am 14823d60: am 72a04431: am 71b0cb04: Merge "Add scroll indicators on View,... (8876e444) · Commits · e / os / android_frameworks_base

api/current.txt

+11 −0

Original line number	Diff line number	Diff line
		@@ -1050,6 +1050,7 @@ package android {
		field public static final int screenOrientation = 16842782; // 0x101001e
		field public static final int screenSize = 16843466; // 0x10102ca
		field public static final int scrollHorizontally = 16843099; // 0x101015b
		field public static final int scrollIndicators = 16844023; // 0x10104f7
		field public static final int scrollViewStyle = 16842880; // 0x1010080
		field public static final int scrollX = 16842962; // 0x10100d2
		field public static final int scrollY = 16842963; // 0x10100d3
		@@ -36214,6 +36215,7 @@ package android.view {
		method public int getScrollBarFadeDuration();
		method public int getScrollBarSize();
		method public int getScrollBarStyle();
		method public int getScrollIndicators();
		method public final int getScrollX();
		method public final int getScrollY();
		method public int getSolidColor();
		@@ -36295,6 +36297,7 @@ package android.view {
		method public boolean isSaveEnabled();
		method public boolean isSaveFromParentEnabled();
		method public boolean isScrollContainer();
		method public boolean isScrollIndicatorEnabled(int);
		method public boolean isScrollbarFadingEnabled();
		method public boolean isSelected();
		method public boolean isShown();
		@@ -36494,6 +36497,8 @@ package android.view {
		method public void setScrollBarSize(int);
		method public void setScrollBarStyle(int);
		method public void setScrollContainer(boolean);
		method public void setScrollIndicators(int);
		method public void setScrollIndicators(int, int);
		method public void setScrollX(int);
		method public void setScrollY(int);
		method public void setScrollbarFadingEnabled(boolean);
		@@ -36619,6 +36624,12 @@ package android.view {
		field public static final int SCROLL_AXIS_HORIZONTAL = 1; // 0x1
		field public static final int SCROLL_AXIS_NONE = 0; // 0x0
		field public static final int SCROLL_AXIS_VERTICAL = 2; // 0x2
		field public static final int SCROLL_INDICATOR_BOTTOM = 2; // 0x2
		field public static final int SCROLL_INDICATOR_END = 32; // 0x20
		field public static final int SCROLL_INDICATOR_LEFT = 4; // 0x4
		field public static final int SCROLL_INDICATOR_RIGHT = 8; // 0x8
		field public static final int SCROLL_INDICATOR_START = 16; // 0x10
		field public static final int SCROLL_INDICATOR_TOP = 1; // 0x1
		field protected static final int[] SELECTED_STATE_SET;
		field protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET;
		field public static final int SOUND_EFFECTS_ENABLED = 134217728; // 0x8000000

api/system-current.txt

+11 −0

Original line number	Diff line number	Diff line
		@@ -1122,6 +1122,7 @@ package android {
		field public static final int screenOrientation = 16842782; // 0x101001e
		field public static final int screenSize = 16843466; // 0x10102ca
		field public static final int scrollHorizontally = 16843099; // 0x101015b
		field public static final int scrollIndicators = 16844023; // 0x10104f7
		field public static final int scrollViewStyle = 16842880; // 0x1010080
		field public static final int scrollX = 16842962; // 0x10100d2
		field public static final int scrollY = 16842963; // 0x10100d3
		@@ -38425,6 +38426,7 @@ package android.view {
		method public int getScrollBarFadeDuration();
		method public int getScrollBarSize();
		method public int getScrollBarStyle();
		method public int getScrollIndicators();
		method public final int getScrollX();
		method public final int getScrollY();
		method public int getSolidColor();
		@@ -38506,6 +38508,7 @@ package android.view {
		method public boolean isSaveEnabled();
		method public boolean isSaveFromParentEnabled();
		method public boolean isScrollContainer();
		method public boolean isScrollIndicatorEnabled(int);
		method public boolean isScrollbarFadingEnabled();
		method public boolean isSelected();
		method public boolean isShown();
		@@ -38705,6 +38708,8 @@ package android.view {
		method public void setScrollBarSize(int);
		method public void setScrollBarStyle(int);
		method public void setScrollContainer(boolean);
		method public void setScrollIndicators(int);
		method public void setScrollIndicators(int, int);
		method public void setScrollX(int);
		method public void setScrollY(int);
		method public void setScrollbarFadingEnabled(boolean);
		@@ -38830,6 +38835,12 @@ package android.view {
		field public static final int SCROLL_AXIS_HORIZONTAL = 1; // 0x1
		field public static final int SCROLL_AXIS_NONE = 0; // 0x0
		field public static final int SCROLL_AXIS_VERTICAL = 2; // 0x2
		field public static final int SCROLL_INDICATOR_BOTTOM = 2; // 0x2
		field public static final int SCROLL_INDICATOR_END = 32; // 0x20
		field public static final int SCROLL_INDICATOR_LEFT = 4; // 0x4
		field public static final int SCROLL_INDICATOR_RIGHT = 8; // 0x8
		field public static final int SCROLL_INDICATOR_START = 16; // 0x10
		field public static final int SCROLL_INDICATOR_TOP = 1; // 0x1
		field protected static final int[] SELECTED_STATE_SET;
		field protected static final int[] SELECTED_WINDOW_FOCUSED_STATE_SET;
		field public static final int SOUND_EFFECTS_ENABLED = 134217728; // 0x8000000

core/java/android/view/View.java

+339 −0

Original line number	Diff line number	Diff line
		@@ -2395,10 +2395,143 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		*/
		static final int PFLAG3_NESTED_SCROLLING_ENABLED = 0x80;

		/**
		* Flag indicating that the bottom scroll indicator should be displayed
		* when this view can scroll up.
		*/
		static final int PFLAG3_SCROLL_INDICATOR_TOP = 0x0100;

		/**
		* Flag indicating that the bottom scroll indicator should be displayed
		* when this view can scroll down.
		*/
		static final int PFLAG3_SCROLL_INDICATOR_BOTTOM = 0x0200;

		/**
		* Flag indicating that the left scroll indicator should be displayed
		* when this view can scroll left.
		*/
		static final int PFLAG3_SCROLL_INDICATOR_LEFT = 0x0400;

		/**
		* Flag indicating that the right scroll indicator should be displayed
		* when this view can scroll right.
		*/
		static final int PFLAG3_SCROLL_INDICATOR_RIGHT = 0x0800;

		/**
		* Flag indicating that the start scroll indicator should be displayed
		* when this view can scroll in the start direction.
		*/
		static final int PFLAG3_SCROLL_INDICATOR_START = 0x1000;

		/**
		* Flag indicating that the end scroll indicator should be displayed
		* when this view can scroll in the end direction.
		*/
		static final int PFLAG3_SCROLL_INDICATOR_END = 0x2000;

		/* End of masks for mPrivateFlags3 */

		static final int DRAG_MASK = PFLAG2_DRAG_CAN_ACCEPT \| PFLAG2_DRAG_HOVERED;

		static final int SCROLL_INDICATORS_NONE = 0x0000;

		/**
		* Mask for use with setFlags indicating bits used for indicating which
		* scroll indicators are enabled.
		*/
		static final int SCROLL_INDICATORS_PFLAG3_MASK = PFLAG3_SCROLL_INDICATOR_TOP
		\| PFLAG3_SCROLL_INDICATOR_BOTTOM \| PFLAG3_SCROLL_INDICATOR_LEFT
		\| PFLAG3_SCROLL_INDICATOR_RIGHT \| PFLAG3_SCROLL_INDICATOR_START
		\| PFLAG3_SCROLL_INDICATOR_END;

		/**
		* Left-shift required to translate between public scroll indicator flags
		* and internal PFLAGS3 flags. When used as a right-shift, translates
		* PFLAGS3 flags to public flags.
		*/
		static final int SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT = 8;

		/** @hide */
		@Retention(RetentionPolicy.SOURCE)
		@IntDef(flag = true,
		value = {
		SCROLL_INDICATOR_TOP,
		SCROLL_INDICATOR_BOTTOM,
		SCROLL_INDICATOR_LEFT,
		SCROLL_INDICATOR_RIGHT,
		SCROLL_INDICATOR_START,
		SCROLL_INDICATOR_END,
		})
		public @interface ScrollIndicators {}

		/**
		* Scroll indicator direction for the top edge of the view.
		*
		* @see #setScrollIndicators(int)
		* @see #setScrollIndicators(int, int)
		* @see #getScrollIndicators()
		*/
		public static final int SCROLL_INDICATOR_TOP =
		PFLAG3_SCROLL_INDICATOR_TOP >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;

		/**
		* Scroll indicator direction for the bottom edge of the view.
		*
		* @see #setScrollIndicators(int)
		* @see #setScrollIndicators(int, int)
		* @see #getScrollIndicators()
		*/
		public static final int SCROLL_INDICATOR_BOTTOM =
		PFLAG3_SCROLL_INDICATOR_BOTTOM >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;

		/**
		* Scroll indicator direction for the left edge of the view.
		*
		* @see #setScrollIndicators(int)
		* @see #setScrollIndicators(int, int)
		* @see #getScrollIndicators()
		*/
		public static final int SCROLL_INDICATOR_LEFT =
		PFLAG3_SCROLL_INDICATOR_LEFT >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;

		/**
		* Scroll indicator direction for the right edge of the view.
		*
		* @see #setScrollIndicators(int)
		* @see #setScrollIndicators(int, int)
		* @see #getScrollIndicators()
		*/
		public static final int SCROLL_INDICATOR_RIGHT =
		PFLAG3_SCROLL_INDICATOR_RIGHT >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;

		/**
		* Scroll indicator direction for the starting edge of the view.
		* <p>
		* Resolved according to the view's layout direction, see
		* {@link #getLayoutDirection()} for more information.
		*
		* @see #setScrollIndicators(int)
		* @see #setScrollIndicators(int, int)
		* @see #getScrollIndicators()
		*/
		public static final int SCROLL_INDICATOR_START =
		PFLAG3_SCROLL_INDICATOR_START >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;

		/**
		* Scroll indicator direction for the ending edge of the view.
		* <p>
		* Resolved according to the view's layout direction, see
		* {@link #getLayoutDirection()} for more information.
		*
		* @see #setScrollIndicators(int)
		* @see #setScrollIndicators(int, int)
		* @see #getScrollIndicators()
		*/
		public static final int SCROLL_INDICATOR_END =
		PFLAG3_SCROLL_INDICATOR_END >> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;

		/**
		* <p>Indicates that we are allowing {@link android.view.ViewAssistStructure} to traverse
		* into this view.<p>
		@@ -3217,6 +3350,8 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		@ViewDebug.ExportedProperty(deepExport = true, prefix = "fg_")
		private ForegroundInfo mForegroundInfo;

		private Drawable mScrollIndicatorDrawable;

		/**
		* RenderNode used for backgrounds.
		* <p>
		@@ -3769,6 +3904,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		int scrollbarStyle = SCROLLBARS_INSIDE_OVERLAY;
		int overScrollMode = mOverScrollMode;
		boolean initializeScrollbars = false;
		boolean initializeScrollIndicators = false;

		boolean startPaddingDefined = false;
		boolean endPaddingDefined = false;
		@@ -4135,6 +4271,14 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		}
		mForegroundInfo.mInsidePadding = a.getBoolean(attr,
		mForegroundInfo.mInsidePadding);
		case R.styleable.View_scrollIndicators:
		final int scrollIndicators =
		a.getInt(attr, SCROLL_INDICATORS_NONE) & SCROLL_INDICATORS_PFLAG3_MASK;
		if (scrollIndicators != 0) {
		viewFlagValues \|= scrollIndicators;
		viewFlagMasks \|= SCROLL_INDICATORS_PFLAG3_MASK;
		initializeScrollIndicators = true;
		}
		break;
		}
		}
		@@ -4211,6 +4355,10 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		initializeScrollbarsInternal(a);
		}

		if (initializeScrollIndicators) {
		initializeScrollIndicatorsInternal();
		}

		a.recycle();

		// Needs to be called after mViewFlags is set
		@@ -4682,6 +4830,15 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		resolvePadding();
		}

		private void initializeScrollIndicatorsInternal() {
		// Some day maybe we'll break this into top/left/start/etc. and let the
		// client control it. Until then, you can have any scroll indicator you
		// want as long as it's a 1dp foreground-colored rectangle.
		if (mScrollIndicatorDrawable == null) {
		mScrollIndicatorDrawable = mContext.getDrawable(R.drawable.scroll_indicator_material);
		}
		}

		/**
		* <p>
		* Initalizes the scrollability cache if necessary.
		@@ -4721,6 +4878,118 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		return mVerticalScrollbarPosition;
		}

		/**
		* Sets the state of all scroll indicators.
		* <p>
		* See {@link #setScrollIndicators(int, int)} for usage information.
		*
		* @param indicators a bitmask of indicators that should be enabled, or
		* {@code 0} to disable all indicators
		* @see #setScrollIndicators(int, int)
		* @see #getScrollIndicators()
		* @attr ref android.R.styleable#View_scrollIndicators
		*/
		public void setScrollIndicators(@ScrollIndicators int indicators) {
		setScrollIndicators(indicators, SCROLL_INDICATORS_PFLAG3_MASK);
		}

		/**
		* Sets the state of the scroll indicators specified by the mask. To change
		* all scroll indicators at once, see {@link #setScrollIndicators(int)}.
		* <p>
		* When a scroll indicator is enabled, it will be displayed if the view
		* can scroll in the direction of the indicator.
		* <p>
		* Multiple indicator types may be enabled or disabled by passing the
		* logical OR of the desired types. If multiple types are specified, they
		* will all be set to the same enabled state.
		* <p>
		* For example, to enable the top scroll indicatorExample: {@code setScrollIndicators
		*
		* @param indicators the indicator direction, or the logical OR of multiple
		* indicator directions. One or more of:
		* <ul>
		* <li>{@link #SCROLL_INDICATOR_TOP}</li>
		* <li>{@link #SCROLL_INDICATOR_BOTTOM}</li>
		* <li>{@link #SCROLL_INDICATOR_LEFT}</li>
		* <li>{@link #SCROLL_INDICATOR_RIGHT}</li>
		* <li>{@link #SCROLL_INDICATOR_START}</li>
		* <li>{@link #SCROLL_INDICATOR_END}</li>
		* </ul>
		* @see #setScrollIndicators(int)
		* @see #getScrollIndicators()
		* @attr ref android.R.styleable#View_scrollIndicators
		*/
		public void setScrollIndicators(@ScrollIndicators int indicators, @ScrollIndicators int mask) {
		// Shift and sanitize mask.
		mask <<= SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
		mask &= SCROLL_INDICATORS_PFLAG3_MASK;

		// Shift and mask indicators.
		indicators <<= SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
		indicators &= mask;

		// Merge with non-masked flags.
		final int updatedFlags = indicators \| (mPrivateFlags3 & ~mask);

		if (mPrivateFlags3 != updatedFlags) {
		mPrivateFlags3 = updatedFlags;

		if (indicators != 0) {
		initializeScrollIndicatorsInternal();
		}
		invalidate();
		}
		}

		/**
		* Returns a bitmask representing the enabled scroll indicators.
		* <p>
		* For example, if the top and left scroll indicators are enabled and all
		* other indicators are disabled, the return value will be
		* {@code View.SCROLL_INDICATOR_TOP \| View.SCROLL_INDICATOR_LEFT}.
		* <p>
		* To check whether the bottom scroll indicator is enabled, use the value
		* of {@code (getScrollIndicators() & View.SCROLL_INDICATOR_BOTTOM) != 0}.
		*
		* @return a bitmask representing the enabled scroll indicators
		*/
		@ScrollIndicators
		public int getScrollIndicators() {
		return (mPrivateFlags3 & SCROLL_INDICATORS_PFLAG3_MASK)
		>>> SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
		}

		/**
		* Returns whether the specified scroll indicator is enabled.
		* <p>
		* Multiple indicator types may be queried by passing the logical OR of the
		* desired types. If multiple types are specified, the return value
		* represents whether they are all enabled.
		*
		* @param direction the indicator direction, or the logical OR of multiple
		* indicator directions. One or more of:
		* <ul>
		* <li>{@link #SCROLL_INDICATOR_TOP}</li>
		* <li>{@link #SCROLL_INDICATOR_BOTTOM}</li>
		* <li>{@link #SCROLL_INDICATOR_LEFT}</li>
		* <li>{@link #SCROLL_INDICATOR_RIGHT}</li>
		* <li>{@link #SCROLL_INDICATOR_START}</li>
		* <li>{@link #SCROLL_INDICATOR_END}</li>
		* </ul>
		* @return {@code true} if the specified indicator(s) are enabled,
		* {@code false} otherwise
		* @attr ref android.R.styleable#View_scrollIndicators
		*/
		public boolean isScrollIndicatorEnabled(int direction) {
		// Shift and sanitize input.
		direction <<= SCROLL_INDICATORS_TO_PFLAGS3_LSHIFT;
		direction &= SCROLL_INDICATORS_PFLAG3_MASK;

		// All of the flags must be set.
		return (mPrivateFlags3 & direction) == direction;
		}

		ListenerInfo getListenerInfo() {
		if (mListenerInfo != null) {
		return mListenerInfo;
		@@ -13444,6 +13713,75 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		}
		}

		void getScrollIndicatorBounds(@NonNull Rect out) {
		out.left = mScrollX;
		out.right = mScrollX + mRight - mLeft;
		out.top = mScrollY;
		out.bottom = mScrollY + mBottom - mTop;
		}

		private void onDrawScrollIndicators(Canvas c) {
		if ((mPrivateFlags3 & SCROLL_INDICATORS_PFLAG3_MASK) == 0) {
		// No scroll indicators enabled.
		return;
		}

		final Drawable dr = mScrollIndicatorDrawable;
		if (dr == null) {
		// Scroll indicators aren't supported here.
		return;
		}

		final int h = dr.getIntrinsicHeight();
		final int w = dr.getIntrinsicWidth();
		final Rect rect = mAttachInfo.mTmpInvalRect;
		getScrollIndicatorBounds(rect);

		if ((mPrivateFlags3 & PFLAG3_SCROLL_INDICATOR_TOP) != 0) {
		final boolean canScrollUp = canScrollVertically(-1);
		if (canScrollUp) {
		dr.setBounds(rect.left, rect.top, rect.right, rect.top + h);
		dr.draw(c);
		}
		}

		if ((mPrivateFlags3 & PFLAG3_SCROLL_INDICATOR_BOTTOM) != 0) {
		final boolean canScrollDown = canScrollVertically(1);
		if (canScrollDown) {
		dr.setBounds(rect.left, rect.bottom - h, rect.right, rect.bottom);
		dr.draw(c);
		}
		}

		final int leftRtl;
		final int rightRtl;
		if (getLayoutDirection() == LAYOUT_DIRECTION_RTL) {
		leftRtl = PFLAG3_SCROLL_INDICATOR_END;
		rightRtl = PFLAG3_SCROLL_INDICATOR_START;
		} else {
		leftRtl = PFLAG3_SCROLL_INDICATOR_START;
		rightRtl = PFLAG3_SCROLL_INDICATOR_END;
		}

		final int leftMask = PFLAG3_SCROLL_INDICATOR_LEFT \| leftRtl;
		if ((mPrivateFlags3 & leftMask) != 0) {
		final boolean canScrollLeft = canScrollHorizontally(-1);
		if (canScrollLeft) {
		dr.setBounds(rect.left, rect.top, rect.left + w, rect.bottom);
		dr.draw(c);
		}
		}

		final int rightMask = PFLAG3_SCROLL_INDICATOR_RIGHT \| rightRtl;
		if ((mPrivateFlags3 & rightMask) != 0) {
		final boolean canScrollRight = canScrollHorizontally(1);
		if (canScrollRight) {
		dr.setBounds(rect.right - w, rect.top, rect.right, rect.bottom);
		dr.draw(c);
		}
		}
		}

		/**
		* <p>Request the drawing of the horizontal and the vertical scrollbar. The
		* scrollbars are painted only if they have been awakened first.</p>
		@@ -17272,6 +17610,7 @@ public class View implements Drawable.Callback, KeyEvent.Callback,
		* @param canvas canvas to draw into
		*/
		public void onDrawForeground(Canvas canvas) {
		onDrawScrollIndicators(canvas);
		onDrawScrollBars(canvas);

		final Drawable foreground = mForegroundInfo != null ? mForegroundInfo.mDrawable : null;

core/java/android/view/ViewGroup.java

+16 −0

Original line number	Diff line number	Diff line
		@@ -18,6 +18,7 @@ package android.view;

		import android.animation.LayoutTransition;
		import android.annotation.IdRes;
		import android.annotation.NonNull;
		import android.annotation.UiThread;
		import android.content.Context;
		import android.content.Intent;
		@@ -3547,6 +3548,21 @@ public abstract class ViewGroup extends View implements ViewParent, ViewManager
		return child.draw(canvas, this, drawingTime);
		}

		@Override
		void getScrollIndicatorBounds(@NonNull Rect out) {
		super.getScrollIndicatorBounds(out);

		// If we have padding and we're supposed to clip children to that
		// padding, offset the scroll indicators to match our clip bounds.
		final boolean clipToPadding = (mGroupFlags & CLIP_TO_PADDING_MASK) == CLIP_TO_PADDING_MASK;
		if (clipToPadding) {
		out.left += mPaddingLeft;
		out.right -= mPaddingRight;
		out.top += mPaddingTop;
		out.bottom -= mPaddingBottom;
		}
		}

		/**
		* Returns whether this group's children are clipped to their bounds before drawing.
		* The default value is true.

core/java/com/android/internal/app/AlertController.java

+18 −56

Original line number	Diff line number	Diff line
		@@ -526,11 +526,15 @@ public class AlertController {
		mWindow.setCloseOnTouchOutsideIfNotSet(true);
		}

		// Only display the divider if we have a title and a custom view or a
		// message.
		if (hasTopPanel) {
		// Only clip scrolling content to padding if we have a title.
		if (mScrollView != null) {
		mScrollView.setClipToPadding(true);
		}

		// Only show the divider if we have a title.
		final View divider;
		if (mMessage != null \|\| hasCustomPanel \|\| mListView != null) {
		if (mMessage != null \|\| mListView != null \|\| hasCustomPanel) {
		divider = topPanel.findViewById(R.id.titleDivider);
		} else {
		divider = topPanel.findViewById(R.id.titleDividerTop);
		@@ -541,6 +545,17 @@ public class AlertController {
		}
		}

		// Update scroll indicators as needed.
		if (!hasCustomPanel) {
		final View content = mListView != null ? mListView : mScrollView;
		if (content != null) {
		final int indicators = (hasTopPanel ? View.SCROLL_INDICATOR_TOP : 0)
		\| (hasButtonPanel ? View.SCROLL_INDICATOR_BOTTOM : 0);
		content.setScrollIndicators(indicators,
		View.SCROLL_INDICATOR_TOP \| View.SCROLL_INDICATOR_BOTTOM);
		}
		}

		final TypedArray a = mContext.obtainStyledAttributes(
		null, R.styleable.AlertDialog, R.attr.alertDialogStyle, 0);
		setBackground(a, topPanel, contentPanel, customPanel, buttonPanel,
		@@ -654,59 +669,6 @@ public class AlertController {
		contentPanel.setVisibility(View.GONE);
		}
		}

		// Set up scroll indicators (if present).
		final View indicatorUp = contentPanel.findViewById(R.id.scrollIndicatorUp);
		final View indicatorDown = contentPanel.findViewById(R.id.scrollIndicatorDown);
		if (indicatorUp != null \|\| indicatorDown != null) {
		if (mMessage != null) {
		// We're just showing the ScrollView, set up listener.
		mScrollView.setOnScrollChangeListener(new View.OnScrollChangeListener() {
		@Override
		public void onScrollChange(View v, int scrollX, int scrollY,
		int oldScrollX, int oldScrollY) {
		manageScrollIndicators(v, indicatorUp, indicatorDown);
		}
		});
		// Set up the indicators following layout.
		mScrollView.post(new Runnable() {
		@Override
		public void run() {
		manageScrollIndicators(mScrollView, indicatorUp, indicatorDown);
		}
		});

		} else if (mListView != null) {
		// We're just showing the AbsListView, set up listener.
		mListView.setOnScrollListener(new AbsListView.OnScrollListener() {
		@Override
		public void onScrollStateChanged(AbsListView view, int scrollState) {
		// That's cool, I guess?
		}

		@Override
		public void onScroll(AbsListView v, int firstVisibleItem,
		int visibleItemCount, int totalItemCount) {
		manageScrollIndicators(v, indicatorUp, indicatorDown);
		}
		});
		// Set up the indicators following layout.
		mListView.post(new Runnable() {
		@Override
		public void run() {
		manageScrollIndicators(mListView, indicatorUp, indicatorDown);
		}
		});
		} else {
		// We don't have any content to scroll, remove the indicators.
		if (indicatorUp != null) {
		contentPanel.removeView(indicatorUp);
		}
		if (indicatorDown != null) {
		contentPanel.removeView(indicatorDown);
		}
		}
		}
		}

		private static void manageScrollIndicators(View v, View upIndicator, View downIndicator) {