Update motion for one-handed bouncer.

         allow it to use the whole screen space, 0.6 will allow it to use just under half of the

         screen. -->

    <item name="half_opened_bouncer_height_ratio" type="dimen" format="float">0.0</item>

    <!-- The actual amount of translation that is applied to the bouncer when it animates from one

         side of the screen to the other in one-handed mode. Note that it will always translate from

         the side of the screen to the other (it will "jump" closer to the destination while the

         opacity is zero), but this controls how much motion will actually be applied to it while

         animating. Larger values will cause it to move "faster" while fading out/in. -->

    <dimen name="one_handed_bouncer_move_animation_translation">120dp</dimen>

</resources>

import static java.lang.Integer.max;

import android.animation.Animator;

import android.animation.AnimatorListenerAdapter;

import android.animation.ValueAnimator;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.Context;

import android.view.WindowInsets;

import android.view.WindowInsetsAnimation;

import android.view.WindowManager;

import android.view.animation.AnimationUtils;

import android.view.animation.Interpolator;

import android.widget.FrameLayout;

import androidx.annotation.VisibleForTesting;

    private static final long IME_DISAPPEAR_DURATION_MS = 125;

    // The duration of the animation to switch bouncer sides.

    private static final long BOUNCER_HANDEDNESS_ANIMATION_DURATION_MS = 500;

    // How much of the switch sides animation should be dedicated to fading the bouncer out. The

    // remainder will fade it back in again.

    private static final float BOUNCER_HANDEDNESS_ANIMATION_FADE_OUT_PROPORTION = 0.2f;

    @VisibleForTesting

    KeyguardSecurityViewFlipper mSecurityViewFlipper;

    private AlertDialog mAlertDialog;

                ? 0 : (int) (getMeasuredWidth() - mSecurityViewFlipper.getWidth());

        if (animate) {

            mRunningOneHandedAnimator =

                    mSecurityViewFlipper.animate().translationX(targetTranslation);

            mRunningOneHandedAnimator.setInterpolator(Interpolators.FAST_OUT_SLOW_IN);

            mRunningOneHandedAnimator.setListener(new AnimatorListenerAdapter() {

                @Override

                public void onAnimationEnd(Animator animation) {

                    mRunningOneHandedAnimator = null;

            // This animation is a bit fun to implement. The bouncer needs to move, and fade in/out

            // at the same time. The issue is, the bouncer should only move a short amount (120dp or

            // so), but obviously needs to go from one side of the screen to the other. This needs a

            // pretty custom animation.

            //

            // This works as follows. It uses a ValueAnimation to simply drive the animation

            // progress. This animator is responsible for both the translation of the bouncer, and

            // the current fade. It will fade the bouncer out while also moving it along the 120dp

            // path. Once the bouncer is fully faded out though, it will "snap" the bouncer closer

            // to its destination, then fade it back in again. The effect is that the bouncer will

            // move from 0 -> X while fading out, then (destination - X) -> destination while fading

            // back in again.

            // TODO(b/195012405): Make this animation properly abortable.

            Interpolator positionInterpolator = AnimationUtils.loadInterpolator(

                    mContext, android.R.interpolator.fast_out_extra_slow_in);

            Interpolator fadeOutInterpolator = Interpolators.FAST_OUT_LINEAR_IN;

            Interpolator fadeInInterpolator = Interpolators.LINEAR_OUT_SLOW_IN;

            ValueAnimator anim = ValueAnimator.ofFloat(0.0f, 1.0f);

            anim.setDuration(BOUNCER_HANDEDNESS_ANIMATION_DURATION_MS);

            anim.setInterpolator(Interpolators.LINEAR);

            int initialTranslation = (int) mSecurityViewFlipper.getTranslationX();

            int totalTranslation = (int) getResources().getDimension(

                    R.dimen.one_handed_bouncer_move_animation_translation);

            final boolean shouldRestoreLayerType = mSecurityViewFlipper.hasOverlappingRendering()

                    && mSecurityViewFlipper.getLayerType() != View.LAYER_TYPE_HARDWARE;

            if (shouldRestoreLayerType) {

                mSecurityViewFlipper.setLayerType(View.LAYER_TYPE_HARDWARE, /* paint= */null);

            }

            anim.addUpdateListener(animation -> {

                float switchPoint = BOUNCER_HANDEDNESS_ANIMATION_FADE_OUT_PROPORTION;

                boolean isFadingOut = animation.getAnimatedFraction() < switchPoint;

                int currentTranslation = (int) (positionInterpolator.getInterpolation(

                        animation.getAnimatedFraction()) * totalTranslation);

                int translationRemaining = totalTranslation - currentTranslation;

                // Flip the sign if we're going from right to left.

                if (mIsSecurityViewLeftAligned) {

                    currentTranslation = -currentTranslation;

                    translationRemaining = -translationRemaining;

                }

                if (isFadingOut) {

                    // The bouncer fades out over the first X%.

                    float fadeOutFraction = MathUtils.constrainedMap(

                            /* rangeMin= */0.0f,

                            /* rangeMax= */1.0f,

                            /* valueMin= */0.0f,

                            /* valueMax= */switchPoint,

                            animation.getAnimatedFraction());

                    float opacity = fadeOutInterpolator.getInterpolation(fadeOutFraction);

                    mSecurityViewFlipper.setAlpha(1f - opacity);

                    // Animate away from the source.

                    mSecurityViewFlipper.setTranslationX(initialTranslation + currentTranslation);

                } else {

                    // And in again over the remaining (100-X)%.

                    float fadeInFraction = MathUtils.constrainedMap(

                            /* rangeMin= */0.0f,

                            /* rangeMax= */1.0f,

                            /* valueMin= */switchPoint,

                            /* valueMax= */1.0f,

                            animation.getAnimatedFraction());

                    float opacity = fadeInInterpolator.getInterpolation(fadeInFraction);

                    mSecurityViewFlipper.setAlpha(opacity);

                    // Fading back in, animate towards the destination.

                    mSecurityViewFlipper.setTranslationX(targetTranslation - translationRemaining);

                }

                if (animation.getAnimatedFraction() == 1.0f && shouldRestoreLayerType) {

                    mSecurityViewFlipper.setLayerType(View.LAYER_TYPE_NONE, /* paint= */null);

                }

            });

            mRunningOneHandedAnimator.setDuration(StackStateAnimator.ANIMATION_DURATION_STANDARD);

            mRunningOneHandedAnimator.start();

            anim.start();

        } else {

            mSecurityViewFlipper.setTranslationX(targetTranslation);

        }

        mDisappearAnimRunning = false;

    }

}