get Vertical Motion Direction - Android User Interface

Android examples for User Interface:MotionEvent

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Description

get Vertical Motion Direction

Demo Code

/*// w w  w.  ja  va 2s.  c  om
 * Copyright (C) 2013 nohana, Inc. All rights reserved.
 *
 * 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.MotionEvent;

public class Main{
    private static final float DEFAULT_THRESHOLD = 0.0f;
    /**
     *
     * @param e1
     * @param e2
     * @return
     */
    public static final MotionDirection getVerticalMotionDirection(
            MotionEvent e1, MotionEvent e2) {
        return getVerticalMotionDirection(e1, e2, DEFAULT_THRESHOLD);
    }
    /**
     *
     * @param e1
     * @param e2
     * @param threshold
     * @return the motion direction for the vertical axis.
     */
    public static final MotionDirection getVerticalMotionDirection(
            MotionEvent e1, MotionEvent e2, float threshold) {
        float delta = getVerticalMotionRawDelta(e1, e2);
        return getVerticalMotionDirection(delta, threshold);
    }
    /**
     *
     * @param delta
     * @return
     */
    public static final MotionDirection getVerticalMotionDirection(
            float delta) {
        return getVerticalMotionDirection(delta, DEFAULT_THRESHOLD);
    }
    /**
     *
     * @param delta
     * @param threshold
     * @return
     */
    public static final MotionDirection getVerticalMotionDirection(
            float delta, float threshold) {
        if (threshold < 0) {
            throw new IllegalArgumentException(
                    "threshold should be positive or zero.");
        }
        return delta < -threshold ? MotionDirection.DOWN
                : delta > threshold ? MotionDirection.UP
                        : MotionDirection.FIX;
    }
    /**
     *
     * @param e1
     * @param e2
     * @return
     */
    public static final float getVerticalMotionRawDelta(MotionEvent e1,
            MotionEvent e2) {
        return e2.getRawY() - e1.getRawY();
    }
}

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