for all tabs. By default, the home page will show up to the user. If I switch stock tab I am calling stock activity group class from stock activity class. In stock activity I have edittext view with list view. If the users enters 'a' or 'A' value into textwatcher listener I list the value in listview. If I click home tab and come back to the stock tab, that value in listview shows up again. Can anybody tell me how to avoid that?

I solved this problem using ontabchangelistener