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  3. android.support.v4.widget.ViewDragHelper

Java 类android.support.v4.widget.ViewDragHelper 实例源码

项目：RLibrary    文件：SwipeBackLayout.java    
@Override
public boolean tryCaptureView(View child, int pointerId) {
    isCaptureAbort = false;
    if (!enableSwipeBack) {
        return false;
    }
    if (child == null || child.getLeft() != 0 || child.getTranslationX() != 0f ||
            mViewDragState != ViewDragHelper.STATE_IDLE) {
        return false;
    }
    mIsLeftEdge = mDragHelper.isEdgeTouched(ViewDragHelper.EDGE_LEFT, pointerId);
    mTargetView = child;
    if (mIsLeftEdge || isForceIntercept()) {
        return canTryCaptureView(child);
    }
    return false;
}
项目：GitHub    文件：SwipeBackLayout.java    
@Override
public boolean tryCaptureView(View child, int pointerId) {
    boolean edgeTouched = mDragHelper.isEdgeTouched(mEdgeFlag, pointerId);
    if (edgeTouched) {
        if (mDragHelper.isEdgeTouched(EDGE_LEFT, pointerId)) {
            mTrackingEdge = EDGE_LEFT;
        } else if (mDragHelper.isEdgeTouched(EDGE_RIGHT, pointerId)) {
            mTrackingEdge = EDGE_RIGHT;
        } else if (mDragHelper.isEdgeTouched(EDGE_BOTTOM, pointerId)) {
            mTrackingEdge = EDGE_BOTTOM;
        }
    }
    boolean directionCheck = false;
    if (mEdgeFlag == EDGE_LEFT || mEdgeFlag == EDGE_RIGHT) {
        // 左右边缘则检测竖直方向的滑动
        directionCheck = !mDragHelper.checkTouchSlop(ViewDragHelper.DIRECTION_VERTICAL, pointerId);
    } else if (mEdgeFlag == EDGE_BOTTOM) {
        // 下边缘则检测水平方向的滑动
        directionCheck = !mDragHelper.checkTouchSlop(ViewDragHelper.DIRECTION_HORIZONTAL, pointerId);
    } else if (mEdgeFlag == EDGE_ALL) {
        directionCheck = true;
    }
    return edgeTouched && directionCheck;
}
项目：GitHub    文件：DragLayout.java    
public DragLayout(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);

    TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.app, 0, 0);
    bottomDragVisibleHeight = (int) a.getDimension(R.styleable.app_bottomDragVisibleHeight, 0);
    bototmExtraIndicatorHeight = (int) a.getDimension(R.styleable.app_bototmExtraIndicatorHeight, 0);
    a.recycle();

    mDragHelper = ViewDragHelper
            .create(this, 10f, new DragHelperCallback());
    mDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_TOP);
    moveDetector = new GestureDetectorCompat(context, new MoveDetector());
    moveDetector.setIsLongpressEnabled(false); // 不处理长按事件

    // 滑动的距离阈值由系统提供
    ViewConfiguration configuration = ViewConfiguration.get(getContext());
    mTouchSlop = configuration.getScaledTouchSlop();
}
项目：WechatChatroomHelper    文件：BGASwipeBackLayout2.java    
@Override
        public void onViewDragStateChanged(int state) {
            if (mDragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE) {
                if (mSlideOffset == 0) {
                    updateObscuredViewsVisibility(mSlideableView);
                    dispatchOnPanelClosed(mSlideableView);
                    mPreservedOpenState = false;
                } else {
                    dispatchOnPanelOpened(mSlideableView);
                    mPreservedOpenState = true;
                }
                // ======================== 新加的 START ========================
//            }
                mIsSliding = false;
            } else {
                mIsSliding = true;
            }
            // ======================== 新加的 END ========================
        }
项目：WechatChatroomHelper    文件：BGASwipeBackLayout2.java    
public BGASwipeBackLayout2(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        final float density = context.getResources().getDisplayMetrics().density;

        // ======================== 新加的 START ========================
//        mOverhangSize = (int) (DEFAULT_OVERHANG_SIZE * density + 0.5f);
        mOverhangSize = 0;
        // ======================== 新加的 END ========================

        final ViewConfiguration viewConfig = ViewConfiguration.get(context);

        setWillNotDraw(false);

        ViewCompat.setAccessibilityDelegate(this, new AccessibilityDelegate());
        ViewCompat.setImportantForAccessibility(this, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);

        mDragHelper = ViewDragHelper.create(this, 0.5f, new DragHelperCallback());
        mDragHelper.setMinVelocity(MIN_FLING_VELOCITY * density);
    }
项目：android-SpringAnimator    文件：TranslationPreviewFragment.java    
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    ViewGroup view = (ViewGroup) inflater.inflate(R.layout.fragment_square, container, false);
    mCardView = (CardView) view.findViewById(R.id.card_view);

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        mCardZ = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 2.f, getResources().getDisplayMetrics());
        mCardView.setZ(mCardZ);
    }

    final ViewDragHelper viewDragHelper = ViewDragHelper.create(view, mViewDragHelperCallback);
    view.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            viewDragHelper.processTouchEvent(event);
            return false;
        }
    });

    recordOriginalLocation(mCardView);

    return view;
}
项目：Pocket-Plays-for-Twitch    文件：Service.java    
/**
 * Method for increasing a Navigation Drawer's edge size.
 */
public static void increaseNavigationDrawerEdge(DrawerLayout aDrawerLayout, Context context) {
    // Increase the area from which you can open the navigation drawer.
    try {
        Field mDragger = aDrawerLayout.getClass().getDeclaredField("mLeftDragger");
        mDragger.setAccessible(true);
        ViewDragHelper draggerObj = (ViewDragHelper) mDragger.get(aDrawerLayout);

        Field mEdgeSize = draggerObj.getClass().getDeclaredField("mEdgeSize");
        mEdgeSize.setAccessible(true);
        int edgeSize = mEdgeSize.getInt(draggerObj) * 3;

        mEdgeSize.setInt(draggerObj, edgeSize); //optimal value as for me, you may set any constant in dp
    } catch(Exception e) {
        e.printStackTrace();
    }
}
项目：drag-to-close    文件：DragHelperCallback.java    
/**
 * Checks dragging states and notifies them.
 */
@Override
public void onViewDragStateChanged(int state) {
    // If no state change, don't do anything
    if (state == lastDraggingState) {
        return;
    }
    // If last state was dragging or settling and current state is idle,
    // the view has stopped moving. If the top border of the container is
    // equal to the vertical draggable range, the view has being dragged out,
    // so close activity is called
    if ((lastDraggingState == ViewDragHelper.STATE_DRAGGING
            || lastDraggingState == ViewDragHelper.STATE_SETTLING)
            && state == ViewDragHelper.STATE_IDLE
            && topBorderDraggableContainer == dragToClose.getDraggableRange()) {
        dragToClose.closeActivity();

    }
    // If the view has just started being dragged, notify event
    if (state == ViewDragHelper.STATE_DRAGGING) {
        dragToClose.onStartDraggingView();
    }
    // Save current state
    lastDraggingState = state;
}
项目：Widgets    文件：SlideLayout.java    
private void init(Context context, AttributeSet attrs) {
    //获取相关属性设置
    TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.SlideLayout);
    mAlphaColor = ta.getColor(R.styleable.SlideLayout_sl_anim_alpha_color, DEF_ANIM_ALPHA_COLOR);
    mEdgeEnable = ta.getBoolean(R.styleable.SlideLayout_sl_edge_enable, DEF_EDGE_ENABLE);
    mMainAlphaEnable = ta.getBoolean(R.styleable.SlideLayout_sl_main_alpha_enable, DEF_MAIN_ALPHA_ENABLE);
    ta.recycle();

    //初始化ViewDragHelper相关
    mCallback = new DragCallback();
    mDragHelper = ViewDragHelper.create(this, DEF_SENSITIVITY, mCallback);

    if (mEdgeEnable) {
        //设置边缘滑动检测
        mDragHelper.setEdgeTrackingEnabled(ViewDragHelper.EDGE_LEFT);
        //设置最小滑动速度
        mDragHelper.setMinVelocity(DEF_SENSITIVITY * DEF_MIN_FLING_VELOCITY);
    }

    //初始化屏幕触控处理相关
    mGestureListener = new GestureListener();
    mGestureDetector = new GestureDetectorCompat(context, mGestureListener);

    //设置初始状态为关闭
    mStatus = Status.CLOSED;
}
项目：Multi-SwipeBackLayout    文件：SwipeBackLayout.java    
/**
 * \
 * 通过xml布局 自定义属性调用
 *
 * @param context 上下文
 * @param attrs   xml属性
 */
public SwipeBackLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    //①获取ViewDragHelper的实例
    mViewDragHelper = ViewDragHelper.create(this, 1.0f, new ViewDragHelperCallback());
    TypedArray ta = context.obtainStyledAttributes(attrs, R.styleable.SwipeBackLayout);
    mDragDirectionMask = ta.getInt(R.styleable.SwipeBackLayout_dragDirection, NONE);
    mShadowColor = ta.getColor(R.styleable.SwipeBackLayout_shadowColor, mShadowColor);
    int contentLayoutId = ta.getResourceId(R.styleable.SwipeBackLayout_contentView,View.NO_ID);
    ta.recycle();

    addShadowView(context);
    if (View.NO_ID != contentLayoutId){
        mContentView = LayoutInflater.from(context).inflate(contentLayoutId, this, false);
        addView(mContentView);
    }
    enableSwipeBack = true;
}
项目：pulltorefresh    文件：FPullToRefreshView.java    
private int getTopLayoutHeaderView()
{
    // 初始值
    int top = getTopHeaderViewReset();

    if (getDirection() == Direction.FROM_HEADER)
    {
        if (mViewDragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE)
        {
            switch (mState)
            {
                case REFRESHING:
                case REFRESH_SUCCESS:
                case REFRESH_FAILURE:
                    top += mHeaderView.getRefreshHeight();
                    break;
            }
        } else
        {
            top = mHeaderView.getTop();
        }
    }
    return top;
}
项目：pulltorefresh    文件：FPullToRefreshView.java    
private int getTopLayoutFooterView()
{
    // 初始值
    int top = getTopFooterViewReset();

    if (getDirection() == Direction.FROM_FOOTER)
    {
        if (mViewDragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE)
        {
            switch (mState)
            {
                case REFRESHING:
                case REFRESH_SUCCESS:
                case REFRESH_FAILURE:
                    top -= mFooterView.getRefreshHeight();
                    break;
            }
        } else
        {
            top = mFooterView.getTop();
        }
    }
    return top;
}
项目：Tribe    文件：DraggableSquareView.java    
public DraggableSquareView(Context context, AttributeSet attrs, int defStyleAttr) {
    super(context, attrs, defStyleAttr);
    mDragHelper = ViewDragHelper
            .create(this, 10f, new DragHelperCallback());
    moveDetector = new GestureDetectorCompat(context,
            new MoveDetector());
    moveDetector.setIsLongpressEnabled(false); // 不能处理长按事件，否则违背最初设计的初衷
    spaceInterval = (int) getResources().getDimension(R.dimen.drag_square_interval); // 小方块之间的间隔

    // 滑动的距离阈值由系统提供
    ViewConfiguration configuration = ViewConfiguration.get(getContext());
    mTouchSlop = configuration.getScaledTouchSlop();

    anchorHandler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            if (draggingView != null) {
                // 开始移动重心的动画
                draggingView.startAnchorAnimation();
            }
        }
    };
}
项目：GCSApp    文件：ShoppingCartAdapter.java    
private void setDrawerLeftEdgeSize (Context context, DrawerLayout drawerLayout, float displayWidthPercentage) {
    if (context == null || drawerLayout == null) return;
    try {
        // 找到 ViewDragHelper 并设置 Accessible 为true
        Field leftDraggerField =
                drawerLayout.getClass().getDeclaredField("mRightDragger");//Right
        leftDraggerField.setAccessible(true);
        ViewDragHelper leftDragger = (ViewDragHelper) leftDraggerField.get(drawerLayout);

        // 找到 edgeSizeField 并设置 Accessible 为true
        Field edgeSizeField = leftDragger.getClass().getDeclaredField("mEdgeSize");
        edgeSizeField.setAccessible(true);
        int edgeSize = edgeSizeField.getInt(leftDragger);

        // 设置新的边缘大小
        int screenWidth = PixelUtil.getWidth(context);
        edgeSizeField.setInt(leftDragger, Math.max(edgeSize, (int) (screenWidth * displayWidthPercentage)));
    } catch (Exception e) {
        Log.e("aaa", "setDrawerLeftEdgeSize wrong");
    }
}
项目：boohee_v5.6    文件：BottomSheetBehavior.java    
public boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) {
    if (!(this.mState == 1 || this.mState == 2)) {
        parent.onLayoutChild(child, layoutDirection);
    }
    this.mParentHeight = parent.getHeight();
    this.mMinOffset = Math.max(0, this.mParentHeight - child.getHeight());
    this.mMaxOffset = Math.max(this.mParentHeight - this.mPeekHeight, this.mMinOffset);
    if (this.mState == 3) {
        ViewCompat.offsetTopAndBottom(child, this.mMinOffset);
    } else if (this.mHideable && this.mState == 5) {
        ViewCompat.offsetTopAndBottom(child, this.mParentHeight);
    } else if (this.mState == 4) {
        ViewCompat.offsetTopAndBottom(child, this.mMaxOffset);
    }
    if (this.mViewDragHelper == null) {
        this.mViewDragHelper = ViewDragHelper.create(parent, this.mDragCallback);
    }
    this.mViewRef = new WeakReference(child);
    this.mNestedScrollingChildRef = new WeakReference(findScrollingChild(child));
    return true;
}
项目：Glitchy    文件：SideMenu.java    
public SideMenu(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);

    final float density = context.getResources().getDisplayMetrics().density;
    mOverhangSize = (int) (DEFAULT_OVERHANG_SIZE * density + 0.5f);

    final ViewConfiguration viewConfig = ViewConfiguration.get(context);

    setWillNotDraw(false);

    ViewCompat.setAccessibilityDelegate(this, new AccessibilityDelegate());
    ViewCompat.setImportantForAccessibility(this, ViewCompat.IMPORTANT_FOR_ACCESSIBILITY_YES);

    mDragHelper = ViewDragHelper.create(this, 0.5f, new DragHelperCallback());
    mDragHelper.setMinVelocity(MIN_FLING_VELOCITY * density);

    setPanelSlideListener(new SimpleMenuPanelSlideListener());
    setSliderFadeColor(ContextCompat.getColor(context, android.R.color.transparent));
    setParallaxDistance(PARALLAX_DISTANCE);
}
项目：AppFirCloud    文件：ResideLayout.java    
@Override
public void onViewDragStateChanged(int state) {
    if (mDragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE) {
        if (mSlideOffset == 0) {
            updateObscuredViewsVisibility(mSlideableView);
            dispatchOnPanelClosed(mSlideableView);
            mPreservedOpenState = false;
        } else {
            dispatchOnPanelOpened(mSlideableView);
            mPreservedOpenState = true;
        }
    }
}
项目：rebase-android    文件：SwipeBackLayout.java    
@Override
public void onViewDragStateChanged(int state) {
    if (state == draggingState) return;

    if ((draggingState == ViewDragHelper.STATE_DRAGGING ||
        draggingState == ViewDragHelper.STATE_SETTLING) &&
        state == ViewDragHelper.STATE_IDLE) {
        // the view stopped from moving.
        if (draggingOffset == getDragRange()) {
            finish();
        }
    }

    draggingState = state;
}
项目：GitHub    文件：SwipeBackLayout.java    
@Override
public void onViewReleased(View releasedChild, float xvel, float yvel) {
    super.onViewReleased(releasedChild, xvel, yvel);
    if (mCurEdgeFlag == ViewDragHelper.EDGE_LEFT) {

        if (mCurrentX > getWidth() / 2) {
            mViewDragHelper.settleCapturedViewAt(getWidth(), 0);
        } else {
            mViewDragHelper.settleCapturedViewAt(0, 0);
            mCurrentX = 0;
        }
        invalidate();
    }

}
项目：GitHub    文件：SwipeBackLayout.java    
@Override
public void onViewPositionChanged(View changedView, int left, int top, int dx, int dy) {
    super.onViewPositionChanged(changedView, left, top, dx, dy);
    if (mCurEdgeFlag == ViewDragHelper.EDGE_LEFT) {
        if (mOnScrollListener != null)
            mOnScrollListener.complete((float) (Math.abs(left) * 1.00 / getWidth()));
        if (left >= getWidth()) finish();
    }
}
项目：QMUI_Android    文件：SwipeBackLayout.java    
@Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
    final boolean drawContent = child == mContentView;

    boolean ret = super.drawChild(canvas, child, drawingTime);
    if (mScrimOpacity > 0 && drawContent
            && mDragHelper.getViewDragState() != ViewDragHelper.STATE_IDLE) {
        drawShadow(canvas, child);
        drawScrim(canvas, child);
    }
    return ret;
}
项目：GitHub    文件：SwipeBackLayout.java    
@Override
public void onViewDragStateChanged(int state) {
    super.onViewDragStateChanged(state);
    if (state == ViewDragHelper.STATE_IDLE) {
        mTrackingEdge = EDGE_INVALID;
    }
}
项目：conductor-attacher    文件：SwipeBackLayout.java    
@Override
protected boolean drawChild(Canvas canvas, View child, long drawingTime) {
  final boolean drawContent = child == mContentView;

  final boolean ret = super.drawChild(canvas, child, drawingTime);
  if (mScrimOpacity > 0 && drawContent
      && mDragHelper.getViewDragState() != ViewDragHelper.STATE_IDLE) {
    drawScrim(canvas, child);
  }
  return ret;
}
项目：GitHub    文件：SwipeBackLayout.java    
@Override
public void onViewDragStateChanged(int state) {
    if (state == draggingState) return;

    if ((draggingState == ViewDragHelper.STATE_DRAGGING || draggingState == ViewDragHelper.STATE_SETTLING) &&
            state == ViewDragHelper.STATE_IDLE) {
        // the view stopped from moving.
        if (draggingOffset == getDragRange()) {
            finish();
        }
    }

    draggingState = state;
}
项目：Multi-SwipeToRefreshLayout    文件：SwipeToRefreshLayout.java    
public SwipeToRefreshLayout(@NonNull Context context, @NonNull View contentView, int directionMask) {
    super(context);
    mViewDragHelper = ViewDragHelper.create(this, 1.0f, new ViewDragHelperCallback());
    mContentView = contentView;
    mDirectionMask = directionMask;
    enableSwipe = true;
}
项目：Nibo    文件：BottomSheetBehaviorGoogleMapsLike.java    
@Override
public boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) {
    // First let the parent lay it out
    if (mState != STATE_DRAGGING && mState != STATE_SETTLING) {
        if (ViewCompat.getFitsSystemWindows(parent) &&
                !ViewCompat.getFitsSystemWindows(child)) {
            ViewCompat.setFitsSystemWindows(child, true);
        }
        parent.onLayoutChild(child, layoutDirection);
    }
    // Offset the bottom sheet
    mParentHeight = parent.getHeight();
    mMinOffset = Math.max(0, mParentHeight - child.getHeight());
    mMaxOffset = Math.max(mParentHeight - mPeekHeight, mMinOffset);

    /**
     * New behavior
     */
    if (mState == STATE_ANCHOR_POINT) {
        ViewCompat.offsetTopAndBottom(child, mAnchorPoint);
    } else if (mState == STATE_EXPANDED) {
        ViewCompat.offsetTopAndBottom(child, mMinOffset);
    } else if (mHideable && mState == STATE_HIDDEN) {
        ViewCompat.offsetTopAndBottom(child, mParentHeight);
    } else if (mState == STATE_COLLAPSED) {
        ViewCompat.offsetTopAndBottom(child, mMaxOffset);
    }
    if (mViewDragHelper == null) {
        mViewDragHelper = ViewDragHelper.create(parent, mDragCallback);
    }
    mViewRef = new WeakReference<>(child);
    mNestedScrollingChildRef = new WeakReference<>(findScrollingChild(child));
    return true;
}
项目：RLibrary    文件：SwipeBackLayout.java    
@Override
public void onViewDragStateChanged(int state) {
    super.onViewDragStateChanged(state);
    if (mListener != null) mListener.onStateChanged(state);
    SwipeBackLayout.this.onViewDragStateChanged(state);
    switch (state) {
        case ViewDragHelper.STATE_IDLE:
            onStateIdle();

            if (isCaptureAbort) {
                onRequestOpened();

            } else {
                //滚动结束
                if (mTargetView.getLeft() < getMinCloseWidth()) {
                    // State Open
                    onRequestOpened();
                    if (mListener != null) mListener.onRequestOpened();
                } else {
                    // State Closed
                    onRequestClose();
                    if (mListener != null) mListener.onRequestClose();
                }
                mTargetView = null;
            }
            isCaptureAbort = false;
            break;
        case ViewDragHelper.STATE_DRAGGING:
            //开始滚动
            onStateDragging();
            break;
        case ViewDragHelper.STATE_SETTLING:
            //滑行中...
            break;
    }
}
项目：Multi-SwipeToRefreshLayout    文件：SwipeDrawerLayout.java    
public SwipeDrawerLayout(@NonNull Context context, @NonNull View contentView, int directionMask) {
    super(context);
    mViewDragHelper = ViewDragHelper.create(this, 1.0f, new ViewDragHelperCallback());
    mContentView = contentView;
    mDirectionMask = directionMask;
    enableSwipe = true;
}
项目：Cable-Android    文件：QuickAttachmentDrawer.java    
public QuickAttachmentDrawer(Context context, AttributeSet attrs, int defStyle) {
  super(context, attrs, defStyle);
  dragHelper = ViewDragHelper.create(this, 1.f, new ViewDragHelperCallback());
  initializeView();
  updateHalfExpandedAnchorPoint();
  onConfigurationChanged();
}
项目：Multi-SwipeToRefreshLayout    文件：OverScrollLayout.java    
public OverScrollLayout(@NonNull Context context, @NonNull View contentView, int directionMask) {
    super(context);
    mViewDragHelper = ViewDragHelper.create(this, 1.0f, new ViewDragHelperCallback());
    mContentView = contentView;
    mDirectionMask = directionMask;
    enableSwipe = true;
}
项目：Multi-SwipeToRefreshLayout    文件：OverScrollLayout.java    
@Override
public void onViewDragStateChanged(int state) {
    super.onViewDragStateChanged(state);
    if (mLastDragState == ViewDragHelper.STATE_SETTLING && state == ViewDragHelper.STATE_DRAGGING) {
        if (mViewDragHelper.smoothSlideViewTo(mContentView, mOriginX, mOriginY)) {
            ViewCompat.postInvalidateOnAnimation(OverScrollLayout.this);
        }
    }
    if (state == ViewDragHelper.STATE_IDLE) {
        mCurrentDirection = NONE;
    }
    Log.e("zhou","==============onViewDragStateChanged=================="+state);
    mLastDragState = state;
}
项目：switchbutton    文件：FSwitchButton.java    
/**
 * 根据状态改变view
 *
 * @param anim
 */
private void updateViewByState(boolean anim)
{
    int left = mIsChecked ? getLeftChecked() : getLeftNormal();

    if (mViewThumb.getLeft() != left)
    {
        if (mIsDebug)
        {
            Log.i(TAG, "updateViewByState anim:" + anim);
        }

        if (anim)
        {
            mViewDragHelper.smoothSlideViewTo(mViewThumb, left, mViewThumb.getTop());
        } else
        {
            mViewThumb.layout(left, mViewThumb.getTop(), left + mViewThumb.getMeasuredWidth(), mViewThumb.getBottom());
        }
        invalidate();
    }

    if (mViewDragHelper.getViewDragState() == ViewDragHelper.STATE_SETTLING)
    {
        //触发滚动成功，不需要立即更新view的可见状态，动画结束后更新
        mIsScrollerStarted = true;
    } else
    {
        // 立即更新view的可见状态
        updateViewVisibilityByState();
    }
    mViewThumb.setSelected(mIsChecked);

    if (mOnViewPositionChangedCallback != null)
    {
        mOnViewPositionChangedCallback.onViewPositionChanged(FSwitchButton.this);
    }
}
项目：FriendBook    文件：BaseActivity.java    
protected void onSlideStateChanged(int state) {
    if(getWindowIsTranslucent()){
        return;
    }
    if (state == ViewDragHelper.STATE_DRAGGING) {
        Drawable windowBackground = getWindowBackground();
        if (windowBackground != null) {
            getWindow().setBackgroundDrawable(windowBackground);
        } else {
            getWindow().setBackgroundDrawable(getDefaultWindowBackground());
        }
    }
}
项目：PeSanKita-android    文件：QuickAttachmentDrawer.java    
@Override
public void onViewDragStateChanged(int state) {
  if (dragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE) {
    setDrawerState(drawerState);
    slideOffset = getTargetSlideOffset();
    requestLayout();
  }
}
项目：FabulousFilter    文件：ViewPagerBottomSheetBehavior.java    
@Override
public boolean onLayoutChild(CoordinatorLayout parent, V child, int layoutDirection) {
    if (ViewCompat.getFitsSystemWindows(parent) && !ViewCompat.getFitsSystemWindows(child)) {
        ViewCompat.setFitsSystemWindows(child, true);
    }
    int savedTop = child.getTop();
    // First let the parent lay it out
    parent.onLayoutChild(child, layoutDirection);
    // Offset the bottom sheet
    mParentHeight = parent.getHeight();
    int peekHeight;
    if (mPeekHeightAuto) {
        if (mPeekHeightMin == 0) {
            mPeekHeightMin = parent.getResources().getDimensionPixelSize(
                    R.dimen.design_bottom_sheet_peek_height_min);
        }
        peekHeight = Math.max(mPeekHeightMin, mParentHeight - parent.getWidth() * 9 / 16);
    } else {
        peekHeight = mPeekHeight;
    }
    mMinOffset = Math.max(0, mParentHeight - child.getHeight());
    mMaxOffset = Math.max(mParentHeight - peekHeight, mMinOffset);
    if (mState == STATE_EXPANDED) {
        ViewCompat.offsetTopAndBottom(child, mMinOffset);
    } else if (mHideable && mState == STATE_HIDDEN) {
        ViewCompat.offsetTopAndBottom(child, mParentHeight);
    } else if (mState == STATE_COLLAPSED) {
        ViewCompat.offsetTopAndBottom(child, mMaxOffset);
    } else if (mState == STATE_DRAGGING || mState == STATE_SETTLING) {
        ViewCompat.offsetTopAndBottom(child, savedTop - child.getTop());
    }
    if (mViewDragHelper == null) {
        mViewDragHelper = ViewDragHelper.create(parent, mDragCallback);
    }
    mViewRef = new WeakReference<>(child);
    mNestedScrollingChildRef = new WeakReference<>(findScrollingChild(child));
    return true;
}
项目：FabulousFilter    文件：ViewPagerBottomSheetBehavior.java    
private void reset() {
    mActivePointerId = ViewDragHelper.INVALID_POINTER;
    if (mVelocityTracker != null) {
        mVelocityTracker.recycle();
        mVelocityTracker = null;
    }
}
项目：Cable-Android    文件：QuickAttachmentDrawer.java    
@Override
public void onViewDragStateChanged(int state) {
  if (dragHelper.getViewDragState() == ViewDragHelper.STATE_IDLE) {
    setDrawerState(drawerState);
    slideOffset = getTargetSlideOffset();
    requestLayout();
  }
}
项目：Discover    文件：SnakeButtonLayout.java    
public SnakeButtonLayout(Context context, AttributeSet attrs) {
    super(context, attrs);
    marginRight = PUtils.getInstance().getMarginRight();
    marginBottom = PUtils.getInstance().getMarginBottom();
    isVisible = PUtils.getInstance().getVisible();
    mDragHelper = ViewDragHelper.create(this, 10f, new MyViewDragCallBack());
    controller = ViewController.getInstance();
}
项目：TestChat    文件：DragLayout.java    
public DragLayout(Context context, AttributeSet attrs, int defStyleAttr) {
                super(context, attrs, defStyleAttr);
                mGestureDetector = new GestureDetector(context, new SimpleOnGestureListener() {
                        @Override
                        public boolean onScroll(MotionEvent e1, MotionEvent e2, float distanceX, float distanceY) {
//                                如果水平方向的偏移量大于竖直方向的偏移量，就消化该事件,
                                return Math.abs(distanceX) > Math.abs(distanceY) || super.onScroll(e1, e2, distanceX, distanceY);

                        }
                });
//                永远要记得，该工具实现的拖拉是基于控件位置的改变来实现的
                mViewDragHelper = ViewDragHelper.create(this, new DragViewCallBack());
        }
项目：TestChat    文件：DragLayout.java    
@Override
        public boolean onInterceptTouchEvent(MotionEvent ev) {
//                如果符合条件直接截获事件由自己在onTouchEvent方法中处理
//                如果在释放自动滑动的过程中点击，会导致停止动画
                boolean result = mViewDragHelper.shouldInterceptTouchEvent(ev) && mGestureDetector.onTouchEvent(ev);
//                这里是为了防止在滑动的过程中,突然点击,导致被点击的页面停止滑动的的情况发生
                if (!result && mViewDragHelper.getViewDragState() == ViewDragHelper.STATE_DRAGGING && ev.getAction() == MotionEvent.ACTION_UP) {
                        if (getChildAt(2).getLeft() < range / 2) {
                                closeMenu();
                        } else {
                                openMenu();
                        }
                }
                return result;
        }