Force an Android activity to always use landscape mode

Question

I am using the Android VNC viewer on my HTC G1  But for some reason  that application is always in landscape mode despite my G1 is in portrait mode  Since the Android VNC viewer is open source  I would like know how is it possible hard code an activity to be  landscape   I would like to change it to respect the phone orientation

User · Answer

In my OnCreate Bundle   I generally do the following   this setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE

User · Answer

Doing it in code is is IMO wrong and even more so if you put it into the onCreate  Do it in the manifest and the  system  knows the orientation from the startup of the app  And this type of meta or top level  guidance  SHOULD be in the manifest  If you want to prove it to yourself set a break in the Activity s onCreate  If you do it in code there it will be called twice   it starts up in Portrait mode then is switched to Landscape  This does not happen if you do it in the manifest

User · Answer

That s it   Long waiting for this fix   I ve an old Android issue about double-start an activity that required  programmatically  landscape mode  setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE   Now Android make Landscape mode on start

User · Answer

A quick and simple solution is for the AndroidManifest xml file  add the following for each activity that you wish to force to landscape mode   android screenOrientation  landscape

User · Answer

For Android 4 0  Ice Cream Sandwich  and later  I needed to add these  besides the landscape value   android configChanges  keyboard keyboardHidden orientation screenLayout uiMode screenSize smallestScreenSize    Using only keyboardHidden orientation would still result in memory leaks and recreation of my activities when pressing the power button

User · Answer

Use the ActivityInfo  android content pm ActivityInfo  in your onCreate method before calling setLayout method like this  this setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE

User · Answer

Add The Following Lines in Activity You need to enter in every Activity for landscape android screenOrientation  quot landscape quot  tools ignore  quot LockedOrientationActivity quot   for portrait android screenOrientation  quot portrait quot  tools ignore  quot LockedOrientationActivity quot    Here The Example of MainActivity  lt  xml version  quot 1 0 quot  encoding  quot utf-8 quot   gt   lt manifest xmlns android  quot http   schemas android com apk res android quot      xmlns tools  quot http   schemas android com tools quot      package  quot org thcb app quot  gt       lt application         android allowBackup  quot true quot          android icon  quot  mipmap ic launcher quot          android label  quot  string app name quot          android roundIcon  quot  mipmap ic launcher round quot          android supportsRtl  quot true quot          android theme  quot  style AppTheme quot  gt            lt activity android name  quot  MainActivity quot              android screenOrientation  quot landscape quot              tools ignore  quot LockedOrientationActivity quot  gt               lt intent-filter gt                   lt action android name  quot android intent action MAIN quot    gt                   lt category android name  quot android intent category LAUNCHER quot    gt               lt  intent-filter gt           lt  activity gt            lt activity android name  quot  MainActivity2 quot              android screenOrientation  quot portrait quot              tools ignore  quot LockedOrientationActivity quot  gt               lt intent-filter gt                   lt action android name  quot android intent action MAIN quot    gt                   lt category android name  quot android intent category LAUNCHER quot    gt               lt  intent-filter gt           lt  activity gt       lt  application gt   lt  manifest gt

User · Answer

Press CTRL F11 to rotate the screen

User · Answer

You can set the same data in your java code as well   myActivity setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE     Other values on ActivityInfo will let you set it back to sensor driven or locked portrait   Personally  I like to set it to something in the Manifest as suggested in another answer to this question and then change it later using the above call in the Android SDK if there s a need

User · Answer

The following is the code which I used to display all activity in landscape mode    lt activity android screenOrientation  landscape            android configChanges  orientation keyboardHidden            android name  abcActivty   gt

User · Answer

use Only android screenOrientation  portrait              tools ignore  LockedOrientationActivity

User · Answer

Looking at the AndroidManifest xml  link   on line 9    lt activity android screenOrientation  landscape  android configChanges  orientation keyboardHidden  android name  VncCanvasActivity  gt    This line specifies the screenOrientation as landscape  but author goes further in overriding any screen orientation changes with configChanges  orientation keyboardHidden    This points to a overridden function in VncCanvasActivity java   If you look at VncCanvasActivity  on line 109 is the overrided function    Override public void onConfigurationChanged Configuration newConfig         ignore orientation keyboard change   super onConfigurationChanged newConfig       The author specifically put a comment to ignore any keyboard or orientation changes     If you want to change this  you can go back to the AndroidManifest xml file shown above  and change the line to    lt activity android screenOrientation  sensor  android name  VncCanvasActivity  gt    This should change the program to switch from portrait to landscape when the user rotates the device   This may work  but might mess up how the GUI looks  depending on how the layout were created   You will have to account for that   Also  depending on how the activities are coded  you may notice that when screen orientation is changed  the values that were filled into any input boxes disappear   This also may have to be handled

User · Answer

You can specify the orientation of an activity in the manifest   See here    lt activity android allowTaskReparenting   true     false                 android screenOrientation   unspecified     user     behind                                          landscape     portrait                                          sensor     nosensor                                               adjustResize    adjustPan    gt

User · Answer

In the manifest    lt activity  android name   YourActivity  android screenOrientation  portrait  android configChanges  orientation screenSize  gt    In your activity   setRequestedOrientation ActivityInfo SCREEN ORIENTATION LANDSCAPE   setContentView R layout your activity layout

User · Answer

Arslan  why do you want to force orientation pro grammatically  though there s already a way in manifest   lt activity android name   youractivityName  android screenOrientation  portrait     gt

User · Answer

This works for Xamarin Android  In OnCreate    RequestedOrientation   Android Content PM ScreenOrientation Landscape

[android] Force an Android activity to always use landscape mode

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