I have a activity with multiples initializations ( fragments , sharedpreferences , services , ui components(search bar , buttons etc..)...) and i do not want to restart the activity when the screen orientation change
I found a easy ( and working solution ) by using android:configChanges="keyboardHidden|orientation|screenSize" but my technical manager forbade me this way because according to him it's a bad practice
What are the other ways in order to handle properly the screen orientation changes?
Thank you very much
My main activity
#AfterViews
public void afterViews() {
putSharedPrefs();
initializeFragments();
initializeComponents();
initializeSynchronizeDialog();
initDownloadDialog();
}
You can just add layout for landscape mode.
You just need to add folder layout-land in your "res" directory and define layout for what your activity looks like if it is in landscape mode.
NOTE-Keep xml file name same as the name which is in simple layout folder and which you are using in your activity. It will automatically detect your screen orientation and apply layout accordingly.
EDIT1
Now to save your text from the text view =) Lets assume your textview is named as MyTextView in your layout xml file. Your activity will need the following:
private TextView mTextView;
private static final String KEY_TEXT_VALUE = "textValue";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mTextView = (TextView) findViewById(R.id.main);
if (savedInstanceState != null) {
String savedText = savedInstanceState.getString(KEY_TEXT_VALUE);
mTextView.setText(savedText);
}
#Override
protected void onSaveInstanceState (Bundle outState) {
super.onSaveInstanceState(outState);
outState.putString(KEY_TEXT_VALUE, mTextView.getText());
}
Basically, whenever Android destroys and recreates your Activity for orientation change, it calls onSaveInstanceState() before destroying and calls onCreate() after recreating. Whatever you save in the bundle in onSaveInstanceState, you can get back from the onCreate() parameter.
So you want to save the value of the text view in the onSaveInstanceState(), and read it and populate your textview in the onCreate(). If the activity is being created for the first time (not due to rotation change), the savedInstanceState will be null in onCreate(). You also probably don't need the android:freezesText="true"
You can also try saving other variables if you need to, since you'll lose all the variables you stored when the activity is destroyed and recreated.
Related
I have read a lot of things about the data save instance and restore but Unable to implement in my case. What is my case in application .
I am using the Activity (MainActivity) and calling the fragment in it let say ParentFragment
ParentFragment Calls the ChildFragment in it though ParentFragment has its own views such as TextViews which takes First name, Last name and age and below this part I am programatically calling the ChildFragment
So in this way I have 2 fragments in the MainActivity, which is being shown to the user at a time on the screen
**What I want **
I want when User has change the orientation the layout should also change but I also want that the text fields should maintain there data in them .
I want to save some more fragment variables and their data also on configuration changes and retrieve them after the new layout is set after screen orientation changed.
**Problems and Confusions **
I have no idea If i set the Fragment.setRetainInstance(true) then would my fragment still be able to receive the onConfiguration Change call back?
When I rotate my device, the fragment gets re-initialize and also my activity has the Asynctask and that runs again , i want my activity to hold the same data . How can I achieve that?
Please help me and give me some hint.
If you want to change layout on orientation change then,you should not handle configuration change by retaining the activity(by setting android:configChanges="orientation" value for corresponding activity defined in manifest) or by using setRetainInstance() in fragment.
For saving the fragment state on configuration change use
#Override
protected void onSaveInstanceState(Bundle outState) {
outState.putInt(FIRST_NAME_VALUE_KEY, firstNameTextView.getText());
outState.putInt(LAST_NAME_VALUE_KEY, lastNameTextView.getText());
super.onSaveInstanceState(outState);
}
and for writing back state to the views in fragment use
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.my_fragment, container, false);
if (savedInstanceState != null) {
String firstName = savedInstanceState.getInt(FIRST_NAME_VALUE_KEY);
String lastName = savedInstanceState.getInt(LAST_NAME_VALUE_KEY);
firstNameTextView.setText(firstName);
lastNameTextView.setText(lastName);
}
return view;
}
You will receive onConfigurationChanged() callback by retaining activity.it is not related to Fragment.setRetainInstance(true).
To avoid running asynctask again,We can store data and retain it using following callbacks inside the activity.
#Override
protected void onSaveInstanceState(Bundle savedInstanceState) {
// Save custom values into the bundle
savedInstanceState.putInt(SOME_VALUE, someIntValue);
savedInstanceState.putString(SOME_OTHER_VALUE, someStringValue);
// Always call the superclass so it can save the view hierarchy state
super.onSaveInstanceState(savedInstanceState);
}
in onCreate(Bundle savedInstanceState) call back you can check for savedInstanceSate , based on that you can call u asynctask or retain values as below
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (savedInstanceState == null) {
asyncTask.execute();
} else {
someIntValue = savedInstanceState.getInt(SOME_VALUE);
someStringValue = savedInstanceState.getString(SOME_OTHER_VALUE);
}
}
I have written android app now for a long time but now I'm facing a problem that I have never thought about. It is about the android lifecycle of Activitys and Fragments in in relation to configuration changes. For this I have create a small application with this necessary code:
public class MainActivity extends FragmentActivity {
private final String TAG = "TestFragment";
private TestFragment fragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
FragmentManager fm = getSupportFragmentManager();
fragment = (TestFragment) fm.findFragmentByTag(TAG);
if (fragment == null) {
fragment = new TestFragment();
fm.beginTransaction().add(R.id.fragment_container, fragment, TAG).commit();
}
}
}
And here is my code for the TestFragment. Note that I'm calling setRetainInstance(true); in the onCreate method so the fragment is not recrated after a configuration change.
public class TestFragment extends Fragment implements View.OnClickListener {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
#Override
public View onCreateView(LayoutInflater li, ViewGroup parent, Bundle bundle) {
View rootView = li.inflate(R.layout.fragment_test, parent, false);
Button button = (Button) rootView.findViewById(R.id.toggleButton);
button.setOnClickListener(this);
return rootView;
}
#Override
public void onClick(View v) {
Button button = (Button) v;
String enable = getString(R.string.enable);
if(button.getText().toString().equals(enable)) {
button.setText(getString(R.string.disable));
} else {
button.setText(enable);
}
}
}
And here is the layout that my fragment is using:
<LinearLayout
...>
<EditText
android:id="#+id/editText"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<Button
android:id="#+id/toggleButton"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="#string/enable"/>
</LinearLayout>
My problem is that if I rotate the device the text of the Button change back to the default value. Of course the View of the Fragment is new created and inflated but the saved instance for the Views should be restored. I also have an EditText in my layout and there the text and other properties remains after the rotation. So why is the Button not restore from the Bundle by default? I have read on the developer site:
By default, the system uses the Bundle instance state to save information about each View object in your activity layout (such as the text value entered into an EditText object). So, if your activity instance is destroyed and recreated, the state of the layout is restored to its previous state with no code required by you.
I've also read a lot of answers the last days but I do not know how actual they are anymore. Please do not leave a comment or an answer with android:configChanges=... this is very bad practice. I hope someone can bring light into my lack of understanding.
You should save state of your fragment in the onSaveInstanceState(Bundle outState) and restore it in the onViewCreated(View view, Bundle savedState) method. This way you will end up with the UI just as it was before configuration change.
TextView subclasses don't save their text by default. You need to enable freezesText="true" in the layout, or setFreezesText(true) at runtime for it to save its state.
As per documentation, views should maintain their state without using setRetainInstance(true). Try to remove it from your onCreate, this should force the fragment to be recreated on screen rotation, hence all of it's views should be saved before rotation and restored after.
This stack overflow should answer your question:
setRetainInstance not retaining the instance
setRetainInstance does tell the fragment to save all of its data, and for ui elements where the user has manipulated the state (EditText, ScrollView, ListView, etc) the state gets restored. That being said, normal read-only UI components get reinflated from scratch in onCreateView and have to be set again - my guess would be that their properties are not considered "data" that needs to be retained and restored - Google probably does this for performance reasons. So things like a normal Button, ImageView, or TextView need their contents set manually when they are reinflated if it differs from the initial state in the XML. (TextView's android:freezesText basically puts the TextView in a mode that uses an implementation to save it's state and restore it).
PS: According to this stack overflow Save and restore a ButtonText when screen orientation is switched, you may be able to set android:freezesText on the button to have it keep the text you set - I haven't tried it, but it makes sense.
Edit after Op feedback
Although this fails to answer the question, after consultation with the OP, I've decided to leave it here as a reference point of information on the topic for people who land here. Hope you find it helpful.
Try putting your setRetainInstance in onCreateView. See here
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// setRetainInstance(true);
}
#Override
public View onCreateView(LayoutInflater li, ViewGroup parent, Bundle bundle) {
setRetainInstance(true);
View rootView = li.inflate(R.layout.fragment_test, parent, false);
Button button = (Button) rootView.findViewById(R.id.toggleButton);
button.setOnClickListener(this);
return rootView;
}
Called when the fragment's activity has been created and this
fragment's view hierarchy instantiated. It can be used to do final
initialization once these pieces are in place, such as retrieving
views or restoring state. It is also useful for fragments that use
setRetainInstance(boolean) to retain their instance, as this
callback tells the fragment when it is fully associated with the new
activity instance. This is called after onCreateView(LayoutInflater,
ViewGroup, Bundle) and before onViewStateRestored(Bundle).
developer.android.com/reference/android/app/Fragment.html#onActivityCreated
Control whether a fragment instance is retained across Activity
re-creation (such as from a configuration change). This can only be
used with fragments not in the back stack. If set, the fragment
lifecycle will be slightly different when an activity is recreated:
onDestroy() will not be called (but onDetach() still will be, because
the fragment is being detached from its current activity).
onCreate(Bundle) will not be called since the fragment is not being
re-created.
onAttach(Activity) and onActivityCreated(Bundle) will
still be called.
developer.android.com/reference/android/app/Fragment.html#setRetainInstance
And taken from here:
onCreate : It is called on initial creation of the fragment. You do
your non graphical initializations here. It finishes even before the
layout is inflated and the fragment is visible.
onCreateView : It is called to inflate the layout of the fragment i.e
graphical initialization usually takes place here. It is always called
sometimes after the onCreate method.
onActivityCreated : If your view is static, then moving any code to
the onActivityCreated method is not necessary. But when you - for
instance, fill some lists from the adapter, then you should do it in
the onActivityCreated method as well as restoring the view state when
setRetainInstance used to do so. Also accessing the view hierarchy of
the parent activity must be done in the onActivityCreated, not sooner.
Let me know if this helps.
Problems with app:
When orientation changes the app is experiencing these problems:
Both FragmentA and FragmentC now occupy the FrameLayout container.
What works: Everything works as I want it to...prior to rotating the screen.
Activity description in brief:
EditActivity Purpose: edit collection and item fields.
Fragments this activity programmatically creates:
FragmentA - fragment for editing collection fields
FragmentB - ListFragment of items in collection
FragmentC - fragment for editing item fields.
Initial layout: FragmentA sits atop FragmentB, each in their own FrameLayouts.
When user clicks FragmentB's listview item: replace FragmentA with FragmentC to allow user to edit that item's fields. Now FragmentC sits atop FragmentB.
This seems like a very simple notion: the top portion of the activity is for editing either properties of the collection as a whole or a single item from the collection. I don't feel I have done anything wondrous with the layout so I'm a fair bit perplexed that a simple rotation of the phone (emulator) causes these problems that I am having such a dastardly time trying to fix.
Why the Android Fragment Guide example doesn't work for me: their example is much like what I am doing but their detail fragment is either being opened in a new activity or in its own Frame within the current activity, they don't do any swapping of fragments so I cannot glean how they would use the onSaveIstanceState to preserve the fragments that are visible and then use that information in onCreate to recreate the UI that was there prior to orientation change.
EDIT: took out one problem by caving and putting the listfragment in the XML, this solved the perpetual spinning "loading..." problem.
Solved. Oh, the rabbit holes I traveled... At any rate, if you run into problems like this a couple of things to consider:
ultimately I didn't have to write any code in onSaveInstanceState(Bundle outState).
Ultimately I didn't have to make any considerations about handling the backstack in onSaveInstanceState or deal with it the activity's onCreate.
When first "adding" fragments programmatically to the FrameLayout, use replace instead of `add' - this was likely one of the roots of my troubles.
in onCreate check if savedInstanceState's bundle is null, if(savedInstanceState == null), and if it is then I know that the activity hasn't been torn down previously by a configuration change, so here I build fragments that should be displayed right at activity start up. Other fragments that are programmatically brought to life elsewhere (ie, later than the activity's onCreate()), they don't belong in the if, they belong in the else:
else onSaveInstanceState != null and I know there's only one reason this thing's not null, because the system made a bundle named outState in onSaveInstanceState(Bundle outState) and hucked it at the activity's onCreate method where I can now get my grubbies on it. So it is here that I know a couple of things:
for sure the fragments I created in the activity's onCreate are still a part of the activity (I didn't detach or destroy them), but, I cannot make that same claim for the fragments brought to life via a user's actions, those fragments may or may not be currently (at the time of orientation aka configuration change) attached to the activity.
This is a good place for an if-this-thing-is-attached clause. One of things I initially messed up on was I failed to give ALL of my programmatically added fragments a tag; give all programmatically added fragments tags. I can then find out if the savedInstanceState bundle contains that key with savedInstanceState.containsKey(MY_FRAG_TAG) and with getFragmentManager().findFragmentByTag(MY_FRAG_TAG)
So here's the activity's onCreate (simplified):
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
// ...omitted code...
if(savedInstanceState == null){
// create fragment for collection edit buttons
editCollection = FragmentA.newInstance(someVariable);
// programmatically add fragment to ViewGroup
getFragmentManager().beginTransaction().replace(R.id.edit_topFrame, editCollection, EDIT_COLLECTIONS_TAG).commit();
}
// else there be stuff inside the savedInstanceState bundle
else{
// fragments that will always be in the savedInstanceState bundle
editCollectionFragment = (FragmentA)getFragmentManager().findFragmentByTag(EDIT_COLLECTIONS_TAG);
// fragments that may not be in the bundle
if(savedInstanceState.containsKey(EDIT_ITEM_TAG)){
editItemFragment = (FragmentC)getFragmentManager().getFragment(savedInstanceState, EDIT_ITEM_TAG);
}
}
// This fragment is NOT programmatically added, ie, it is statically found in an XML file.
// Hence, the system will take care of preserving this fragment on configuration changes.
listFrag = (ListViewFragment)getFragmentManager().findFragmentById(R.id.ListFragment);
// create adapter
adapter = new EditCursorAdapter(this, null);
// set list fragment adapter
listFrag.setListAdapter(adapter);
// prepare the loader
getLoaderManager().initLoader(LOADER_ID, null, this);
}
And the Activity's listener for the list fragment, where FragmentC is swapped for FragmentA:
// listfragment listener
#Override
public void listFragListener(Cursor cursor) {
// checking backstack size
Log.d(TAG, SCOPE +"backstack size: "+getFragmentManager().getBackStackEntryCount());
// With each listview click there should be only one item in the backstack.
getFragmentManager().popBackStack();
// create new fragment
editItemFragment = FragmentC.newInstance(cursor);
// programmatically add new fragment
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.replace(R.id.edit_topFrame, editItemFragment, EDIT_ITEM_TAG);
ft.addToBackStack("pop all of these"); // was testing different ways of popping
ft.commit();
// interesting: this reports the same value as the first log in this method.
// ...clearly addToBackStack(null).commit() doesn't populate the backstack immediately?
Log.d(TAG, SCOPE +"backstack size: "+getFragmentManager().getBackStackEntryCount());
}
And onSaveInstanceState is naked as a jay bird:
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
Summary: I have the activity functioning exactly as I want it to.
Now, if I had a bunch of added fragments then I might handle them in a more programmatic fashion rather than by hard coding the if(savedInstanceState.contains(*hard coded key*). This I tested a little bit but cannot attest to its efficacy, however for someone out there this might spark an idea of what you can do:
Make a private Set of added fragments:
// Collection of Frag Tags
private Set<String> AddedFragmentTagsSet = new HashSet<String>();
In onAttachFragment do something like:
#Override
public void onAttachFragment(Fragment fragment) {
super.onAttachFragment(fragment);
// logging which fragments get attached and when
Log.d(TAG, SCOPE +"attached fragment: " +fragment.toString());
// NOTE: XML frags have not frigg'n tags
// add attached fragment's tag to set of tags for attached fragments
AddedFragmentTagsSet.add(fragment.getTag());
// if a fragment has become detached remove its tag from the set
for(String tag : AddedFragmentTagsSet){
if(getFragmentManager().findFragmentByTag(tag).isDetached()){
AddedFragmentTagsSet.remove(tag);
}
Log.d(TAG, SCOPE +"contents of AddedFragmentTagsSet: " +tag);
}
}
Then in the activity's onCreate and within savedInstanceState clauses:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_edit);
// ...omitted code...
if(savedInstanceState == null){
// create fragment for collection edit buttons
editCollection = FragmentA.newInstance(someVariable);
// programmatically add fragment to ViewGroup
getFragmentManager().beginTransaction().replace(R.id.edit_topFrame, editCollection, EDIT_COLLECTIONS_TAG).commit();
}
// else there be stuff inside the savedInstanceState bundle
else{
// fragments that will always be in the savedInstanceState bundle
editCollectionFragment = (FragmentA)getFragmentManager().findFragmentByTag(EDIT_COLLECTIONS_TAG);
//////////// find entries that are common to AddedFragmentTagsSet & savedInstanceState's set of keys ///////////
Set<String> commonKeys = savedInstanceState.keySet();
commonKeys.retainAll(AddedFragmentTagsSet);
for(String key : commonKeys){
editItemFragment = FragmentC)getFragmentManager().getFragment(savedInstanceState, key);
}
}
}
...but that is untested and presented merely to spark ideas; in trying to figure out what was wrong with my activity's handling of configuration changes I did stumble and fumble in this direction and think it might bear fruit for the right person; though ultimately, obviously, I found a simpler way to fix my issues this time around.
I have an aacplayer app and I want to save the state of my activity when orientation changes from portrait to landscape. The TextViews do not appear to be empty, I tried to freeze my textview using this:
android:freezesText="true"
my manifest:
android:configChanges="orientation"
I also tried this:
#Override
public void onConfigurationChanged(Configuration newConfig){
super.onConfigurationChanged(newConfig);
setContentView(R.layout.main2);
So when orientation changes to landscape I can see my layout-land main2.xml, that works but my textview goes out and appears empty. Streaming music works great. I can listen to it when orientation changes, but the text inside textviews are gone each time I change the orientation of my device.
What should I do to fix this so I can save the state?
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
....
....
Thank you very much.
When your orientation changes, you don't have to manually change to the landscape layout file. Android does this automatically for you. When orientation changes, Android destroys your current activity and creates a new activity again, this is why you are losing the text.
There are 2 parts you need to do, assuming you want a separate layout for portrait and landscape.
Assuming you have 2 XML layout files for portrait and landscape, put your main.xml layout file in the following folders:
res/layout/main.xml <-- this will be your portrait layout
res/layout-land/main.xml <-- this will be your landscape layout
That's all you need to do, you don't have to touch the manifest file to modify android:configChanges="orientation" or override the onConfigurationChanged(). Actually, it's recommended you do not touch this for what you are trying to achieve.
Now to save your text from the text view =) Lets assume your textview is named as MyTextView in your layout xml file. Your activity will need the following:
private TextView mTextView;
private static final String KEY_TEXT_VALUE = "textValue";
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mTextView = (TextView) findViewById(R.id.main);
if (savedInstanceState != null) {
CharSequence savedText = savedInstanceState.getCharSequence(KEY_TEXT_VALUE);
mTextView.setText(savedText);
}
}
#Override
protected void onSaveInstanceState (Bundle outState) {
super.onSaveInstanceState(outState);
outState.putCharSequence(KEY_TEXT_VALUE, mTextView.getText());
}
Basically, whenever Android destroys and recreates your Activity for orientation change, it calls onSaveInstanceState() before destroying and calls onCreate() after recreating. Whatever you save in the bundle in onSaveInstanceState, you can get back from the onCreate() parameter.
So you want to save the value of the text view in the onSaveInstanceState(), and read it and populate your textview in the onCreate(). If the activity is being created for the first time (not due to rotation change), the savedInstanceState will be null in onCreate(). You also probably don't need the android:freezesText="true"
You can also try saving other variables if you need to, since you'll lose all the variables you stored when the activity is destroyed and recreated.
There are two ways of doing this, the first one is in the AndroidManifest.xml file. You can add this to your activity's tag
android:configChanges="keyboardHidden|orientation|screenSize|screenLayout"
Or you can override two methods that will take care of this. This method requires some more effort, but arguably is much better. onSaveInstanceState saves the state of the activity before it's killed, and onRestoreInstanceState restores that information after onStart() Refer to the official documentation for a more in depth look.
In my sample code below, I am saving 2 int values, the current selection from the spinner as well as a radio button.
#Override
public void onSaveInstanceState(#NonNull Bundle savedInstanceState) {
spinPosition = options.getSelectedItemPosition();
savedInstanceState.putInt(Constants.KEY, spinPosition);
savedInstanceState.putInt(Constants.KEY_RADIO, radioPosition);
super.onSaveInstanceState(savedInstanceState);
}
// And I am restoring those values with `getInt`, then I can pass those stored values into the spinner and radio button group to select the same values that we saved earlier.
#Override
public void onRestoreInstanceState(#NotNull Bundle savedInstanceState) {
spinPosition = savedInstanceState.getInt(Constants.KEY);
radioPosition = savedInstanceState.getInt(Constants.KEY_RADIO);
options.setSelection(spinPosition, true);
type.check(radioPosition);
super.onRestoreInstanceState(savedInstanceState);
}
static CharSequence savedText;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(savedText != null) {
TextView mTextView = (TextView) findViewById(R.id.main);
mTextView.setText(savedText);
}
}
// Another function in activity, when you change text
public void actionButton(View view) {
// Change and save text in textView
savedText = "Change text";
mTextView.setText(savedText);
}
Its work for me.
But I think its not good code style and architecture for android.
I use in KOTLIN static var / val :
class MyFragment : Fragment()
{
//all my code
//access to static vars -> MyStaticClass.hello
}
class MyStaticClass
{
companion object {
var hello: String = "Static text"
var number_static: Int = 0
}
}
I have a TabActivity that hosts other three activities.
If the first tab is selected, I can change the device orientation and everything is ok.
If I go to the second or the third tab and change the orientation, the tab sub activity's(second and third) onCreate() method gets called twice, for the first time is setting the default tab content(the first one) and at the second onCreate, is setting the selected tab content(as it should for the first time).
Why is onCreate() method being called twice and how can I solve the problem?
EDIT:
I don't want to use android:configChanges="orientation" in the manifest because I want to get the app title and system bar down and on portrait to show them, and this is possible only before setting a content...
use the android:configChanges="orientation" attribute in manifest file like below
<activity android:name=".Settings" android:screenOrientation="portrait"
android:configChanges="orientation"></activity>
Just so that I am clear, are you saying that you have several tabs, which are using different orientations (portrait or landscape), and you are having issues when switching tabs and setting the corresponding orientations properly?
In response to Cata's comment:
Yes, so anytime you rotate the screen the currently viewable activity is destroyed and onCreate is called again (if I recall the steps). What you have to do is call getCurrentTab(), which returns the int value representing the tab, and resetting that as the active tab when onCreate is called. You can do this in several ways...either by having a small method that handles just that and calling it via onCreate, or by using onSaveInstanceState(Bundle) to save your current data, and onRestoreInstanceState() to reload your tab data.
You can set a global int (int currentTab = 0), not setting it in onCreate(), and in your onSaveInstanceState(Bundle) method you can save that to the current tab (currentTab = getCurrentTab()), then in onRestoreInstanceState() you can set it again.
Does that make sense?
Keep in mind that I have not tested that, but willing to do so if you aren't familiar with those two method calls.
Below is an example of saving data to the Bundle - also recall that onCreate accepts that activity bundle as a parameter.
#Override
public void onSaveInstanceState(Bundle outState){
// Store UI state to the savedInstanceState.
// This bundle will be passed to onCreate on next call.
super.onSaveInstanceState(outState);
String strMinSec = timer.getText().toString();
String strMs = timerMs.getText().toString();
long curElapstedTime = elapsedTime;
boolean timerStopped = stopped;
int orientation = this.getResources().getConfiguration().orientation;
outState.putString("MinSec", strMinSec);
outState.putString("Ms", strMs);
outState.putLong("Elapsed", elapsedTime);
outState.putBoolean("Stopped", timerStopped);
outState.putInt("Orientation", orientation);
}
#Override
public void onRestoreInstanceState(Bundle savedInstanceState){
// Restore UI state from the savedInstanceState.
if (savedInstanceState != null){
String MinSec = savedInstanceState.getString("MinSec");
if (MinSec != null)
{
timer.setText(MinSec);
}
String Ms = savedInstanceState.getString("Ms");
if (Ms != null)
{
timerMs.setText(Ms);
}
long elapsed = savedInstanceState.getLong("Elapsed");
if(elapsed > 0)
elapsedTime = elapsed;
int theOrientation = savedInstanceState.getInt("Orientation");
//if(theOrientation > 0)
//this.setRequestedOrientation(theOrientation);
}
}
I think the best solution is to take a different approach by using a single Activity and put every tab content in a different LinearLayout and in onClick() methods of the tabs(which will be some buttons) to switch between the layouts...
If anybody have a better idea, please post it here!
Thank you!