how to force an Android app into landscape only or portrait only? [duplicate]

Answer 1

 <activity android:name="Intro"
            android:screenOrientation="portrait"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="com.gmaninc.package.INTRO" />
                <category android:name="android.intent.category.DEFAULT" />
            </intent-filter>
        </activity>

one of the following in each activity in the manifest

android:screenOrientation="portrait"
android:screenOrientation="landscape"

Answer 2

Follow below steps to achieve what you wanted to do..

1. Open Android Manifest file.
2. Set Orientation to Portrait or Landscape

that's it..