I am creating an android application with three tabs using PageSlidingtabStrip as a library to create a swipe view.And it has three fragments.Each fragments has a list view.When the item of the listview is clicked it opens an activity and display the details.
The problem is how can i come back to the fragment in the main screen using back button in actionbar in the activity
And how can i go to the corresponding Fragment(Tab)
Try something like this :
#Override
public void onBackPressed() {
// TODO Auto-generated method stub
super.onBackPressed();
Intent intent = new Intent(YourCurrentClass.this , ClassThatYouWantToGo.class);
startActivity(intent)
}
Or actually like #TommyTopas said, you can just Override onBackPressed and put this.finish();.
EDIT
As I've understood you want to use a button on your AcitonBar, then you have tod o something like this :
First set the HomeButton enabled doing :
getActionBar().setDisplayHomeAsUpEnabled(true); Then Override onOptionsItemSelected
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
// or onBackPressed();
this.finish()
}
return true;
}
As I understand, when you return to the "Tab" Activity, you want to display the same tab in which the list item had been clicked. What you can do is, when a list item in any tab is clicked, save the tab number in onSavedInstanceState(), and when the Activity is recreated, then set the previously selected tab (if one was selected previously). You will get the savedInstanceState that you saved in onSavedInstanceState() back in the onCreate() of the same Activity.
You can provide an Up navigation by writing getActionBar().setDisplayHomeAsUpEnabled(true); and then in the onOptionsItemSelected method in the activity, if the item's id is android.R.id.home call the activity's method onBackPressed(); which will close your current activity and come back to your fragment
Related
Generally switching from one activity to another activity hamburger icon is replaced with back arrow. I want to control the functionality of that arrow. I have seen many contents here but most of them were related to hardware's back button. How can I control that?
I am trying the functionality in case of fragments. Also I have Navigation drawer attached with the hamburger icon.
I tried this-
if(id == android.R.id.home){
getSupportFragmentManager().beginTransaction().replace(R.id.main_container, new AmbulanceMap()).commit();
getSupportActionBar().setTitle("Book A Ride");
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
}
but doesnt work as I hoped.
I want my back button to change the fragmentto previous fragment.
I had the same problem once. Just like you, things like checking if Android.R.id.home is clicked didn't work.
But I solved it using that:
Set navigation listener to toolbar:
toolbar.setToolbarNavigationClickListener(v -> onBackPressed());
If it should be within fragment:
Create an public method in activity.
In fragment's onAttach (or later) cast getActivity() to your activity and call method you was defined previously.
Example:
// YourActivity
public void setHomeListener(OnLickListener listener){
toolbar.setToolbarNavigationClickListener(listener);
}
//Fragment's onCreate
((YourActivity)getActivity()).setHomeListener(v -> onBackPressed());
//Fragment's onDestroy
((YourActivity)getActivity()).setHomeListener(null);
And, of course, set home us up enabled to show back arrow.
EDIT
if you don't use labmdas u should use:
(YourActivity)getActivity()).setHomeListener(new OnClickListener() {
#Override
public void onClick(View v) {
YourFragment.this.onBackPressed();
}
});
The back button of the ActionBar is a menuItem so you need to override onOptionsItemSelected like this:
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()){
case android.R.id.home:
//Your back button logic here
break;
}
return true;
}
Also don´t forget to add getSupportActionBar().setDisplayHomeAsUpEnabled(true); after setting the Toolbar
I've had a look at this question-
Call OnResume when Back Button Pressed when using Fragments
I've done the same things, as mentioned in the answers, but neither is onResume called, nor onCreateView. It's a transaction from an activity to a fragment, all of which are a part of a single tab. How can I call a method from the first fragment when back button is pressed on the second fragment?
Code-
Bundle data = new Bundle();
data.putString("q", code);
data.putString("type", type);
data.putString("name", name);
viewPager.setCurrentItem(1);
android.support.v4.app.FragmentTransaction transaction =
getSupportFragmentManager().beginTransaction();
eq equity = new eq();
equity.setArguments(data);
transaction.replace(R.id.root_frame, equity).addToBackStack(null).commit();
The method called when you press the back button is onOptionsItemSelected
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
default:
return super.onOptionsItemSelected(item);
}
}
#Override
public void onBackPressed() {
if (yourCondition = true) {
//do something here
} else {
super.onBackPressed();
}
}
But onOptionsItemSelected is called on the parent activity.
I don't know if the back button is required, but I think it's better to implement a callback from one fragment to the other with an Interface and using a custom button not the back button.
fragment life cycle is directly effected by the host's activity life cycle so you gotta take that in consideration anyway did you try to call the method in onPuase() or in onStart() in the fragment that you are heading for after pressing back ? if that didn't work try to reach the emulator back button from if (keyCode == KeyEvent.KEYCODE_BACK) or you can finish() the previous fragment or activity so the back button will get the user no where and create your own back button to redirect the user and replace the method in it using onClick() .
hope that will work for you good luck
I have a simple 2 activity application. The main activity populates a listFragment, and the second activity populates a fragment with fields to add a custom object (list items) to the main activity.
In the second activity I have a "save" icon in the action bar. I'm trying to figure out how to listen for this button click in the fragment, so I can package up the textFields and pass it back to the activity via the interface.
I tried to override onOptionItemSelectedbut it doesn't ever hit. How would I handle this?
Okay, so the trick is in the fragments onCreate method, you have to call
setHasOptionsMenu(true);
then all you have to do is override the onOptionsItemSelected in the fragment, and handle the action bar click there!!
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.action_save : {
Log.i(TAG, "Save from fragment");
return true;
}
}
return super.onOptionsItemSelected(item);
}
I'm using a navigation drawer in a main activity with many fragments
For example :
I have fragment 1 for presentation
And fragment2 that contains a listView.
If I click an item in the listView it will launch another activity
When i click the action bar back button i want to go to the main activity fragment2
But the fragment1 is used
How can I use the second fragment
Thanks for your answers
In your second activity's onCreate, put(although i think you already have) :
getActionBar().setDisplayHomeAsUpEnabled(true);
and inside second activity's options handling(i think you've done this too) :
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case android.R.id.home:
//perhaps use intent if needed but i'm sure there's a specific intent action for up you can use to handle
finish();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
and inside your first activity's onCreate's intent handler for example :
if(Intent.ACTION_VIEW.equals(action))
you set the current page of the viewpager with viewpager.setCurrentItem(position). If you want to change the page for different items you could use intent.putExtra() in your second activity and then retrieve it in your first activity.
I have added the code below in my second activity :
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// TODO Auto-generated method stub
onBackPressed();
return true;
}
It's working as I expected
is it a clean solution ?
Thanks
I have three activites, lets call them A, B, and C.
I initially have activity A passing data with intent and calling activity B to open, displaying the data passed from activity A.
Now the issue is when I open activity C from activity B, and use the up navigation that I set up by setting activity B as the parent of Activity C in manifest, none of the data is displayed from Activity A in Activity B. If i simply make a button and call finish(); on the button instead, and not use the up navigation, the activity still contains all data from activity A just how I want it in Activity B.
I'm assuming this has to do with the lifecycle of using up navigation? I even tried using the intent from activity B to C by passing data, and then onResult have it return back to activity B, but it seems the onActivityResult is never called when up navigation is clicked. Any ideas? Maybe I can override this up navigation to just call finish(), like my button does, and nothing more?
Assuming you already have the parent activities defined at the Manifest, make sure you override the following methods:
#Override
public void onCreate(Bundle savedInstanceState) {
// You code here
getActionBar().setDisplayHomeAsUpEnabled(true);
// or getSupportActionBar().setDisplayHomeAsUpEnabled(true) if using support actionbar, i.e., for targets < 3.0;
}
Now you will be able to catch the action of the "Up" button with the Id android.R.id.home.
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
NavUtils.navigateUpFromSameTask(this);
return true;
}
return super.onOptionsItemSelected(item);
}