Develop Reference

Allow user to Landscape Right and Left without using Auto Rotation

I tried using the SystemChrome to change the orientation and it works for Lock ScreenOrientation. But As i provided two orientation. Application takes the first orientation until user start the Auto Orientation from Setting.
SystemChrome.setPreferredOrientations([
DeviceOrientation.landscapeLeft,
DeviceOrientation.landscapeRight,
]);
Is it possible to allow user to change the orientation without using Auto-Orientation Service ?

It works only with android devices:
add attribute to main activity in AndroidManifest.xml
<activity
android:screenOrientation="sensorLandscape"
...
and now screen retains landscape orientation, but can be either normal or reverse landscape based on the device sensor. The sensor is used even if the user has locked sensor-based rotation.

Hey #Ashish I found one link for you for Orientation functionality and Concept
SystemChrome.setPreferredOrientation

The idea here is using make a sensor plugin to take only the screen orientation landscape info. Sensor will work even user locks the orientation.
https://www.techrepublic.com/article/pro-tip-use-android-sensors-to-detect-orientation-changes/
From the flutter site, put a listener somewhere and take a rotation programmatically by setPreferredOrientations method.
https://master-api.flutter.dev/flutter/services/SystemChrome/setPreferredOrientations.html

How do I prevent my app from rotating /prevent the orientation switch once I lock the screen?

I am trying to prevent myy app orientation to landscape to portrait or vice versa when I lock the screen by clicking screen rotation to off.I saw that once I deselect screen rotation, the entire screen locks up including the screen of the apps I have on my device except for my app where orientation change still triggers landscape portrait recognition even when locked.How do I go around it? DoI need to set something in android manifest to make it work in accordance with the screen rotation ?
Thanks!

You can set either add android:screenOrientation="portrait" or android:screenOrientation="landscape" parameter to your AndroidManifest.xml.
edit:
You can also "lock" screen orientation programmatically using setRequestedOrientation (int requestedOrientation)

If you want to lock orientation when user locks it in the system you need to add android:screenOrientation="user" in your activity tag

Lock screen orientation in android

I would like for my activity not to rotate when the device is turned.
Using
android:screenOrientation="nosensor"
does disable orientation changes, but with one caveat: the activity switches to portrait mode. I just want it to keep the current orientation (e.g., if the screen was in landscape when the activity was started, then stay in landscape mode even when the device is rotated). This is not what "nosensor" seems to be doing. It seems to simply be the exact same behavior as "portrait". Am I using it wrong?
I've tried using setRequestedOrientation( getRequestedOrientation ), but if the current requested orientation is undefined, then my activity is going to rotate. I just want too "lock" the effective screen rotation.

What you can do is to tell Android that you are going to handle the orientation configuration change on your own. You do it by specifying orientation for the android:configChanges attribute of the activity tag.
<activity android:name=".MyActivity"
android:configChanges="orientation"
android:label="#string/app_name">
See this link for more information.
http://developer.android.com/guide/topics/resources/runtime-changes.html#HandlingTheChange
As to why nosensor would not work, is because it's mentioned as below in the documentation.
The orientation is determined without reference to a physical
orientation sensor. The sensor is ignored, so the display will not
rotate based on how the user moves the device. Except for this
distinction, the system chooses the orientation using the same policy
as for the "unspecified" setting.
and as to what unspecified is in the documentation
The default value. The system chooses the orientation. The policy it
uses, and therefore the choices made in specific contexts, may differ
from device to device.

Remove orientation restricitons programmatically

In my manifest I've setup an activity restricted to portrait orientation. But I need to remove this restriction on condition. So, how do I achieve removing orientation restrictions programmatically ?
upd: my present settings are:
<activity
android:name=".activity.MainActivity"
android:label="#string/app_name"
android:theme="#android:style/Theme.NoTitleBar"
android:screenOrientation="portrait"
android:configChanges="orientation">
/**
* Defines whether the device being used is a tablet and if so adds horizontal orientation option.
*/
protected void _updateScreenOrientationModes(){
if(((MyApplication) getApplication())._isTablet == true)
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
}

Whether or not you've set android:screenOrientation in your Manifest, you can programmatically set the orientation with Activity.setRequestedOrientation().
In essence, "removing the restriction" is accomplished by
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED);
after which the Activity will exhibit the default behavior of changing screen orientation when the physical device orientation changes.
It's likely, however, that you want to actually match the current physical device orientation at the same time. I haven't tried it, but I'm pretty sure that if all you did was the above, if the device was physically in a landscape orientation when you did it, then you'd stay in portrait mode until you physically moved the device to portrait and back to landscape.
What I would do is be sure to set android:configChanges="orientation" in your Manifest and override Activity.onConfigurationChanged(), in which you can, according to your condition, either perform the orientation change or cache the orientation. Then whenever your condition changes, you'll have the current physical orientation handy so you can change it at that point if necessary.

Programmatically you can change your screen orientations by using "setRequestedOrientation()"
In your java class write the following code as per your condition required.....
To change to portrait mode, use the ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE constant:
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
To change to portrait mode, use the ActivityInfo.SCREEN_ORIENTATION_PORTRAIT constant:
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);

I'm going to leave my other answer, as it addresses the more general question that you asked. However, in a comment to someone else you said:
I need to allow tablets to have both orientations and handsets only portrait
Your particular case is actually easier than the general case: Remove both android:screenOrientation="portrait" and android:configChanges="orientation" from your Manifest to allow the default behavior. Then, during startup, if the device is a handset, force portrait orientation with
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
A device will obviously never change between being a tablet or a handset at runtime, so you only need to do this once, at startup. Tablets will get the default behavior, so whatever physical orientation the device is in, that's what they'll use. Handsets will be forced into portrait and stay that way.

How to change the device orientation in android?

I am using a android phone for my development of a kiosk system. The handy uses as standard the portrait mode and will switch with the sensors to landscape if I rotate it to my needs. My problem is that this device programmed layout will do many side by side effekts in runtime because it will always switch to portrait and then remembers the sensor orientation and switches back to landscape. This means the implementation of portrait mode is not very comfortable for my development.
Now I saw in the dev tools the configuration app which shows me a device config:
orientation=1
My question is: Which file I have to edit to change the device orientation to standard landscape so that the above app will show me landscape. (phone is rooted)
I want to change global from phone portrait mode to tablet landscape mode and not only a single application!

What you need to do is edit your AndroidManifest.xml file and specify the orientation for your activity, as well as handle orientation changes yourself:
<activity android:name="MyActivity"
android:label="#string/app_name"
...
android:configChanges="orientation|keyboardHidden"
...
android:screenOrientation="landscape">
Then your activity will always run in a landscape mode regardless of the device orientation.
EDIT: If you want programmatically to enable/disable auto-rotation, then you can use this code:
public static void setAutoOrientationEnabled(ContentResolver resolver, boolean enabled)
{
Settings.System.putInt(resolver, Settings.System.ACCELEROMETER_ROTATION, enabled ? 1 : 0);
}
However note that this will affect all applications running on the device.

Hi is this what you are looking for? this would leave the application orientation as landscape.
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

This thread is 5 yrs old - am answering to help someone reached here later..
I guess every ans here talks about application specific orientation change. Here's what you should consider for changing orientation for the full device
Runtime: In /system/build.prop add:-
# Makes portrait only
persist.panel.orientation=90
To add in Build tree: Add same in
device/<vendor>/<processor>/system.prop

if you want to keep the orientation as landscape, add this in your Manifest.xml:
<activity android:name="MyActivity" android:screenOrientation="landscape"></activity>