Develop Reference

Android SetRequestRotation flips Activity landscape to portrait when auto rotate enabled

I am trying to setRequestOrientation to a portrait but Activity rotates to landscape and set to portrait when auto-rotate enabled.
The Activity will support both landscape and portrait mode.
The problem will happen above Android 7.0.

Try setting the screen orientation to follow the previous set orientation like this
<activity
android:name="com.my.example.MyActivity"
android:screenOrientation="behind" >
</activity>
Set it to behind.

The default android:screenOrientation is unspecified. This means
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.
In some tablets, for example, the default that the system will choose is landscape, so the system may be auto-rotating to landscape as soon as you start the activity, and then flipping from landscape to portrait when you do your setRequestOrientation.
So to prevent the system from behaving this way, you could try choosing the android:screenOrientation for each of those activities in your android manifest like:
<activity
android:name="com.my.example.MyActivity"
android:screenOrientation="locked" >
</activity>
or
<activity
android:name="com.my.example.MyActivity"
android:screenOrientation="behind" >
</activity>
depending on your app requirements. See the Google documentation for more information on these and other options.

Landscape layout file is loaded, while portrait mode is forced. (Android)

I'm currently developing an app, in which phones have forced portrait mode, while tablets support portrait mode as well as landscape mode. Some pages the layouts have respective landscape versions in the layout-land folder.
The problem
While using the app on a phone (so portrait only) and when autorotate on the phone is enabled, the landscape layout file gets loaded while the app is displayed as portrait mode.
When does this occur
To recreate this behaviour I open an activity and rotate the device. Then when I navigate to another activity, or close and open the application, the landscape layout gets loaded.
Method of forcing portrait mode
To force portrait mode on phones, I call
setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
in my BaseActivity onCreate method.
Other details
targetSdkVersion: 26
using support library 26.0.0
Thank you for helping!
Edit 1:
Unfortunately using (a combination of) the following settings in the manifest file gives the same behaviour.
android:screenOrientation="sensorPortrait"
android:screenOrientation="portrait"
android:configChanges="orientation"
Edit 2:
I've now tested on multiple devices (emulator, One plus, Motorola, Samsung and some more) and this oddity only happens on a Samsung A5 (api 23) for me.

Is other Activities are also have that code?
I meant, other Activity that doesn't extends BaseActivity?
I would prefer to set in AndroidManifest.xml file in each activity tag like >> android:screenOrientation="portrait"

add this line android:screenOrientation="portrait" in your project manifest file inside activity. Hope it work well.

Try this
<activity
android:name=".Activity"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/title_activity_test_edit"
android:screenOrientation="sensorPortrait"
android:theme="#style/Theme.DesignDemo"
android:windowSoftInputMode="stateAlwaysHidden" />
Portrait orientation, but can be either normal or reverse portrait based on the device sensor.
Refer this link for more details :
https://developer.android.com/guide/topics/manifest/activity-element.html

As you mentioned,
phones have forced portrait mode, while tablets support portrait mode
as well as landscape mode
Set screen orientation in manifest will not work.
Use layout-land-sw600dp, layout-land-sw720dp folders for landscape view for tablets. Also please take a look at this SO thread

Android Studio - landscape only but still rotate

I want my android studio app to be landscape only, but to switch orientation when the phone is rotated.
This means that when u flip the phone 180°, it will still be landscape but will flip sides. Like the clash of clans game.

You should add the sensorLandscape screenOrientation tag to your activity in the android manifest file and you should be good to go.
android:screenOrientation="sensorLandscape"
Make sure to add this to all the activities that you want to have in landscape mode.

All you need is to go to your AndroidManifest.xml file and under each Activity add the screen orientation tag and set it to sensorLandscape. Make sure you do it for all the other activities if you want them to be in landscape too.
For Example :
<activity
android:name=".MainActivity"
android:label="#string/title_MainActivity"
android:screenOrientation="sensorLandscape">
</activity>

Troubleshoot orientation changing issue

In one of my application, there are multiple Activity(s),
Mostly all activities are configured to be in Landscape orientation by providing android:screenOrientation="sensorLandscape" for each activity
in android manifest file. But one of the activity called 'MyDashBoardActivity' changes orientation to Portrait automatically, when that Activity starts in one of my Android device, but it works fine (Loads in Landscape orientation as expected) in other devices.
How can troubleshoot this issue.

remove this android:screenOrientation="sensorLandscape"
And write In your onCreate :
after setContentView();
setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);

Try myActivity.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);
or
<activity android:screenOrientation="landscape" android:configChanges="orientation|keyboardHidden" android:name="MyDashBoardActivity"/>

Android layout orientation

i have developed an application that works only with a portrait layout.
Actually it has only one layout resource used for all screens.
Now i want that with some screens (especially tablet screens) the layout is different from other devices, and especially i want to use a fixed landscape orientation.
Actually in the manifest i forced the main activity to have portrait orientation:
<activity android:name=".launchActivity"
android:label="#string/app_name" android:screenOrientation="portrait" android:clearTaskOnLaunch="true" android:finishOnTaskLaunch="true">
Now how i can manage to have 2 different "fixed" orientation?
It can be done via xml or i need to handle them programmatically?

Handle it programmatically. use setOrientation method.