how to stop activity recreation on screen orientation? - android

how i can stop the restarting or recalling of on create() on screen orientation ,i want to stop the recreation of activity on screen orientation. thanks in advance please tell me any better solution its really creating a problem. like in my program i am selecting some picture but on screen orientation the image goes off so thats why i want to stop the recreation of activity on screen orientation.
enter code here
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.mainwindow);
Toast.makeText(getApplicationContext(),"a", 1).show();
bitmap = (Bitmap)getLastNonConfigurationInstance();
//Toast.makeText(getApplicationContext(),"a1", 1).show();
if (savedInstanceState != null)
{
bitmap=BitmapFactory.decodeFile(mImageCaptureUri.getPath());
Toast.makeText(getApplicationContext(),"preview have value", 1).show();
preview.setVisibility(View.VISIBLE);
From_Folder.setVisibility(View.GONE);
From_Camera.setVisibility(View.GONE);
preview.setImageBitmap(bitmap);
}


Up to API 13 there was a new value to the configChanges attribute, screenSize
So if you're using large screens make sure to add screenSize in your configChanges attribute:
android:configChanges="orientation|keyboardHidden|screenSize"


This is happening because when screen orientation rotates the Activity gets re-started. In this case you can add configChanges attribute in your tag in the AndroidManifest file to stop the re-creation of the Activity.
<activity android:name=".Activity_name"
android:configChanges="orientation|keyboardHidden">
By, this also it won't stop though the orientation changes.
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
if(newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE){
setContentView(R.layout.login_landscape);
}
else if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
setContentView(R.layout.login);
}
}


In your AndroidManifest.xml file, in the activity add
android:configChanges="keyboardHidden|orientation"
Example as below:
<activity android:name=".YourActivity" android:label="#string/app_name" android:configChanges="keyboardHidden|orientation">


Not the best, but maybe the easiest solution is to add
android:configChanges="keyboardHidden|orientation"
to youractivity in your manifest so it looks like
<activity android:name="com.your.activity"
android:configChanges="keyboardHidden|orientation"/>


There are a more full list of parameters for prevent activity recreations (in Manifest.xml):
<activity
android:name = ".MyActivity"
android:configChanges = "orientation|keyboard|keyboardHidden|screenLayout|screenSize">
</activity>


Two ways for this:
Either you can set android:configChanges="keyboardHidden|orientation" in Manifest file to avoid recreation of activity.
Or
Make the changes you want to apply on changing the orientation inside the overrided method
#Override
public void onConfigurationChanged(Configuration newConfig) {
// Perform the actions
super.onConfigurationChanged(newConfig);
}


Add
android:orientation="vertical"
or
android:orientation="horizontal"
to your layout in mainwindow.xml.
Example:::
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent">
No need to add anything in Activity class.
Hope this may help you

Related

Android App orientation change restarts activity

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

Change screen orientation in Android without reloading the activity

I want to change the orientation programmatically while running my Android App, with these lines of code:
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_SENSOR_LANDSCAPE);
They work so far, but the main problem is that the whole activity is reloaded when the screen orientation changes, and I don't want that. Is it possible? Thanks.
EDIT: OK, after I while I found out what I was missing. I had to include also "screenSize" in the configChanges property, so having
android:configChanges="orientation|screenSize"
solved the whole thing.

See the edit by #luisfer. For targeting Android 3.2 and above, you need BOTH
android:configChanges="orientation|screenSize"
http://developer.android.com/guide/topics/resources/runtime-changes.html#HandlingTheChange

You need to override onSaveInstanceState(Bundle savedInstanceState) and write the application state values you want to change to the Bundle parameter

In AndroidManifest file add android:configChanges="orientation" for the activity you want to handle this orientation
In activity use onConfigurationChange overrided method. Do task you want to handle in orientation change.

Ansewered here:
Android, how to not destroy the activity when I rotate the device?
Add:
android:configChanges="orientation"
To your androidmanifest.
see:
http://developer.android.com/guide/topics/manifest/activity-element.html#config

Call this method And Set manifest file
android:configChanges="orientation|screenSize|keyboardHidden"
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();
}
}

How to stop sensor in slider phone in android?

I developed an application in which I don't want sensor.
For that I use,
android:screenOrientation="nosensor" in manifest file.
But, In sliding devices when I open slider It doesn't work. So please give me some solution for that.

You can look at the android:configChanges attribute. By calling android:configChanges="keyboardHidden" you can handle keyboard changes yourself (through the onConfigurationChanged method).

Add the configChanges and catch them using onConfigurationChanged
<activity
android:name=".ABC"
android:configChanges="orientation|keyboardHidden|screenSize"
>
</activity>
configuration change function overridden:
#Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
setContentView(R.layout.main);
}
Add all three and check it. screenSize is added from API13 and is required to catch the slider orientation change.

I want the Activity to be fininshed in onConfigurationChanged()

I have an Activity which I want to be finished when user rotates the device.
Here is my code snippet I'm using:
#Override
public void onConfigurationChanged(Configuration newConfig)
{
super.onConfigurationChanged(newConfig);
Log.d("Orientation Changed", "Orientation Changed");
this.finish();
}
and in my Menifist.xml I've added the attribute like this.
<activity android:name=".DetailActivity" android:configChanges="keyboardHidden|orientation" android:screenOrientation="landscape"></activity>
but this.finish() is not called when Orientation is changed.
Further I've started this Activity through Orientation Changed of the Activity prior to it.
Any help or suggestion will be appreciated.
Cheers!

The android:screenOrientation="landscape" bit is your problem. This will make your Activity always be in landscape mode.

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);
}

Categories

Resources