Android App orientation change restarts activity - android

I have an activity and it is getting restarted whenever orientation changes. I have written code to prevent activity restart upon change in orientation in the manifest file as given below:
<application
android:allowBackup="true"
android:icon="#mipmap/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.sample.appname.MainActivity"
android:label="#string/app_name"
android:configChanges="orientation|keyboardHidden"
>
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
In the above code snippet android:configChanges="orientation|keyboardHidden" is supposed to do the work for me but the activity is still getting restarted. Please let me know how to correct it.


Actually you shouldn't prevent the Activity to be restarted. It is neccessary to recreate the Activity after a rotation change for several reasons. One of it is that the layout has to be inflated to deal with the changed screen size and things like that (it's easy to imagine that the layout is totally different in portrait than it is in landscape mode).
However, there is a way you can tell the system that you deal with the screen changes by yourself. Therefore change the line in your manifest
android:configChanges="orientation|keyboardHidden"
to
android:configChanges="orientation|screenSize"
The activity won't be recreated then. You'll get a callback via the onConfigurationChanged() method so you can do something when the orientation has changed. If you don't want to do anything when the configuration has changed, just don't override the onConfigurationMethod() in your Activity. Read this section in the Android Developers API Guide for more information.
I got this from this answer. There are two more approaches in the answer but I think the one I described above is the best in your case.
EDIT: Maybe you have to add keyboard|keyboardHidden to the android:configChanges attribute as well, as stated in this answer
EDIT #2: If you want to retrieve the current orientation of the device you can call
Activity.getResources().getConfiguration().orientation
which will return the constants ORIENTATION_PORTRAIT or ORIENTATION_LANDSCAPE.
If you're interested in the exact rotation angle, use
int rotation = getWindowManager().getDefaultDisplay().getRotation();
and implement a differentiation with something like a switch case described here.
And a third way to determine the device's rotation is getRequestedOrientation() which will return a constant defined in the documentation


android:configChanges="orientation|screenSize" means whenever screen orientation will be changed a following method in Activity class will be called.
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if(newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) { body }
}
This is nature of andorid that whenever screen orientation is changed whole lifecycle of activity runs again.
To save and restore some data. you can use following methods.
#Override
public void onSaveInstanceState(Bundle outState, PersistableBundle outPersistentState) {
super.onSaveInstanceState(outState, outPersistentState);
outState.putString("key","value");
}
#Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
String s = savedInstanceState.getString("key");
}


Try changing
android:configChanges="orientation|keyboardHidden"
Into
android:configChanges="orientation|screenSize"
this should solve your problem, but it is not a efficient way, for a better option refer http://developer.android.com/training/basics/activity-lifecycle/recreating.html

Related

Method called BEFORE orientation change

After the orientation changes, this method is called:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
}
But how do I take action BEFORE the guidance change? I need it before it changes, I save some things in SQLite.
Is there any way to do this?

Your activity calls that onCreate() with different execution params in every orientation changes. But you can handle those changes by configuring configChanges tag in the manifest file.
For example, the following manifest code declares an activity that handles both the screen orientation change and keyboard availability change:
<activity android:name=".MyActivity"
android:configChanges="orientation|keyboardHidden"
android:label="#string/app_name">
you can find all the details about this configChanges by navigating this https://developer.android.com/guide/topics/resources/runtime-changes android official documentation.
You can use this knowledge and do what you want when triggering this method while orientation changes.

Prevent Activity restart on rotation

I have an app that uses the below sdk in the manifest:
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="17" />
To prevent the activity from restarting on screen rotation I add to manifest :
android:configChanges="orientation|keyboardHidden|screenSize"
Do I need to override the onConfigurationChanged in activity itself also, as below:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setContentView(R.layout.myLayout);
}
or is this line in the manifest is enough:
android:configChanges="orientation|keyboardHidden|screenSize"
Any help will be appreciated.

To prevent the activity from restarting on screen rotation
That is usually not a very good idea.
I add to manifest : android:configChanges="orientation|keyboardHidden|screenSize"
That is usually even less of a good idea. All you do is create more work for yourself. You still have to have all of the standard configuration change logic, to handle all of the configuration changes that you do not have listed there, plus you may need to deal with these three cases separately.
Do I need to override the onConfigurationChanged
That depends upon whether your UI is different based upon configuration, for the configurations you have listed in android:configChanges (e.g., does portrait look different than landscape?). If the answer is "yes", then onConfigurationChanged() is where you will fix up that UI for the events listed in your android:configChanges roster. If the answer is "no", then you do not need to override this method.

The manifest piece below that you had is enough to prevent the rotation:
android:configChanges="orientation|keyboardHidden|screenSize"

Set
android:screenOrientation="portrait"
as suggested by Android - disable landscape mode?

onConfigurationChanged() not getting called when manifest has manifest orientation tag

I've looked at many of the other posts for this question and the most common solution is to ensure that you have the following in your manifest:
<activity android:name=".activities.myActivity"
android:configChanges="orientation|keyboard|keyboardHidden|screenSize">
This sub is already in my manifest and I'm not forcing my activity' orientation to landscape or portrait yet onConfigurationChanged(...) is not called.
My onConfigureationChanged(...) function is as follows and I am not receiving the logcat output:
#Override
public void onConfigurationChanged(Configuration newConfig) {
Logger.e(getClass().getSimpleName(), "onConfigurationChanged()");
super.onConfigurationChanged(newConfig);
}
I've also verified that the activity is not going through the standard life cycle by adding loggers in onCreate() and onPause().

OnConfigurationChanged will be called only when the specified config in the AndroidManifest.xml change. For instance, this method will be called after a screen orietation change. If i understood, your app's configs are not changing.
From the Android documentation:
For example, the following manifest code declares an activity that handles both the screen orientation change and keyboard availability change:
<activity android:name=".MyActivity"
android:configChanges="orientation|keyboardHidden"
android:label="#string/app_name">
Now, when one of these configurations change, MyActivity does not restart. Instead, the MyActivity receives a call to onConfigurationChanged(). This method is passed a Configuration object that specifies the new device configuration.

Don't reload application when orientation changes

I simply need nothing to change when the screen is rotated. My app displays a random image when it first loads and rotating the device should not select another random image.
How can I (simply) make this behavior stop?

There are generally three ways to do this:
As some of the answers suggested, you could distinguish the cases of your activity being created for the first time and being restored from savedInstanceState. This is done by overriding onSaveInstanceState and checking the parameter of onCreate.
You could lock the activity in one orientation by adding android:screenOrientation="portrait" (or "landscape") to <activity> in your manifest.
You could tell the system that you meant to handle screen changes for yourself by specifying android:configChanges="orientation|screenSize" in the <activity> tag. This way the activity will not be recreated, but will receive a callback instead (which you can ignore as it's not useful for you).
Personally I'd go with (3). Of course if locking the app to one of the orientations is fine with you, you can also go with (2).

Xion's answer was close, but #3 (android:configChanes="orientation") won't work unless the application has an API level of 12 or lower.
In API level 13 or above, the screen size changes when the orientation changes, so this still causes the activity to be destroyed and started when orientation changes.
Simply add the "screenSize" attribute like I did below:
<activity
android:name=".YourActivityName"
android:configChanges="orientation|screenSize">
</activity>
Now, when you change orientation (and screen size changes), the activity keeps its state and onConfigurationChanged() is called. This will keep whatever is on the screen (ie: webpage in a Webview) when the orientation changes.
Learned this from this site:
http://developer.android.com/guide/topics/manifest/activity-element.html
Also, this is apparently a bad practice so read the link below about Handling Runtime Changes:
http://developer.android.com/guide/topics/resources/runtime-changes.html

You just have to go to the AndroidManifest.xml and inside or in your activities labels, you have to type this line of code as someone up there said:
android:configChanges="orientation|screenSize"
So, you'll have something like this:
<activity android:name="ActivityMenu"
android:configChanges="orientation|screenSize">
</activity>
Hope it works!

<activity android:name="com.example.abc"
android:configChanges="orientation|screenSize"></activity>
Just add android:configChanges="orientation|screenSize" in activity tab of manifest file.
So, Activity won't restart when orientation change.

It's my experience that it's actually better to just deal with the orientation changes properly instead of trying to shoehorn a non-default behavior.
You should save the image that's currently being displayed in onSaveInstanceState() and restore it properly when your application runs through onCreate() again.

This solution is by far the best working one. In your manifest file add
<activity
android:configChanges="keyboardHidden|orientation|screenSize"
android:name="your activity name"
android:label="#string/app_name"
android:screenOrientation="landscape">
</activity
And in your activity class add the following code
#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
}
}

In manifiest file add to each activity this. This will help
android:configChanges = "orientation|keyboard|keyboardHidden|screenLayout|screenSize"

add android:configChanges="keyboardHidden|orientation|screenSize" for all the app activities tags in manifest.

Just add this to your AndroidManifest.xml
<activity android:screenOrientation="landscape">
I mean, there is an activity tag, add this as another parameter. In case if you need portrait orientation, change landscape to portrait. Hope this helps.

just use : android:configChanges="keyboardHidden|orientation"

As Pacerier mentioned,
android:configChanges="orientation|screenSize"

All above answers are not working for me. So, i have fixed by mentioning the label with screenOrientation like below. Now everything fine
<activity android:name=".activity.VideoWebViewActivity"
android:label="#string/app_name"
android:configChanges="orientation|screenSize"/>

http://animeshrivastava.blogspot.in/2017/08/activity-lifecycle-oncreate-beating_3.html
#Override
protected void onSaveInstanceState(Bundle b)
{
super.onSaveInstanceState(b);
String str="Screen Change="+String.valueOf(screenChange)+"....";
Toast.makeText(ctx,str+"You are changing orientation...",Toast.LENGTH_SHORT).show();
screenChange=true;
}

Prevent Activity to recreated
Most common solution to dealing with orientation changes by setting the android:configChanges flag on your Activity in AndroidManifest.xml. Using this attribute your Activities won’t be recreated and all your views and data will still be there after orientation change.
<activity
android:name="com.example.test.activity.MainActivity"
android:configChanges="orientation|screenSize|keyboardHidden"/>
this is work for me😊😊😊

Save the image details in your onPause() or onStop() and use it in the onCreate(Bundle savedInstanceState) to restore the image.
EDIT:
More info on the actual process is detailed here http://developer.android.com/reference/android/app/Activity.html#ActivityLifecycle as it is different in Honeycomb than previous Android versions.

I dont know if the a best solution, but i describe it here:
First of all, you need certificate with you class Application of your app is in your manifest of this:
<application
android:name=".App"
...
Second, in my class App i did like this:
public class App extends Application {
public static boolean isOrientationChanged = false;
#Override
public void onCreate() {
super.onCreate();
}
#Override
public void onConfigurationChanged(#NotNull Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE ||
newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
isOrientationChanged = true;
}
}
}
Third, you need to set a flag to Orientation Change, in my case, I always set it when the previous activity within the app navigation is called, so only calling once when the later activity is created.
isOrientationChanged = false;
So every time I change the orientation of my screen in that context, I set it every time it changes this setting, it checks if there is a change in orientation, if so, it validates it based on the value of that flag.
Basically, I had to use it whenever I made an asynchronous retrofit request, which he called every moment that changed orientation, constantly crashing the application:
if (!isOrientationChanged) {
presenter.retrieveAddress(this, idClient, TYPE_ADDRESS);
}
I don't know if it's the most elegant and beautiful solution, but at least here it's functional :)

Add this code after the onCreate ,method in your activity containing the WebView
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
#Override
protected void onRestoreInstanceState(Bundle state) {
super.onRestoreInstanceState(state);
}

How can I keep the MediaRecorder keeps recording after an orientation change

Can you please tell me how can I keep the MediaRecorder keeps recording after an orientation change? I try looking into source code of packages/apps/SoundRecorder/src/com/android/soundrecorder/Recorder.java, I don't see it handles that cases.
Thank you.

This might be because by default the system destroys and recreates the Activity when the orientation changes. You can tell the system that your app handles changes like these by modifying the activity's tag in the manifast like this:
<activity android:name=".UIActivity"
android:configChanges="orientation|keyboardHidden"
android:label="#string/app_name"> ...
</activity>
This way you can react to these changes overriding this method:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
//---code to redraw your activity here---
//...
}
Here, you can redraw your views to support landscape mode, or do simply nothing.

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