round Orientation - Android User Interface

Android examples for User Interface:Screen Orientation

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Description

round Orientation

Demo Code

/*//ww  w.ja va2s  .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.view.OrientationEventListener;

public class Main {
  public static final int ORIENTATION_HYSTERESIS = 5;

  public static int roundOrientation(int orientation, int orientationHistory) {
    boolean changeOrientation = false;
    if (orientationHistory == OrientationEventListener.ORIENTATION_UNKNOWN) {
      changeOrientation = true;
    } else {
      int dist = Math.abs(orientation - orientationHistory);
      dist = Math.min(dist, 360 - dist);
      changeOrientation = (dist >= 45 + ORIENTATION_HYSTERESIS);
    }
    if (changeOrientation) {
      return ((orientation + 45) / 90 * 90) % 360;
    }
    return orientationHistory;
  }
}

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