Here you can find the source of getDisplayRotation(Activity activity)
public static int getDisplayRotation(Activity activity)
/*//w ww . java2 s .c om * Copyright (C) 2009 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ import android.app.Activity; import android.app.AlertDialog; import android.app.admin.DevicePolicyManager; import android.content.ActivityNotFoundException; import android.content.ComponentName; import android.content.ContentResolver; import android.content.Context; import android.content.DialogInterface; import android.content.Intent; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.Matrix; import android.graphics.Point; import android.graphics.Rect; import android.graphics.RectF; import android.hardware.Camera; import android.hardware.Camera.CameraInfo; import android.hardware.Camera.Parameters; import android.hardware.Camera.Size; import android.location.Location; import android.net.Uri; import android.os.Handler; import android.os.ParcelFileDescriptor; import android.telephony.TelephonyManager; import android.util.DisplayMetrics; import android.util.Log; import android.util.TypedValue; import android.view.Display; import android.view.OrientationEventListener; import android.view.Surface; import android.view.View; import android.view.WindowManager; import android.view.animation.AlphaAnimation; import android.view.animation.Animation; import android.widget.Toast; import com.android.camera.CameraActivity; import com.android.camera.CameraDisabledException; import com.android.camera.CameraHolder; import com.android.camera.CameraManager; import com.android.camera.util.IntentHelper; import com.android.camera2.R; import java.io.Closeable; import java.io.IOException; import java.lang.reflect.Method; import java.text.SimpleDateFormat; import java.util.Date; import java.util.List; import java.util.Locale; import java.util.StringTokenizer; public class Main{ public static int getDisplayRotation(Activity activity) { int rotation = activity.getWindowManager().getDefaultDisplay() .getRotation(); switch (rotation) { case Surface.ROTATION_0: return 0; case Surface.ROTATION_90: return 90; case Surface.ROTATION_180: return 180; case Surface.ROTATION_270: return 270; } return 0; } }