【Android】【动画】自定义插值器Interpolator

public class ShakeInterpolator implements Interpolator {    @Override    public float getInterpolation(float timeElapsed) {        if (timeElapsed <= 0.25f)            return timeElapsed / 0.25f;        else if (timeElapsed <= 0.75f)            return 1 - (timeElapsed - 0.25f) / 0.25f;        else            return -1 + (timeElapsed - 0.75f) / 0.25f;    }}

public class ShakeAnimation extends Animation {    private float dx;    private float dy;    public ShakeAnimation(int dx, int dy) {        this.dx = dx;        this.dy = dy;    }    @Override    protected void applyTransformation(float interpolatedValue, Transformation transfer) {        Matrix matrix = transfer.getMatrix();        matrix.postTranslate(interpolatedValue * dx, interpolatedValue * dy);    }    @Override    public void initialize(int width, int height, int parentWidth, int parentHeight) {        setDuration(500);        setFillAfter(true);        setRepeatCount(-1);        setInterpolator(new ShakeInterpolator());    }}

            ShakeAnimation animator = new ShakeAnimation(200, 0);            layout.startAnimation(animator);

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