fix scroll jittering
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yausername
parent
5d9b5a063b
commit
0593aaa0c1
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@ -1,116 +1,80 @@
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package android.support.design.widget;
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import android.animation.ValueAnimator;
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import android.content.Context;
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import android.support.annotation.NonNull;
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import android.support.design.animation.AnimationUtils;
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import android.support.annotation.Nullable;
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import android.util.AttributeSet;
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import android.view.View;
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import android.view.MotionEvent;
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import android.widget.OverScroller;
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// check this https://github.com/ToDou/appbarlayout-spring-behavior/blob/master/appbarspring/src/main/java/android/support/design/widget/AppBarFlingFixBehavior.java
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import java.lang.reflect.Field;
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// check this https://stackoverflow.com/questions/56849221/recyclerview-fling-causes-laggy-while-appbarlayout-is-scrolling/57997489#57997489
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public final class FlingBehavior extends AppBarLayout.Behavior {
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private ValueAnimator mOffsetAnimator;
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private static final int MAX_OFFSET_ANIMATION_DURATION = 600; // ms
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public FlingBehavior() {
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}
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public FlingBehavior(Context context, AttributeSet attrs) {
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super(context, attrs);
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}
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@Override
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public void onNestedPreScroll(CoordinatorLayout coordinatorLayout, AppBarLayout child, View target, int dx, int dy, int[] consumed, int type) {
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if (dy != 0) {
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int val = child.getBottom();
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if (val != 0) {
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int min, max;
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if (dy < 0) {
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// We're scrolling down
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} else {
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// We're scrolling up
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if (mOffsetAnimator != null && mOffsetAnimator.isRunning()) {
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mOffsetAnimator.cancel();
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}
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min = -child.getUpNestedPreScrollRange();
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max = 0;
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consumed[1] = scroll(coordinatorLayout, child, dy, min, max);
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}
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public boolean onInterceptTouchEvent(CoordinatorLayout parent, AppBarLayout child, MotionEvent ev) {
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switch (ev.getActionMasked()) {
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case MotionEvent.ACTION_DOWN:
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// remove reference to old nested scrolling child
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resetNestedScrollingChild();
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// Stop fling when your finger touches the screen
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stopAppBarLayoutFling();
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break;
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default:
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break;
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}
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return super.onInterceptTouchEvent(parent, child, ev);
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}
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@Nullable
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private OverScroller getScrollerField() {
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try {
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Class<?> headerBehaviorType = this.getClass().getSuperclass().getSuperclass().getSuperclass();
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if (headerBehaviorType != null) {
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Field field = headerBehaviorType.getDeclaredField("scroller");
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field.setAccessible(true);
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return ((OverScroller) field.get(this));
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}
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} catch (NoSuchFieldException | IllegalAccessException e) {
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// ?
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}
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return null;
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}
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@Nullable
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private Field getLastNestedScrollingChildRefField() {
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try {
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Class<?> headerBehaviorType = this.getClass().getSuperclass().getSuperclass();
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if (headerBehaviorType != null) {
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Field field = headerBehaviorType.getDeclaredField("lastNestedScrollingChildRef");
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field.setAccessible(true);
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return field;
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}
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} catch (NoSuchFieldException e) {
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// ?
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}
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return null;
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}
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private void resetNestedScrollingChild(){
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Field field = getLastNestedScrollingChildRefField();
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if(field != null){
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try {
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Object value = field.get(this);
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if(value != null) field.set(this, null);
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} catch (IllegalAccessException e) {
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// ?
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}
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}
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}
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@Override
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public boolean onNestedPreFling(@NonNull CoordinatorLayout coordinatorLayout, @NonNull AppBarLayout child, @NonNull View target, float velocityX, float velocityY) {
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if (velocityY != 0) {
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if (velocityY < 0) {
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// We're flinging down
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int val = child.getBottom();
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if (val != 0) {
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final int targetScroll =
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+child.getDownNestedPreScrollRange();
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animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY);
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}
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} else {
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// We're flinging up
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int val = child.getBottom();
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if (val != 0) {
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final int targetScroll = -child.getUpNestedPreScrollRange();
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if (getTopBottomOffsetForScrollingSibling() > targetScroll) {
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animateOffsetTo(coordinatorLayout, child, targetScroll, velocityY);
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}
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}
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}
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}
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return super.onNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY);
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private void stopAppBarLayoutFling() {
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OverScroller scroller = getScrollerField();
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if (scroller != null) scroller.forceFinished(true);
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}
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private void animateOffsetTo(final CoordinatorLayout coordinatorLayout,
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final AppBarLayout child, final int offset, float velocity) {
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final int distance = Math.abs(getTopBottomOffsetForScrollingSibling() - offset);
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final int duration;
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velocity = Math.abs(velocity);
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if (velocity > 0) {
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duration = 3 * Math.round(1000 * (distance / velocity));
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} else {
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final float distanceRatio = (float) distance / child.getHeight();
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duration = (int) ((distanceRatio + 1) * 150);
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}
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animateOffsetWithDuration(coordinatorLayout, child, offset, duration);
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}
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private void animateOffsetWithDuration(final CoordinatorLayout coordinatorLayout,
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final AppBarLayout child, final int offset, final int duration) {
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final int currentOffset = getTopBottomOffsetForScrollingSibling();
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if (currentOffset == offset) {
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if (mOffsetAnimator != null && mOffsetAnimator.isRunning()) {
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mOffsetAnimator.cancel();
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}
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return;
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}
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if (mOffsetAnimator == null) {
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mOffsetAnimator = new ValueAnimator();
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mOffsetAnimator.setInterpolator(AnimationUtils.DECELERATE_INTERPOLATOR);
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mOffsetAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
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@Override
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public void onAnimationUpdate(ValueAnimator animator) {
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setHeaderTopBottomOffset(coordinatorLayout, child,
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(Integer) animator.getAnimatedValue());
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}
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});
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} else {
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mOffsetAnimator.cancel();
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}
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mOffsetAnimator.setDuration(Math.min(duration, MAX_OFFSET_ANIMATION_DURATION));
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mOffsetAnimator.setIntValues(currentOffset, offset);
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mOffsetAnimator.start();
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}
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}
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