Android Open Source - GreenGear Bounce Touch Listener

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Back to project page GreenGear.

License

The source code is released under:

MIT License

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Java Source Code

package com.bradleycurran.viewquery.animation.hc;
//from   w w  w.jav a 2 s.  c o m
import android.animation.TimeInterpolator;
import android.annotation.SuppressLint;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnTouchListener;
import android.view.ViewPropertyAnimator;
import android.view.animation.DecelerateInterpolator;
import android.view.animation.OvershootInterpolator;

@SuppressLint("NewApi")
public class BounceTouchListener implements OnTouchListener {

    private static final float    SCALE_DECEL_FACTOR     = 0.7f;
    private static final float    SCALE_OVERSHOOT_FACTOR = 1.0f;
    private static final float    OVERSHOOT_TENSION      = 10.0f;

    private TimeInterpolator      mDecelerator;

    private OvershootInterpolator mOvershootInterpolator;

    public BounceTouchListener() {
        mDecelerator = new DecelerateInterpolator();
        mOvershootInterpolator = new OvershootInterpolator(OVERSHOOT_TENSION);
    }

    @Override
    public boolean onTouch(View v, MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            ViewPropertyAnimator in = v.animate().setInterpolator(mDecelerator);
            in.scaleX(SCALE_DECEL_FACTOR).scaleY(SCALE_DECEL_FACTOR);
        } else if (event.getAction() == MotionEvent.ACTION_UP) {
            ViewPropertyAnimator in = v.animate().setInterpolator(mOvershootInterpolator);
            in.scaleX(SCALE_OVERSHOOT_FACTOR).scaleY(SCALE_OVERSHOOT_FACTOR);
        }

        return false;
    }
}

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