Example usage for android.support.v4.view ViewCompat canScrollVertically

Introduction

In this page you can find the example usage for android.support.v4.view ViewCompat canScrollVertically.

Prototype

public static boolean canScrollVertically(View v, int direction) 

Source Link

Document

Check if this view can be scrolled vertically in a certain direction.

Usage

From source file:com.peerless2012.twowaynestedscrollview.TwoWayNestedScrollView.java

@Override
public boolean onInterceptTouchEvent(MotionEvent ev) {
    /*//ww w.j  a va2  s .  c  om
     * 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;
    }

    /*
     * Don't try to intercept touch if we can't scroll anyway.
     */
    if (getScrollY() == 0 && !ViewCompat.canScrollVertically(this, 1)) {
        return false;
    }

    switch (action & MotionEventCompat.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 = MotionEventCompat.findPointerIndex(ev, activePointerId);
        if (pointerIndex == -1) {
            Log.e(TAG, "Invalid pointerId=" + activePointerId + " in onInterceptTouchEvent");
            break;
        }

        final int x = (int) MotionEventCompat.getX(ev, pointerIndex);
        final int xDiff = Math.abs(x - mLastMotionX);
        final int y = (int) MotionEventCompat.getY(ev, pointerIndex);
        final int yDiff = Math.abs(y - mLastMotionY);

        if (yDiff > mTouchSlop && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_VERTICAL) == 0) {
            mIsBeingDragged = true;
            mLastMotionY = y;
            initVelocityTrackerIfNotExists();
            mVelocityTracker.addMovement(ev);
            mNestedYOffset = 0;
            final ViewParent parent = getParent();
            if (parent != null) {
                parent.requestDisallowInterceptTouchEvent(true);
            }
        } else if (xDiff > mTouchSlop && (getNestedScrollAxes() & ViewCompat.SCROLL_AXIS_VERTICAL) == 0) {
            mIsBeingDragged = true;
            mLastMotionX = x;
            initVelocityTrackerIfNotExists();
            mVelocityTracker.addMovement(ev);
            mNestedXOffset = 0;
            final ViewParent parent = getParent();
            if (parent != null) {
                parent.requestDisallowInterceptTouchEvent(true);
            }
        }
        break;
    }

    case MotionEvent.ACTION_DOWN: {
        final int y = (int) ev.getY();
        final int x = (int) ev.getX();
        if (!inChild(x, y)) {
            mIsBeingDragged = false;
            scrollDirection = DIRECTION_INVALIDATE;
            recycleVelocityTracker();
            break;
        }

        /*
         * Remember location of down touch. ACTION_DOWN always refers to
         * pointer index 0.
         */
        mLastMotionY = y;
        mLastMotionX = x;
        mActivePointerId = MotionEventCompat.getPointerId(ev, 0);

        initOrResetVelocityTracker();
        mVelocityTracker.addMovement(ev);
        /*
         * If being flinged and user touches the screen, initiate drag;
         * otherwise don't. mScroller.isFinished should be false when being
         * flinged.
         */
        mIsBeingDragged = !mScroller.isFinished();
        startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL);
        break;
    }

    case MotionEvent.ACTION_CANCEL:
    case MotionEvent.ACTION_UP:
        /* Release the drag */
        mIsBeingDragged = false;
        mActivePointerId = INVALID_POINTER;
        recycleVelocityTracker();
        stopNestedScroll();
        break;
    case MotionEventCompat.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;
}

---

From source file:bhav.swipeaction.SwipeAction.java

/**
 * @return Whether it is possible for the child view of this layout to
 * scroll up. Override this if the child view is a custom view.
 *//*  w w w.  j  av a 2  s. co m*/
public boolean canChildScrollUp() {
    return ViewCompat.canScrollVertically(mTarget, -1);
}

---

From source file:com.dystu.toolbar.widget.MySwipeRefreshLayout.java

/**
 * @return Whether it is possible for the child view of this layout to
 *         scroll up. Override this if the child view is a custom view.
 *///ww w .  j  a v a  2s.com
public boolean canChildScrollUp() {
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            return absListView.getChildCount() > 0 && (absListView.getFirstVisiblePosition() > 0
                    || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
        } else {
            //Log.d(TAG, "canChildScrollUp :"+ mTarget.getScrollY()+" "+mTarget);
            boolean flag = mTarget.getScrollY() > 0;
            if (mTarget instanceof RecyclerView) {
                RecyclerView rv = (RecyclerView) mTarget;
                int firstVisiblePosition = rv.getChildPosition(rv.getChildAt(0));
                if (firstVisiblePosition == 0)
                    return rv.getChildAt(0).getTop() == 0 ? false : true;
                else
                    return true;
            }
            return flag;//ViewCompat.canScrollVertically(mTarget, -1);
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, -1);
    }
}

---

From source file:br.com.leoleal.swipetorefresh.SwipeRefreshLayout.java

/**
 * @return Whether it is possible for the child view of this layout to
 *         scroll up. Override this if the child view is a custom view.
 *//*from   www.j  a  va2s  . c o  m*/
public boolean canChildScrollUp() {
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            return absListView.getChildCount() > 0 && (absListView.getFirstVisiblePosition() > 0
                    || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
        } else {
            return ViewCompat.canScrollVertically(mTarget, -1) || mTarget.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, -1);
    }
}

---

From source file:com.adhere.view.swipe.SwipeRefreshLayout.java

/**
 * @return Whether it is possible for the child view of this layout to
 *         scroll up. Override this if the child view is a custom view.
 *//* ww  w.  jav a 2s .c o m*/
public boolean canChildScrollUp() {
    //        //For make it can work when my recycler view is in Gone.
    //        return false;
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            return absListView.getChildCount() > 0 && (absListView.getFirstVisiblePosition() > 0
                    || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
        } else {
            return ViewCompat.canScrollVertically(mTarget, -1) || mTarget.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, -1);
    }
}

---

From source file:com.ray.appchallenge.view.SwipeRefreshLayoutBottom.java

/**
 * @return  Whether it is possible for the child view of this layout to scroll up. Override this if the child view
 *          is a custom view./*www  . j av  a 2 s  .c  o m*/
 */
/*
 * public boolean canChildScrollUp() {
 *  if (android.os.Build.VERSION.SDK_INT < 14) {
 *      if (mTarget instanceof AbsListView) {
 *          final AbsListView absListView = (AbsListView) mTarget;
 *          return absListView.getChildCount() > 0
 *                  && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0)
 *                          .getTop() < absListView.getPaddingTop());
 *      } else {
 *          return mTarget.getScrollY() > 0;
 *      }
 *  } else {
 *      return ViewCompat.canScrollVertically(mTarget, -1);
 *  }
 *}*/

public boolean canChildScrollUp() {

    Log.w("ANDREY", "canChildScrollUp()");

    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;

            Log.e("ANDREY", " absListView.getFirstVisiblePosition() " + absListView.getFirstVisiblePosition());
            Log.e("ANDREY", " absListView.getLastVisiblePosition() " + absListView.getLastVisiblePosition());
            Log.e("ANDREY", " absListView.getCount() " + absListView.getCount());

            if (absListView.getLastVisiblePosition() + 1 == absListView.getCount()) {

                int lastIndex = absListView.getLastVisiblePosition() - absListView.getFirstVisiblePosition();

                Log.e("ANDREY", " lastIndex  " + lastIndex);

                boolean res = absListView.getChildAt(lastIndex).getBottom() == absListView.getPaddingBottom();

                if (!res) {
                    Log.e("ANDREY", "return " + res);
                }

                return res;

            }

            // Log.e("ANDREY", "return TRUE");
            return true;

            /*
             * return absListView.getChildCount() > 0
             *      && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0).getTop() <
             * absListView.getPaddingTop());*/

        } else {
            Log.e("ANDREY", "return 222 " + (mTarget.getScrollY() > 0));
            return mTarget.getScrollY() > 0;
        }
    } else {

        Log.e("ANDREY", "return 333 " + (ViewCompat.canScrollVertically(mTarget, 1)));

        return ViewCompat.canScrollVertically(mTarget, 1);
    }

    // return  ViewCompat.canScrollVertically(mTarget, 1);

}

---

From source file:com.com.mytoolsproject.SwipeRefreshLayout.java

/**
 * @return Whether it is possible for the child view of this layout to
 * scroll up. Override this if the child view is a custom view.
 *//*w  w  w. j  av  a2  s . c o m*/
public boolean canChildScrollUp() {
    if (mChildScrollUpCallback != null) {
        return mChildScrollUpCallback.canChildScrollUp(this, mTarget);
    }
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            return absListView.getChildCount() > 0 && (absListView.getFirstVisiblePosition() > 0
                    || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
        } else {
            return ViewCompat.canScrollVertically(mTarget, -1) || mTarget.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, -1);
    }
}

---

From source file:com.koresuniku.wishmaster.utilities.SwipeRefreshLayoutBottom.java

/**
 * @return Whether it is possible for the child view of this layout to
 * scroll up. Override this if the child view is a custom view.
 *///from w  w  w .  j av  a 2s. c o m
/*
public boolean canChildScrollUp() {
if (android.os.Build.VERSION.SDK_INT < 14) {
    if (mTarget instanceof AbsListView) {
        final AbsListView absListView = (AbsListView) mTarget;
        return absListView.getChildCount() > 0
                && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0)
                        .getTop() < absListView.getPaddingTop());
    } else {
        return mTarget.getScrollY() > 0;
    }
} else {
    return ViewCompat.canScrollVertically(mTarget, -1);
}
}*/
public boolean canChildScrollUp() {

    Log.w("ANDREY", "canChildScrollUp()");

    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;

            Log.e("ANDREY", " absListView.getFirstVisiblePosition() " + absListView.getFirstVisiblePosition());
            Log.e("ANDREY", " absListView.getLastVisiblePosition() " + absListView.getLastVisiblePosition());
            Log.e("ANDREY", " absListView.getCount() " + absListView.getCount());

            if (absListView.getLastVisiblePosition() + 1 == absListView.getCount()) {

                int lastIndex = absListView.getLastVisiblePosition() - absListView.getFirstVisiblePosition();

                Log.e("ANDREY", " lastIndex  " + lastIndex);

                boolean res = absListView.getChildAt(lastIndex).getBottom() == absListView.getPaddingBottom();

                if (!res) {
                    Log.e("ANDREY", "return " + res);
                }

                return res;

            }

            //Log.e("ANDREY", "return TRUE");
            return true;

            /*
            return absListView.getChildCount() > 0
                && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());*/

        } else {
            Log.e("ANDREY", "return 222 " + (mTarget.getScrollY() > 0));
            return mTarget.getScrollY() > 0;
        }
    } else {

        Log.e("ANDREY", "return 333 " + (ViewCompat.canScrollVertically(mTarget, 1)));

        return ViewCompat.canScrollVertically(mTarget, 1);
    }

    //return  ViewCompat.canScrollVertically(mTarget, 1);

}

---

From source file:android.kectech.com.stylingactionbar.lib.SwipyRefreshLayout.java

/**
 * @return Whether it is possible for the child view of this layout to
 * scroll up. Override this if the child view is a custom view.
 *//*from  w  w w .  j  a va 2s  . c  om*/
public boolean canChildScrollUp() {
    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;
            return absListView.getChildCount() > 0 && (absListView.getFirstVisiblePosition() > 0
                    || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());
        } else {
            return mTarget.getScrollY() > 0;
        }
    } else {
        return ViewCompat.canScrollVertically(mTarget, -1);
    }
}

---

From source file:anabolicandroids.chanobol.util.swipebottom.SwipeRefreshLayoutBottom.java

/**
 * @return Whether it is possible for the child view of this layout to
 *         scroll up. Override this if the child view is a custom view.
 *//*from  w ww .  jav a  2s  . c om*/
/*
public boolean canChildScrollUp() {
if (android.os.Build.VERSION.SDK_INT < 14) {
    if (mTarget instanceof AbsListView) {
        final AbsListView absListView = (AbsListView) mTarget;
        return absListView.getChildCount() > 0
                && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0)
                        .getTop() < absListView.getPaddingTop());
    } else {
        return mTarget.getScrollY() > 0;
    }
} else {
    return ViewCompat.canScrollVertically(mTarget, -1);
}
}*/

public boolean canChildScrollUp() {

    Log.w("ANDREY", "canChildScrollUp()");

    if (android.os.Build.VERSION.SDK_INT < 14) {
        if (mTarget instanceof AbsListView) {
            final AbsListView absListView = (AbsListView) mTarget;

            Log.e("ANDREY", " absListView.getFirstVisiblePosition() " + absListView.getFirstVisiblePosition());
            Log.e("ANDREY", " absListView.getLastVisiblePosition() " + absListView.getLastVisiblePosition());
            Log.e("ANDREY", " absListView.getCount() " + absListView.getCount());

            if (absListView.getLastVisiblePosition() + 1 == absListView.getCount()) {

                int lastIndex = absListView.getLastVisiblePosition() - absListView.getFirstVisiblePosition();

                Log.e("ANDREY", " lastIndex  " + lastIndex);

                boolean res = absListView.getChildAt(lastIndex).getBottom() == absListView.getPaddingBottom();

                if (!res) {
                    Log.e("ANDREY", "return " + res);
                }

                return res;

            }

            //Log.e("ANDREY", "return TRUE");
            return true;

            /*
            return absListView.getChildCount() > 0
                && (absListView.getFirstVisiblePosition() > 0 || absListView.getChildAt(0).getTop() < absListView.getPaddingTop());*/

        } else {
            Log.e("ANDREY", "return 222 " + (mTarget.getScrollY() > 0));
            return mTarget.getScrollY() > 0;
        }
    } else {

        Log.e("ANDREY", "return 333 " + (ViewCompat.canScrollVertically(mTarget, 1)));

        return ViewCompat.canScrollVertically(mTarget, 1);
    }

    //return  ViewCompat.canScrollVertically(mTarget, 1);

}

---

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