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減速せずに回転し続けるアニメーション

Posted at

以下のアニメーションでも回転し続けるが
1回のアニメーション終了前に、減速してからのリピートになるので
綺麗に同じスピードで回転し続けない

rotate_repleat.xml
<?xml version="1.0" encoding="utf-8"?>

<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:duration="1000"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="360"
    android:fromDegrees="0"
    android:repeatCount="-1"
    >
</rotate>

ということで
上記のアニメーションのInterpolatorにLinearInterpolatorをセットすることで
減速のアニメーションを消しました

RotateAnimation animation = (RotateAnimation) AnimationUtils.loadAnimation(this,R.anim.rotate_repeat);
animation.setInterpolator(new LinearInterpolator());
findViewById(R.id.hoge).startAnimation(animation);

アニメーションxmlのinterpolatorにlinearを入れても同じ結果になりますが
この書き方だとAPIレベル10以下には対応していません

rotate_repleat.xml
<?xml version="1.0" encoding="utf-8"?>

<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@android:interpolator/linear"
    android:duration="1000"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="360"
    android:fromDegrees="0"
    android:repeatCount="-1"
    >
</rotate>

どうしてもxmlで対応する場合は
別のanimation.xmlにlinearInterpolatorを定義して

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

それを参照するとうまく行きます

rotate_repleat.xml
<?xml version="1.0" encoding="utf-8"?>

<rotate xmlns:android="http://schemas.android.com/apk/res/android"
    android:interpolator="@anim/interpolator"
    android:duration="1000"
    android:pivotX="50%"
    android:pivotY="50%"
    android:toDegrees="360"
    android:fromDegrees="0"
    android:repeatCount="-1"
    >
</rotate>
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