Android animation interpolator: AcceletateDecelerate

Posted 2022-09-30 petewell

android animation interpolator: AcceletateDecelerate

AccelerateDecelerate:

y = cos((t+1)π)/2+0.5

可让动画看起来较平顺，系统默认的interpolator也是AcceletateDecelerate

Demo:

Source:

public class AccelerateDecelerateInterpolator extends BaseInterpolator implements NativeInterpolatorFactory 
    public AccelerateDecelerateInterpolator() 
    

    @SuppressWarnings("UnusedDeclaration")
    public AccelerateDecelerateInterpolator(Context context, AttributeSet attrs) 
    

    public float getInterpolation(float input) 
        return (float)(Math.cos((input + 1) * Math.PI) / 2.0f) + 0.5f;
        // y = cos((t + 1)Math.PI)/2 + 0.5
    

    @Override
    public long createNativeInterpolator() 
        return NativeInterpolatorFactoryHelper.createAccelerateDecelerateInterpolator();
    

原文:大专栏  Android animation interpolator: AcceletateDecelerate