I'm having a hard time with the screen orientation in Android. I have an activity which captures a signature after the user draws his signature on the device. And for that activity I am passing a parceable object and I get it in oncreate. When the activity changes the orientation sometimes the activity cannot get the parceable object and gives an exception. I tried using a static object for the parceable object but no use. I tried onsaveinstance state method and onRetainNonConfigurationInstance methods as well.
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.signature_capture_view);
Bundle bundle = getIntent().getExtras();
info = bundle.getParcelable("info");
logo= (Bitmap) bundle.get("logo");
}
And my save instance state method is like this;
#Override
protected void onSaveInstanceState(Bundle outState) {
outState.putParcelable("info", info);
super.onSaveInstanceState(outState);
}
From the onconfiguration changed method i call the setcontentview method to set a fresh layout.
#Override
public void onConfigurationChanged(Configuration newConfig) {
setContentView(R.layout.signature_capture_view);
super.onConfigurationChanged(newConfig);
}
Sometimes when the orientation changes an out of memory exception occurs from the setcontentview method.
Any help would be greatly appreciated. Thanks in advance.
Try to set the below android:configChanges attributes inside the AndroidManifest.xml file:
<activity android:name=".MyActivity"
android:label="#string/app_name"
android:configChanges="orientation|keyboardHidden">
And if you wants that your application should be fixed to open either in Portrait or in Landscape mode then add android:screenOrientation inside the activity tag:
<activity android:name=".MyActivity"
android:label="#string/app_name"
android:configChanges="orientation|keyboardHidden"
android:screenOrientation="portrait">
if you are changing the View in landscape / portrait then you should follow these steps to resolve the out of memory error.
set this in the manifest on the activity tag
android:configChanges="orientation"
in Anctivity put
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
this.recreate();
}
Try to set this in the manifest on the activity tag for the out of memory error:
android:configChanges="orientation"
I finally found the answer to my out of memory, In my signature drawing view I did not check the bitmap in the view for null and everytime the device changes the orientation it creates the bitmap inside the view. And it generates the OOM. So i inserted a null check for the bitmap and the oom disappeared. Thanks for the quick replys guys.
Related
I am trying to handle change orientation. I enforce orientation in Manifest:
android:screenOrientation="landscape"
android:configChanges="orientation|screenSize"
Then in Activity I set onConfigurationChanged, but it doesn't work. It doesn't handle the change orientation. When I don't set orientation in Manifest, everything works perfect, but I need landscape when the activity starts.
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
startActivity(
new Intent(GraphActivity.this, MainActivity.class)
.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP));
}
}
Thanks guys
onConfigurationChanged won't be called if you have set fixed orientation in manifest
what if user runs app in portrait? it will start with horizontal layout, then if user still want to be in portrait then he must rotate device to landscape and back again to portrait? your described behavior looks to me like bad UX...
but, answering: there is no "landscape-only-on-start" for screenOrientation... if you really want to program such behavior then you have to use some code, especially setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_HORIZONTAL); method, but probably also some manual orientation calculation (sensor callbacks)
So I'm coding an Android app with Visual Studio. I want a certain Activity with both orientation portrait and landscape. When I turned my device, the data in my Activity disappeared. So I checked on internet and found a line to put in the manifest which keep the data and this worked !
android:configChanges="orientation|keyboardHidden|screenSize"
except that all of my views were in disorder and deplaced.I'm using two different layout. one for the protrait view and the other for the landscape. I want to keep the data end switch the layout, any ideas ?
thanx
override
protected void onSaveInstanceState(Bundle outState)
method and save value in outState variable in key value pair
in
protected void onCreate(Bundle savedInstanceState)
when orientation will chage savedInstanceState variable will have same value which you save in
onSaveInstanceState
Note: when activity will launch first time
protected void onCreate(Bundle savedInstanceState)
savedInstanceState will have null value
Just put this line with activity tag of your Mainfest.xml file
android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"
Final code will be look like:
<activity android:name="com.xyz.myapp.MainActivity" android:label="#string/app_name"
android:configChanges="keyboard|keyboardHidden|screenLayout|screenSize|orientation"/>
My app crashec when rotating the device. I know it crashes because whenI rotate the screen it tries to create new View to draw and display but how can it create the view and display it properly on the launch but crashes when trying to create the second new view?
I dont know what part of my code I should post here? Can you give a clue to solve this problem?
I found something usefull. I put try/catch statement and now when I rotate the device, it doesnt crash but displays a blank page, when I re-rotate to the old position it display the page. here is my code
#Override
protected void onCreate(Bundle savedInstanceState) {
try{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
} catch (Exception e) {
Log.i("my_error", e.getMessage());
}
}
but eclipse cannot catch the exception.
How can I solve this problem?
There are two possible ways to do this:
1) You don't care about the orientation change of the screen and you just want to be "resized". Just add the following properties in your Manifest file:
<activity
android:name=".SplashScreen"
android:configChanges="orientation|keyboardHidden|screenSize" ... />
and add this lines of code in your activity:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// do nothing, just override
}
2) You do care about the orientation change. Then there are a couple of things that you should know about the activity lifecycle in an orientation change.
Firstly the onConfigurationChanged() is called and you should store in a Bundle everything that you need. For example the user has editted an EditText and you should save the value.
Why to do that? Because afterwards the onCreate() method will be called again in order for you to implement a different layout or alter something in the Views. You should then take the previously saved Bundle and restore the variables that you saved in your newly created layout.
Just add the android:configChanges="orientation" to your activity
<activity android:name=".MyActivity"
android:configChanges="orientation"/>
if you given like this, then oncreate will not called if your screen orientation is changed.
If you need more information about this you can check this link
There are a couple of things you can do:
1) Ignore screen orientation changes. If your app is only designed for portrait mode, most likely it won't look good in landscape mode and vice versa. Best is to specify the target orientation in your activities.
2) If you want to allow orientation changes, then you should have written some code re-create the view with different/modified layout. Mind sharing the code with us?
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
//Override this and recreate your view or set adapter here
}
Dont forget to add android:configChanges="orientation" in your manifest.
On a side note you can fix orientation through manifest like this -
android:screenOrientation="portrait"
Add this to your Activity tag in the manifest:
android:configChanges="orientation|screenSize"
This will cause that the activity is not recreated on rotation change.
The flag sreenSize is for newer devices(API level 13 or higher), with including only the orientation flag the activity will stil recreate when rotating on devices running API level 13 or higher.
I saw some related questions on SO, but I'm not able to resolve my issue.
I've created separate layout for PORTRAIT and LANDSCAPE mode.
I've modified the AndroidManifest.xml file for corresponding orientation change but onConfigurationChanged() is not working when I'm implementing it in activity.
Now the issue is at layout.addView(graphView, lp); in onCreate().
I've written absolute hard-coded value in GraphView class.
So it works perfectly foe PORTRAIT mode but graphView is not correctly placed when I switch to LANDSCAPE mode.
To resolve this I've created GraphViewLand class which is coded exclusively for LANDSCAPE mode. But it is not getting called from onConfigurationChanged().
Rest of the layout is coming perfectly as I've created separate main.xml file for each orientation. But since graphView is created programmatically, it is not placed properly.
Am I doing anything wrong here?
I just read this from here:
For any types of configuration changes you say that you handle there, you will receive a call to your current activity's onConfigurationChanged(Configuration) method instead of being restarted. If a configuration change involves any that you do not handle, however, the activity will still be restarted and onConfigurationChanged(Configuration) will not be called.
onCreate() method
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
init();
RelativeLayout layout = (RelativeLayout) findViewById(R.id.MainLayout);
RelativeLayout.LayoutParams lp = new RelativeLayout.LayoutParams(
RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
lp.addRule(RelativeLayout.ALIGN_TOP, btnindex.getId());
GraphView graphView = new GraphView(this, values, "CurrentGraph",
horlabels, verlabels);
layout.addView(graphView, lp);
}
onConfigurationChanged() method
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
Toast.makeText(this, "landscape", Toast.LENGTH_SHORT).show();
Log.v("LAND", "SCPAE");
}
}
Any help appriciated :)
If you create two different types of view (for landscape and portrait) in xml and you have to write logic on different types of view then donot use android:configChanges in manifest.
If you have no android:configChanges in manifest and you have different sets of layout for landscape and portrait then when you change orientation your control will come to onCreate() inside that method you can write your logic.
Did you code onConfigurationChanged as an override in your Activity class?
Basic override:
// Called on rotation.
// Does not call onDestroy anymore due to android:configChanges="keyboardHidden|orientation" in manifest
#Override
public void onConfigurationChanged(Configuration newConfig) {
// TODO Auto-generated method stub
super.onConfigurationChanged(newConfig);
}
My manifest declaration for info:
<activity android:name=".Slime"
android:label="#string/app_name"
android:configChanges="keyboardHidden|orientation"
android:screenOrientation="landscape">
How do you say that the onConfigurationChanged() method is not called? Is the log not being printed? Isn't the toast being shown?
Secondly, you mention that the issue is at layout.addView in onCreate(). Do note that if android:configChanges is present in your manifest, then onCreate() is not called on orientation change. You need to move the piece of code that programmatically modifies the UI layout into the onConfigurationChanged() method.
I realize that there are a couple other posts on this topic, however the solutions for those posts are not working for me.
Basically, I want to cease my Activity from restarting upon a device orientation change. To do this, I have modified the activity in the manifest file:
<activity android:name=".MyActivity" android:configChanges="orientation|keyboardHidden"></activity>
and I have overridden onConfigurationChanged() in my Activity:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
System.out.println("IN onConfigurationChanged()");
}
However, the activity is still restarting upon an orientation change, and the onConfigurationChanged() method is not being called.
Does anyone know why this may be happening?
You should use 13 API and set this configuration in your activity's part of the manifest:
android:configChanges="orientation|keyboardHidden|screenSize"
It works fine. At all Android version.
Change your manifest to following
<activity android:name=".MyActivity" android:configChanges="orientation|keyboardHidden|screenSize"></activity>
and refer this link for detailed explanation orientation issue
The only thing that worked was using getLastNonConfigurationInstance(). http://developer.android.com/reference/android/app/Activity.html#getLastNonConfigurationInstance()
You should not use setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); method call any where in your application this will avoid calling onConfigChanged() method.
if you define configchanges=orientation in your manifest then the activity won't restart but instead onConfigurationChanged will be call as you have currently have it implemented. First try to log that with the log class Log (this is the proper way to log things in android don't use System out for this its considered a bad practice) and before super but that is just a 1% chance it will fix what is happening to you.
The second case is that you have the current activity nested in a tabHost for example or Activity Group. if your activity has a parent activity then configuration change needs to be added in that one and the callback will happen there.
If that is the case and you want to forward the result or also do something in the child then you need to get a reference to the child in the parent and call a method on it for the changes.
if you have a fragment then you need this also:
void setRetainInstance(boolean retain)
Control whether a fragment
instance is retained across Activity re-creation (such as from a
configuration change).
i ran into this and setting it to 'true' fixed it.
I used this, and it helped:
package="com.s2dio.evallet"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="8" />
Modefiy your onConfigurationChanged method to the following
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();
} else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
Toast.makeText(this, "portrait", Toast.LENGTH_SHORT).show();
}
}