Android not detecting when device rotated

Question

I am trying to start a new activity when an Android device is rotated, but I don;t even seem to be detecting the rotation in the emulator.

I've read the thread at Android: listen for Orientation change? and that all seems to amke sense, but its just not working.

In my manifest I have:

 <activity android:name=".MainActivity" android:configChanges="orientation|screenSize" android:screenOrientation="portrait" android:windowSoftInputMode="stateHidden"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>

and in my mainActivity.java I have:

@Override public void onConfigurationChanged (Configuration newConfig) { super.onConfigurationChanged(newConfig); int orientation=newConfig.orientation; switch(orientation) { case Configuration.ORIENTATION_LANDSCAPE: showMessage("landscape"); break; case Configuration.ORIENTATION_PORTRAIT: showMessage("portrait"); break; } }

This obviously won't start the new Activity, but I am trying to get the orientation detection working first (showMessage just calls a Toast and is working elsewhere in my code, so that's not why I am not seeing anything).

When I run this in the emulator and use the rotate buttons, the emulator rotates as expected but I never see the Toast...

Where am I going wrong? (I am importing android.content.res.Configuration as required for the Configuration constants).

Vasyl Glodan · Accepted Answer · 2017-09-01 16:12:56Z

onConfigurationChanged method will not be invoked when you rotate your device, actually, nothing will be invoked because of this line:

android:screenOrientation="portrait"

device is just locked in a portrait mode, remove this line, and onConfigurationChanged method should be invoked.

If you want to detect that device is rotated and keep android:screenOrientation="portrait" line you can use accelerometer sensor.

Ah.. I did wonder about that, but if I remove it will Android rotate the first Activity before it has a chance to start the second one?
@FatMonk It will happen simultaneously, first activity will be rotated and the second one will be launched at the same moment.
@VasylGlodan do you have a snippet to use the accelerometer sensor to detect rotation?

Pang · Accepted Answer · 2017-09-02 03:23:29Z

Try after removing this lines

android:configChanges="orientation|screenSize" android:screenOrientation="portrait"

because you are locking screen orientation in manifest and you are also overriding on config change in activity.

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