ALBERT SITE

1. 세로모드 유지형

android:screenOrientation="portrait" 
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2. 가로모드 유지형

android:screenOrientation="landscape"
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3. 모드변환시 자동적으로 

AndroidManifest.xml 에서 android:configChanges="keyboardHidden|orientation|screenSize" 설정

@Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) { Toast.makeText(MainActivity.this, "세로모드", 3000).show(); } else { Toast.makeText(MainActivity.this, "가로모드", 3000).show(); } }