Android：Scroller动画？
我是Android开发的新手，我只想了解一下Scroller小部件（android.widget.Scroller）。它如何为视图制作动画？可以访问动画对象（如果存在）吗？如果是这样，怎么样？我已经阅读了源代码，但没有找到线索，或者我可能太新了？
我只是想在Scroller完成滚动之后做一些操作，比如说
m_scroller.getAnimation().setAnimationListener(...);
没有找到相关结果
已邀请:
4 个回复
揽芳僵迷仇
private class Flinger implements Runnable { private final Scroller scroller; private int lastX = 0; Flinger() { scroller = new Scroller(getActivity()); } void start(int initialVelocity) { int initialX = scrollingView.getScrollX(); int maxX = Integer.MAX_VALUE; // or some appropriate max value in your code scroller.fling(initialX, 0, initialVelocity, 0, 0, maxX, 0, 10); Log.i(TAG, "starting fling at " + initialX + ", velocity is " + initialVelocity + ""); lastX = initialX; getView().post(this); } public void run() { if (scroller.isFinished()) { Log.i(TAG, "scroller is finished, done with fling"); return; } boolean more = scroller.computeScrollOffset(); int x = scroller.getCurrX(); int diff = lastX - x; if (diff != 0) { scrollingView.scrollBy(diff, 0); lastX = x; } if (more) { getView().post(this); } } boolean isFlinging() { return !scroller.isFinished(); } void forceFinished() { if (!scroller.isFinished()) { scroller.forceFinished(true); } } }诫商
public class SimpleScrollableView extends TextView { private Scroller mScrollEventChecker; private int mLastFlingY; private float mLastY; private float mDeltaY; public SimpleScrollableView(Context context) { this(context, null, 0); } public SimpleScrollableView(Context context, AttributeSet attrs) { this(context, attrs, 0); } public SimpleScrollableView(Context context, AttributeSet attrs, int defStyleAttr) { super(context, attrs, defStyleAttr); } @Override public boolean onTouchEvent(MotionEvent event) { if (mScrollEventChecker != null && !mScrollEventChecker.isFinished()) { return super.onTouchEvent(event); } final int action = event.getAction(); switch (action) { case MotionEvent.ACTION_DOWN: mLastY = event.getY(); return true; case MotionEvent.ACTION_MOVE: int movingDelta = (int) (event.getY() - mLastY); mDeltaY += movingDelta; offsetTopAndBottom(movingDelta); invalidate(); return true; case MotionEvent.ACTION_UP: mScrollEventChecker = new Scroller(getContext()); mScrollEventChecker.startScroll(0, 0, 0, (int) -mDeltaY, 1000); post(new Runnable() { @Override public void run() { if (mScrollEventChecker.computeScrollOffset()) { int curY = mScrollEventChecker.getCurrY(); int delta = curY - mLastFlingY; offsetTopAndBottom(delta); // this is the method make this view move invalidate(); mLastFlingY = curY; post(this); } else { mLastFlingY = 0; mDeltaY = 0; } } }); return super.onTouchEvent(event); } return super.onTouchEvent(event); } }浩挎
类，然后拦截相应的动画启动方法来标记已启动的，在computeScrollOffset（）返回false后表示动画结束的值，我们通过监听器通知调用者：public class ScrollerImpl extends Scroller { ...Constructor... private boolean mIsStarted; private OnFinishListener mOnFinishListener; @Override public boolean computeScrollOffset() { boolean result = super.computeScrollOffset(); if (!result && mIsStarted) { try { // Don't let any exception impact the scroll animation. mOnFinishListener.onFinish(); } catch (Exception e) {} mIsStarted = false; } return result; } @Override public void startScroll(int startX, int startY, int dx, int dy) { super.startScroll(startX, startY, dx, dy); mIsStarted = true; } @Override public void startScroll(int startX, int startY, int dx, int dy, int duration) { super.startScroll(startX, startY, dx, dy, duration); mIsStarted = true; } @Override public void fling(int startX, int startY, int velocityX, int velocityY, int minX, int maxX, int minY, int maxY) { super.fling(startX, startY, velocityX, velocityY, minX, maxX, minY, maxY); mIsStarted = true; } public void setOnFinishListener(OnFinishListener onFinishListener) { mOnFinishListener = onFinishListener; } public static interface OnFinishListener { void onFinish(); } }博沮富教全