How can i create left to right and then inverse animation in android?

Question

How can I create one animation which always translates from left to right and then if animation stops it turns the other way and translates from right to left. I can create Translate animation in xml and programatically too.

Answer 1

Create this xml, it will translate from left to right and from right to left.

/res/anim/translate.xml

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

    <translate
        android:interpolator="@android:anim/linear_interpolator"
        android:fromXDelta="0%p"
        android:toXDelta="10%p"
        android:duration="2000"
        android:startOffset="0" />

    <translate
        android:interpolator="@android:anim/linear_interpolator"
        android:fromXDelta="10%p"
        android:toXDelta="-10%p"
        android:duration="2000"
        android:startOffset="2000" />

</set>

Suppose you want to apply this animation to an image then write the code below in your class file.

ImageView image = (ImageView)findViewById(R.id.imageView1);
Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), R.anim.translate);
image.startAnimation(animation);

Edit:

If you want your animation to repeat infinitely add the following attributes to the translate tag.

android:repeatCount="infinite"
android:repeatMode="restart"