Package 

Class ViewPager

  • All Implemented Interfaces:
    android.graphics.drawable.Drawable.Callback , android.view.KeyEvent.Callback , android.view.ViewManager , android.view.ViewParent , android.view.accessibility.AccessibilityEventSource 
    
public class ViewPager
extends ViewGroup

    Layout manager that allows the user to flip left and right through pages of data. You supply an implementation of a PagerAdapter to generate the pages that the view shows.

    ViewPager is most often used in conjunction with android.app.Fragment, which is a convenient way to supply and manage the lifecycle of each page. There are standard adapters implemented for using fragments with the ViewPager, which cover the most common use cases. These are classes have simple code showing how to build a full user interface with them.

    Views which are annotated with the DecorView annotation are treated as part of the view pagers 'decor'. Each decor view's position can be controlled via its {@code android:layout_gravity} attribute. For example: 

    <android.support.v4.view.ViewPager
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v4.view.PagerTitleStrip
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="top" />

</android.support.v4.view.ViewPager>

    For more information about how to use ViewPager, read Creating Swipe Views with Tabs.

    You can find examples of using ViewPager in the API 4+ Support Demos and API 13+ Support Demos sample code.

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description
      public interface ViewPager.OnPageChangeListener

      Callback interface for responding to changing state of the selected page.
      public class ViewPager.SimpleOnPageChangeListener

      Simple implementation of the OnPageChangeListener interface with stubimplementations of each method. Extend this if you do not intend to overrideevery method of OnPageChangeListener.
      public interface ViewPager.PageTransformer

      A PageTransformer is invoked whenever a visible/attached page is scrolled.This offers an opportunity for the application to apply a custom transformationto the page views using animation properties.

      As property animation is only supported as of Android 3.0 and forward,setting a PageTransformer on a ViewPager on earlier platform versions willbe ignored.
      public interface ViewPager.OnAdapterChangeListener

      Callback interface for responding to adapter changes.
      public @interface ViewPager.DecorView

      Annotation which allows marking of views to be decoration views when added to a viewpager.

      Views marked with this annotation can be added to the view pager with a layout resource.

      You can also control whether a view is a decor view but setting isDecor on the child's layout params.
      public class ViewPager.SavedState

      This is the persistent state that is saved by ViewPager. Only neededif you are creating a sublass of ViewPager that must save its ownstate, in which case it should implement a subclass of this whichcontains that state.
      public class ViewPager.LayoutParams

      Layout parameters that should be supplied for views added to aViewPager.

    • Method Summary

      Modifier and Type Method Description
      void setAdapter(@Nullable() PagerAdapter adapter) Set a PagerAdapter that will supply views for this pager as needed.
      PagerAdapter getAdapter() Retrieve the current adapter supplying pages.
      void addOnAdapterChangeListener(@NonNull() ViewPager.OnAdapterChangeListener listener) Add a listener that will be invoked whenever the adapter for this ViewPager changes.
      void removeOnAdapterChangeListener(@NonNull() ViewPager.OnAdapterChangeListener listener) Remove a listener that was previously added via addOnAdapterChangeListener.
      void setCurrentItem(int item) Set the currently selected page.
      void setCurrentItem(int item, boolean smoothScroll) Set the currently selected page.
      int getCurrentItem()
      void setOnPageChangeListener(ViewPager.OnPageChangeListener listener) Set a listener that will be invoked whenever the page changes or is incrementallyscrolled.
      void addOnPageChangeListener(@NonNull() ViewPager.OnPageChangeListener listener) Add a listener that will be invoked whenever the page changes or is incrementallyscrolled.
      void removeOnPageChangeListener(@NonNull() ViewPager.OnPageChangeListener listener) Remove a listener that was previously added via addOnPageChangeListener.
      void clearOnPageChangeListeners() Remove all listeners that are notified of any changes in scroll state or position.
      void setPageTransformer(boolean reverseDrawingOrder, @Nullable() ViewPager.PageTransformer transformer) Sets a PageTransformer that will be called for each attached page wheneverthe scroll position is changed.
      void setPageTransformer(boolean reverseDrawingOrder, @Nullable() ViewPager.PageTransformer transformer, int pageLayerType) Sets a PageTransformer that will be called for each attached page wheneverthe scroll position is changed.
      int getOffscreenPageLimit() Returns the number of pages that will be retained to either side of thecurrent page in the view hierarchy in an idle state.
      void setOffscreenPageLimit(int limit) Set the number of pages that should be retained to either side of thecurrent page in the view hierarchy in an idle state.
      void setPageMargin(int marginPixels) Set the margin between pages.
      int getPageMargin() Return the margin between pages.
      void setPageMarginDrawable(@Nullable() Drawable d) Set a drawable that will be used to fill the margin between pages.
      void setPageMarginDrawable(@DrawableRes() int resId) Set a drawable that will be used to fill the margin between pages.
      Parcelable onSaveInstanceState()
      void onRestoreInstanceState(Parcelable state)
      void addView(View child, int index, ViewGroup.LayoutParams params)
      void removeView(View view)
      void computeScroll()
      boolean onInterceptTouchEvent(MotionEvent ev)
      boolean onTouchEvent(MotionEvent ev)
      void draw(Canvas canvas)
      boolean beginFakeDrag() Start a fake drag of the pager.
      void endFakeDrag() End a fake drag of the pager.
      void fakeDragBy(float xOffset) Fake drag by an offset in pixels.
      boolean isFakeDragging() Returns true if a fake drag is in progress.
      boolean canScrollHorizontally(int direction) Check if this ViewPager can be scrolled horizontally in a certain direction.
      boolean dispatchKeyEvent(KeyEvent event)
      boolean executeKeyEvent(@NonNull() KeyEvent event) You can call this function yourself to have the scroll view performscrolling from a key event, just as if the event had been dispatched toit by the view hierarchy.
      boolean arrowScroll(int direction) Handle scrolling in response to a left or right arrow click.
      void addFocusables(ArrayList<View> views, int direction, int focusableMode) We only want the current page that is being shown to be focusable.
      void addTouchables(ArrayList<View> views) We only want the current page that is being shown to be touchable.
      ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs)

      • Methods inherited from class android.view.ViewGroup

        addChildrenForAccessibility, addExtraDataToAccessibilityNodeInfo, addFocusables, addKeyboardNavigationClusters, addStatesFromChildren, addTouchables, addView, bringChildToFront, childDrawableStateChanged, childHasTransientStateChanged, clearChildFocus, clearDisappearingChildren, clearFocus, dispatchApplyWindowInsets, dispatchCapturedPointerEvent, dispatchConfigurationChanged, dispatchDisplayHint, dispatchDragEvent, dispatchDrawableHotspotChanged, dispatchFinishTemporaryDetach, dispatchKeyEvent, dispatchKeyEventPreIme, dispatchKeyShortcutEvent, dispatchPointerCaptureChanged, dispatchProvideAutofillStructure, dispatchProvideStructure, dispatchSetActivated, dispatchSetSelected, dispatchStartTemporaryDetach, dispatchSystemUiVisibilityChanged, dispatchTouchEvent, dispatchTrackballEvent, dispatchUnhandledMove, dispatchWindowFocusChanged, dispatchWindowInsetsAnimationEnd, dispatchWindowInsetsAnimationPrepare, dispatchWindowInsetsAnimationProgress, dispatchWindowInsetsAnimationStart, dispatchWindowSystemUiVisiblityChanged, dispatchWindowVisibilityChanged, endViewTransition, findFocus, findViewsWithText, focusSearch, focusableViewAvailable, gatherTransparentRegion, generateLayoutParams, getAccessibilityClassName, getChildAt, getChildCount, getChildMeasureSpec, getChildVisibleRect, getClipChildren, getClipToPadding, getDescendantFocusability, getFocusedChild, getLayoutAnimation, getLayoutAnimationListener, getLayoutMode, getLayoutTransition, getNestedScrollAxes, getOverlay, getPersistentDrawingCache, getTouchscreenBlocksFocus, hasFocus, hasTransientState, indexOfChild, invalidateChild, invalidateChildInParent, isAlwaysDrawnWithCacheEnabled, isAnimationCacheEnabled, isLayoutSuppressed, isMotionEventSplittingEnabled, isTransitionGroup, jumpDrawablesToCurrentState, layout, notifySubtreeAccessibilityStateChanged, offsetDescendantRectToMyCoords, offsetRectIntoDescendantCoords, onDescendantInvalidated, onInterceptHoverEvent, onInterceptTouchEvent, onNestedFling, onNestedPreFling, onNestedPrePerformAccessibilityAction, onNestedPreScroll, onNestedScroll, onNestedScrollAccepted, onRequestSendAccessibilityEvent, onResolvePointerIcon, onStartNestedScroll, onStopNestedScroll, onViewAdded, onViewRemoved, recomputeViewAttributes, removeAllViews, removeAllViewsInLayout, removeView, removeViewAt, removeViewInLayout, removeViews, removeViewsInLayout, requestChildFocus, requestChildRectangleOnScreen, requestDisallowInterceptTouchEvent, requestFocus, requestSendAccessibilityEvent, requestTransparentRegion, restoreDefaultFocus, scheduleLayoutAnimation, setAddStatesFromChildren, setAlwaysDrawnWithCacheEnabled, setAnimationCacheEnabled, setClipChildren, setClipToPadding, setDescendantFocusability, setLayoutAnimation, setLayoutAnimationListener, setLayoutMode, setLayoutTransition, setMotionEventSplittingEnabled, setOnHierarchyChangeListener, setPersistentDrawingCache, setTouchscreenBlocksFocus, setTransitionGroup, setWindowInsetsAnimationCallback, shouldDelayChildPressedState, showContextMenuForChild, startActionModeForChild, startLayoutAnimation, startViewTransition, suppressLayout, updateViewLayout

      • Methods inherited from class android.view.View

        addOnAttachStateChangeListener, addOnLayoutChangeListener, addOnUnhandledKeyEventListener, animate, announceForAccessibility, autofill, bringToFront, buildDrawingCache, buildLayer, callOnClick, canResolveLayoutDirection, canResolveTextAlignment, canResolveTextDirection, canScrollHorizontally, canScrollVertically, cancelDragAndDrop, cancelLongPress, cancelPendingInputEvents, checkInputConnectionProxy, clearAnimation, combineMeasuredStates, computeScroll, computeSystemWindowInsets, createAccessibilityNodeInfo, createContextMenu, destroyDrawingCache, dispatchGenericMotionEvent, dispatchNestedFling, dispatchNestedPreFling, dispatchNestedPrePerformAccessibilityAction, dispatchNestedPreScroll, dispatchNestedScroll, dispatchPopulateAccessibilityEvent, draw, drawableHotspotChanged, findViewById, findViewWithTag, forceHasOverlappingRendering, forceLayout, generateViewId, getAccessibilityDelegate, getAccessibilityLiveRegion, getAccessibilityNodeProvider, getAccessibilityPaneTitle, getAccessibilityTraversalAfter, getAccessibilityTraversalBefore, getAlpha, getAnimation, getAnimationMatrix, getApplicationWindowToken, getAttributeResolutionStack, getAttributeSourceResourceMap, getAutofillHints, getAutofillId, getAutofillType, getAutofillValue, getBackground, getBackgroundTintBlendMode, getBackgroundTintList, getBackgroundTintMode, getBaseline, getBottom, getCameraDistance, getClipBounds, getClipBounds, getClipToOutline, getContentCaptureSession, getContentDescription, getContext, getDefaultFocusHighlightEnabled, getDefaultSize, getDisplay, getDrawableState, getDrawingCache, getDrawingCacheBackgroundColor, getDrawingCacheQuality, getDrawingRect, getDrawingTime, getElevation, getExplicitStyle, getFilterTouchesWhenObscured, getFitsSystemWindows, getFocusable, getFocusables, getFocusedRect, getForeground, getForegroundGravity, getForegroundTintBlendMode, getForegroundTintList, getForegroundTintMode, getGlobalVisibleRect, getHandler, getHasOverlappingRendering, getHeight, getHitRect, getHorizontalFadingEdgeLength, getHorizontalScrollbarThumbDrawable, getHorizontalScrollbarTrackDrawable, getId, getImportantForAccessibility, getImportantForAutofill, getImportantForContentCapture, getKeepScreenOn, getKeyDispatcherState, getLabelFor, getLayerType, getLayoutDirection, getLayoutParams, getLeft, getLocalVisibleRect, getLocationInSurface, getLocationInWindow, getLocationOnScreen, getMatrix, getMeasuredHeight, getMeasuredHeightAndState, getMeasuredState, getMeasuredWidth, getMeasuredWidthAndState, getMinimumHeight, getMinimumWidth, getNextClusterForwardId, getNextFocusDownId, getNextFocusForwardId, getNextFocusLeftId, getNextFocusRightId, getNextFocusUpId, getOnFocusChangeListener, getOutlineAmbientShadowColor, getOutlineProvider, getOutlineSpotShadowColor, getOverScrollMode, getOverlay, getPaddingBottom, getPaddingEnd, getPaddingLeft, getPaddingRight, getPaddingStart, getPaddingTop, getParent, getParentForAccessibility, getPivotX, getPivotY, getPointerIcon, getResources, getRevealOnFocusHint, getRight, getRootView, getRootWindowInsets, getRotation, getRotationX, getRotationY, getScaleX, getScaleY, getScrollBarDefaultDelayBeforeFade, getScrollBarFadeDuration, getScrollBarSize, getScrollBarStyle, getScrollIndicators, getScrollX, getScrollY, getSolidColor, getSourceLayoutResId, getStateDescription, getStateListAnimator, getSystemGestureExclusionRects, getSystemUiVisibility, getTag, getTextAlignment, getTextDirection, getTooltipText, getTop, getTouchDelegate, getTouchables, getTransitionAlpha, getTransitionName, getTranslationX, getTranslationY, getTranslationZ, getUniqueDrawingId, getVerticalFadingEdgeLength, getVerticalScrollbarPosition, getVerticalScrollbarThumbDrawable, getVerticalScrollbarTrackDrawable, getVerticalScrollbarWidth, getViewTreeObserver, getVisibility, getWidth, getWindowId, getWindowInsetsController, getWindowSystemUiVisibility, getWindowToken, getWindowVisibility, getWindowVisibleDisplayFrame, getX, getY, getZ, hasExplicitFocusable, hasFocusable, hasNestedScrollingParent, hasOnClickListeners, hasOnLongClickListeners, hasOverlappingRendering, hasPointerCapture, hasWindowFocus, inflate, invalidate, invalidateDrawable, invalidateOutline, isAccessibilityFocused, isAccessibilityHeading, isActivated, isAttachedToWindow, isClickable, isContextClickable, isDirty, isDrawingCacheEnabled, isDuplicateParentStateEnabled, isEnabled, isFocusable, isFocusableInTouchMode, isFocused, isFocusedByDefault, isForceDarkAllowed, isHapticFeedbackEnabled, isHardwareAccelerated, isHorizontalFadingEdgeEnabled, isHorizontalScrollBarEnabled, isHovered, isImportantForAccessibility, isImportantForAutofill, isImportantForContentCapture, isInEditMode, isInLayout, isInTouchMode, isKeyboardNavigationCluster, isLaidOut, isLayoutDirectionResolved, isLayoutRequested, isLongClickable, isNestedScrollingEnabled, isOpaque, isPaddingRelative, isPivotSet, isPressed, isSaveEnabled, isSaveFromParentEnabled, isScreenReaderFocusable, isScrollContainer, isScrollbarFadingEnabled, isSelected, isShowingLayoutBounds, isShown, isSoundEffectsEnabled, isTemporarilyDetached, isTextAlignmentResolved, isTextDirectionResolved, isVerticalFadingEdgeEnabled, isVerticalScrollBarEnabled, isVisibleToUserForAutofill, keyboardNavigationClusterSearch, measure, offsetLeftAndRight, offsetTopAndBottom, onApplyWindowInsets, onCancelPendingInputEvents, onCapturedPointerEvent, onCheckIsTextEditor, onCreateInputConnection, onDragEvent, onDrawForeground, onFilterTouchEventForSecurity, onFinishTemporaryDetach, onGenericMotionEvent, onHoverChanged, onHoverEvent, onInitializeAccessibilityEvent, onInitializeAccessibilityNodeInfo, onKeyDown, onKeyLongPress, onKeyMultiple, onKeyPreIme, onKeyShortcut, onKeyUp, onPointerCaptureChange, onPopulateAccessibilityEvent, onProvideAutofillStructure, onProvideAutofillVirtualStructure, onProvideContentCaptureStructure, onProvideStructure, onProvideVirtualStructure, onRtlPropertiesChanged, onScreenStateChanged, onStartTemporaryDetach, onTouchEvent, onTrackballEvent, onVisibilityAggregated, onWindowFocusChanged, onWindowSystemUiVisibilityChanged, performAccessibilityAction, performClick, performContextClick, performHapticFeedback, performLongClick, playSoundEffect, post, postDelayed, postInvalidate, postInvalidateDelayed, postInvalidateOnAnimation, postOnAnimation, postOnAnimationDelayed, refreshDrawableState, releasePointerCapture, removeCallbacks, removeOnAttachStateChangeListener, removeOnLayoutChangeListener, removeOnUnhandledKeyEventListener, requestApplyInsets, requestFitSystemWindows, requestFocusFromTouch, requestLayout, requestPointerCapture, requestRectangleOnScreen, requestUnbufferedDispatch, requireViewById, resetPivot, resolveSize, resolveSizeAndState, restoreHierarchyState, saveAttributeDataForStyleable, saveHierarchyState, scheduleDrawable, scrollBy, scrollTo, sendAccessibilityEvent, sendAccessibilityEventUnchecked, setAccessibilityDelegate, setAccessibilityHeading, setAccessibilityLiveRegion, setAccessibilityPaneTitle, setAccessibilityTraversalAfter, setAccessibilityTraversalBefore, setActivated, setAlpha, setAnimation, setAnimationMatrix, setAutofillHints, setAutofillId, setBackground, setBackgroundColor, setBackgroundDrawable, setBackgroundResource, setBackgroundTintBlendMode, setBackgroundTintList, setBackgroundTintMode, setBottom, setCameraDistance, setClickable, setClipBounds, setClipToOutline, setContentCaptureSession, setContentDescription, setContextClickable, setDefaultFocusHighlightEnabled, setDrawingCacheBackgroundColor, setDrawingCacheEnabled, setDrawingCacheQuality, setDuplicateParentStateEnabled, setElevation, setEnabled, setFadingEdgeLength, setFilterTouchesWhenObscured, setFitsSystemWindows, setFocusable, setFocusableInTouchMode, setFocusedByDefault, setForceDarkAllowed, setForeground, setForegroundGravity, setForegroundTintBlendMode, setForegroundTintList, setForegroundTintMode, setHapticFeedbackEnabled, setHasTransientState, setHorizontalFadingEdgeEnabled, setHorizontalScrollBarEnabled, setHorizontalScrollbarThumbDrawable, setHorizontalScrollbarTrackDrawable, setHovered, setId, setImportantForAccessibility, setImportantForAutofill, setImportantForContentCapture, setKeepScreenOn, setKeyboardNavigationCluster, setLabelFor, setLayerPaint, setLayerType, setLayoutDirection, setLayoutParams, setLeft, setLeftTopRightBottom, setLongClickable, setMinimumHeight, setMinimumWidth, setNestedScrollingEnabled, setNextClusterForwardId, setNextFocusDownId, setNextFocusForwardId, setNextFocusLeftId, setNextFocusRightId, setNextFocusUpId, setOnApplyWindowInsetsListener, setOnCapturedPointerListener, setOnClickListener, setOnContextClickListener, setOnCreateContextMenuListener, setOnDragListener, setOnFocusChangeListener, setOnGenericMotionListener, setOnHoverListener, setOnKeyListener, setOnLongClickListener, setOnScrollChangeListener, setOnSystemUiVisibilityChangeListener, setOnTouchListener, setOutlineAmbientShadowColor, setOutlineProvider, setOutlineSpotShadowColor, setOverScrollMode, setPadding, setPaddingRelative, setPivotX, setPivotY, setPointerIcon, setPressed, setRevealOnFocusHint, setRight, setRotation, setRotationX, setRotationY, setSaveEnabled, setSaveFromParentEnabled, setScaleX, setScaleY, setScreenReaderFocusable, setScrollBarDefaultDelayBeforeFade, setScrollBarFadeDuration, setScrollBarSize, setScrollBarStyle, setScrollContainer, setScrollIndicators, setScrollX, setScrollY, setScrollbarFadingEnabled, setSelected, setSoundEffectsEnabled, setStateDescription, setStateListAnimator, setSystemGestureExclusionRects, setSystemUiVisibility, setTag, setTextAlignment, setTextDirection, setTooltipText, setTop, setTouchDelegate, setTransitionAlpha, setTransitionName, setTransitionVisibility, setTranslationX, setTranslationY, setTranslationZ, setVerticalFadingEdgeEnabled, setVerticalScrollBarEnabled, setVerticalScrollbarPosition, setVerticalScrollbarThumbDrawable, setVerticalScrollbarTrackDrawable, setVisibility, setWillNotCacheDrawing, setWillNotDraw, setX, setY, setZ, showContextMenu, startActionMode, startAnimation, startDrag, startDragAndDrop, startNestedScroll, stopNestedScroll, toString, transformMatrixToGlobal, transformMatrixToLocal, unscheduleDrawable, updateDragShadow, willNotCacheDrawing, willNotDraw

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

    • Method Detail

      • setAdapter

         void setAdapter(@Nullable() PagerAdapter adapter)

        Set a PagerAdapter that will supply views for this pager as needed.

        Parameters:
        adapter - Adapter to use

      • setCurrentItem

         void setCurrentItem(int item)

        Set the currently selected page. If the ViewPager has already been through its firstlayout with its current adapter there will be a smooth animated transition betweenthe current item and the specified item.

        Parameters:
        item - Item index to select

      • setCurrentItem

         void setCurrentItem(int item, boolean smoothScroll)

        Set the currently selected page.

        Parameters:
        item - Item index to select
        smoothScroll - True to smoothly scroll to the new item, false to transition immediately

      • clearOnPageChangeListeners

         void clearOnPageChangeListeners()

        Remove all listeners that are notified of any changes in scroll state or position.

      • setPageTransformer

         void setPageTransformer(boolean reverseDrawingOrder, @Nullable() ViewPager.PageTransformer transformer)

        Sets a PageTransformer that will be called for each attached page wheneverthe scroll position is changed. This allows the application to apply custom propertytransformations to each page, overriding the default sliding behavior.

        Note: By default, calling this method will cause contained pages to use LAYER_TYPE_HARDWARE. This layer type allows custom alpha transformations,but it will cause issues if any of your pages contain a android.view.SurfaceView and you have not called setZOrderOnTop to put that android.view.SurfaceView above your app content. To disable this behavior, call setPageTransformer and pass LAYER_TYPE_NONE for {@code pageLayerType}.

        Parameters:
        reverseDrawingOrder - true if the supplied PageTransformer requires page viewsto be drawn from last to first instead of first to last.
        transformer - PageTransformer that will modify each page's animation properties

      • setPageTransformer

         void setPageTransformer(boolean reverseDrawingOrder, @Nullable() ViewPager.PageTransformer transformer, int pageLayerType)

        Sets a PageTransformer that will be called for each attached page wheneverthe scroll position is changed. This allows the application to apply custom propertytransformations to each page, overriding the default sliding behavior.

        Parameters:
        reverseDrawingOrder - true if the supplied PageTransformer requires page viewsto be drawn from last to first instead of first to last.
        transformer - PageTransformer that will modify each page's animation properties
        pageLayerType - View layer type that should be used for ViewPager pages.

      • getOffscreenPageLimit

         int getOffscreenPageLimit()

        Returns the number of pages that will be retained to either side of thecurrent page in the view hierarchy in an idle state. Defaults to 1.

      • setOffscreenPageLimit

         void setOffscreenPageLimit(int limit)

        Set the number of pages that should be retained to either side of thecurrent page in the view hierarchy in an idle state. Pages beyond thislimit will be recreated from the adapter when needed.

        This is offered as an optimization. If you know in advance the numberof pages you will need to support or have lazy-loading mechanisms in placeon your pages, tweaking this setting can have benefits in perceived smoothnessof paging animations and interaction. If you have a small number of pages (3-4)that you can keep active all at once, less time will be spent in layout fornewly created view subtrees as the user pages back and forth.

        You should keep this limit low, especially if your pages have complex layouts.This setting defaults to 1.

        Parameters:
        limit - How many pages will be kept offscreen in an idle state.

      • setPageMargin

         void setPageMargin(int marginPixels)

        Set the margin between pages.

        Parameters:
        marginPixels - Distance between adjacent pages in pixels

      • getPageMargin

         int getPageMargin()

        Return the margin between pages.

      • setPageMarginDrawable

         void setPageMarginDrawable(@Nullable() Drawable d)

        Set a drawable that will be used to fill the margin between pages.

        Parameters:
        d - Drawable to display between pages

      • setPageMarginDrawable

         void setPageMarginDrawable(@DrawableRes() int resId)

        Set a drawable that will be used to fill the margin between pages.

        Parameters:
        resId - Resource ID of a drawable to display between pages

      • beginFakeDrag

         boolean beginFakeDrag()

        Start a fake drag of the pager.

        A fake drag can be useful if you want to synchronize the motion of the ViewPagerwith the touch scrolling of another view, while still letting the ViewPagercontrol the snapping motion and fling behavior. (e.g. parallax-scrolling tabs.)Call fakeDragBy to simulate the actual drag motion. Call endFakeDrag to complete the fake drag and fling as necessary.

        During a fake drag the ViewPager will ignore all touch events. If a real dragis already in progress, this method will return false.

      • endFakeDrag

         void endFakeDrag()

        End a fake drag of the pager.

      • fakeDragBy

         void fakeDragBy(float xOffset)

        Fake drag by an offset in pixels. You must have called beginFakeDrag first.

        Parameters:
        xOffset - Offset in pixels to drag by.

      • isFakeDragging

         boolean isFakeDragging()

        Returns true if a fake drag is in progress.

      • canScrollHorizontally

         boolean canScrollHorizontally(int direction)

        Check if this ViewPager can be scrolled horizontally in a certain direction.

        Parameters:
        direction - Negative to check scrolling left, positive to check scrolling right.

      • executeKeyEvent

         boolean executeKeyEvent(@NonNull() KeyEvent event)

        You can call this function yourself to have the scroll view performscrolling from a key event, just as if the event had been dispatched toit by the view hierarchy.

        Parameters:
        event - The key event to execute.

      • arrowScroll

         boolean arrowScroll(int direction)

        Handle scrolling in response to a left or right arrow click.

        Parameters:
        direction - The direction corresponding to the arrow key that was pressed.

      • addFocusables

         void addFocusables(ArrayList<View> views, int direction, int focusableMode)

        We only want the current page that is being shown to be focusable.