天津手网站开发,静态网站建设参考文献,wordpress 功能介绍,济南网站制作策划最近发现很多app都使用了三段式滑动#xff0c;比如说高德的首页和某宝等物流信息都是使用的三段式滑动方式#xff0c;谷歌其实给了我们很好的2段式滑动#xff0c;就是BottomSheet#xff0c;所以这次我也是在这个原理基础上做了一个小小的修改来实现我们今天想要的效果。…最近发现很多app都使用了三段式滑动比如说高德的首页和某宝等物流信息都是使用的三段式滑动方式谷歌其实给了我们很好的2段式滑动就是BottomSheet所以这次我也是在这个原理基础上做了一个小小的修改来实现我们今天想要的效果。
高德的效果 实现的效果 我们实现的效果和高德差距不是很大也很顺滑。具体实现其实就是集成CoordinatorLayout.Behavior
//
// Source code recreated from a .class file by IntelliJ IDEA
// (powered by Fernflower decompiler)
//package com.zwl.mybehaviordemo.gaode;import android.annotation.SuppressLint;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Build.VERSION;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.util.TypedValue;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewGroup.LayoutParams;
import android.view.ViewParent;import androidx.annotation.NonNull;
import androidx.annotation.RestrictTo;
import androidx.annotation.RestrictTo.Scope;
import androidx.annotation.VisibleForTesting;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import androidx.coordinatorlayout.widget.CoordinatorLayout.Behavior;
import androidx.core.math.MathUtils;
import androidx.core.view.ViewCompat;
import androidx.customview.view.AbsSavedState;
import androidx.customview.widget.ViewDragHelper;
import androidx.customview.widget.ViewDragHelper.Callback;import com.zwl.mybehaviordemo.R;import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.ref.WeakReference;
import java.util.HashMap;
import java.util.Map;/*** 高德首页滑动效果** author yixiaolunhui*/
public class GaoDeBottomSheetBehaviorV extends View extends CoordinatorLayout.BehaviorV {public static final int STATE_DRAGGING 1;public static final int STATE_SETTLING 2;public static final int STATE_EXPANDED 3;public static final int STATE_COLLAPSED 4;public static final int STATE_HIDDEN 5;public static final int STATE_HALF_EXPANDED 6;public static final int PEEK_HEIGHT_AUTO -1;private static final float HIDE_THRESHOLD 0.5F;private static final float HIDE_FRICTION 0.1F;public static final int MIDDLE_HEIGHT_AUTO -1;private boolean fitToContents true;private float maximumVelocity;private int peekHeight;private boolean peekHeightAuto;private int peekHeightMin;private int lastPeekHeight;int fitToContentsOffset;int halfExpandedOffset;int collapsedOffset;boolean hideable;private boolean skipCollapsed;int state STATE_COLLAPSED;ViewDragHelper viewDragHelper;private boolean ignoreEvents;private int lastNestedScrollDy;private boolean nestedScrolled;int parentHeight;WeakReferenceV viewRef;WeakReferenceView nestedScrollingChildRef;private GaoDeBottomSheetBehavior.BottomSheetCallback callback;private VelocityTracker velocityTracker;int activePointerId;private int initialY;boolean touchingScrollingChild;private MapView, Integer importantForAccessibilityMap;private final Callback dragCallback;private int mMiddleHeight;private boolean mMiddleHeightAuto;public GaoDeBottomSheetBehavior() {this.dragCallback new NamelessClass_1();}public GaoDeBottomSheetBehavior(Context context, AttributeSet attrs) {super(context, attrs);this.dragCallback new NamelessClass_1();TypedArray a context.obtainStyledAttributes(attrs, R.styleable.BottomSheetBehavior_Layout);TypedValue value a.peekValue(R.styleable.BottomSheetBehavior_Layout_behavior_peekHeight);if (value ! null value.data -1) {this.setPeekHeight(value.data);} else {this.setPeekHeight(a.getDimensionPixelSize(R.styleable.BottomSheetBehavior_Layout_behavior_peekHeight, -1));}this.setHideable(a.getBoolean(R.styleable.BottomSheetBehavior_Layout_behavior_hideAble, false));this.setFitToContents(a.getBoolean(R.styleable.BottomSheetBehavior_Layout_behavior_fitToContents, true));this.setSkipCollapsed(a.getBoolean(R.styleable.BottomSheetBehavior_Layout_behavior_skipCollapse, false));setMiddleHeight(a.getDimensionPixelSize(R.styleable.BottomSheetBehavior_Layout_behavior_middleHeight, MIDDLE_HEIGHT_AUTO));a.recycle();ViewConfiguration configuration ViewConfiguration.get(context);this.maximumVelocity (float) configuration.getScaledMaximumFlingVelocity();}class NamelessClass_1 extends Callback {NamelessClass_1() {}Overridepublic boolean tryCaptureView(NonNull View child, int pointerId) {if (GaoDeBottomSheetBehavior.this.state STATE_DRAGGING) {return false;} else if (GaoDeBottomSheetBehavior.this.touchingScrollingChild) {return false;} else {if (GaoDeBottomSheetBehavior.this.state 3 GaoDeBottomSheetBehavior.this.activePointerId pointerId) {View scroll (View) GaoDeBottomSheetBehavior.this.nestedScrollingChildRef.get();if (scroll ! null scroll.canScrollVertically(-1)) {return false;}}return GaoDeBottomSheetBehavior.this.viewRef ! null GaoDeBottomSheetBehavior.this.viewRef.get() child;}}Overridepublic void onViewPositionChanged(NonNull View changedView, int left, int top, int dx, int dy) {GaoDeBottomSheetBehavior.this.dispatchOnSlide(top);}Overridepublic void onViewDragStateChanged(int state) {if (state 1) {GaoDeBottomSheetBehavior.this.setStateInternal(STATE_DRAGGING);}}Overridepublic void onViewReleased(NonNull View releasedChild, float xvel, float yvel) {int top;byte targetState;int currentTop;if (yvel 0.0F) {if (GaoDeBottomSheetBehavior.this.fitToContents) {currentTop releasedChild.getTop();if (currentTop (collapsedOffset HIDE_THRESHOLD) currentTop halfExpandedOffset) {top GaoDeBottomSheetBehavior.this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;} else {top GaoDeBottomSheetBehavior.this.fitToContentsOffset;targetState STATE_EXPANDED;}} else {currentTop releasedChild.getTop();if (currentTop GaoDeBottomSheetBehavior.this.halfExpandedOffset) {top GaoDeBottomSheetBehavior.this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;} else {top 0;targetState STATE_EXPANDED;}}} else if (!GaoDeBottomSheetBehavior.this.hideable || !GaoDeBottomSheetBehavior.this.shouldHide(releasedChild, yvel) || releasedChild.getTop() GaoDeBottomSheetBehavior.this.collapsedOffset Math.abs(xvel) Math.abs(yvel)) {if (yvel ! 0.0F Math.abs(xvel) Math.abs(yvel)) {currentTop releasedChild.getTop();if (currentTop halfExpandedOffset) {top GaoDeBottomSheetBehavior.this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;} else {top GaoDeBottomSheetBehavior.this.collapsedOffset;targetState STATE_COLLAPSED;}} else {currentTop releasedChild.getTop();if (GaoDeBottomSheetBehavior.this.fitToContents) {if (Math.abs(currentTop - GaoDeBottomSheetBehavior.this.fitToContentsOffset) Math.abs(currentTop - GaoDeBottomSheetBehavior.this.collapsedOffset)) {top GaoDeBottomSheetBehavior.this.fitToContentsOffset;targetState STATE_EXPANDED;} else {top GaoDeBottomSheetBehavior.this.collapsedOffset;targetState STATE_COLLAPSED;}} else if (currentTop GaoDeBottomSheetBehavior.this.halfExpandedOffset) {if (currentTop Math.abs(currentTop - GaoDeBottomSheetBehavior.this.collapsedOffset)) {top 0;targetState STATE_EXPANDED;} else {top GaoDeBottomSheetBehavior.this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;}} else if (Math.abs(currentTop - GaoDeBottomSheetBehavior.this.halfExpandedOffset) Math.abs(currentTop - GaoDeBottomSheetBehavior.this.collapsedOffset)) {top GaoDeBottomSheetBehavior.this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;} else {top GaoDeBottomSheetBehavior.this.collapsedOffset;targetState STATE_COLLAPSED;}}} else {top GaoDeBottomSheetBehavior.this.parentHeight;targetState STATE_HIDDEN;}if (GaoDeBottomSheetBehavior.this.viewDragHelper.settleCapturedViewAt(releasedChild.getLeft(), top)) {GaoDeBottomSheetBehavior.this.setStateInternal(STATE_SETTLING);ViewCompat.postOnAnimation(releasedChild, GaoDeBottomSheetBehavior.this.new SettleRunnable(releasedChild, targetState));} else {GaoDeBottomSheetBehavior.this.setStateInternal(targetState);}}Overridepublic int clampViewPositionVertical(NonNull View child, int top, int dy) {return MathUtils.clamp(top, GaoDeBottomSheetBehavior.this.getExpandedOffset(), GaoDeBottomSheetBehavior.this.hideable ? GaoDeBottomSheetBehavior.this.parentHeight : GaoDeBottomSheetBehavior.this.collapsedOffset);}Overridepublic int clampViewPositionHorizontal(NonNull View child, int left, int dx) {return child.getLeft();}Overridepublic int getViewVerticalDragRange(NonNull View child) {return GaoDeBottomSheetBehavior.this.hideable ? GaoDeBottomSheetBehavior.this.parentHeight : GaoDeBottomSheetBehavior.this.collapsedOffset;}}Overridepublic Parcelable onSaveInstanceState(CoordinatorLayout parent, V child) {return new GaoDeBottomSheetBehavior.SavedState(super.onSaveInstanceState(parent, child), this.state);}Overridepublic void onRestoreInstanceState(CoordinatorLayout parent, V child, Parcelable state) {GaoDeBottomSheetBehavior.SavedState ss (GaoDeBottomSheetBehavior.SavedState) state;super.onRestoreInstanceState(parent, child, ss.getSuperState());if (ss.state ! STATE_DRAGGING ss.state ! STATE_SETTLING) {this.state ss.state;} else {this.state STATE_COLLAPSED;}}Overridepublic boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) {if (ViewCompat.getFitsSystemWindows(parent) !ViewCompat.getFitsSystemWindows(child)) {child.setFitsSystemWindows(true);}int savedTop child.getTop();parent.onLayoutChild(child, layoutDirection);this.parentHeight parent.getHeight();if (this.peekHeightAuto) {if (this.peekHeightMin 0) {this.peekHeightMin parent.getResources().getDimensionPixelSize(R.dimen.design_bottom_sheet_peek_height_min);}this.lastPeekHeight Math.max(this.peekHeightMin, this.parentHeight - parent.getWidth() * 9 / 16);} else {this.lastPeekHeight this.peekHeight;}if (mMiddleHeightAuto) {mMiddleHeight this.parentHeight;}this.fitToContentsOffset Math.max(0, this.parentHeight - child.getHeight());this.halfExpandedOffset this.parentHeight - mMiddleHeight;this.calculateCollapsedOffset();if (this.state STATE_EXPANDED) {ViewCompat.offsetTopAndBottom(child, this.getExpandedOffset());} else if (this.state STATE_HALF_EXPANDED) {ViewCompat.offsetTopAndBottom(child, this.halfExpandedOffset);} else if (this.hideable this.state STATE_HIDDEN) {ViewCompat.offsetTopAndBottom(child, this.parentHeight);} else if (this.state STATE_COLLAPSED) {ViewCompat.offsetTopAndBottom(child, this.collapsedOffset);} else if (this.state STATE_DRAGGING || this.state STATE_SETTLING) {ViewCompat.offsetTopAndBottom(child, savedTop - child.getTop());}if (this.viewDragHelper null) {this.viewDragHelper ViewDragHelper.create(parent, this.dragCallback);}this.viewRef new WeakReference(child);this.nestedScrollingChildRef new WeakReference(this.findScrollingChild(child));return true;}Overridepublic boolean onInterceptTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {if (!child.isShown()) {this.ignoreEvents true;return false;} else {int action event.getActionMasked();if (action 0) {this.reset();}if (this.velocityTracker null) {this.velocityTracker VelocityTracker.obtain();}this.velocityTracker.addMovement(event);switch (action) {case 0:int initialX (int) event.getX();this.initialY (int) event.getY();View scroll this.nestedScrollingChildRef ! null ? (View) this.nestedScrollingChildRef.get() : null;if (scroll ! null parent.isPointInChildBounds(scroll, initialX, this.initialY)) {this.activePointerId event.getPointerId(event.getActionIndex());this.touchingScrollingChild true;}this.ignoreEvents this.activePointerId -1 !parent.isPointInChildBounds(child, initialX, this.initialY);break;case 1:case 3:this.touchingScrollingChild false;this.activePointerId -1;if (this.ignoreEvents) {this.ignoreEvents false;return false;}case 2:}if (!this.ignoreEvents this.viewDragHelper ! null this.viewDragHelper.shouldInterceptTouchEvent(event)) {return true;} else {View scroll this.nestedScrollingChildRef ! null ? (View) this.nestedScrollingChildRef.get() : null;return action 2 scroll ! null !this.ignoreEvents this.state ! 1 !parent.isPointInChildBounds(scroll, (int) event.getX(), (int) event.getY()) this.viewDragHelper ! null Math.abs((float) this.initialY - event.getY()) (float) this.viewDragHelper.getTouchSlop();}}}Overridepublic boolean onTouchEvent(CoordinatorLayout parent, V child, MotionEvent event) {if (!child.isShown()) {return false;} else {int action event.getActionMasked();if (this.state STATE_DRAGGING action 0) {return true;} else {if (this.viewDragHelper ! null) {this.viewDragHelper.processTouchEvent(event);}if (action 0) {this.reset();}if (this.velocityTracker null) {this.velocityTracker VelocityTracker.obtain();}this.velocityTracker.addMovement(event);if (action 2 !this.ignoreEvents Math.abs((float) this.initialY - event.getY()) (float) this.viewDragHelper.getTouchSlop()) {this.viewDragHelper.captureChildView(child, event.getPointerId(event.getActionIndex()));}return !this.ignoreEvents;}}}Overridepublic boolean onStartNestedScroll(NonNull CoordinatorLayout coordinatorLayout, NonNull V child, NonNull View directTargetChild, NonNull View target, int axes, int type) {this.lastNestedScrollDy 0;this.nestedScrolled false;return (axes 2) ! 0;}Overridepublic void onNestedPreScroll(NonNull CoordinatorLayout coordinatorLayout, NonNull V child, NonNull View target, int dx, int dy, NonNull int[] consumed, int type) {if (type ! 1) {View scrollingChild (View) this.nestedScrollingChildRef.get();if (target scrollingChild) {int currentTop child.getTop();int newTop currentTop - dy;if (dy 0) {if (newTop this.getExpandedOffset()) {consumed[1] currentTop - this.getExpandedOffset();ViewCompat.offsetTopAndBottom(child, -consumed[1]);this.setStateInternal(STATE_EXPANDED);} else {consumed[1] dy;ViewCompat.offsetTopAndBottom(child, -dy);this.setStateInternal(STATE_DRAGGING);}} else if (dy 0 !target.canScrollVertically(-1)) {if (newTop this.collapsedOffset !this.hideable) {consumed[1] currentTop - this.collapsedOffset;ViewCompat.offsetTopAndBottom(child, -consumed[1]);this.setStateInternal(STATE_COLLAPSED);} else {consumed[1] dy;ViewCompat.offsetTopAndBottom(child, -dy);this.setStateInternal(STATE_DRAGGING);}}this.dispatchOnSlide(child.getTop());this.lastNestedScrollDy dy;this.nestedScrolled true;}}}Overridepublic void onStopNestedScroll(NonNull CoordinatorLayout coordinatorLayout, NonNull V child, NonNull View target, int type) {if (child.getTop() this.getExpandedOffset()) {this.setStateInternal(STATE_EXPANDED);} else if (target this.nestedScrollingChildRef.get() this.nestedScrolled) {int top;byte targetState;if (this.lastNestedScrollDy 0) {int currentTop child.getTop();if (currentTop collapsedOffset - HIDE_THRESHOLD currentTop halfExpandedOffset) {top this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;} else {top this.getExpandedOffset();targetState STATE_EXPANDED;}} else if (this.hideable this.shouldHide(child, this.getYVelocity())) {top this.parentHeight;targetState STATE_HIDDEN;} else if (this.lastNestedScrollDy 0) {int currentTop child.getTop();if (this.fitToContents) {if (Math.abs(currentTop - this.fitToContentsOffset) Math.abs(currentTop - this.collapsedOffset)) {top this.fitToContentsOffset;targetState STATE_EXPANDED;} else {top this.collapsedOffset;targetState STATE_COLLAPSED;}} else if (currentTop this.halfExpandedOffset) {if (currentTop Math.abs(currentTop - this.collapsedOffset)) {top 0;targetState STATE_EXPANDED;} else {top this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;}} else if (Math.abs(currentTop - this.halfExpandedOffset) Math.abs(currentTop - this.collapsedOffset)) {top this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;} else {top this.collapsedOffset;targetState STATE_COLLAPSED;}} else {int currentTop child.getTop();if (currentTop halfExpandedOffset HIDE_THRESHOLD currentTop HIDE_THRESHOLD) {top this.halfExpandedOffset;targetState STATE_HALF_EXPANDED;} else {top this.collapsedOffset;targetState STATE_COLLAPSED;}}if (this.viewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) {this.setStateInternal(STATE_SETTLING);ViewCompat.postOnAnimation(child, new GaoDeBottomSheetBehavior.SettleRunnable(child, targetState));} else {this.setStateInternal(targetState);}this.nestedScrolled false;}}Overridepublic boolean onNestedPreFling(NonNull CoordinatorLayout coordinatorLayout, NonNull V child, NonNull View target, float velocityX, float velocityY) {return target this.nestedScrollingChildRef.get() (this.state ! STATE_EXPANDED || super.onNestedPreFling(coordinatorLayout, child, target, velocityX, velocityY));}public boolean isFitToContents() {return this.fitToContents;}public void setFitToContents(boolean fitToContents) {if (this.fitToContents ! fitToContents) {this.fitToContents fitToContents;if (this.viewRef ! null) {this.calculateCollapsedOffset();}this.setStateInternal(this.fitToContents this.state STATE_HALF_EXPANDED ? STATE_HALF_EXPANDED : this.state);}}public final void setPeekHeight(int peekHeight) {boolean layout false;if (peekHeight -1) {if (!this.peekHeightAuto) {this.peekHeightAuto true;layout true;}} else if (this.peekHeightAuto || this.peekHeight ! peekHeight) {this.peekHeightAuto false;this.peekHeight Math.max(0, peekHeight);this.collapsedOffset this.parentHeight - peekHeight;layout true;}if (layout this.state STATE_COLLAPSED this.viewRef ! null) {V view (V) this.viewRef.get();if (view ! null) {view.requestLayout();}}}public final void setMiddleHeight(int middleHeight) {boolean layout false;if (middleHeight PEEK_HEIGHT_AUTO) {if (!mMiddleHeightAuto) {mMiddleHeightAuto true;layout true;}} else if (mMiddleHeightAuto || mMiddleHeight ! middleHeight) {mMiddleHeightAuto false;mMiddleHeight Math.max(0, middleHeight);layout true;}if (layout this.state STATE_COLLAPSED viewRef ! null) {V view viewRef.get();if (view ! null) {view.requestLayout();}}}public final int getPeekHeight() {return this.peekHeightAuto ? -1 : this.peekHeight;}public final int getMiddleHeight() {return this.mMiddleHeightAuto ? -1 : this.mMiddleHeight;}public final int getParentHeight() {return this.parentHeight;}public void setHideable(boolean hideable) {this.hideable hideable;}public boolean isHideable() {return this.hideable;}public void setSkipCollapsed(boolean skipCollapsed) {this.skipCollapsed skipCollapsed;}public boolean getSkipCollapsed() {return this.skipCollapsed;}public void setBottomSheetCallback(GaoDeBottomSheetBehavior.BottomSheetCallback callback) {this.callback callback;}public final void setState(final int state) {if (state ! this.state) {if (this.viewRef null) {if (state STATE_COLLAPSED || state STATE_EXPANDED || state STATE_HALF_EXPANDED || this.hideable state STATE_HIDDEN) {this.state state;}} else {final V child (V) this.viewRef.get();if (child ! null) {ViewParent parent child.getParent();if (parent ! null parent.isLayoutRequested() ViewCompat.isAttachedToWindow(child)) {child.post(new Runnable() {Overridepublic void run() {GaoDeBottomSheetBehavior.this.startSettlingAnimation(child, state);}});} else {this.startSettlingAnimation(child, state);}}}}}public final int getState() {return this.state;}void setStateInternal(int state) {if (this.state ! state) {this.state state;if (state ! STATE_HALF_EXPANDED state ! STATE_EXPANDED) {if (state STATE_HIDDEN || state STATE_COLLAPSED) {this.updateImportantForAccessibility(false);}} else {this.updateImportantForAccessibility(true);}View bottomSheet (View) this.viewRef.get();if (bottomSheet ! null this.callback ! null) {this.callback.onStateChanged(bottomSheet, state);}}}private void calculateCollapsedOffset() {if (this.fitToContents) {this.collapsedOffset Math.max(this.parentHeight - this.lastPeekHeight, this.fitToContentsOffset);} else {this.collapsedOffset this.parentHeight - this.lastPeekHeight;}}private void reset() {this.activePointerId -1;if (this.velocityTracker ! null) {this.velocityTracker.recycle();this.velocityTracker null;}}boolean shouldHide(View child, float yvel) {if (this.skipCollapsed) {return true;} else if (child.getTop() this.collapsedOffset) {return false;} else {float newTop (float) child.getTop() yvel * HIDE_FRICTION;return Math.abs(newTop - (float) this.collapsedOffset) / (float) this.peekHeight HIDE_THRESHOLD;}}VisibleForTestingView findScrollingChild(View view) {if (ViewCompat.isNestedScrollingEnabled(view)) {return view;} else {if (view instanceof ViewGroup) {ViewGroup group (ViewGroup) view;int i 0;for (int count group.getChildCount(); i count; i) {View scrollingChild this.findScrollingChild(group.getChildAt(i));if (scrollingChild ! null) {return scrollingChild;}}}return null;}}private float getYVelocity() {if (this.velocityTracker null) {return 0.0F;} else {this.velocityTracker.computeCurrentVelocity(1000, this.maximumVelocity);return this.velocityTracker.getYVelocity(this.activePointerId);}}private int getExpandedOffset() {return this.fitToContents ? this.fitToContentsOffset : 0;}void startSettlingAnimation(View child, int state) {int top;if (state STATE_COLLAPSED) {top this.collapsedOffset;} else if (state STATE_HALF_EXPANDED) {top this.halfExpandedOffset;} else if (state STATE_EXPANDED) {top this.getExpandedOffset();} else {if (!this.hideable || state ! STATE_HIDDEN) {throw new IllegalArgumentException(Illegal state argument: state);}top this.parentHeight;}if (this.viewDragHelper.smoothSlideViewTo(child, child.getLeft(), top)) {this.setStateInternal(STATE_SETTLING);ViewCompat.postOnAnimation(child, new GaoDeBottomSheetBehavior.SettleRunnable(child, state));} else {this.setStateInternal(state);}}void dispatchOnSlide(int top) {View bottomSheet (View) this.viewRef.get();if (bottomSheet ! null this.callback ! null) {if (top this.collapsedOffset) {this.callback.onSlide(bottomSheet, (float) (this.collapsedOffset - top) / (float) (this.parentHeight - this.collapsedOffset));} else {this.callback.onSlide(bottomSheet, (float) (this.collapsedOffset - top) / (float) (this.collapsedOffset - this.getExpandedOffset()));}}}VisibleForTestingint getPeekHeightMin() {return this.peekHeightMin;}public static V extends View GaoDeBottomSheetBehaviorV from(V view) {LayoutParams params view.getLayoutParams();if (!(params instanceof CoordinatorLayout.LayoutParams)) {throw new IllegalArgumentException(The view is not a child of CoordinatorLayout);} else {Behavior behavior ((CoordinatorLayout.LayoutParams) params).getBehavior();if (!(behavior instanceof GaoDeBottomSheetBehavior)) {throw new IllegalArgumentException(The view is not associated with BottomSheetBehavior);} else {return (GaoDeBottomSheetBehavior) behavior;}}}SuppressLint(WrongConstant)private void updateImportantForAccessibility(boolean expanded) {if (this.viewRef ! null) {ViewParent viewParent ((View) this.viewRef.get()).getParent();if (viewParent instanceof CoordinatorLayout) {CoordinatorLayout parent (CoordinatorLayout) viewParent;int childCount parent.getChildCount();if (VERSION.SDK_INT 16 expanded) {if (this.importantForAccessibilityMap ! null) {return;}this.importantForAccessibilityMap new HashMap(childCount);}for (int i 0; i childCount; i) {View child parent.getChildAt(i);if (child ! this.viewRef.get()) {if (!expanded) {if (this.importantForAccessibilityMap ! null this.importantForAccessibilityMap.containsKey(child)) {ViewCompat.setImportantForAccessibility(child, (Integer) this.importantForAccessibilityMap.get(child));}} else {if (VERSION.SDK_INT 16) {this.importantForAccessibilityMap.put(child, child.getImportantForAccessibility());}ViewCompat.setImportantForAccessibility(child, 4);}}}if (!expanded) {this.importantForAccessibilityMap null;}}}}protected static class SavedState extends AbsSavedState {final int state;public static final CreatorGaoDeBottomSheetBehavior.SavedState CREATOR new ClassLoaderCreatorGaoDeBottomSheetBehavior.SavedState() {Overridepublic GaoDeBottomSheetBehavior.SavedState createFromParcel(Parcel in, ClassLoader loader) {return new GaoDeBottomSheetBehavior.SavedState(in, loader);}Overridepublic GaoDeBottomSheetBehavior.SavedState createFromParcel(Parcel in) {return new GaoDeBottomSheetBehavior.SavedState(in, (ClassLoader) null);}Overridepublic GaoDeBottomSheetBehavior.SavedState[] newArray(int size) {return new GaoDeBottomSheetBehavior.SavedState[size];}};public SavedState(Parcel source) {this(source, (ClassLoader) null);}public SavedState(Parcel source, ClassLoader loader) {super(source, loader);this.state source.readInt();}public SavedState(Parcelable superState, int state) {super(superState);this.state state;}Overridepublic void writeToParcel(Parcel out, int flags) {super.writeToParcel(out, flags);out.writeInt(this.state);}}private class SettleRunnable implements Runnable {private final View view;private final int targetState;SettleRunnable(View view, int targetState) {this.view view;this.targetState targetState;}Overridepublic void run() {if (GaoDeBottomSheetBehavior.this.viewDragHelper ! null GaoDeBottomSheetBehavior.this.viewDragHelper.continueSettling(true)) {ViewCompat.postOnAnimation(this.view, this);} else {GaoDeBottomSheetBehavior.this.setStateInternal(this.targetState);}}}Retention(RetentionPolicy.SOURCE)RestrictTo({Scope.LIBRARY_GROUP})public interface State {}public abstract static class BottomSheetCallback {public BottomSheetCallback() {}public abstract void onStateChanged(NonNull View var1, int var2);public abstract void onSlide(NonNull View var1, float var2);}
}
使用的时候直接设置 androidx.appcompat.widget.LinearLayoutCompatandroid:idid/bottom_sheetandroid:layout_widthmatch_parentandroid:layout_heightmatch_parentandroid:backgroundandroid:color/whiteandroid:orientationverticalandroid:visibilityvisibleapp:behavior_hideablefalseapp:behavior_middleHeight200dpapp:behavior_peekHeight80dpapp:layout_behavior.gaode.GaoDeBottomSheetBehaviortools:ignoreMissingPrefix//..../androidx.appcompat.widget.LinearLayoutCompat对于按钮滑动及通明度渐变隐藏显示也是通过实现behavior因为比较的简单直接上代码
package com.zwl.mybehaviordemo.gaode;import android.content.Context;
import android.util.AttributeSet;
import android.view.View;import androidx.annotation.NonNull;
import androidx.appcompat.widget.LinearLayoutCompat;
import androidx.coordinatorlayout.widget.CoordinatorLayout;
import androidx.core.view.ViewCompat;import com.zwl.mybehaviordemo.R;/*** 高德首页按钮处理** author yixiaolunhui*/
public class GaoDeBtnBehavior extends CoordinatorLayout.Behavior {private View rightActions;private View topActions;public GaoDeBtnBehavior() {}public GaoDeBtnBehavior(Context context, AttributeSet attrs) {super(context, attrs);}Overridepublic boolean onLayoutChild(NonNull CoordinatorLayout parent, NonNull View child, int layoutDirection) {if (ViewCompat.getFitsSystemWindows(parent) !ViewCompat.getFitsSystemWindows(child)) {child.setFitsSystemWindows(true);}if (rightActions null) {rightActions parent.findViewById(R.id.rightActions);}if (topActions null) {topActions parent.findViewById(R.id.topActions);}return super.onLayoutChild(parent, child, layoutDirection);}Overridepublic boolean layoutDependsOn(NonNull CoordinatorLayout parent, NonNull View child, NonNull View dependency) {return dependency instanceof LinearLayoutCompat || super.layoutDependsOn(parent, child, dependency);}Overridepublic boolean onDependentViewChanged(NonNull CoordinatorLayout parent, NonNull View child, NonNull View dependency) {//判断当前dependency 是内容布局if (dependency instanceof LinearLayoutCompat dependency.getId() R.id.bottom_sheet) {if (rightActions ! null) {GaoDeBottomSheetBehavior behavior GaoDeBottomSheetBehavior.from(dependency);int middleHeight behavior.getParentHeight() - behavior.getMiddleHeight() - rightActions.getMeasuredHeight();CoordinatorLayout.LayoutParams layoutParams (CoordinatorLayout.LayoutParams) rightActions.getLayoutParams();int newY dependency.getTop() - rightActions.getHeight() - layoutParams.bottomMargin;if (newY middleHeight) {rightActions.setTranslationY(newY - layoutParams.bottomMargin);} else {rightActions.setTranslationY(middleHeight);}int offset behavior.getParentHeight() - behavior.getMiddleHeight() - layoutParams.bottomMargin - dependency.getTop();float alpha 1f - offset * 1.0f / rightActions.getHeight();rightActions.setAlpha(alpha);if (topActions ! null) {topActions.setAlpha(alpha);}}}return super.onDependentViewChanged(parent, child, dependency);}}
githubgithub.com/yixiaolunhui/FGaoDeIndexDemo 好了话不多说一笑轮回~~~~~
