I have an Activity with a TextView, created in the usual findViewById method, using the definition from my xml layout file.
I'm updating the text in the TextView using a handler, created in the onCreate() method.
When I switch orientation, the TextView no longer updates from the same Handler.
If my xml definition states a value for android:text="blabla", then I see "blabla" in the view, but cannot update it anymore.
What's happening?!
When u switch orientation, android create new view.
I'd suggest making that mHandler volatile.
If u decide just to use only one orientation, for landscape add android:screenOrientation in activity tag in android manifest
The reason why you cannot update anymore is because Activity reference is different.
Your first created Activity 'A', has handler 'a'.
Now handler 'a' only can update view that belong Activity 'A'.
So when orientation happened, Activity 'A' is destroyed and Activity 'B' and handler 'b' is created.
So 'a' cannot update 'B's view in front of screen.
For quick solution I recommend you disable re-create activity when mobile orientation rotated.
AndroidManifest.xml
<activityandroid:name=".MyActivity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/app_name">
Activity
#Override
public void onConfigurationChanged(Configuration newConfig){
super.onConfigurationChanged(newConfig);
// Checks the orientation of the screen
if(newConfig.orientation ==Configuration.ORIENTATION_LANDSCAPE){
Toast.makeText(this,"landscape",Toast.LENGTH_SHORT).show();
}elseif(newConfig.orientation ==Configuration.ORIENTATION_PORTRAIT){
Toast.makeText(this,"portrait",Toast.LENGTH_SHORT).show();
}
}
now onCreate will not be called when orientation.
Try using,
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
//your code
} else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
//your code
}
}
Related
I added this code in my activity
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setContentView(R.layout.activityView);
}
And also added this line in the Manifest file
android:configChanges="orientation|keyboardHidden|screenSize"
The activity is not restarting, but the layout is not correctly loaded : not all componnent are showing and buttons click listner is never called ...
I'm using the same name file for all the layouts. but different content depending on orientation.
I even tried with different names : activityView_port/activityView_land and changed the code to:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
setContentView(R.layout.activityView_port);
} else {
setContentView(R.layout.activityView_land);
}
}
but nothing is working ...
any help would be appreciated :)
setContentView(R.layout.activityView_land);
please dont call above method on configuration change. instead you can try with use some flag for determine what layout has to be set and call reCreate() method.
If don't want to destroy the current instance, better you can try removing and adding of views with animation.
I am turning a view, which is the same but horizontally. which contains many variables of type TextView, progressbar, imageview, etc .. but I can not load the variables when rotated.
I tried to do:
android: configChanges = "keyboardHidden | orientation | ScreenSize | ScreenLayout"
I find methods that can save my customized classes, my progressbar, my views "My nothing."
http://i.imgur.com/A1ugd3W.png
When there anyway to load a landscape (another layout (with the same id's)) of not losing data?
To change the layout I use:
http://developer.android.com/reference/android/app/Activity.html#onConfigurationChanged(android.content.res.Configuration)
Update Code 10/04/2015 (0:45 AM)
My rotation :
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
super.onConfigurationChanged(newConfig);
setContentView(R.layout.activity_1);
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT){
super.onConfigurationChanged(newConfig);
setContentView(R.layout.activity_2);
}
}
Oncreate
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_LANDSCAPE) {
setContentView(R.layout.activity_1);
} else if (getResources().getConfiguration().orientation == Configuration.ORIENTATION_PORTRAIT){
setContentView(R.layout.activity_2);
}
References : Saving Android Activity state using Save Instance State Can't sabe all objects exits of an activity. "I think"
The easiest way would be to not specify orientation for the configChanges. Correspondingly, you will not need to override onConfigurationChanged -- you can simply load the layout in onCreate and state should for the most part be preserved. If needed state data can be stored in onSaveInstanceState (and restored in onCreate).
can you provide your code?
One possible issue is that you might be loading your layout file in onResume instead of onCreate. You need to create the layout in onCreate so the savedInstanceState info gets "injected" back into your app. But again, please provide codes :)
My guess is that elements of your layout don't have the same ID. Also, why don't you just have an XML for certain specifications - one for landscape and one for portrait? I bet Android would behave better if you did that instead of a different name for a different configuration
Well, I wanted to save value of a variable contained in a dialogFragment when the screen is rotated in Android. I've tried every method I could find on the internet, and none of them has worked for me. Some kill my application, and others simply were not doing anything.
I need a real and effective way to save the value of an EditText that is reset when the device screen rotates. The EditText is in a DialogFragment turn this into a FragmentActivity.
thank you very much
Set your fragment's retaingInstance flag to true:
http://developer.android.com/reference/android/app/Fragment.html#setRetainInstance(boolean)
This prevents Fragment instance from being recreated.
Also be sure you don't recreate the fragment all the time:
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
if (savedInstanceState == null) {
Fragment f = new Myfragment();
f.setRetainInstance(true);
getSupportFragmentManager().beginTransaction()
.add(R.id.container, f))
.commit();
}
}
Since View state is preserved during Activity recreation and your are keeping the same Fragment instance you don't need to save TextView value all the time.
I don't know if I understood your question, but you can capture the rotation as follows:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT)
{
//save value
}
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE)
{
//save value
}
}
If you want that your activity don't restart, you should add this into the manifest file:
<activity
.....
android:configChanges="keyboardHidden|orientation|screenSize"
..... >
</activity>
I just found out that you can not apply the methods to save bundles automatically to the dialogues, but these would apply to activities or fragments of these dialogues dependent. If I can fix it by code, will put the solution here. thank you
In my app, I have a FragmentActivity with multiple Fragments all in portrait mode except for one specific Fragment. I move between Fragments through footer Views in the FragmentActivity.
I have a different layout (actually have the same name but different widget Views) for this specific Fragment when there is an orientation change. When in landscape mode, I want to remove specific widgets from the Fragment layout View and the footer View of the FragmentActivity and when back in portrait, add everything back.
I have saved all the data I need in onSavedInstanceState() in the Fragment, but where best should I possibly test for an orientation change so that I can restore the Views appropriately?
Not sure I can override onConfigurationChange() and test there in my Fragment because I don't have the android:configChanges="orientation" in my android Manifest.
Keep this check in onCreate(). When you rotate your device the app is restarted. So onCreate is called again when the app restarts.
int currentOrientation = getResources().getConfiguration().orientation;
if (currentOrientation == Configuration.ORIENTATION_LANDSCAPE) {
// Landscape
}
else {
// Portrait
}
You can control the orientation change by overriding onConfigurationChanged function of your fragment as well.
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
int currentOrientation = getResources().getConfiguration().orientation;
if (currentOrientation == Configuration.ORIENTATION_LANDSCAPE){
Log.v("TAG","Landscape !!!");
}
else {
Log.v("TAG","Portrait !!!");
}
}
I have an activity which handles configuration changes. But now i have to change
layout.I tried in onConfigurationChanged callback just to set again the layout and hoping will get the correct layout(land) but it's still showing
the first layout for portrait view ( there two layout(same name) are placed in res/
layout and res/layout-land :)
if I delete android:configChanges="orientation", it works should be, but ı need to handle onConfigurationChanged. What should I do??
If you have your portrait layout main.xml in /res/layout and your landscape layout main.xml in /res/layout-land, and your onConfigurationChanged() looks like this:
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setContentView(R.layout.main);
...
...
...
}
And in your Manifest you should have android:configChanges="keyboardHidden|orientation"
Then it should work fine, as this does in my app. Is this what you are doing?
// In your activity code.
int mCurrentOrientation;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mfo_offers);
........
mCurrentOrientation = getCurrentOrientation();
}
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// You may handle different configuration changes in your activity which configured in your mainfest.xml, you only need to recreate layout when orientation changes.
if(mCurrentOrientation != newConfig.orientation) {
recreate(); // This recreate the activity if you can properly restore your activity state.
}
......
}
See Activity.recreate() here: http://developer.android.com/reference/android/app/Activity.html#recreate()