OA系统五彩种蓝色版现jin模式稳定无错运营中版本Android中实现上下左右都可滑动的Scrol

OA系统五彩种蓝色版现jin模式稳定无错下载地址 QQ 2952777280
import java.util.List;

import android.widget.FrameLayout;
import android.content.Context;
import android.graphics.Rect;
import android.os.Handler;
import android.util.AttributeSet;
import android.view.FocusFinder;
import android.view.KeyEvent;
import android.view.MotionEvent;
import android.view.VelocityTracker;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.view.animation.AnimationUtils;
import android.view.animation.TranslateAnimation;
import android.widget.FrameLayout;
import android.widget.Scroller;

/**

类功能描述：
具有弹性效果的全方向ScrollView,参考ScrollView与HorizontalScrollView源码
*/
public class HVScrollView extends FrameLayout {
static final int ANIMATED_SCROLL_GAP = 250;

static final float MAX_SCROLL_FACTOR = 0.5f;

private long mLastScroll;

private final Rect mTempRect = new Rect();
private Scroller mScroller;

/**
- Flag to indicate that we are moving focus ourselves. This is so the
- code that watches for focus changes initiated outside this ScrollView
- knows that it does not have to do anything.
 */
 private boolean mScrollViewMovedFocus;
/**
- Position of the last motion event.
 */
 private float mLastMotionY;
 private float mLastMotionX;
/**
- True when the layout has changed but the traversal has not come through yet.
- Ideally the view hierarchy would keep track of this for us.
 */
 private boolean mIsLayoutDirty = true;
/**
- The child to give focus to in the event that a child has requested focus while the
- layout is dirty. This prevents the scroll from being wrong if the child has not been
- laid out before requesting focus.
 */
 private View mChildToScrollTo = null;
/**
- True if the user is currently dragging this ScrollView around. This is
- not the same as 'is being flinged', which can be checked by
- mScroller.isFinished() (flinging begins when the user lifts his finger).
 */
 private boolean mIsBeingDragged = false;
/**
- Determines speed during touch scrolling
 */
 private VelocityTracker mVelocityTracker;
/**
- When set to true, the scroll view measure its child to make it fill the currently
- visible area.
 */
 private boolean mFillViewport;
/**
- Whether arrow scrolling is animated.
 */
 private boolean mSmoothScrollingEnabled = true;
private int mTouchSlop;
private int mMinimumVelocity;
private int mMaximumVelocity;

/**
- ID of the active pointer. This is used to retain consistency during
- drags/flings if multiple pointers are used.
 */
 private int mActivePointerId = INVALID_POINTER;
/**
- Sentinel value for no current active pointer.
- Used by {@link #mActivePointerId}.
 */
 private static final int INVALID_POINTER = -1;
private boolean mFlingEnabled = true;

public HVScrollView(Context context) {
this(context, null);
}

public HVScrollView(Context context, AttributeSet attrs) {
super(context, attrs);
initScrollView();
}

@Override
protected float getTopFadingEdgeStrength() {
if (getChildCount() == 0) {
return 0.0f;
}
```
final int length = getVerticalFadingEdgeLength(); 
if (getScrollY() < length) { 
 return getScrollY() / (float)length; 
} 

return 1.0f; 
```
}

@Override
protected float getLeftFadingEdgeStrength() {
if (getChildCount() == 0) {
return 0.0f;
}
```
final int length = getHorizontalFadingEdgeLength(); 
if (getScrollX() < length) { 
 return getScrollX() / (float)length; 
} 

return 1.0f; 
```
}

@Override
protected float getRightFadingEdgeStrength() {
if (getChildCount() == 0) {
return 0.0f;
}
```
final int length = getHorizontalFadingEdgeLength(); 
final int rightEdge = getWidth() - getPaddingRight(); 
final int span = getChildAt(0).getRight() - getScrollX() - rightEdge; 
if (span < length) { 
 return span / (float)length; 
} 

return 1.0f; 
```
}

@Override
protected float getBottomFadingEdgeStrength() {
if (getChildCount() == 0) {
return 0.0f;
}
```
final int length = getVerticalFadingEdgeLength(); 
final int bottomEdge = getHeight() - getPaddingBottom(); 
final int span = getChildAt(0).getBottom() - getScrollY() - bottomEdge; 
if (span < length) { 
 return span / (float)length; 
} 

return 1.0f; 
```
}

/**
- @return The maximum amount this scroll view will scroll in response to
- an arrow event.
 /
 public int getMaxScrollAmountV() {
 return (int)(MAX_SCROLL_FACTOR (getBottom() - getTop()));
 }
public int getMaxScrollAmountH() {
return (int)(MAX_SCROLL_FACTOR * (getRight() - getLeft()));
}

private void initScrollView() {
mScroller = new Scroller(getContext());
setFocusable(true);
setDescendantFocusability(FOCUS_AFTER_DESCENDANTS);
setWillNotDraw(false);
final ViewConfiguration configuration = ViewConfiguration.get(getContext());
mTouchSlop = configuration.getScaledTouchSlop();
mMinimumVelocity = configuration.getScaledMinimumFlingVelocity();
mMaximumVelocity = configuration.getScaledMaximumFlingVelocity();
}

@Override
public void addView(View child) {
if (getChildCount() > 0) {
throw new IllegalStateException("ScrollView can host only one direct child");
}
```
super.addView(child); 
```
}

@Override
public void addView(View child, int index) {
if (getChildCount() > 0) {
throw new IllegalStateException("ScrollView can host only one direct child");
}
```
super.addView(child, index); 
```
}

@Override
public void addView(View child, ViewGroup.LayoutParams params) {
if (getChildCount() > 0) {
throw new IllegalStateException("ScrollView can host only one direct child");
}
```
super.addView(child, params); 
```
}

@Override
public void addView(View child, int index, ViewGroup.LayoutParams params) {
if (getChildCount() > 0) {
throw new IllegalStateException("ScrollView can host only one direct child");
}
```
super.addView(child, index, params); 
```
}

/**
- @return Returns true this ScrollView can be scrolled
 */
 private boolean canScrollV() {
 View child = getChildAt(0);
 if (child != null) {
 int childHeight = child.getHeight();
 return getHeight() < childHeight + getPaddingTop() + getPaddingBottom();
 }
 return false;
 }
private boolean canScrollH() {
View child = getChildAt(0);
if (child != null) {
int childWidth = child.getWidth();
return getWidth() < childWidth + getPaddingLeft() + getPaddingRight();
}
return false;
}

/**
- Indicates whether this ScrollView's content is stretched to fill the viewport.
- @return True if the content fills the viewport, false otherwise.
 */
 public boolean isFillViewport() {
 return mFillViewport;
 }
/**
- Indicates this ScrollView whether it should stretch its content height to fill
- the viewport or not.
- @param fillViewport True to stretch the content's height to the viewport's
- boundaries, false otherwise.
 */
 public void setFillViewport(boolean fillViewport) {
 if (fillViewport != mFillViewport) {
 mFillViewport = fillViewport;
 requestLayout();
 }
 }
/**
- @return Whether arrow scrolling will animate its transition.
 */
 public boolean isSmoothScrollingEnabled() {
 return mSmoothScrollingEnabled;
 }
/**
- Set whether arrow scrolling will animate its transition.
- @param smoothScrollingEnabled whether arrow scrolling will animate its transition
 */
 public void setSmoothScrollingEnabled(boolean smoothScrollingEnabled) {
 mSmoothScrollingEnabled = smoothScrollingEnabled;
 }
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
```
if (!mFillViewport) { 
 return; 
} 

final int heightMode = MeasureSpec.getMode(heightMeasureSpec); 
final int widthMode = MeasureSpec.getMode(widthMeasureSpec); 
if (heightMode == MeasureSpec.UNSPECIFIED && widthMode == MeasureSpec.UNSPECIFIED) { 
 return; 
} 

if (getChildCount() > 0) { 
 final View child = getChildAt(0); 
 int height = getMeasuredHeight(); 
 int width = getMeasuredWidth(); 
 if (child.getMeasuredHeight() < height || child.getMeasuredWidth() < width) { 
 width -= getPaddingLeft(); 
 width -= getPaddingRight(); 
 int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(width, MeasureSpec.EXACTLY); 

 height -= getPaddingTop(); 
 height -= getPaddingBottom(); 
 int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(height, 
 MeasureSpec.EXACTLY); 

 child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 
 } 
} 
```
}

@Override
public boolean dispatchKeyEvent(KeyEvent event) {
// Let the focused view and/or our descendants get the key first
return super.dispatchKeyEvent(event) || executeKeyEvent(event);
}

/**
- You can call this function yourself to have the scroll view perform
- scrolling from a key event, just as if the event had been dispatched to
- it by the view hierarchy.
- @param event The key event to execute.
- @return Return true if the event was handled, else false.
 */
 public boolean executeKeyEvent(KeyEvent event) {
 mTempRect.setEmpty();
 
 boolean handled = false;
 
 if (event.getAction() == KeyEvent.ACTION_DOWN) {
 switch (event.getKeyCode()) {
 case KeyEvent.KEYCODE_DPAD_LEFT:
 if (canScrollH()) {
 if (!event.isAltPressed()) {
 handled = arrowScrollH(View.FOCUS_LEFT);
 } else {
 handled = fullScrollH(View.FOCUS_LEFT);
 }
 }
 break;
 case KeyEvent.KEYCODE_DPAD_RIGHT:
 if (canScrollH()) {
 if (!event.isAltPressed()) {
 handled = arrowScrollH(View.FOCUS_RIGHT);
 } else {
 handled = fullScrollH(View.FOCUS_RIGHT);
 }
 }
 break;
 case KeyEvent.KEYCODE_DPAD_UP:
 if (canScrollV()) {
 if (!event.isAltPressed()) {
 handled = arrowScrollV(View.FOCUS_UP);
 } else {
 handled = fullScrollV(View.FOCUS_UP);
 }
 }
 break;
 case KeyEvent.KEYCODE_DPAD_DOWN:
 if (canScrollV()) {
 if (!event.isAltPressed()) {
 handled = arrowScrollV(View.FOCUS_DOWN);
 } else {
 handled = fullScrollV(View.FOCUS_DOWN);
 }
 }
 break;
 }
 }
 return handled;
 }
private boolean inChild(int x, int y) {
if (getChildCount() > 0) {
final int scrollX = getScrollX();
final int scrollY = getScrollY();
final View child = getChildAt(0);
return !(y < child.getTop() - scrollY || y >= child.getBottom() - scrollY
|| x < child.getLeft() - scrollX || x >= child.getRight() - scrollX);
}
return false;
}

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
/*
- This method JUST determines whether we want to intercept the motion.
- If we return true, onMotionEvent will be called and we do the actual
- scrolling there.
 */
 
 /*
- Shortcut the most recurring case: the user is in the dragging state
- and he is moving his finger. We want to intercept this motion.
 */
 final int action = ev.getAction();
 if ((action == MotionEvent.ACTION_MOVE) && (mIsBeingDragged)) {
 return true;
 }
 
 switch (action & MotionEvent.ACTION_MASK) {
 case MotionEvent.ACTION_MOVE: {
 /*
 - mIsBeingDragged == false, otherwise the shortcut would have
 - caught it. Check whether the user has moved far enough from
 - his original down touch.
 */
```
/* 
```
 - Locally do absolute value. mLastMotionY is set to the y value
 - of the down event.
 */
 final int activePointerId = mActivePointerId;
 if (activePointerId == INVALID_POINTER) {
 // If we don't have a valid id, the touch down wasn't on
 // content.
 break;
 }
```
final int pointerIndex = ev.findPointerIndex(activePointerId); 
final float y = ev.getY(pointerIndex); 
final int yDiff = (int)Math.abs(y - mLastMotionY); 
if (yDiff > mTouchSlop) { 
 mIsBeingDragged = true; 
 mLastMotionY = y; 
} 
final float x = ev.getX(pointerIndex); 
final int xDiff = (int)Math.abs(x - mLastMotionX); 
if (xDiff > mTouchSlop) { 
 mIsBeingDragged = true; 
 mLastMotionX = x; 
} 
break; 
```
 }
 
 case MotionEvent.ACTION_DOWN: {
 final float x = ev.getX();
 final float y = ev.getY();
 if (!inChild((int)x, (int)y)) {
 mIsBeingDragged = false;
 break;
 }
```
/* 
```
 - Remember location of down touch. ACTION_DOWN always refers to
 - pointer index 0.
 */
 mLastMotionY = y;
 mLastMotionX = x;
 mActivePointerId = ev.getPointerId(0);
```
/* 
```
 - If being flinged and user touches the screen, initiate drag;
 - otherwise don't. mScroller.isFinished should be false when
 - being flinged.
 */
 mIsBeingDragged = !mScroller.isFinished();
 break;
 }
 
 case MotionEvent.ACTION_CANCEL:
 case MotionEvent.ACTION_UP:
 / Release the drag /
 mIsBeingDragged = false;
 mActivePointerId = INVALID_POINTER;
 break;
 case MotionEvent.ACTION_POINTER_UP:
 onSecondaryPointerUp(ev);
 break;
 }
 /*
- The only time we want to intercept motion events is if we are in the
- drag mode.
 */
 return mIsBeingDragged;
 }
private boolean scrollableOutsideTouch = false;

/**
- 设置scroller是否可以滑动内容当触屏事件在chileview之外 default:false
- @param b true-可以,false-不可
 */
 public void setScrollableOutsideChile(boolean b) {
 scrollableOutsideTouch = b;
 }
private boolean flexible = true;

/**
- 设置是否可有弹性效果
- @param b true-可以,false-不可
 */
 public void setFlexible(boolean b) {
 flexible = b;
 }
private long lastEvenTime;

@Override
public boolean onTouchEvent(MotionEvent ev) {
```
if (ev.getAction() == MotionEvent.ACTION_DOWN && ev.getEdgeFlags() != 0) { 
 // Don't handle edge touches immediately -- they may actually belong 
 // to one of our 
 // descendants. 
 return false; 
} 

if (mVelocityTracker == null) { 
 mVelocityTracker = VelocityTracker.obtain(); 
} 
mVelocityTracker.addMovement(ev); 

final int action = ev.getAction(); 

switch (action & MotionEvent.ACTION_MASK) { 
 case MotionEvent.ACTION_DOWN: { 
 final float x = ev.getX(); 
 final float y = ev.getY(); 
 if (!(mIsBeingDragged = inChild((int)x, (int)y)) && !scrollableOutsideTouch) { 
 return false; 
 } 
 // 阻止测试人员暴力测试 
 if (System.currentTimeMillis() - lastEvenTime < 200) { 
 ev.setAction(MotionEvent.ACTION_CANCEL); 
 } 
 lastEvenTime = System.currentTimeMillis(); 
 /* 
 * If being flinged and user touches, stop the fling. isFinished 
 * will be false if being flinged. 
 */ 
 if (!mScroller.isFinished()) { 
 mScroller.abortAnimation(); 
 } 

 // Remember where the motion event started 
 mLastMotionY = y; 
 mLastMotionX = x; 
 mActivePointerId = ev.getPointerId(0); 
 break; 
 } 
 case MotionEvent.ACTION_MOVE: 
 if (mIsBeingDragged || scrollableOutsideTouch) { 
 // Scroll to follow the motion event 
 final int activePointerIndex = ev.findPointerIndex(mActivePointerId); 
 final float y = ev.getY(activePointerIndex); 
 final int deltaY = (int)(mLastMotionY - y); 
 mLastMotionY = y; 

 final float x = ev.getX(activePointerIndex); 
 final int deltaX = (int)(mLastMotionX - x); 
 mLastMotionX = x; 
 // 全方向滚动 
 scrollBy(deltaX, deltaY); 
 // 当滚动到边界时就不会再滚动，这时移动布局 
 if (isNeedMove() && flexible) { 
 if (normal.isEmpty()) { 
 // 保存正常的布局属性 
 normal.set(inner.getLeft(), inner.getTop(), inner.getRight(), 
 inner.getBottom()); 
 } 
 // 移动布局 
 inner.layout(inner.getLeft() - deltaX / 2, inner.getTop() - deltaY / 2, 
 inner.getRight() - deltaX / 2, inner.getBottom() - deltaY / 2); 
 } 
 } 
 break; 
 case MotionEvent.ACTION_UP: 
 if (mIsBeingDragged || scrollableOutsideTouch) { 
 if (mFlingEnabled) { 
 final VelocityTracker velocityTracker = mVelocityTracker; 
 velocityTracker.computeCurrentVelocity(1000, mMaximumVelocity); 
 int initialVelocitx = (int)velocityTracker.getXVelocity(mActivePointerId); 
 int initialVelocity = (int)velocityTracker.getYVelocity(mActivePointerId); 

 if (getChildCount() > 0) { 
 if (Math.abs(initialVelocitx) > initialVelocitx 
 || Math.abs(initialVelocity) > mMinimumVelocity) { 
 fling(-initialVelocitx, -initialVelocity); 
 } 

 } 
 } 
 if (isNeedAnimation()) { 
 animation(); 
 } 
 mActivePointerId = INVALID_POINTER; 
 mIsBeingDragged = false; 

 if (mVelocityTracker != null) { 
 mVelocityTracker.recycle(); 
 mVelocityTracker = null; 
 } 
 } 
 break; 
 case MotionEvent.ACTION_CANCEL: 
 if (mIsBeingDragged && getChildCount() > 0) { 
 mActivePointerId = INVALID_POINTER; 
 mIsBeingDragged = false; 
 if (mVelocityTracker != null) { 
 mVelocityTracker.recycle(); 
 mVelocityTracker = null; 
 } 
 } 
 break; 
 case MotionEvent.ACTION_POINTER_UP: 
 onSecondaryPointerUp(ev); 
 break; 
} 
return true; 
```
}

private void onSecondaryPointerUp(MotionEvent ev) {
final int pointerIndex = (ev.getAction() & MotionEvent.ACTION_POINTER_INDEX_MASK) >> MotionEvent.ACTION_POINTER_INDEX_SHIFT;
final int pointerId = ev.getPointerId(pointerIndex);
if (pointerId == mActivePointerId) {
// This was our active pointer going up. Choose a new
// active pointer and adjust accordingly.
final int newPointerIndex = pointerIndex == 0 ? 1 : 0;
mLastMotionX = ev.getX(newPointerIndex);
mLastMotionY = ev.getY(newPointerIndex);
mActivePointerId = ev.getPointerId(newPointerIndex);
if (mVelocityTracker != null) {
mVelocityTracker.clear();
}
}
}

/**
- 
- Finds the next focusable component that fits in the specified bounds.
- 
- @param topFocus look for a candidate is the one at the top of the bounds
- if topFocus is true, or at the bottom of the bounds if topFocus is
- false
- @param top the top offset of the bounds in which a focusable must be
- found
- @param bottom the bottom offset of the bounds in which a focusable must
- be found
- @return the next focusable component in the bounds or null if none can
- be found
 */
 private View findFocusableViewInBoundsV(boolean topFocus, int top, int bottom) {
 
 List<View> focusables = getFocusables(View.FOCUS_FORWARD);
 View focusCandidate = null;
 
 /*
 - A fully contained focusable is one where its top is below the bound's
 - top, and its bottom is above the bound's bottom. A partially
 - contained focusable is one where some part of it is within the
 - bounds, but it also has some part that is not within bounds. A fully
 - contained focusable is preferred to a partially contained focusable.
 */
 boolean foundFullyContainedFocusable = false;
 int count = focusables.size();
 for (int i = 0; i < count; i++) {
 View view = focusables.get(i);
 int viewTop = view.getTop();
 int viewBottom = view.getBottom();
```
if (top < viewBottom && viewTop < bottom) { 
 /* 
 * the focusable is in the target area, it is a candidate for 
 * focusing 
 */ 

 final boolean viewIsFullyContained = (top < viewTop) && (viewBottom < bottom); 

 if (focusCandidate == null) { 
 /* No candidate, take this one */ 
 focusCandidate = view; 
 foundFullyContainedFocusable = viewIsFullyContained; 
 } else { 
 final boolean viewIsCloserToBoundary = (topFocus && viewTop < focusCandidate 
 .getTop()) || (!topFocus && viewBottom > focusCandidate.getBottom()); 

 if (foundFullyContainedFocusable) { 
 if (viewIsFullyContained && viewIsCloserToBoundary) { 
 /* 
 * We're dealing with only fully contained views, so 
 * it has to be closer to the boundary to beat our 
 * candidate 
 */ 
 focusCandidate = view; 
 } 
 } else { 
 if (viewIsFullyContained) { 
 /* 
 * Any fully contained view beats a partially 
 * contained view 
 */ 
 focusCandidate = view; 
 foundFullyContainedFocusable = true; 
 } else if (viewIsCloserToBoundary) { 
 /* 
 * Partially contained view beats another partially 
 * contained view if it's closer 
 */ 
 focusCandidate = view; 
 } 
 } 
 } 
} 
```
 }
 
 return focusCandidate;
 }
private View findFocusableViewInBoundsH(boolean leftFocus, int left, int right) {
```
List<View> focusables = getFocusables(View.FOCUS_FORWARD); 
View focusCandidate = null; 

/* 
 * A fully contained focusable is one where its left is below the 
 * bound's left, and its right is above the bound's right. A partially 
 * contained focusable is one where some part of it is within the 
 * bounds, but it also has some part that is not within bounds. A fully 
 * contained focusable is preferred to a partially contained focusable. 
 */ 
boolean foundFullyContainedFocusable = false; 

int count = focusables.size(); 
for (int i = 0; i < count; i++) { 
 View view = focusables.get(i); 
 int viewLeft = view.getLeft(); 
 int viewRight = view.getRight(); 

 if (left < viewRight && viewLeft < right) { 
 /* 
 * the focusable is in the target area, it is a candidate for 
 * focusing 
 */ 

 final boolean viewIsFullyContained = (left < viewLeft) && (viewRight < right); 

 if (focusCandidate == null) { 
 /* No candidate, take this one */ 
 focusCandidate = view; 
 foundFullyContainedFocusable = viewIsFullyContained; 
 } else { 
 final boolean viewIsCloserToBoundary = (leftFocus && viewLeft < focusCandidate 
 .getLeft()) || (!leftFocus && viewRight > focusCandidate.getRight()); 

 if (foundFullyContainedFocusable) { 
 if (viewIsFullyContained && viewIsCloserToBoundary) { 
 /* 
 * We're dealing with only fully contained views, so 
 * it has to be closer to the boundary to beat our 
 * candidate 
 */ 
 focusCandidate = view; 
 } 
 } else { 
 if (viewIsFullyContained) { 
 /* 
 * Any fully contained view beats a partially 
 * contained view 
 */ 
 focusCandidate = view; 
 foundFullyContainedFocusable = true; 
 } else if (viewIsCloserToBoundary) { 
 /* 
 * Partially contained view beats another partially 
 * contained view if it's closer 
 */ 
 focusCandidate = view; 
 } 
 } 
 } 
 } 
} 

return focusCandidate; 
```
}

/**
- Handles scrolling in response to a "home/end" shortcut press. This
- method will scroll the view to the top or bottom and give the focus
- to the topmost/bottommost component in the new visible area. If no
- component is a good candidate for focus, this scrollview reclaims the
- focus.
- @param direction the scroll direction: {@link android.view.View#FOCUS_UP}
- to go the top of the view or
- {@link android.view.View#FOCUS_DOWN} to go the bottom
- @return true if the key event is consumed by this method, false otherwise
 */
 public boolean fullScrollV(int direction) {
 boolean down = direction == View.FOCUS_DOWN;
 int height = getHeight();
 
 mTempRect.top = 0;
 mTempRect.bottom = height;
 
 if (down) {
 int count = getChildCount();
 if (count > 0) {
 View view = getChildAt(count - 1);
 mTempRect.bottom = view.getBottom();
 mTempRect.top = mTempRect.bottom - height;
 }
 }
 
 return scrollAndFocusV(direction, mTempRect.top, mTempRect.bottom);
 }
public boolean fullScrollH(int direction) {
boolean right = direction == View.FOCUS_RIGHT;
int width = getWidth();
```
mTempRect.left = 0; 
mTempRect.right = width; 

if (right) { 
 int count = getChildCount(); 
 if (count > 0) { 
 View view = getChildAt(0); 
 mTempRect.right = view.getRight(); 
 mTempRect.left = mTempRect.right - width; 
 } 
} 

return scrollAndFocusH(direction, mTempRect.left, mTempRect.right); 
```
}

/**
- Scrolls the view to make the area defined by <code>top</code> and
- <code>bottom</code> visible. This method attempts to give the focus
- to a component visible in this area. If no component can be focused in
- the new visible area, the focus is reclaimed by this scrollview.
- @param direction the scroll direction: {@link android.view.View#FOCUS_UP}
- to go upward
- {@link android.view.View#FOCUS_DOWN} to downward
- @param top the top offset of the new area to be made visible
- @param bottom the bottom offset of the new area to be made visible
- @return true if the key event is consumed by this method, false otherwise
 */
 private boolean scrollAndFocusV(int direction, int top, int bottom) {
 boolean handled = true;
 
 int height = getHeight();
 int containerTop = getScrollY();
 int containerBottom = containerTop + height;
 boolean up = direction == View.FOCUS_UP;
 
 View newFocused = findFocusableViewInBoundsV(up, top, bottom);
 if (newFocused == null) {
 newFocused = this;
 }
 
 if (top >= containerTop && bottom <= containerBottom) {
 handled = false;
 } else {
 int delta = up ? (top - containerTop) : (bottom - containerBottom);
 doScrollY(delta);
 }
 
 if (newFocused != findFocus() && newFocused.requestFocus(direction)) {
 mScrollViewMovedFocus = true;
 mScrollViewMovedFocus = false;
 }
 
 return handled;
 }
private boolean scrollAndFocusH(int direction, int left, int right) {
boolean handled = true;
```
int width = getWidth(); 
int containerLeft = getScrollX(); 
int containerRight = containerLeft + width; 
boolean goLeft = direction == View.FOCUS_LEFT; 

View newFocused = findFocusableViewInBoundsH(goLeft, left, right); 
if (newFocused == null) { 
 newFocused = this; 
} 

if (left >= containerLeft && right <= containerRight) { 
 handled = false; 
} else { 
 int delta = goLeft ? (left - containerLeft) : (right - containerRight); 
 doScrollX(delta); 
} 

if (newFocused != findFocus() && newFocused.requestFocus(direction)) { 
 mScrollViewMovedFocus = true; 
 mScrollViewMovedFocus = false; 
} 

return handled; 
```
}

/**
- Handle scrolling in response to an up or down arrow click.
- @param direction The direction corresponding to the arrow key that was
- pressed
- @return True if we consumed the event, false otherwise
 */
 public boolean arrowScrollV(int direction) {
 
 View currentFocused = findFocus();
 if (currentFocused == this)
 currentFocused = null;
 
 View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction);
 
 final int maxJump = getMaxScrollAmountV();
 
 if (nextFocused != null && isWithinDeltaOfScreenV(nextFocused, maxJump, getHeight())) {
 nextFocused.getDrawingRect(mTempRect);
 offsetDescendantRectToMyCoords(nextFocused, mTempRect);
 int scrollDelta = computeScrollDeltaToGetChildRectOnScreenV(mTempRect);
 doScrollY(scrollDelta);
 nextFocused.requestFocus(direction);
 } else {
 // no new focus
 int scrollDelta = maxJump;
```
if (direction == View.FOCUS_UP && getScrollY() < scrollDelta) { 
 scrollDelta = getScrollY(); 
} else if (direction == View.FOCUS_DOWN) { 
 if (getChildCount() > 0) { 
 int daBottom = getChildAt(0).getBottom(); 

 int screenBottom = getScrollY() + getHeight(); 

 if (daBottom - screenBottom < maxJump) { 
 scrollDelta = daBottom - screenBottom; 
 } 
 } 
} 
if (scrollDelta == 0) { 
 return false; 
} 
doScrollY(direction == View.FOCUS_DOWN ? scrollDelta : -scrollDelta); 
```
 }
 
 if (currentFocused != null && currentFocused.isFocused() && isOffScreenV(currentFocused)) {
 // previously focused item still has focus and is off screen, give
 // it up (take it back to ourselves)
 // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we
 // are sure to get it)
 final int descendantFocusability = getDescendantFocusability(); // save
 setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS);
 requestFocus();
 setDescendantFocusability(descendantFocusability); // restore
 }
 return true;
 }
public boolean arrowScrollH(int direction) {
```
View currentFocused = findFocus(); 
if (currentFocused == this) 
 currentFocused = null; 

View nextFocused = FocusFinder.getInstance().findNextFocus(this, currentFocused, direction); 

final int maxJump = getMaxScrollAmountH(); 

if (nextFocused != null && isWithinDeltaOfScreenH(nextFocused, maxJump)) { 
 nextFocused.getDrawingRect(mTempRect); 
 offsetDescendantRectToMyCoords(nextFocused, mTempRect); 
 int scrollDelta = computeScrollDeltaToGetChildRectOnScreenH(mTempRect); 
 doScrollX(scrollDelta); 
 nextFocused.requestFocus(direction); 
} else { 
 // no new focus 
 int scrollDelta = maxJump; 

 if (direction == View.FOCUS_LEFT && getScrollX() < scrollDelta) { 
 scrollDelta = getScrollX(); 
 } else if (direction == View.FOCUS_RIGHT && getChildCount() > 0) { 

 int daRight = getChildAt(0).getRight(); 

 int screenRight = getScrollX() + getWidth(); 

 if (daRight - screenRight < maxJump) { 
 scrollDelta = daRight - screenRight; 
 } 
 } 
 if (scrollDelta == 0) { 
 return false; 
 } 
 doScrollX(direction == View.FOCUS_RIGHT ? scrollDelta : -scrollDelta); 
} 

if (currentFocused != null && currentFocused.isFocused() && isOffScreenH(currentFocused)) { 
 // previously focused item still has focus and is off screen, give 
 // it up (take it back to ourselves) 
 // (also, need to temporarily force FOCUS_BEFORE_DESCENDANTS so we 
 // are sure to get it) 
 final int descendantFocusability = getDescendantFocusability(); // save 
 setDescendantFocusability(ViewGroup.FOCUS_BEFORE_DESCENDANTS); 
 requestFocus(); 
 setDescendantFocusability(descendantFocusability); // restore 
} 
return true; 
```
}

/**
- @return whether the descendant of this scroll view is scrolled off
- screen.
 */
 private boolean isOffScreenV(View descendant) {
 return !isWithinDeltaOfScreenV(descendant, 0, getHeight());
 }
private boolean isOffScreenH(View descendant) {
return !isWithinDeltaOfScreenH(descendant, 0);
}

/**
- @return whether the descendant of this scroll view is within delta
- pixels of being on the screen.
 */
 private boolean isWithinDeltaOfScreenV(View descendant, int delta, int height) {
 descendant.getDrawingRect(mTempRect);
 offsetDescendantRectToMyCoords(descendant, mTempRect);
 
 return (mTempRect.bottom + delta) >= getScrollY()
 && (mTempRect.top - delta) <= (getScrollY() + height);
 }
private boolean isWithinDeltaOfScreenH(View descendant, int delta) {
descendant.getDrawingRect(mTempRect);
offsetDescendantRectToMyCoords(descendant, mTempRect);
```
return (mTempRect.right + delta) >= getScrollX() 
 && (mTempRect.left - delta) <= (getScrollX() + getWidth()); 
```
}

/**
- Smooth scroll by a Y delta
- @param delta the number of pixels to scroll by on the Y axis
 */
 private void doScrollY(int delta) {
 if (delta != 0) {
 if (mSmoothScrollingEnabled) {
 smoothScrollBy(0, delta);
 } else {
 scrollBy(0, delta);
 }
 }
 }
private void doScrollX(int delta) {
if (delta != 0) {
if (mSmoothScrollingEnabled) {
smoothScrollBy(delta, 0);
} else {
scrollBy(delta, 0);
}
}
}

/**
- Like {@link View#scrollBy}, but scroll smoothly instead of immediately.
- @param dx the number of pixels to scroll by on the X axis
- @param dy the number of pixels to scroll by on the Y axis
 */
 public void smoothScrollBy(int dx, int dy) {
 if (getChildCount() == 0) {
 // Nothing to do.
 return;
 }
 long duration = AnimationUtils.currentAnimationTimeMillis() - mLastScroll;
 if (duration > ANIMATED_SCROLL_GAP) {
 final int height = getHeight() - getPaddingBottom() - getPaddingTop();
 final int bottom = getChildAt(0).getHeight();
 final int maxY = Math.max(0, bottom - height);
 final int scrollY = getScrollY();
 dy = Math.max(0, Math.min(scrollY + dy, maxY)) - scrollY;
```
final int width = getWidth() - getPaddingRight() - getPaddingLeft(); 
final int right = getChildAt(0).getWidth(); 
final int maxX = Math.max(0, right - width); 
final int scrollX = getScrollX(); 
dx = Math.max(0, Math.min(scrollX + dx, maxX)) - scrollX; 

mScroller.startScroll(scrollX, scrollY, dx, dy); 
invalidate(); 
```
 } else {
 if (!mScroller.isFinished()) {
 mScroller.abortAnimation();
 }
 scrollBy(dx, dy);
 }
 mLastScroll = AnimationUtils.currentAnimationTimeMillis();
 }
/**
- Like {@link #scrollTo}, but scroll smoothly instead of immediately.
- @param x the position where to scroll on the X axis
- @param y the position where to scroll on the Y axis
 */
 public final void smoothScrollTo(int x, int y) {
 smoothScrollBy(x - getScrollX(), y - getScrollY());
 }
/**
- The scroll range of a scroll view is the overall height of all of its
- children.
 */
 @Override
 protected int computeVerticalScrollRange() {
 final int count = getChildCount();
 final int contentHeight = getHeight() - getPaddingBottom() - getPaddingTop();
 if (count == 0) {
 return contentHeight;
 }
 
 return getChildAt(0).getBottom();
 }
@Override
protected int computeHorizontalScrollRange() {
final int count = getChildCount();
final int contentWidth = getWidth() - getPaddingLeft() - getPaddingRight();
if (count == 0) {
return contentWidth;
}
```
return getChildAt(0).getRight(); 
```
}

@Override
protected int computeVerticalScrollOffset() {
return Math.max(0, super.computeVerticalScrollOffset());
}

@Override
protected int computeHorizontalScrollOffset() {
return Math.max(0, super.computeHorizontalScrollOffset());
}

@Override
protected void measureChild(View child, int parentWidthMeasureSpec, int parentHeightMeasureSpec) {
int childWidthMeasureSpec;
int childHeightMeasureSpec;
```
childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 

childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(0, MeasureSpec.UNSPECIFIED); 

child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 
```
}

@Override
protected void measureChildWithMargins(View child, int parentWidthMeasureSpec, int widthUsed,
int parentHeightMeasureSpec, int heightUsed) {
final MarginLayoutParams lp = (MarginLayoutParams)child.getLayoutParams();
```
final int childWidthMeasureSpec = MeasureSpec.makeMeasureSpec(lp.leftMargin 
 + lp.rightMargin, MeasureSpec.UNSPECIFIED); 
final int childHeightMeasureSpec = MeasureSpec.makeMeasureSpec(lp.topMargin 
 + lp.bottomMargin, MeasureSpec.UNSPECIFIED); 

child.measure(childWidthMeasureSpec, childHeightMeasureSpec); 
```
}

@Override
public void computeScroll() {
if (mScroller.computeScrollOffset()) {
// This is called at drawing time by ViewGroup. We don't want to
// re-show the scrollbars at this point, which scrollTo will do,
// so we replicate most of scrollTo here.
//
// It's a little odd to call onScrollChanged from inside the
// drawing.
//
// It is, except when you remember that computeScroll() is used to
// animate scrolling. So unless we want to defer the
// onScrollChanged()
// until the end of the animated scrolling, we don't really have a
// choice here.
//
// I agree. The alternative, which I think would be worse, is to
// post
// something and tell the subclasses later. This is bad because
// there
// will be a window where mScrollX/Y is different from what the app
// thinks it is.
//
int x = mScroller.getCurrX();
int y = mScroller.getCurrY();
```
 if (getChildCount() > 0) { 
 View child = getChildAt(0); 
 x = clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth()); 
 y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight()); 
 super.scrollTo(x, y); 
 // getHeight()- child.getHeight()=y ->底部 y=0 ->顶端 
 // 惯性强度 mScroller.getDuration() 
 } 
 awakenScrollBars(); 

 // Keep on drawing until the animation has finished. 
 postInvalidate(); 
} 
```
}

/**
- Scrolls the view to the given child.
- @param child the View to scroll to
 */
 private void scrollToChild(View child) {
 child.getDrawingRect(mTempRect);
 
 / Offset from child's local coordinates to ScrollView coordinates /
 offsetDescendantRectToMyCoords(child, mTempRect);
 
 int scrollDeltaV = computeScrollDeltaToGetChildRectOnScreenV(mTempRect);
 int scrollDeltaH = computeScrollDeltaToGetChildRectOnScreenH(mTempRect);
 
 if (scrollDeltaH != 0 || scrollDeltaV != 0) {
 scrollBy(scrollDeltaH, scrollDeltaV);
 }
 }
/**
- If rect is off screen, scroll just enough to get it (or at least the
- first screen size chunk of it) on screen.
- @param rect The rectangle.
- @param immediate True to scroll immediately without animation
- @return true if scrolling was performed
 */
 private boolean scrollToChildRect(Rect rect, boolean immediate) {
 final int deltaV = computeScrollDeltaToGetChildRectOnScreenV(rect);
 final int deltaH = computeScrollDeltaToGetChildRectOnScreenH(rect);
 final boolean scroll = deltaH != 0 || deltaV != 0;
 if (scroll) {
 if (immediate) {
 scrollBy(deltaH, deltaV);
 } else {
 smoothScrollBy(deltaH, deltaV);
 }
 }
 return scroll;
 }
/**
- Compute the amount to scroll in the Y direction in order to get
- a rectangle completely on the screen (or, if taller than the screen,
- at least the first screen size chunk of it).
- @param rect The rect.
- @return The scroll delta.
 */
 protected int computeScrollDeltaToGetChildRectOnScreenV(Rect rect) {
 if (getChildCount() == 0)
 return 0;
 
 int height = getHeight();
 int screenTop = getScrollY();
 int screenBottom = screenTop + height;
 
 int fadingEdge = getVerticalFadingEdgeLength();
 
 // leave room for top fading edge as long as rect isn't at very top
 if (rect.top > 0) {
 screenTop += fadingEdge;
 }
 
 // leave room for bottom fading edge as long as rect isn't at very
 // bottom
 if (rect.bottom < getChildAt(0).getHeight()) {
 screenBottom -= fadingEdge;
 }
 
 int scrollYDelta = 0;
 
 if (rect.bottom > screenBottom && rect.top > screenTop) {
 // need to move down to get it in view: move down just enough so
 // that the entire rectangle is in view (or at least the first
 // screen size chunk).
```
if (rect.height() > height) { 
 // just enough to get screen size chunk on 
 scrollYDelta += (rect.top - screenTop); 
} else { 
 // get entire rect at bottom of screen 
 scrollYDelta += (rect.bottom - screenBottom); 
} 

// make sure we aren't scrolling beyond the end of our content 
int bottom = getChildAt(0).getBottom(); 
int distanceToBottom = bottom - screenBottom; 
scrollYDelta = Math.min(scrollYDelta, distanceToBottom); 
```
 } else if (rect.top < screenTop && rect.bottom < screenBottom) {
 // need to move up to get it in view: move up just enough so that
 // entire rectangle is in view (or at least the first screen
 // size chunk of it).
```
if (rect.height() > height) { 
 // screen size chunk 
 scrollYDelta -= (screenBottom - rect.bottom); 
} else { 
 // entire rect at top 
 scrollYDelta -= (screenTop - rect.top); 
} 

// make sure we aren't scrolling any further than the top our 
// content 
scrollYDelta = Math.max(scrollYDelta, -getScrollY()); 
```
 }
 return scrollYDelta;
 }
protected int computeScrollDeltaToGetChildRectOnScreenH(Rect rect) {
if (getChildCount() == 0)
return 0;
```
int width = getWidth(); 
int screenLeft = getScrollX(); 
int screenRight = screenLeft + width; 

int fadingEdge = getHorizontalFadingEdgeLength(); 

// leave room for left fading edge as long as rect isn't at very left 
if (rect.left > 0) { 
 screenLeft += fadingEdge; 
} 

// leave room for right fading edge as long as rect isn't at very right 
if (rect.right < getChildAt(0).getWidth()) { 
 screenRight -= fadingEdge; 
} 

int scrollXDelta = 0; 

if (rect.right > screenRight && rect.left > screenLeft) { 
 // need to move right to get it in view: move right just enough so 
 // that the entire rectangle is in view (or at least the first 
 // screen size chunk). 

 if (rect.width() > width) { 
 // just enough to get screen size chunk on 
 scrollXDelta += (rect.left - screenLeft); 
 } else { 
 // get entire rect at right of screen 
 scrollXDelta += (rect.right - screenRight); 
 } 

 // make sure we aren't scrolling beyond the end of our content 
 int right = getChildAt(0).getRight(); 
 int distanceToRight = right - screenRight; 
 scrollXDelta = Math.min(scrollXDelta, distanceToRight); 

} else if (rect.left < screenLeft && rect.right < screenRight) { 
 // need to move right to get it in view: move right just enough so 
 // that 
 // entire rectangle is in view (or at least the first screen 
 // size chunk of it). 

 if (rect.width() > width) { 
 // screen size chunk 
 scrollXDelta -= (screenRight - rect.right); 
 } else { 
 // entire rect at left 
 scrollXDelta -= (screenLeft - rect.left); 
 } 

 // make sure we aren't scrolling any further than the left our 
 // content 
 scrollXDelta = Math.max(scrollXDelta, -getScrollX()); 
} 
return scrollXDelta; 
```
}

@Override
public void requestChildFocus(View child, View focused) {
if (!mScrollViewMovedFocus) {
if (!mIsLayoutDirty) {
scrollToChild(focused);
} else {
// The child may not be laid out yet, we can't compute the
// scroll yet
mChildToScrollTo = focused;
}
}
super.requestChildFocus(child, focused);
}

/**
- When looking for focus in children of a scroll view, need to be a little
- more careful not to give focus to something that is scrolled off screen.
- This is more expensive than the default {@link android.view.ViewGroup}
- implementation, otherwise this behavior might have been made the default.
 */
 @Override
 protected boolean onRequestFocusInDescendants(int direction, Rect previouslyFocusedRect) {
 
 // convert from forward / backward notation to up / down / left / right
 // (ugh).
 // if (direction == View.FOCUS_FORWARD) {
 // direction = View.FOCUS_RIGHT;
 // } else if (direction == View.FOCUS_BACKWARD) {
 // direction = View.FOCUS_LEFT;
 // }
 
 final View nextFocus = previouslyFocusedRect == null ? FocusFinder.getInstance()
 .findNextFocus(this, null, direction) : FocusFinder.getInstance()
 .findNextFocusFromRect(this, previouslyFocusedRect, direction);
 
 if (nextFocus == null) {
 return false;
 }
 
 // if (isOffScreenH(nextFocus)) {
 // return false;
 // }
 
 return nextFocus.requestFocus(direction, previouslyFocusedRect);
 }
@Override
public boolean requestChildRectangleOnScreen(View child, Rect rectangle, boolean immediate) {
// offset into coordinate space of this scroll view
rectangle.offset(child.getLeft() - child.getScrollX(), child.getTop() - child.getScrollY());
```
return scrollToChildRect(rectangle, immediate); 
```
}

@Override
public void requestLayout() {
mIsLayoutDirty = true;
super.requestLayout();
}

@Override
protected void onLayout(boolean changed, int l, int t, int r, int b) {
super.onLayout(changed, l, t, r, b);
mIsLayoutDirty = false;
// Give a child focus if it needs it
if (mChildToScrollTo != null && isViewDescendantOf(mChildToScrollTo, this)) {
scrollToChild(mChildToScrollTo);
}
mChildToScrollTo = null;
```
// Calling this with the present values causes it to re-clam them 
scrollTo(getScrollX(), getScrollY()); 
```
}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
super.onSizeChanged(w, h, oldw, oldh);
```
View currentFocused = findFocus(); 
if (null == currentFocused || this == currentFocused) 
 return; 

// If the currently-focused view was visible on the screen when the 
// screen was at the old height, then scroll the screen to make that 
// view visible with the new screen height. 
if (isWithinDeltaOfScreenV(currentFocused, 0, oldh)) { 
 currentFocused.getDrawingRect(mTempRect); 
 offsetDescendantRectToMyCoords(currentFocused, mTempRect); 
 int scrollDelta = computeScrollDeltaToGetChildRectOnScreenV(mTempRect); 
 doScrollY(scrollDelta); 
} 

final int maxJump = getRight() - getLeft(); 
if (isWithinDeltaOfScreenH(currentFocused, maxJump)) { 
 currentFocused.getDrawingRect(mTempRect); 
 offsetDescendantRectToMyCoords(currentFocused, mTempRect); 
 int scrollDelta = computeScrollDeltaToGetChildRectOnScreenH(mTempRect); 
 doScrollX(scrollDelta); 
} 
```
}

/**
- Return true if child is an descendant of parent, (or equal to the parent).
 */
 private boolean isViewDescendantOf(View child, View parent) {
 if (child == parent) {
 return true;
 }
 
 final ViewParent theParent = child.getParent();
 return (theParent instanceof ViewGroup) && isViewDescendantOf((View)theParent, parent);
 }
/**
- Fling the scroll view
- @param velocityY The initial velocity in the Y direction. Positive
- numbers mean that the finger/cursor is moving down the screen,
- which means we want to scroll towards the top.
 */
 public void fling(int velocityX, int velocityY) {
 if (getChildCount() > 0) {
 int width = getWidth() - getPaddingRight() - getPaddingLeft();
 int right = getChildAt(0).getWidth();
```
int height = getHeight() - getPaddingBottom() - getPaddingTop(); 
int bottom = getChildAt(0).getHeight(); 
mScroller.fling(getScrollX(), getScrollY(), velocityX, velocityY, 0, 
 Math.max(0, right - width), 0, Math.max(0, bottom - height)); 
// final boolean movingDown = velocityX > 0 || velocityY > 0; 
// 
// View newFocused = 
// findFocusableViewInMyBoundsV(movingDown, mScroller.getFinalY(), 
// findFocus()); 
// if (newFocused == null) { 
// newFocused = this; 
// } 
// 
// if (newFocused != findFocus() 
// && newFocused.requestFocus(movingDown ? View.FOCUS_DOWN : 
// View.FOCUS_UP)) { 
// mScrollViewMovedFocus = true; 
// mScrollViewMovedFocus = false; 
// } 
invalidate(); 
```
 }
 }
/**
- {@inheritDoc}
- This version also clamps the scrolling to the bounds of our child.
 */
 @Override
 public void scrollTo(int x, int y) {
 // we rely on the fact the View.scrollBy calls scrollTo.
 if (getChildCount() > 0) {
 View child = getChildAt(0);
 x = clamp(x, getWidth() - getPaddingRight() - getPaddingLeft(), child.getWidth());
 y = clamp(y, getHeight() - getPaddingBottom() - getPaddingTop(), child.getHeight());
 if (x != getScrollX() || y != getScrollY()) {
 super.scrollTo(x, y);
 }
 }
 }
private int clamp(int n, int my, int child) {
if (my >= child || n < 0) {
/*
- my >= child is this case: |--------------- me ---------------|
- |------ child ------| or |--------------- me ---------------|
- |------ child ------| or |--------------- me ---------------|
- |------ child ------| n < 0 is this case: |------ me ------|
- |-------- child --------| |-- mScrollX --|
 /
 return 0;
 }
 if ((my + n) > child) {
 /
- this case: |------ me ------| |------ child ------| |-- mScrollX
- --|
 */
 return child - my;
 }
 return n;
 }
public boolean isFlingEnabled() {
return mFlingEnabled;
}

public void setFlingEnabled(boolean flingEnabled) {
this.mFlingEnabled = flingEnabled;
}

/* scrollview内容与属性记录/
private View inner;
private Rect normal = new Rect();

@Override
protected void onFinishInflate() {
if (getChildCount() > 0) {
inner = getChildAt(0);
}
}

// 是否需要开启动画
public boolean isNeedAnimation() {
return !normal.isEmpty();
}

// 开启动画移动
public void animation() {
// 开启移动动画
TranslateAnimation ta = new TranslateAnimation(0, -inner.getLeft(), 0, -inner.getTop());
ta.setDuration(200);
inner.startAnimation(ta);
// 设置回到正常的布局位置
new Handler().postDelayed(new Runnable() {
public void run() {
inner.clearAnimation();
inner.layout(normal.left, normal.top, normal.right, normal.bottom);
normal.setEmpty();
}
}, 200);

}

// 是否需要移动布局
public boolean isNeedMove() {
int offsetX = inner.getMeasuredWidth() - getWidth();
int scrollX = getScrollX();
if (scrollX == 0 || scrollX == offsetX) {
return true;
}
```
int offsetY = inner.getMeasuredHeight() - getHeight(); 
int scrollY = getScrollY(); 
if (scrollY == 0 || scrollY == offsetY) { 
 return true; 
} 
return false; 
```
}
}

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