Example usage for android.view VelocityTracker computeCurrentVelocity

Introduction

In this page you can find the example usage for android.view VelocityTracker computeCurrentVelocity.

Prototype

public void computeCurrentVelocity(int units) 

Source Link

Document

Equivalent to invoking #computeCurrentVelocity(int,float) with a maximum velocity of Float.MAX_VALUE.

Usage

From source file:org.kymjs.kjframe.widget.KJViewPager.java

@Override
public boolean onTouchEvent(MotionEvent event) {
    if (!isScroll) {
        return false;
    }//  w  w w.  j av a  2  s. c  o m
    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }
    mVelocityTracker.addMovement(event);
    final int action = event.getAction();
    final float x = event.getX();
    final float y = event.getY();
    switch (action) {
    case MotionEvent.ACTION_DOWN:
        if (!mScroller.isFinished()) {
            mScroller.abortAnimation();
        }
        mLastMotionX = x;
        mLastMotionY = y;
        break;
    case MotionEvent.ACTION_MOVE:
        int deltaX = (int) (mLastMotionX - x);
        int deltaY = (int) (mLastMotionY - y);
        if (Math.abs(deltaX) < 200 && Math.abs(deltaY) > 10)
            break;
        mLastMotionY = y;
        mLastMotionX = x;
        scrollBy(deltaX, 0);
        break;
    case MotionEvent.ACTION_UP:
        // if (mTouchState == TOUCH_STATE_SCROLLING) {
        final VelocityTracker velocityTracker = mVelocityTracker;
        velocityTracker.computeCurrentVelocity(1000);
        int velocityX = (int) velocityTracker.getXVelocity();
        if (velocityX > SNAP_VELOCITY && mCurScreen > 0) {
            // Fling enough to move left
            snapToScreen(mCurScreen - 1);
        } else if (velocityX < -SNAP_VELOCITY && mCurScreen < getChildCount() - 1) {
            // Fling enough to move right
            snapToScreen(mCurScreen + 1);
        } else {
            snapToDestination();
        }
        if (mVelocityTracker != null) {
            mVelocityTracker.recycle();
            mVelocityTracker = null;
        }
        mTouchState = TOUCH_STATE_REST;
        break;
    case MotionEvent.ACTION_CANCEL:
        mTouchState = TOUCH_STATE_REST;
        break;
    }
    return true;
}

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From source file:cn.ieclipse.af.view.ScrollLayout.java

@Override
public boolean onTouchEvent(MotionEvent event) {

    if (mVelocityTracker == null) {
        mVelocityTracker = VelocityTracker.obtain();
    }/*from   w w  w.  ja v a 2s  .  c  o  m*/
    mVelocityTracker.addMovement(event);

    final int action = event.getAction();
    final float x = event.getX();
    final float y = event.getY();

    switch (action) {
    case MotionEvent.ACTION_DOWN:
        if (debug) {
            Log.v(TAG, "event down!");
        }
        if (!mScroller.isFinished()) {
            mScroller.abortAnimation();
        }
        mLastMotionX = x;
        break;

    case MotionEvent.ACTION_MOVE:
        int deltaX = (int) (mLastMotionX - x);
        mLastMotionX = x;

        scrollBy(deltaX, 0);
        break;

    case MotionEvent.ACTION_UP:
        if (debug) {
            Log.v(TAG, "event : up");
        }
        // if (mTouchState == TOUCH_STATE_SCROLLING) {
        final VelocityTracker velocityTracker = mVelocityTracker;
        velocityTracker.computeCurrentVelocity(1000);
        int velocityX = (int) velocityTracker.getXVelocity();
        if (debug) {
            Log.v(TAG, "velocityX:" + velocityX);
        }

        if (velocityX > mSnapVelocity) {
            if (mCurScreen > 0) {
                // Fling enough to move left
                if (debug) {
                    Log.v(TAG, "snap left");
                }
                snapToScreen(mCurScreen - 1);
            } else {
                // TODO
                disableWipe(false);
                snapToDestination();
            }
        } else if (velocityX < -mSnapVelocity) {
            if (mCurScreen < getChildCount() - 1) {
                // Fling enough to move right
                if (debug) {
                    Log.v(TAG, "snap right");
                }
                snapToScreen(mCurScreen + 1);
            } else {
                // TODO
                disableWipe(false);
                snapToDestination();
            }
        } else {
            snapToDestination();
        }

        if (mVelocityTracker != null) {
            mVelocityTracker.recycle();
            mVelocityTracker = null;
        }
        // }
        mTouchState = TOUCH_STATE_REST;
        break;
    case MotionEvent.ACTION_CANCEL:
        mTouchState = TOUCH_STATE_REST;
        break;
    }

    return true;
}

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From source file:org.zywx.wbpalmstar.engine.EBounceView.java

private boolean handlerTracker() {
    final VelocityTracker velocityTracker = mVelocityTracker;
    velocityTracker.computeCurrentVelocity(1000);
    int velocityX = (int) (velocityTracker.getXVelocity() / mDensity);
    int velocityY = (int) (velocityTracker.getYVelocity() / mDensity);
    endDrag();//from  ww  w . j  a  v a 2s . co  m
    return onTracker(velocityX, velocityY);
}

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From source file:jmri.enginedriver.throttle.java

public void gestureMove(MotionEvent event) {
    // Log.d("Engine_Driver", "gestureMove action " + event.getAction());
    if (gestureInProgress) {
        // stop the gesture timeout timer
        mainapp.throttle_msg_handler.removeCallbacks(gestureStopped);

        mVelocityTracker.addMovement(event);
        if ((event.getEventTime() - gestureLastCheckTime) > gestureCheckRate) {
            // monitor velocity and fail gesture if it is too low
            gestureLastCheckTime = event.getEventTime();
            final VelocityTracker velocityTracker = mVelocityTracker;
            velocityTracker.computeCurrentVelocity(1000);
            int velocityX = (int) velocityTracker.getXVelocity();
            int velocityY = (int) velocityTracker.getYVelocity();
            // Log.d("Engine_Driver", "gestureVelocity vel " + velocityX);
            if ((Math.abs(velocityX) < threaded_application.min_fling_velocity)
                    && (Math.abs(velocityY) < threaded_application.min_fling_velocity)) {
                gestureFailed(event);//  w  w w. j  a  v a  2s  .c o  m
            }
        }
        if (gestureInProgress) {
            // restart the gesture timeout timer
            mainapp.throttle_msg_handler.postDelayed(gestureStopped, gestureCheckRate);
        }
    }
}

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