Android --- Detection of Device Orientation

Suppose you want to detect the orientation of a device. The following code from an exercise on dynamically changing fragments based on orientation --shows you how to do this. See the highlighted text.

 

IDEA == use WindowManger that can retrieve from Activity class using getWindowManager() method and inquire the Display with wm.getDefaultDisplay then get the width and height of the display and if width > height is in landscape mode.

 

Portrait Mode

Landscape Mode

(TO SWITCH orientation in emulator hit Ctrl + F11)

 

 

package grewe.fragments;

import android.app.Activity;
import android.os.Bundle;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.view.Display;
import android.view.WindowManager;

//NOTE toggle between Horizontal and Vertical mode in emulator
// by hitting Cntrl-F11

public class FragmentsActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
     super.onCreate(savedInstanceState);

     //add so that dynamically add fragments1 and 2
     FragmentManager fragmentManager = getFragmentManager();
     FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

     //get the current display info
     WindowManager wm = getWindowManager();
     Display d = wm.getDefaultDisplay();
     if(d.getWidth() > d.getHeight())
          {     //landscape mode display fragment 1
                Fragment1 fragment1 = new Fragment1();
               //adroid.R.id.content refers to the content
               //view of the activity
               fragmentTransaction.replace(android.R.id.content, fragment1);
          }
     else
         {    //portrait --display fragment 2
               Fragment2 fragment2 = new Fragment2();
               fragmentTransaction.replace(android.R.id.content, fragment2);
         }

     fragmentTransaction.commit();
     setContentView(R.layout.main);
}
}