我已经尝试了好几次，但我无法解决。 我有一个包含多个视图的ScrollView，它们由ObjectAnimator移动。当您按下一个按钮时，视图会在给定时间内垂直移动。 我玩PLAY和PAUSE，但是当我用手指移动滚动时，我无法知道滚动被移动的像素数。
我想用我的手指移动滚动，脉冲播放，我希望滚动开始滚动我放的地方，而不是从头开始。 我试过这个：
view.setOnTouchListener(new OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
//Choose which motion action has been performed
switch(event.getAction())
{
case MotionEvent.ACTION_DOWN:
//Get X, Y coordinates from the ImageView
X = (int) event.getX();
Y = (int) event.getY();
startX = event.getRawX();
startY = event.getRawY();
break;
case MotionEvent.ACTION_MOVE:
Z = (int) event.getX();
S = (int) event.getY();
K = (int) event.getRawX();
P = (int) event.getRawY();
V = (int) (event.getRawY() - startY);
break;
case MotionEvent.ACTION_UP:
A = (int) event.getX();
E = (int) event.getY();
break;
}
return true;
}
}）;
抬起手指时没有给出坐标。我怎么知道移动滚动时移动的像素数？这是一个Android应用程序。 提前谢谢！
答案 0 :(得分：2)
每次获得ACTION_MOVE事件时，您只需计算x和y坐标之间的差异。尝试这样的事情：
public abstract class ScrollTouchListener implements View.OnTouchListener {
private double x = 0;
private double y = 0;
@Override
public boolean onTouch(View view, MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
// User started scrolling
x = event.getX();
y = event.getY();
onScrollStarted(x, y);
return true;
case MotionEvent.ACTION_UP:
// User stopped scrolling
x = event.getX();
y = event.getY();
onScrollEnded(x, y);
return true;
case MotionEvent.ACTION_MOVE:
// Finger was moved get new x and y coordinates
// and calculate the difference
double newX = event.getX();
double newY = event.getY();
double difX = x - newX;
double difY = y - newY;
onScroll(difX, difY);
x = newX;
y = newY;
return true;
default:
return false;
}
}
protected abstract void onScrollStarted(double x, double y);
protected abstract void onScroll(double deltaX, double deltaY);
protected abstract void onScrollEnded(double x, double y);
}
你可以像这样使用它：
scrollView.setOnTouchListener(new ScrollTouchListener() {
@Override
protected void onScrollStarted(double x, double y) {
// Called when you start scrolling.
// x and y are the coordinates where the user started scrolling.
}
@Override
protected void onScroll(double deltaX, double deltaY) {
// Called while scrolling.
// deltaX and deltaY tell you how much the finger was moved.
}
@Override
protected void onScrollEnded(double x, double y) {
// Called when you stop scrolling.
// x and y are the coordinates where the user stopped scrolling.
}
});
答案 1 :(得分：1)
有我的解决方案，完美运行，尝试阅读代码
public class CustomScrollView extends NestedScrollView
{
private boolean mIsScrolling;
private boolean mIsTouching;
private OnScrollListener mOnScrollListener;
private Runnable mScrollingRunnable;
public interface OnScrollListener
{
void onScrollChanged(CustomScrollView scrollView, int x, int y, int oldX, int oldY);
void onEndScroll(CustomScrollView scrollView);
void onGoUp();
void onGoDown();
}
public CustomScrollView(final Context context)
{
super(context);
}
public CustomScrollView(final Context context, final AttributeSet attrs)
{
super(context, attrs);
}
public CustomScrollView(final Context context, final AttributeSet attrs, final int defStyleAttr)
{
super(context, attrs, defStyleAttr);
}
private int y = 0;
@Override
public boolean dispatchTouchEvent(MotionEvent iEv)
{
if (isEnabled())
{
processEvent(iEv);
super.dispatchTouchEvent(iEv);
return true; //to keep receive event that follow down event
}
return super.dispatchTouchEvent(iEv);
}
private void processEvent(final MotionEvent iEv)
{
switch (iEv.getAction())
{
case MotionEvent.ACTION_DOWN:
y = (int) iEv.getY();
break;
case MotionEvent.ACTION_UP:
y = (int) iEv.getY();
if (mIsTouching && !mIsScrolling)
{
if (mOnScrollListener != null)
{
//If you need to know when end of scrolling just uncomment
mOnScrollListener.onEndScroll(this);
}
}
mIsTouching = false;
break;
case MotionEvent.ACTION_MOVE:
mIsTouching = true;
mIsScrolling = true;
int newY = (int) iEv.getY();
int difY = y - newY;
int MAX_VALUE = 200;
int MIN_VALUE = -200;
if (difY > MAX_VALUE)
{
AppUtils.printLog(Log.ERROR, "TAG", "difY down : " + difY + " , y : " + y + ", newY : " + newY);
if (mOnScrollListener != null)
{
mOnScrollListener.onGoDown();
}
y = newY;
}
else if (difY < MIN_VALUE)
{
AppUtils.printLog(Log.ERROR, "TAG", "difY up : " + difY + " , y : " + y + ", newY : " + newY);
if (mOnScrollListener != null)
{
mOnScrollListener.onGoUp();
}
y = newY;
}
break;
}
}
@Override
protected void onScrollChanged(int iX, int iY, int iOldX, int iOldY)
{
super.onScrollChanged(iX, iY, iOldX, iOldY);
if (Math.abs(iOldX - iX) > 0)
{
if (mScrollingRunnable != null)
{
removeCallbacks(mScrollingRunnable);
}
mScrollingRunnable = new Runnable()
{
public void run()
{
if (mIsScrolling && !mIsTouching)
{
if (mOnScrollListener != null)
{
mOnScrollListener.onEndScroll(CustomScrollView.this);
}
}
mIsScrolling = false;
mScrollingRunnable = null;
}
};
postDelayed(mScrollingRunnable, 200);
}
if (mOnScrollListener != null)
{
mOnScrollListener.onScrollChanged(this, iX, iY, iOldX, iOldY);
}
}
public OnScrollListener getOnScrollListener()
{
return mOnScrollListener;
}
public void setOnScrollListener(OnScrollListener mOnEndScrollListener)
{
this.mOnScrollListener = mOnEndScrollListener;
}
}
用法：只需在XML中添加此自定义视图
即可<ui.customWidgets.CustomScrollView
android:id="@+id/scroll_frag_detail"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:overScrollMode="never"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:scrollbars="none"
app:behavior_overlapTop="192dp"
app:layout_behavior="@string/appbar_scrolling_view_behavior">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<!--Your code here-->
</LinearLayout>
</ui.customWidgets.CustomScrollView>
代码
mScrollView.setOnScrollListener(new CustomScrollView.OnScrollListener()
{
@Override
public void onScrollChanged(final CustomScrollView scrollView, final int x, final int y, final int oldX, final int oldY)
{
}
@Override
public void onEndScroll(final CustomScrollView scrollView)
{
}
@Override
public void onGoUp()
{
}
@Override
public void onGoDown()
{
}
});