When I rotate my device, Google Maps v2 refreshes. How do I prevent this refresh from occurring? I'm adding the map dynamically in a tab of a SherlockFragment.
I fixed the problem by adding to the Activity in AndroidManifest.xml:
android:configChanges="orientation|screenSize"
Edit (04/28/2017) :
From the Android Documentation:
Note: Using this attribute should be avoided and used only as a last resort. Please read Handling Runtime Changes for more information about how to properly handle a restart due to a configuration change.
Maybe you could look at this answer, which properly saves the SupportMapFragment using the Bundle available in the onCreate method of FragmentActivity.
Emil's comment is right in explaining why the view of your map is being reset. Forbidding the orientation change via the manifest however is not good style.
You need to retain the map fragment somehow or retain the fragment that contains the map fragment. After your 'host' activity has been recreated, you need to reattach the fragment to the activity instead of creating a new one.
I don't have any code here but you'll find information about retaining fragments on the web.
As an alternative you could save your maps state (foremost the camera position I guess) somewhere else and restore it after the fragment has been recreated.
You can't, the map is getting refreshed because the Activity is getting re-created on configuration changes (screen rotations...). You could prevent the rotation of the Activity by using:
android:screenOrientation="landscape"
or
android:screenOrientation="portrait"
in the Manifest file under your map Activity.
and this way prevent it from being recreated on rotations.
Sadly the way Google Handles map refreshing issue that you are seeing by
android:configChanges="orientation|uiMode|screenSize|fontScale"
android:screenOrientation="user"
on the Activity tag in the Manifest in the Google maps application.
Related
So I am trying to integrate Google Maps into my application, I came across a concept that I don't entirely understand. I have seen that adding google maps into an app and it seems the most common way to do so is with an activity.
I found some websites and a SO question showing how to put Google Maps in a fragment, but would that be an issue if the user is constantly clicking on profiles and going back? Causing the map to be recreated or resumed constantly. Would that performance be better if the map was an activity instead?
Basically, Im not sure the best way to transition from an activity GUI to a fragment? I've had an app that only used 1 activity, I just used multiple different fragments changing them with this code
FragmentManager fm = getFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
Fragment fragment = getFragmentManager().findFragmentById(R.id.framecontainer);
if (fragment == null) {
ft.add(R.id.framecontainer, frag, tag);
} else {
ft.replace(R.id.framecontainer, frag, tag);
}
ft.addToBackStack(null);
ft.commit();
I am confused because when I created my main activity, I called
setContentView(R.layout.baselayout);
This layout contained only a frame container, I would then add in a HomeScreenFragment right away and when I needed to change, I would use the FragmentTransaction code above.
However, if my new MapActivity used setContentView(R.layout.maplayout); how would I best change screens? If R.id.maplayout does not contain a framelayout, is it best to start a new activity that uses many fragments like the one I mentioned before? I remember hearing that calling setContentView more than once or outside onCreate() is bad practice.
It seems I am missing something because so far it seems like there is 2 ways of using activities with different layouts
Starting a new activity every time and just trying to minimize the amount of activities.
Make an activity with a FrameLayout and just swap fragments everytime
To address my actual problem
I want my users to click another user marked on the map which will bring them to a profilelayout and view that user's profile, should I use one of the 2 methods above or how should I go about doing so?
Do you guys have any input to point me in the best direction? Thanks!
If your current application is already fragment heavy, have you considered using MapFragment? I think if you're cleaning up your objects/resources appropriately it shouldn't really be a performance issue.
Also according to the documentation it says the following about the MapFragment:
It's a wrapper around a view of a map to automatically handle the necessary life cycle needs.
I think it's also good to note that it's possible for you to do layout manipulation by adding/removing views using the LayoutInflater.
I've seen the various other Android posts that talk about editing the part of the XML file that determines the main activity. But this simple solution isn't working for me at all, presumably because I'm trying to change the main activity in a large app, and the resulting loose ends leads to a ton of bugs.
In addition to changing the startup activity, I've also added an activity tag for the ex-startup activity that is replacing it. But I don't know which changes I should add to deal with the Fragments that are messed up by the startup activity change.
I'm getting this error:
/AndroidRuntime( 741): Caused by: java.lang.IllegalArgumentException: No view found for id 0x7f05003c for fragment PlaceholderFragment{42894810 #0 id=0x7f05003c}
Would appreciate any help.
Edit: I have also changed my layout settings to correspond to the fragment layout instead of the activity layout. I also made it so that the new activity extended Activity instead of ActionBarActivity. Is there anything else I should do?
I think you have not used PlaceHolderFragment that was automatically added when a new project was created. You must have edited the fragment_main xml file and try to use findviewby id in your MainActivity oncreate method. The new update to adt has many people making this simple mistake.
Alright. My first question here. And I already found some solution, but honestly do not really get the stuff that happens in the background. So perhaps there’s someone who could clear up this stuff a little bit. After days of debugging I’m just glad that it works... and hope I did not make some serious error. So let’s have a look.
I got some Main-Activity. Just a FragmentActivity extending JFeinstein’s SlidingFragmentActivity. Further I decided to go the fragment-way and just put any content (list-fragment, article-fragment, …) as a fragment into a container (to right of the sliding-menu); my main-container. So far, so good.
One essential fragment is my article-fragment. A ViewPager (with a FragmentStatePagerAdapter) - containing some pages with text and perhaps another list-fragment. Still no problem so far, until I decide to rotate the device. And to be more precise, rotating the device works too as long as I do not decide to update my article-fragment.
I understood (correct me if I am wrong) that Android handles the fragments state on its own when rotating the device. And it seems to be everything fine just until I want to reload/update its content.
Ok let’s dig deeper into that.
On first start I got some empty main-container. Then I am loading my article-fragment for the first time. Just getting the SupportFragmentAdapter, creating my ArticleFragment and replace the main-container with the newly created fragment - tagged. No rocket-science - just a simple transaction:
ViewPagerFragment pagerFragment = (ViewPagerFragment)
getSupportFragmentManager().findFragmentByTag(TAG_FRAGMENT_ARTICLE);
if(pagerFragment != null){
if(pagerFragment.isResumed()){
pagerFragment.triggerReload();
}
} else {
pagerFragment = new ViewPagerFragment();
FragmentTransaction t = getSupportFragmentManager().beginTransaction();
t.replace(R.id.id_main_root_frame, pagerFragment, TAG_FRAGMENT_ARTICLE);
t.commitAllowingStateLoss();
}
To avoid creating a fragment each time I reload my content, I’m trying to fetch the fragment before the transaction and - if it is found and resumed - trigger some reload on the existing fragment.
Now I rotate my device in this state. To avoid messing with the fragment state I left onSaveInstanceState() inside the fragment untouched. So I guess the fragment is just destroyed and recreated. And everything still works so far. But I think this part has something of a black box.
After that - normal startup, creating fragment and put into main-container, rotating device - I trigger some update. But instead of finding the old (recreated) fragment by tag, nothings found and a new fragment is created and inserted. At least tried to be inserted, because this is where I got the following exception:
java.lang.IllegalStateException: Activity has been destroyed
To be precise, I get the above exception when finish my transaction with a commitAllowingStateLoss(). When I just commit() the transaction I get the following exception:
java.lang.IllegalStateException: Can not perform this action after onSaveInstanceState
So that’s where the error comes up. And after ages of debugging and searching I found some hint on this question/answer to get the SupportFragmentManager on a WeakReference of my MainActivity. And what should I say. Since I implemented that, it works. I had to change my update-process a bit, but it works. But leaves some questions ...
The behaviour seems to be similiar. First creation works perfect. Reload just the same - fragment is found by tag. After rotation, article is still shown. And when I reload the fragment with that state it is not found by tag so a new one is created, but the commit()-request does not throw an exception. A look inside the debugger shows that the WeakReference is some other instance (other id), than the one(this) all of this takes place in. And thats where I lose the plot. ..
If some of you could give me some hints, would be great!
Thanks in advance!
try this:
commitAllowingStateLoss(); instead commit();
I'm making a binding from Unity3D to a Java SDK. That Java SDK adds a View (RelativeLayout) to the current Activity (UnityPlayer.currentActivity) with an android.widget.Button in it.
The view is perfectly displayed but when the user touches/tap the button, the OnClickListener.onClick method of the button isn't called.
The view with the button is added using this code :
UnityPlayer.currentActivity.addContentView(view, params);
I think that Unity probably catches all user touch events. Is it possible to forward them so that the Button can fire the onClick ? Is there another way ?
Thanks in advance for your help.
Edit :
I tried to add in my Manifest for com.unity3d.player.UnityPlayerNativeActivity :
<meta-data android:name="unityplayer.ForwardNativeEventsToDalvik" android:value="true" />
But no result so far :(
I did find a workaround while trying to solve this in one of my projects.
Solution:
ProxyActivity is the first activity that comes up. This opens Activity or NativeActivity, depending on the android version.
Make sure that the Activiy (not the NativeActivity) is shown. Code snippet to change in ProxyActivity:
Class activity = Class.forName(classNames[0]);
^^ Always force it to open the class which extends Activity and not the Native one.
Your assumption is correct, Unity is catching the input.
If you want to capture the input instead of Unity - you have to put your view into a separate window (Dialog), or create your own Activity. Both options are creating their own input loops hence overriding Unity loop.
I have seen the following links before posting this question
http://www.devx.com/wireless/Article/40792/1954
Saving Android Activity state using Save Instance State
http://www.gitshah.com/2011/03/how-to-handle-screen-orientation_28.html
How to save state during orientation change in Android if the state is made of my classes?
I am not getting how should i override the following function :
#Override
public Object onRetainNonConfigurationInstance() {
return someExpensiveObject;
}
In my application i have layout with one editext visible and other editext get visible when the data of first editext validates to true.I have set the visbility of all other editextes and textviews to false and make them visible after validating.
So in my activity if the screen orientation is changed then all the items having android:visibility="false" get invisible.
I have also came to know that when our activities screen orientation changes it calls onStop() followed by onDestroy() and then again starts a fresh activity by calling onCreate()
This is the cause .. But i am not getting how to resolve it ..
Here You can see the screenshots of my application :
in this image all fields are loaded
and in another image when the screen orientation is changed to landscape they are all gone
Any link to tutorial or piece of code will be highly appreciable.
And also my application crashes when a progress dialog is shown up and i try to change screen orientation.How to handle this ??
Thanks
Well if you have the same layout for both screens then there is no need to do so just add below line in your manifest in Activity node
android:configChanges="keyboardHidden|orientation"
for Android 3.2 (API level 13) and newer:
android:configChanges="keyboardHidden|orientation|screenSize"
because the "screen size" also changes when the device switches between portrait and landscape orientation.
From documentation here: http://developer.android.com/guide/topics/manifest/activity-element.html
There is another possibility using which you can keep the state as it is even on Orientation change using the onConfigurationChanged(Configuration newConfig).
Called by the system when the device configuration changes while your activity is running. Note that this will only be called if you have selected configurations you would like to handle with the configChanges attribute in your manifest. If any configuration change occurs that is not selected to be reported by that attribute, then instead of reporting it the system will stop and restart the activity (to have it launched with the new configuration).
At the time that this function has been called, your Resources object will have been updated to return resource values matching the new configuration.
There are 2 ways of doing this, the first one is in the AndroidManifest.xml file. You can add this to your activity's tag. This documentation will give you an in depth explanation, but put simply it uses these values and tells the activity not to restart when one of these values changes.
android:configChanges="keyboardHidden|orientation|screenSize|screenLayout"
And the second one is: overriding onSaveInstanceState and onRestoreInstanceState. This method requires some more effort, but arguably is better. onSaveInstanceState saves the values set (manually by the developer) from the activity before it's killed, and onRestoreInstanceState restores that information after onStart() Refer to the official documentation for a more in depth look. You don't have to implement onRestoreInstanceState, but that would involve sticking that code in onCreate().
In my sample code below, I am saving 2 int values, the current position of 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 we restore those values with `getInt`, then we can pass those stored values into the spinner and radio button group, for example, 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);
}