Android-- set a fixed horizontal and vertical screen

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If you want a fixed horizontal and vertical screen activity, set the following 

Set in AndroidManifest.xml:

android: screenOrientation = "portrait" is always displayed in a vertical screen 
       android: screenOrientation = "landscape" is always displayed in landscape

<activity android:name=".MainActivity"
          android:screenOrientation="portrait">// android:screenOrientation="landscape"

</activity>

In an Activity: 

      Activity.this.setRequestedOrientation (ActivityInfo.SCREEN_ORIENTATION_PORTRAIT); display to portrait

       Activity.this.setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_LANDSCAPE);以横屏显示