Make bounce animation | 易学教程

问题

I would like to do bounce animation of layer.

I have done that layer comes from right to center, now I would like to move it a little back and then back to center. That would create bounce effect.

I was thinking that I can do it with a translate like this:

<translate
    android:duration="900"
    android:fromXDelta="100%p"
    android:toXDelta="0%p" />

<translate
    android:duration="900"
    android:fromXDelta="0%p"
    android:toXDelta="100%p" />

<translate
    android:duration="900"
    android:fromXDelta="70%p"
    android:toXDelta="0%p" />

Well this code does not working, only thing I can achieve is that Layer comes from left to center, and then animation stops.

I cannot use this code: because it does not achieve what I want

setInterpolator(AnimationUtils.loadInterpolator(this,
                        android.R.anim.bounce_interpolator));

Any help would be appreciated.

回答1:

You can use the BounceInterpolator to have this effect. The docs contain a very good description how to use it in XML. Just have a animation xml like this:

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"

    android:interpolator="@android:anim/bounce_interpolator">

    <!-- Use your working translate animation here-->
    <translate
        android:duration="900"
        android:fromXDelta="100%p"
        android:toXDelta="0%p" />
</set>

回答2:

use this xml

<?xml version="1.0" encoding="utf-8"?>
<set xmlns:android="http://schemas.android.com/apk/res/android"
    android:fillAfter="true"
    android:interpolator="@android:anim/bounce_interpolator">

    <scale
        android:duration="600"
        android:fromXScale="1.0"
        android:fromYScale="0.0"
        android:toXScale="1.0"
        android:toYScale="1.0" />

</set>

This will show bounce effect with scale ,different from translate,(fits better in some situations),for more check THIS out..

回答3:

Add code on button or image click

    final Animation myAnim = AnimationUtils.loadAnimation(getActivity(), R.anim.bounce);
    // Use bounce interpolator with amplitude 0.1 and frequency 15
    MyBounceInterpolator interpolator = new MyBounceInterpolator(0.1, 15);
    myAnim.setInterpolator(interpolator);
    imgVoiceSearch.startAnimation(myAnim);

Add this class

public class MyBounceInterpolator implements android.view.animation.Interpolator {
private double mAmplitude = 1;
private double mFrequency = 10;

public MyBounceInterpolator(double amplitude, double frequency) {
    mAmplitude = amplitude;
    mFrequency = frequency;
}

public float getInterpolation(float time) {
    return (float) (-1 * Math.pow(Math.E, -time / mAmplitude) *
            Math.cos(mFrequency * time) + 1);
}
}

来源：https://stackoverflow.com/questions/23937748/make-bounce-animation

标签

android

android-animation